We Keep Coding

My android app stopping when I touch the button

This is my code guys when I touch the "saldir" button or another button my app
crashes and this is my app's image https://ibb.co/ce3ATm
This is my error (https://ibb.co/jBxb16):
Dergilik APP has stopped
package com.example.rg.myapplication;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity implements
View.OnClickListener
{
int sayac =0;
TextView tv;
**//kind of turkish words don't focus the variables**
TextView tvkarekterOzellikleri;
Button byemekye;
#Override
**//THIS IS MY MAIN_Activity.Java**
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
tv = (TextView)findViewById(R.id.Answer);
//I'm trying very basic app when I touch button this layout'll changed
tvkarekterOzellikleri = (TextView) findViewById(R.id.Question);
Button bsaldir = (Button) findViewById(R.id.saldir);
//comment/i have 3 buttons as you can see on link at top
Button buyu = (Button) findViewById(R.id.uyu);
Button byemekye = (Button) findViewById(R.id.yemekYe);
bsaldir.setOnClickListener(this);
buyu.setOnClickListener(this);
byemekye.setOnClickListener(this);*
//This part useless now because I didn't added this part later I'll add this part
//Character k = new Character();
//k.Movementnum = 10;
//k.Kilos = 10;
//k.FightPower = 10;
//}
#Override
//This part is PROBLEM WHEN I DELETE THIS PART MY CODE IS WORKING
public void onClick(View v){
if (v.getId()==byemekye.getId())
tv.setText("yemek yenildi");
else
tv.setText("Nar" + (sayac++));
}
}
When I delete if.(v.getId....) app is running normal.
This side is my activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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.rg.myapplication.MainActivity">
<Button
android:id="#+id/saldir"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:elevation="0dp"
android:text="saldir" />
<TextView
android:id="#+id/Question"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="top|bottom|center"
android:padding="3dp"
android:text="#string/Dilektasi"
android:textAppearance="#style/TextAppearance.AppCompat.Display2"
android:layout_above="#+id/saldir"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_marginBottom="75dp" />
<TextView
**android:id="#+id/Answer**"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/saldir"
android:layout_centerHorizontal="true"
android:layout_marginTop="70dp"
android:text="" />
//I have 3 button for my app as you can see on image
<Button
android:id="#+id/yemekYe"
**im saying twice pls dont focus on variables**
**next time i'll make this variables english**
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignTop="#+id/saldir"
android:layout_toLeftOf="#+id/saldir"
android:layout_toStartOf="#+id/saldir"
android:text="yemek ye" />
smth smth smth smth
<Button
android:id="#+id/uyu"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignTop="#+id/saldir"
android:layout_toEndOf="#+id/saldir"
android:layout_toRightOf="#+id/saldir"
android:text="Uyu" />
//dont focus the variable names
</RelativeLayout>

I think your problem is this:
Define Buttons:
private Button bt;
Set id of the button on xml, than on onCrate()
bt= (Button) findViewById(R.id.button1); //button1 is the id of the button
bt.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
//do actions
}
});
code:
public class YourActivity extends AppCompatActivity {
private Button btn1;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_post_details);
parent_view = findViewById(android.R.id.content);
btn1= (Button) findViewById(R.id.button1); //button1 is the id of the button
bt.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
//do actions
}
});
}
on xml
<Button
android:id="#+id/butto1" <!-- the id -->
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Button" />

How to change text from another activity?

I am creating an Android app - using Android Studio.
The app launches in MainActivity.java which fetches activity_main.xml . On activity_main, the user can select one of 3 buttons. No matter which button they select, it will take them to the SAME layout - primary_layout.xml and the Java class associated with that is PrimaryClass.java .
I have a placeholder in primary_layout. I want this placeholder (id: placeholder) to change according to what button was previously selected.
Eg. If Button 1 (id: button1) is clicked, then the placeholder must say “Button 1 was clicked.”
Or let’s say Button 2 (id: button2) was clicked, then the placeholder must say “Button 2 was clicked”. And the same goes for Button 3.
I have created an intent to open PrimaryClass but I'm not too sure how to code the intent for when the button is clicked. I just don’t know how to change the text of the placeholder, depending on which button the user has clicked. I’ve tried using an ‘if statement’ but it doesn’t seem to work.
Or instead of creating another activity, should I rather create a fragment, and if I should, how would I code the fragment in this particular app?
I have attached images and code to better understand.
And here is my code of my classes and layout files:
MainActivity:
package com.msp.exampleapplication;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
public class MainActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
}
activity_main:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
tools:context="com.msp.exampleapplication.MainActivity">
<Button
android:text="Button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_alignParentStart="true"
android:id="#+id/button1"
android:onClick="clickedButton1" />
<Button
android:text="Button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/button1"
android:layout_alignParentStart="true"
android:layout_marginTop="27dp"
android:id="#+id/button2"
android:onClick="clickedButton2" />
<Button
android:text="Button3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/button2"
android:layout_alignParentStart="true"
android:layout_marginTop="32dp"
android:id="#+id/button3"
android:onClick="clickedButton3" />
</RelativeLayout>
PrimaryClass:
package com.msp.exampleapplication;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
public class PrimaryClass extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.primary_layout);
}
}
primary_layout:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:text="{holder}"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textSize="35sp"
android:id="#+id/placeholder" />
</LinearLayout>

