Im taking my first steps in developing for android. Following a tutorial i have created a button, textview,edit text, and am now trying to implimetn a list view.
i have followed the tutorial Exactly, and for some reason, when i implement the Tableview, my button and image disappear.
can anybody find out why?
.java:
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.TextView;
import java.util.ArrayList;
public class MainActivity extends ActionBarActivity implements View.OnClickListener {
TextView mainTextView;
Button mainButton;
EditText mainEditText;
ListView mainListView;
ArrayAdapter mArrayAdapter;
ArrayList mNameList = new ArrayList();
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//access the textview defined in Layout XML & set its value
mainTextView = (TextView) findViewById(R.id.main_textview);
mainTextView.setText("set In Java!");
//access the button defined in layout XML
mainButton = (Button) findViewById(R.id.main_button);
mainButton.setOnClickListener(this);
mainEditText = (EditText) findViewById(R.id.main_edittext);
mainListView = (ListView)findViewById(R.id.main_listview);
mArrayAdapter = new ArrayAdapter(this, android.R.layout.simple_list_item_1,mNameList);
mainListView.setAdapter(mArrayAdapter);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
#Override
public void onClick(View v) {
mainTextView.setText(mainEditText.getText().toString() + " is learning Android Development");
mNameList.add(mainEditText.getText().toString());
mArrayAdapter.notifyDataSetChanged();
}
}
activity.XML:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<TextView
android:id="#+id/main_textview"
android:layout_marginLeft="20dp"
android:layout_marginTop="20dp"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/textview"/>
<EditText
android:id="#+id/main_edittext"
android:layout_marginLeft="20dp"
android:layout_marginTop="20dp"
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:hint="#string/hint"/>
<ListView
android:id="#+id/main_listview"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:layout_marginTop="20dp"/>
</LinearLayout>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal">
<!-- set OnClickListener to trigger results when pressed -->
<Button
android:id="#+id/main_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="20dp"
android:layout_marginTop="20dp"
android:text="#string/button"/>
<!--shows an image from your drawable rescources-->
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="20dp"
android:layout_marginLeft="20dp"
android:src="#drawable/ic_launcher"/>
</LinearLayout>
</LinearLayout>
Try this way,hope this will help you to solve your problem.
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:gravity="center">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:id="#+id/main_textview"
android:layout_marginLeft="20dp"
android:layout_marginTop="20dp"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/textview"/>
<EditText
android:id="#+id/main_edittext"
android:layout_marginLeft="20dp"
android:layout_marginTop="20dp"
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:hint="#string/hint"/>
</LinearLayout>
<ListView
android:id="#+id/main_listview"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:layout_marginTop="20dp"/>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<Button
android:id="#+id/main_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="20dp"
android:layout_marginTop="20dp"
android:text="#string/button"/>
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="20dp"
android:layout_marginLeft="20dp"
android:src="#drawable/ic_launcher"/>
</LinearLayout>
</LinearLayout>
Try this..
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<TextView
android:id="#+id/main_textview"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="20dp"
android:layout_marginTop="20dp"
android:text="textview" />
<EditText
android:id="#+id/main_edittext"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="20dp"
android:layout_marginTop="20dp"
android:hint="hint" />
</LinearLayout>
<ListView
android:id="#+id/main_listview"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_marginTop="20dp"
android:layout_weight="1" />
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<!-- set OnClickListener to trigger results when pressed -->
<Button
android:id="#+id/main_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="20dp"
android:layout_marginTop="20dp"
android:text="button" />
<!-- shows an image from your drawable rescources -->
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="20dp"
android:layout_marginTop="20dp"
android:src="#drawable/ic_launcher" />
</LinearLayout>
</LinearLayout>
LinearLayout is horizontal by default.
Your ListView is layout_width="match_parent" and root LinearLayout is horizontal.
so ListView Expands wide, ImageView and etc have pushed out and become invisible.
I recommend you to always specify android:orientation ("vertical" or "horizontal") in LinearLayout.
Related
I created an app that adds forms dynamically when a user clicks the add butting and deletes it when he clicks the cancel button. I have two cancel buttons, one in the Field.xml file and the other in the activity_school_search_setup file.
They both have the same ID but the one in the Field.xml file does not delete the field. It appears as though the onclicklistener does not function for the delete button.
Main Java class file
import android.content.Context;
import android.graphics.Color;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.view.View;
import android.widget.Toast;
public class SchoolSearchSetup extends AppCompatActivity implements View.OnClickListener {
private EditText searchSchoolID;
private Button searchSchoolButtonID;
private ListView listOfSchoolsID;
private Button openNewschoolID;
private LinearLayout schoolSetupLayout;
private Button addNewClass;
private EditText classNameEditText;
private Button deleteButton;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_school_search_setup);
findAllViewsID();
initializeListenners();
}
public void findAllViewsID(){
classNameEditText = findViewById(R.id.classNameText);
addNewClass = findViewById(R.id.addNewClassButton);
schoolSetupLayout = findViewById(R.id.schoolSetupLayout);
searchSchoolID = findViewById(R.id.searchSchoolID);
searchSchoolButtonID = findViewById(R.id.searchSchoolButtonID);
listOfSchoolsID = findViewById(R.id.listOfSchoolsID);
openNewschoolID = findViewById(R.id.openNewschoolID);
deleteButton = findViewById(R.id.delete_button);
}
public void initializeListenners(){
openNewschoolID.setOnClickListener(SchoolSearchSetup.this);
addNewClass.setOnClickListener(SchoolSearchSetup.this);
deleteButton.setOnClickListener(SchoolSearchSetup.this);
}
public void addNewClass(){
LayoutInflater inflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View rowView = inflater.inflate(R.layout.field, null);
schoolSetupLayout.addView(rowView, schoolSetupLayout.getChildCount() -1);
}
#Override
public void onClick(View view) {
switch(view.getId()){
case R.id.openNewschoolID:
displaySchoolSetUpForms();
break;
case R.id.addNewClassButton:
addNewClass();
break;
case R.id.delete_button:
schoolSetupLayout.removeView((View) view.getParent());
}
}
private void displaySchoolSetUpForms() {
schoolSetupLayout.setVisibility(View.VISIBLE);
}
}
Here is the main XML activity file
activity.school_search_setup.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="wrap_content"
tools:context="com.example.demeainc.demea.MainActivity"
android:orientation="vertical"
android:background="#color/backgroundColor">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="20dp">
<ImageView
android:id="#+id/backArrowClassView"
android:layout_width="30dp"
android:layout_height="30dp"
android:src="#drawable/ic_arrow_class"
android:layout_marginLeft="5dp"/>
</LinearLayout>
<ScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fillViewport="true">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="10dp"
android:layout_marginLeft="50dp"
android:text="Search your school."
android:gravity="center"
android:textSize="25dp" />
<android.support.v7.widget.CardView
android:foreground="?attr/selectableItemBackground"
android:clickable="true"
android:layout_width="300dp"
android:layout_height="wrap_content"
android:layout_marginLeft="10dp"
android:layout_marginTop="5dp">
<EditText
android:id="#+id/searchSchoolID"
android:layout_width="270dp"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:drawableLeft="#drawable/ic_search_black_24dp"
android:hint="Search"/>
</android.support.v7.widget.CardView>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:layout_marginTop="20dp">
<Button
android:id="#+id/searchSchoolButtonID"
android:layout_width="200dp"
android:layout_height="60dp"
android:layout_marginLeft="60dp"
android:text="Search"
android:textColor="#ffff"
android:background="#color/colorPrimary"
android:textStyle="bold"/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="20dp"
android:layout_marginLeft="10dp">
<android.support.v7.widget.CardView
android:layout_width="300dp"
android:layout_height="wrap_content">
<ListView
android:id="#+id/listOfSchoolsID"
android:layout_width="match_parent"
android:layout_height="80dp"
android:background="#android:color/transparent"
android:cacheColorHint="#color/ligtherDarkGrey"
android:divider="#CCCCCC"
android:dividerHeight="2dp"
android:paddingLeft="2dp" >
</ListView>
</android.support.v7.widget.CardView>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="20dp"
android:orientation="vertical">
<Button
android:id="#+id/openNewschoolID"
android:layout_width="200dp"
android:layout_height="60dp"
android:layout_marginLeft="60dp"
android:background="#color/colorPrimary"
android:text="Open New School"
android:textColor="#ffff"
android:textStyle="bold" />
</LinearLayout>
<LinearLayout
android:id="#+id/schoolSetupLayout"
android:visibility="invisible"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="5dp"
android:orientation="vertical">
<TextView
android:id="#+id/schoolSetupText"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="School Setup"
android:textSize="20dp"
android:layout_marginLeft="50dp"/>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<EditText
android:id="#+id/classNameText"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="5"
android:hint="Class name, e.g Grade one" />
<Button
android:id="#+id/delete_button"
android:layout_width="0dp"
android:layout_height="40dp"
android:layout_weight="1"