Your first Activity must look like this:
package com.msp.exampleapplication;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
public class MainActivity extends AppCompatActivity {
Button button1,button2,button3;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
button1=(Button)findViewById(R.id.button1);
button2=(Button)findViewById(R.id.button2);
button3=(Button)findViewById(R.id.button3);
button1.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Intent intent=new Intent(MainActivity.this, PrimaryClass.class);
intent.putExtra("message","Button 1 selected");
startActivity(intent);
}
});
button2.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Intent intent=new Intent(MainActivity.this, PrimaryClass.class);
intent.putExtra("message","Button 2 selected");
startActivity(intent);
}
});
button3.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Intent intent=new Intent(MainActivity.this, PrimaryClass.class);
intent.putExtra("message","Button 3 selected");
startActivity(intent);
}
});
}
}
Code the second activity as below:
package com.msp.exampleapplication;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
public class PrimaryClass extends AppCompatActivity {
TextView placeholder;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.primary_layout);
placeholder=(TextView) findViewById(R.id.placeholder);
placeholder.setText(getIntent().getStringExtra("message"));
}
}

Here is solution of your problem. You have to use Intent to make action in another activity.
Code for MainActivity, create a intent on each button click like below
button_1.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent(MainActivity.this,PrimaryClass.class);
intent.putExtra("button_text", "Button 1 Clicked");
startActivity(intent);
}
});
Same for button 2 and 3
button_2.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent(MainActivity.this,PrimaryClass.class);
intent.putExtra("button_text", "Button 2 Clicked");
startActivity(intent);
}
});
button_3.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent(MainActivity.this,PrimaryClass.class);
intent.putExtra("button_text", "Button 3 Clicked");
startActivity(intent);
}
});
Now in PrimaryClass use this code inside onCreate Method
String btn_text;
Bundle bundle = getIntent().getExtras();
if (bundle != null) {
btn_text = bundle.getString("button_text");
}
Now set text on lable
textView.setText(btn_text);
Hope you understand this, if not let me know, I'll help you.

Accept user input from Activity

I have some experience with Java, but I am now trying to create an Android app and I do not know how to accept user input. The id of my Edit Text is enterRequestMessage and the name of my XML file is activity_score_entry.xml. Here is the beginning of my Java file.
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
public class ScoreEntry extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_score_entry);
}
}

You need to get access to the controls in the xml
public class ScoreEntry extends AppCompatActivity implements View.OnClickListener {
private EditText editText;
private Button button;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_score_entry);
editText = (EditText) findViewById(R.id.editText);
button = (Button) findViewById(R.id.button);
button.setOnClickListener(this);
}
#Override
public void onClick(View view) {
if (view.getId() == R.id.button) {
String value = editText.getText().toString();
// use the value here
Log.d(ScoreEntry.class.getCanonicalName(), "The value is: " + value);
}
}
}
And in the xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/activity_score_entry"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<EditText
android:id="#+id/editText"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<Button
android:id="#+id/button"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</LinearLayout>
You can adjust the code according to your needs.