android:background="#android:drawable/ic_delete"/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:layout_gravity="center">
<Button
android:id="#+id/addNewClassButton"
android:layout_marginTop="15dp"
android:layout_marginLeft="50dp"
android:layout_width="100dp"
android:layout_height="50dp"
android:text="Add new class"
android:textColor="#ffff"
android:background="#color/colorPrimary"/>
<Button
android:id="#+id/nextButton"
android:layout_marginTop="25dp"
android:layout_marginLeft="8dp"
android:layout_width="100dp"
android:layout_height="50dp"
android:text="Next"
android:textColor="#ffff"
android:background="#color/green"/>
</LinearLayout>
</LinearLayout>
</LinearLayout>
</ScrollView>
</LinearLayout>
Here is the field.xml file
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/schoolSetupLayout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="5dp"
android:orientation="vertical">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<EditText
android:id="#+id/classNameText"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="5"
android:hint="Class name, e.g Grade one" />
<Button
android:id="#+id/delete_button"
android:layout_width="0dp"
android:layout_height="40dp"
android:layout_weight="1"
android:background="#android:drawable/ic_delete"/>
</LinearLayout>
</LinearLayout>
You either should add a clickListener on
View rowView = inflater.inflate(R.layout.field, null);
Or add android:onClick within an element of field.xml if you want some click event to happen on it.
initializeListenners(); is only called once, during the initial layout, not on dynamic view additions.
Implement OnClickListener for Field.xml button after you inflate that layout.
Here is example:
public void addNewClass(){
LayoutInflater inflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View rowView = inflater.inflate(R.layout.field, null);
final Button btnDelete = rowView.findViewById(R.id.delete_button);
btnDelete.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// Your stuff
}
});
schoolSetupLayout.addView(rowView, schoolSetupLayout.getChildCount() -1);
}
Hope that help :)
I created an app that dynamically adds an edittext field to the view by clicking an Add button and deletes it by clicking a delete button. I created a separate xml file called field.xml that is called up when a new edittext field is added to the view. But the delete button does not remove this edittext field when clicked. What am I missing in the code I have tried most options but to no avail.
Here is the main java file
SchoolSearchSetup.java
import android.content.Context;
import android.graphics.Color;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.view.View;
import android.widget.Toast;
public class SchoolSearchSetup extends AppCompatActivity implements View.OnClickListener {
private EditText searchSchoolID;
private Button searchSchoolButtonID;
private ListView listOfSchoolsID;
private Button openNewschoolID;
private LinearLayout schoolSetupLayout;
private Button addNewClass;
private EditText classNameEditText;
private Button deleteButton;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_school_search_setup);
findAllViewsID();
initializeListenners();
}
public void findAllViewsID(){
classNameEditText = findViewById(R.id.classNameText);
addNewClass = findViewById(R.id.addNewClassButton);
schoolSetupLayout = findViewById(R.id.schoolSetupLayout);
searchSchoolID = findViewById(R.id.searchSchoolID);
searchSchoolButtonID = findViewById(R.id.searchSchoolButtonID);
listOfSchoolsID = findViewById(R.id.listOfSchoolsID);
openNewschoolID = findViewById(R.id.openNewschoolID);
deleteButton = findViewById(R.id.delete_button);
}
public void initializeListenners(){
openNewschoolID.setOnClickListener(SchoolSearchSetup.this);
addNewClass.setOnClickListener(SchoolSearchSetup.this);
deleteButton.setOnClickListener(SchoolSearchSetup.this);
}
public void addNewClass(){
LayoutInflater inflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View rowView = inflater.inflate(R.layout.field, null);
schoolSetupLayout.addView(rowView, schoolSetupLayout.getChildCount() -1);
}
#Override
public void onClick(View view) {
switch(view.getId()){
case R.id.openNewschoolID:
displaySchoolSetUpForms();
break;
case R.id.addNewClassButton:
addNewClass();
break;
case R.id.delete_button:
schoolSetupLayout.removeView((View) view.getParent());
}
}
private void displaySchoolSetUpForms() {
schoolSetupLayout.setVisibility(View.VISIBLE);
}
}
The main XML file
activity.school_search_setup.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="wrap_content"
tools:context="com.example.demeainc.demea.MainActivity"
android:orientation="vertical"
android:background="#color/backgroundColor">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="20dp">
<ImageView
android:id="#+id/backArrowClassView"
android:layout_width="30dp"
android:layout_height="30dp"
android:src="#drawable/ic_arrow_class"
android:layout_marginLeft="5dp"/>
</LinearLayout>
<ScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fillViewport="true">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="10dp"
android:layout_marginLeft="50dp"
android:text="Search your school."
android:gravity="center"
android:textSize="25dp" />
<android.support.v7.widget.CardView
android:foreground="?attr/selectableItemBackground"
android:clickable="true"
android:layout_width="300dp"
android:layout_height="wrap_content"
android:layout_marginLeft="10dp"
android:layout_marginTop="5dp">
<EditText
android:id="#+id/searchSchoolID"
android:layout_width="270dp"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:drawableLeft="#drawable/ic_search_black_24dp"
android:hint="Search"/>
</android.support.v7.widget.CardView>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:layout_marginTop="20dp">
<Button
android:id="#+id/searchSchoolButtonID"
android:layout_width="200dp"
android:layout_height="60dp"
android:layout_marginLeft="60dp"
android:text="Search"
android:textColor="#ffff"
android:background="#color/colorPrimary"
android:textStyle="bold"/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="20dp"
android:layout_marginLeft="10dp">
<android.support.v7.widget.CardView
android:layout_width="300dp"
android:layout_height="wrap_content">
<ListView
android:id="#+id/listOfSchoolsID"
android:layout_width="match_parent"
android:layout_height="80dp"
android:background="#android:color/transparent"
android:cacheColorHint="#color/ligtherDarkGrey"
android:divider="#CCCCCC"
android:dividerHeight="2dp"
android:paddingLeft="2dp" >
</ListView>
</android.support.v7.widget.CardView>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="20dp"
android:orientation="vertical">
<Button
android:id="#+id/openNewschoolID"
android:layout_width="200dp"
android:layout_height="60dp"
android:layout_marginLeft="60dp"
android:background="#color/colorPrimary"
android:text="Open New School"
android:textColor="#ffff"
android:textStyle="bold" />
</LinearLayout>
<LinearLayout
android:id="#+id/schoolSetupLayout"
android:visibility="invisible"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="5dp"
android:orientation="vertical">
<TextView
android:id="#+id/schoolSetupText"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="School Setup"
android:textSize="20dp"
android:layout_marginLeft="50dp"/>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<EditText
android:id="#+id/classNameText"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="5"
android:hint="Class name, e.g Grade one" />
<Button
android:id="#+id/delete_button"
android:layout_width="0dp"
android:layout_height="40dp"
android:layout_weight="1"
android:background="#android:drawable/ic_delete"/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:layout_gravity="center">
<Button
android:id="#+id/addNewClassButton"
android:layout_marginTop="15dp"
android:layout_marginLeft="50dp"
android:layout_width="100dp"
android:layout_height="50dp"
android:text="Add new class"
android:textColor="#ffff"
android:background="#color/colorPrimary"/>
<Button
android:id="#+id/nextButton"
android:layout_marginTop="25dp"
android:layout_marginLeft="8dp"
android:layout_width="100dp"
android:layout_height="50dp"
android:text="Next"
android:textColor="#ffff"
android:background="#color/green"/>
</LinearLayout>
</LinearLayout>
</LinearLayout>
</ScrollView>
</LinearLayout>
Here is the Field.xml file for the edit text to be added. Both the field.xml and the activity.school_search_setup.xml share the same IDs.
Field.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/schoolSetupLayout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="5dp"
android:orientation="vertical">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<EditText
android:id="#+id/classNameText"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="5"
android:hint="Class name, e.g Grade one" />
<Button
android:id="#+id/delete_button"
android:layout_width="0dp"
android:layout_height="40dp"
android:layout_weight="1"
android:background="#android:drawable/ic_delete"/>
</LinearLayout>
</LinearLayout>
Have you tried using
setVisibility(View.GONE);
Update:
Try this code block:
LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(
LinearLayout.LayoutParams.MATCH_PARENT,
LinearLayout.LayoutParams.WRAP_CONTENT);
Button btn = new Button(this);
btn.setId(i);
final int id_ = btn.getId();
btn.setText("button " + id_);
btn.setBackgroundColor(Color.rgb(80, 80, 90));
linear.addView(btn, params);
btn1 = ((Button) findViewById(id_));
btn1.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
Toast.makeText(view.getContext(),
"Button clicked index = " + id_, Toast.LENGTH_SHORT)
.show();
}
});
This question already has answers here:
ConstraintLayout views in top left corner
(5 answers)
Closed 5 years ago.