xml layout crashes on loading for android app

enter image description hereHey guys I'm at the end of my Java 1 class working on my project. We are making a memory/concentration game. My issue is that when I click the easy button for the next activity the app crashes. I have tried using fragments and activities and just can't seem to get it right. I have also tried using the layout I need on my main activity just to see if I could get it to display. Even then it just crashes on startup of the app. Any help would be appreciated.
Startup Screen activity.
package com.bignerdranch.android.memory;
import android.app.Activity;
import android.content.Intent;
import android.media.AudioManager;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.CheckBox;
public class MemoryActivity extends Activity {
private Button mEasy;
private Button mMedium;
private Button mHard;
private CheckBox mSilence;
public MediaPlayer player;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_memory);
player = new MediaPlayer();
player = MediaPlayer.create(this, R.raw.mkstartmusic);
player.setAudioStreamType(AudioManager.STREAM_MUSIC);
player.setLooping(true);
player.start();
mEasy = (Button)findViewById(R.id.easy);
mEasy.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent easy = new Intent(getApplicationContext(), EasyGame.class);
startActivity(easy);
}
});
mMedium = (Button)findViewById(R.id.medium);
mMedium.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
}
});
mHard = (Button)findViewById(R.id.hard);
mHard.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
}
});
mSilence = (CheckBox)findViewById(R.id.silence);
mSilence.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
if(mSilence.isChecked()) {
player.pause();
} else if(mSilence.isChecked() == false) {
player.start();
}
}
});
}
#Override
protected void onStop() {
super.onPause();
if (player != null){
player.stop();
if (isFinishing()){
player.stop();
player.release();
}
}
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.layout.activity_memory, menu);
return true;
}
}
Second Activity (Easy option)
package com.bignerdranch.android.memory;
import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.widget.ImageButton;
public class EasyGame extends Activity {
private ImageButton buttOne;
private ImageButton buttTwo;
private ImageButton buttThree;
private ImageButton buttFour;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_easy);
buttOne = (ImageButton)findViewById(R.id.ImageButton01);
buttOne.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
}
});
buttTwo = (ImageButton)findViewById(R.id.ImageButton02);
buttTwo.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
}
});
buttThree = (ImageButton)findViewById(R.id.ImageButton03);
buttThree.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
}
});
buttFour = (ImageButton)findViewById(R.id.ImageButton04);
buttFour.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
}
});
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.layout.activity_easy, menu);
return true;
}
}
This is the layout for the Easy option
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<ImageView
android:id="#+id/easyback"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_alignParentTop="true"
android:background="#drawable/easyback"
android:clickable="false"
android:duplicateParentState="false"
android:longClickable="false"
android:scaleType="centerCrop" />
<ImageButton
android:id="#+id/ImageButton04"
android:layout_width="80dp"
android:layout_height="80dp"
android:layout_below="#+id/ImageButton01"
android:layout_toRightOf="#+id/ImageButton01"
android:layout_toEndOf="#+id/ImageButton01"
android:maxHeight="25dp"
android:maxWidth="25dp"
android:scaleType="fitXY"
android:src="#drawable/dragonemb" />
<ImageButton
android:id="#+id/ImageButton02"
android:layout_width="80dp"
android:layout_height="80dp"
android:layout_above="#+id/ImageButton04"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true"
android:layout_marginRight="22dp"
android:layout_marginEnd="22dp"
android:maxHeight="25dp"
android:maxWidth="25dp"
android:scaleType="fitXY"
android:src="#drawable/dragonemb" />
<ImageButton
android:id="#+id/ImageButton03"
android:layout_width="80dp"
android:layout_height="80dp"
android:layout_alignTop="#+id/ImageButton04"
android:layout_toLeftOf="#+id/ImageButton04"
android:layout_toStartOf="#+id/ImageButton04"
android:maxHeight="25dp"
android:maxWidth="25dp"
android:scaleType="fitXY"
android:src="#drawable/dragonemb" />
<ImageButton
android:id="#+id/ImageButton01"
android:layout_width="80dp"
android:layout_height="80dp"
android:layout_alignParentTop="true"
android:layout_marginTop="152dp"
android:layout_toLeftOf="#+id/ImageButton02"
android:maxHeight="25dp"
android:maxWidth="25dp"
android:scaleType="fitXY"
android:src="#drawable/dragonemb" />
</RelativeLayout>

OK It's not the full crash log you posted but at the top of it I saw roidManifest.xml?. And It's sure that you didn't defined your EasyGame Activity in your androidmanifest.xml so add this line inside application tag,
<manifest package="com....." . . . >
<application . . . >
<activity
android:name=".EasyGame"
android:label="easygame">
</activity>
. . .
</application>
</manifest>
In addition you are trying to cast your ImageButton into Button consider fixing that as well.

Add code below to AndroidManfest
<activity
android:name=".EasyGame"
/>

its simple just add this line to your AndroidManifest
<activity android:name="Activity"/>
The logcat did mentioned that you need to declare your activity within the Android Manifest which you didn't. please read the logcat carefully as it really helps to find what went wrong.

OK, so I had tried all of your guys suggestions which I had were part of the issue, the final issue turned out to that I needed to add my images to the drawable-xhdpi. Thanks for all your help.

Cannot find symbol id in button

Hello i am making a simple push button in android and this is my mainactivity file
package dk.troll.android;
import android.app.Activity;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.widget.Button;
import android.view.View;
import android.view.View.OnClickListener;
public class MainActivity extends Activity {
Button button;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
addListenerOnButton();
}
public void addListenerOnButton() {
button = (Button) findViewById(R.id.button1);
button.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View arg0) {
Intent browserIntent =
new Intent(Intent.ACTION_VIEW, Uri.parse("http://www.troll.dk"));
startActivity(browserIntent);
}
});
}
}
and this is my xml file
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Lorem Ipsum and so much other stuff"
/>
<Button
android:id="#+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Button - Go To Troll" />
</LinearLayout>
On this line button = (Button) findViewById(R.id.button1); i get the error
cannot find symbol:variable id location:class R
Since the contents of class
r
are auto-generated,how can i fix the error?

fist restart eclipse
then doing this :
1.import R class to your activity, Import dk.troll.android.R;
2.be sure the all recurse file have not any error then try to clean project from Project then Clean.
3.build your project