I recently started coding and I wanted to make an app that tells the percentage of a number but the UI keeps overlapping each other please help me solve this because this is my first app and I don't want the first app I made to fail
this is what it looks like in an android studio
and this is what it looks like in the emulator
package com.example.abhay.mathsucks;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.View;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity {
TextView totalTextView;
EditText percentageTxt;
EditText numberTxt;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
totalTextView = (TextView) findViewById(R.id.totalTextView);
percentageTxt = (EditText) findViewById(R.id.percentageTxt);
numberTxt = (EditText) findViewById(R.id.numberTxt);
Button calcBtn = (Button) findViewById(R. id.calcBtn);
calcBtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
float percentage = Float.parseFloat(percentageTxt.getText().toString());
float dec = percentage / 100;
float total = dec * Float.parseFloat(numberTxt.getText().toString());
totalTextView.setText(Float.toString(total));
}
});
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
this the mainactivity.java file
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="#string/appbar_scrolling_view_behavior"
tools:context="com.example.abhay.mathsucks.MainActivity"
tools:showIn="#layout/activity_main">
<TextView
android:id="#+id/totalTextView"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginBottom="443dp"
android:paddingTop="10dp"
android:text="0"
android:textAlignment="center"
android:textAppearance="#android:style/TextAppearance.Material.Large"
android:textSize="40sp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent" />
<TextView
android:id="#+id/textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="%"
android:textAlignment="center"
android:textSize="20sp"
tools:layout_editor_absoluteX="353dp"
tools:layout_editor_absoluteY="206dp" />
<TextView
android:id="#+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingTop="10dp"
android:text="What is"
android:textAlignment="center"
android:textSize="20sp"
android:visibility="visible"
tools:layout_editor_absoluteX="147dp"
tools:layout_editor_absoluteY="104dp" />
<EditText
android:id="#+id/numberTxt"
android:layout_width="368dp"
android:layout_height="wrap_content"
android:ems="10"
android:hint="Enter Number"
android:inputType="numberDecimal"
android:paddingTop="10dp"
android:textAlignment="center"
android:textSize="18sp"
tools:layout_editor_absoluteX="-4dp"
tools:layout_editor_absoluteY="370dp" />
<EditText
android:id="#+id/percentageTxt"
android:layout_width="337dp"
android:layout_height="wrap_content"
android:ems="10"
android:hint="Enter Percentage"
android:inputType="numberDecimal"
android:textAlignment="center"
android:visibility="visible"
tools:layout_editor_absoluteX="12dp"
tools:layout_editor_absoluteY="170dp" />
<TextView
android:id="#+id/textView3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingTop="10dp"
android:text="Of"
android:textAlignment="center"
android:textSize="20sp"
android:visibility="visible"
tools:layout_editor_absoluteX="170dp"
tools:layout_editor_absoluteY="272dp" />
<Button
android:id="#+id/calcBtn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#f92b2b"
android:paddingTop="10dp"
android:text="Calculate"
android:textColor="#android:color/background_light"
android:textColorLink="#android:color/background_light"
android:textSize="10sp"
tools:layout_editor_absoluteX="136dp"
tools:layout_editor_absoluteY="447dp" />
</android.support.constraint.ConstraintLayout>
content_main.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.abhay.mathsucks.MainActivity">
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="#style/AppTheme.AppBarOverlay">
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="#f92b2b"
app:popupTheme="#style/AppTheme.PopupOverlay" />
</android.support.design.widget.AppBarLayout>
<include
android:id="#+id/back"
layout="#layout/content_main"
android:visibility="visible"
tools:ignore="IncludeLayoutParam" />
</android.support.design.widget.CoordinatorLayout>
activity_main.xml
I think you messed up with Constraint-layout...
May this one help you
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
>
<LinearLayout
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="0"
android:layout_marginTop="10dp"
android:textSize="20dp"
android:textColor="#000"
android:gravity="center"/>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="What is"
android:layout_marginTop="30dp"
android:textSize="20dp"
android:gravity="center"/>
<LinearLayout
android:weightSum="2"
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<EditText
android:layout_weight="1.5"
android:layout_marginRight="20dp"
android:layout_marginLeft="20dp"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="Enter Percentage"
android:layout_marginTop="30dp"
android:textSize="20dp"
android:maxLength="3"
android:inputType="number"
android:gravity="center"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="%"
android:layout_marginTop="30dp"
android:textSize="20dp"
android:layout_weight="0.5"
android:gravity="center"/>
</LinearLayout>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="of"
android:layout_marginTop="50dp"
android:textSize="20dp"
android:gravity="center"/>
<EditText
android:layout_weight="1.5"
android:layout_marginRight="20dp"
android:layout_marginLeft="20dp"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="Enter Number"
android:layout_marginTop="30dp"
android:textSize="20dp"
android:inputType="number"
android:gravity="center"/>
</LinearLayout>
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Calculate"
android:layout_alignParentBottom="true"/>
I'm still learning how to make android apps and I'm practicing using the different controls, like EditText, radio buttons, dialog boxes, etc.
I'm trying to have the user enter some info into the app and then display that info into a dialog box when they press the "save" button. Whenever I press save, the app crashes.
I know it has something to do with my onClick method where I set all the input to strings so they can be written to the dialog box. It seems to happening when I try to convert the data from the spinner, radio button, and toggle button to string. When I comment those out, the dialog box works fine with just the edit text data.
Can anyone see what's wrong?
Java code
import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ToggleButton;
import android.widget.Spinner;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.ArrayAdapter;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemSelectedListener;
import android.content.DialogInterface;
import android.app.AlertDialog;
import java.text.DecimalFormat;
import java.util.Calendar;
public class ActMain extends Activity {
//----------------------------------------------------------------
// Variables
//----------------------------------------------------------------
// Declare variables
EditText etAppName;
Spinner spCategory;
RadioGroup rgRating;
RadioButton rbGood;
RadioButton rbFair;
RadioButton rbBad;
ToggleButton tbGooglePlay;
EditText etPrice;
Button btnSave;
//----------------------------------------------------------------
// Activity overrides
//----------------------------------------------------------------
//----------------------------------------------------------------
// onCreate
//----------------------------------------------------------------
#Override
protected void onCreate(Bundle savedInstanceState) {
System.out.println("### DEBUG ### onCreate started at " + currentTime() + ".");
super.onCreate(savedInstanceState);
setContentView(R.layout.laymain);
// Define edit text controls
etAppName = (EditText) findViewById(R.id.etAppName);
etPrice = (EditText) findViewById(R.id.etPrice);
// Define spinner adapter
String[] categories = {"Business", "Comics", "Education", "Finance", "Games", "Music", "News", "Tools", "Travel", "Weather"};
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, categories);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
// Define spinner control
spCategory = (Spinner) findViewById(R.id.spCategory);
spCategory.setAdapter(adapter);
// Define spinner event
spCategory.setOnItemSelectedListener(new OnItemSelectedListener()
{
public void onItemSelected(AdapterView<?> parent,
View view, int position, long id)
{
System.out.println("Spinner: \"" +
parent.getItemAtPosition(position) +
"\" selected.");
}
public void onNothingSelected(AdapterView<?> parent)
{
System.out.println("Spinner: no item selected.");
}
});
// Define save button click event
btnSave = (Button) findViewById(R.id.btnSave);
btnSave.setOnClickListener(new View.OnClickListener()
{
public void onClick(View v)
{
AlertDialog.Builder builder = new AlertDialog.Builder(v.getContext());
builder.setTitle("Mobile App Reviewer Message");
String appName = etAppName.getText().toString();
String price = etPrice.getText().toString();
String category = spCategory.getSelectedItem().toString();
int rbCheckedId = rgRating.getCheckedRadioButtonId();
RadioButton rbChecked = (RadioButton) findViewById(rbCheckedId);
String rating = rbChecked.getText().toString();
String onGooglePlay;
if(tbGooglePlay.isChecked())
onGooglePlay = "NO";
else
onGooglePlay = "YES";
builder.setMessage("Application: " + appName +
"\nCategory: " + category+
"\nRating: " + rating +
"\nOn Google Play? " + onGooglePlay +
"\nPrice: $" + price +
"\nSave this data?");
builder.show();
}
});
}
XML Code
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin" >
<!--
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Title rows - Text View
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-->
<TextView
android:text="Software News"
android:textSize="22sp"
android:textStyle="bold"
android:gravity="center"
android:layout_gravity="center"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="0dp"
android:layout_margin="4dp"/>
<TextView
android:text="Mobile App Reviewer"
android:textSize="20sp"
android:textStyle="bold"
android:gravity="center"
android:layout_gravity="center"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="0dp"
android:layout_margin="4dp"/>
<!--
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
App info
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-->
<!--
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
App name - Edit text
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-->
<LinearLayout
android:gravity="left"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Application: "
android:textStyle="bold"
android:textSize="14sp"
android:gravity="left"
android:layout_gravity="top"
android:padding="4dp"
android:layout_margin="4dp" />
<EditText
android:id="#+id/etAppName"
android:textSize="16sp"
android:background="#33CCCC"
android:gravity="left"
android:layout_gravity="left"
android:layout_width="100dp"
android:layout_height="25dp"
android:padding="0dp"
android:layout_margin="4dp" />
</LinearLayout>
<!--
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
App Category - Spinner
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-->
<LinearLayout
android:gravity="left"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:layout_margin="6dp" >
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Category: "
android:textStyle="bold"
android:textSize="14sp"
android:gravity="left"
android:layout_gravity="top"
android:padding="4dp"
android:layout_margin="4dp" />
<Spinner
android:id="#+id/spCategory"
android:layout_width="160dp"
android:layout_height="wrap_content" />
</LinearLayout>
<!--
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
App Rating - Radio Buttons
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-->
<LinearLayout
android:gravity="left"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:layout_margin="6dp" >
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Rating: "
android:textStyle="bold"
android:textSize="14sp"
android:gravity="left"
android:layout_gravity="top"
android:padding="4dp"
android:layout_margin="4dp" />
<RadioGroup
android:id="#+id/rgRating"
android:gravity="left"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical" >
<RadioButton
android:id="#+id/rbGood"
android:text="Good"
android:textSize="14sp"
android:textStyle="bold"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:onClick="onRadioButtonClicked" />
<RadioButton
android:id="#+id/rbFair"
android:text="Fair"
android:textSize="14sp"
android:textStyle="bold"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:onClick="onRadioButtonClicked" />
<RadioButton
android:id="#+id/rbBad"
android:text="Bad"
android:textSize="14sp"
android:textStyle="bold"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:onClick="onRadioButtonClicked" />
</RadioGroup>
</LinearLayout>
<!--
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
On Google Play? - Toggle Button
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-->
<LinearLayout
android:gravity="left"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:layout_margin="6dp" >
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="On Google Play? "
android:textStyle="bold"
android:textSize="14sp"
android:gravity="left"
android:layout_gravity="top"
android:padding="4dp"
android:layout_margin="4dp" />
<ToggleButton
android:id="#+id/tbGooglePlay"
android:textOn="NO"
android:textOff="YES"
android:textSize="12sp"
android:textStyle="bold"
android:layout_width="75dp"
android:layout_height="wrap_content"/>
</LinearLayout>
<!--
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
On Google Play? - Toggle Button
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-->
<LinearLayout
android:gravity="left"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:layout_margin="6dp" >
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Price: $ "
android:textStyle="bold"
android:textSize="14sp"
android:gravity="left"
android:layout_gravity="top"
android:padding="4dp"
android:layout_margin="4dp" />
<EditText
android:id="#+id/etPrice"
android:textSize="16sp"
android:background="#33CCCC"
android:inputType="numberDecimal"
android:gravity="left"
android:layout_gravity="left"
android:layout_width="100dp"
android:layout_height="25dp"
android:padding="0dp"
android:layout_margin="4dp" />
</LinearLayout>
<Button
android:id="#+id/btnSave"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="6dp"
android:background="#A0CFEC"
android:gravity="center"
android:padding="4dp"
android:text="Save"
android:textSize="14sp"
android:textStyle="bold" />
</LinearLayout>
rgRating is not assigned to anything. So you will get a nullPointerException when calling getCheckedRadioButtonId.
This would be obvious if you checked the stack trace or debugged the application.
To fix it, assign an ID to rgRating in the XML file and do a
rgRating = findViewById(...)
...before you try to call getCheckedRadioButtonId()
Try this:
AlertDialog dialog = builder.create();
dialog.show();
change this
AlertDialog.Builder builder = new AlertDialog.Builder(v.getContext());
to
AlertDialog.Builder builder = new AlertDialog.Builder(ActMain.this);
So after #DKIT pointed out my error with rgRating, I noticed that I had done the same thing with tbGooglePlay.
In the end, adding these lines of code to the Java file fixed my issue:
rgRating = (RadioGroup) findViewById(R.id.rgRating);
tbGooglePlay = (ToggleButton) findViewById(R.id.tbGooglePlay);
I have a problem with creating things using LayoutInflater:
package com.tip.calculator;
import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.LinearLayout;
public class MainActivity extends Activity implements View.OnClickListener {
EditText billamount, percent, people;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.fragment_main);
billamount = (EditText)findViewById(R.id.billtext);
percent = (EditText)findViewById(R.id.percenttext);
people = (EditText)findViewById(R.id.numberpeople);
Button unevensplitbutton = (Button)findViewById(R.id.unevensplit);
Button calculates = (Button)findViewById(R.id.calculate);
unevensplitbutton.setOnClickListener(this);
calculates.setOnClickListener(this);
}
public void onClick(View v) {
switch(v.getId()){
case R.id.calculate:
TableLayout calculatenumberinflated = (TableLayout)findViewById(R.id.numbertable2);
View view = getLayoutInflater().inflate(R.layout.calculatenumbertable,calculatenumberinflated,false);
calculatenumberinflated.addView(view);
break;
case R.id.unevensplit:
break;
}
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
And the XML of calculatenumbertable:
<?xml version="1.0" encoding="utf-8"?>
<TableLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:padding="25dp"
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/numbertable2">
<TableRow
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Each Person Pays"
android:id="#+id/numberpeople"
android:layout_column="3" />
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:inputType="number"
android:ems="10"
android:id="#+id/eachpersonedit"
android:layout_column="6" />
</TableRow></TableLayout>
And the XML of fragment_main:
<TableLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:padding="25dp">
<TableRow
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Bill amount"
android:id="#+id/bill"
android:layout_column="3" />
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:inputType="numberDecimal"
android:ems="10"
android:id="#+id/billtext"
android:layout_column="6" />
</TableRow>
<TableRow
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Percentage %"
android:id="#+id/percentage"
android:layout_column="3" />
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:inputType="numberDecimal"
android:ems="10"
android:id="#+id/percenttext"
android:layout_column="6" />
</TableRow>
<TableRow
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Number of people"
android:id="#+id/textView"
android:layout_column="3" />
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:inputType="number"
android:ems="10"
android:id="#+id/numberpeople"
android:layout_column="6" />
</TableRow>
<TableRow
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Split Unevenly"
android:id="#+id/unevensplit"
android:layout_column="3" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Calculate"
android:id="#+id/calculate"
android:layout_column="6" />
</TableRow>
</TableLayout>
</ScrollView>
It returns an error where:
12-16 21:22:56.825 28459-28459/com.tip.calculator E/AndroidRuntime﹕ FATAL EXCEPTION: main
java.lang.NullPointerException
at com.tip.calculator.MainActivity.onClick(MainActivity.java:35)
Where line 35 is the calculatenumberinflated.addView(view); line of code.
I feel lost right now, can someone please clarify what I am doing wrong? Thanks.
You are getting Nullpointer error at this line TableLayout calculatenumberinflated = (TableLayout)findViewById(R.id.numbertable2); which is not at all available in your fragment_main layout. It in the layout calculatenumbertable file and as you are inflating fragment_main layout so its not getting the correct id of your TableLayout.
Try to add your layout in TableRow besides TableLayout. Create separate row in your calculatenumbertable layout and then try add the layout in that row. You can not add layout directly in TableLayout.
Try as below:
In your calculatenumbertable add row in last as below:
<TableRow
android:id="#+id/tablerow"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
</TableRow>
In your onClick add the layout as below:
public void onClick(View v) {
switch(v.getId()){
case R.id.calculate:
TableRowcalculatenumberinflated = (TableRow)findViewById(R.id.tablerow);
View view = getLayoutInflater().inflate(R.layout.calculatenumbertable,calculatenumberinflated,false);
calculatenumberinflated.addView(view);
break;
case R.id.unevensplit:
break;
}
}
Just move android:id="#+id/numbertable2" from calculatenumbertable.xml to fragment_main.xml in the tableLayouts.
Try this
LayoutInflater inflater=getLayoutInflater();
View view= inflater.inflate(R.layout.calculatenumbertable, null);
calculatenumberinflated.addView(view);