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Add more than one element to set content view

i have a app set up which loads a website into the app which works fine, when i try to add another element to the content view the app crashes without a error, How can i add more than one element to my set content view? ive tried it with frame layout and more but they all dont seem to work.
Here is my code
package com.example.fiercepcs;
import android.content.Context;
import android.os.Bundle;
import com.example.fiercepcs.databinding.ActivityMainBinding;
import com.google.android.material.snackbar.Snackbar;
import androidx.appcompat.app.AppCompatActivity;
import android.view.LayoutInflater;
import android.view.View;
import androidx.navigation.NavController;
import androidx.navigation.Navigation;
import androidx.navigation.ui.AppBarConfiguration;
import androidx.navigation.ui.NavigationUI;
import android.view.Menu;
import android.view.MenuItem;
import android.view.ViewGroup;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.app.Application;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.RelativeLayout;
public class MainActivity extends AppCompatActivity {
private ActivityMainBinding binding;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
LinearLayout screenLayout = new LinearLayout(this);
screenLayout.setOrientation(LinearLayout.VERTICAL);
Button button = (Button) findViewById(R.id.button);
WebView myWebView = new WebView(getApplicationContext());
WebSettings webSettings = myWebView.getSettings();
webSettings.setJavaScriptEnabled(true);
myWebView.loadUrl("https://www.fiercepc.co.uk");
setContentView(myWebView);
setContentView(button);
}
}
my activity main xml file
<?xml version="1.0" encoding="utf-8"?>
<androidx.coordinatorlayout.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:id="#+id/layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<com.google.android.material.appbar.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="#style/Theme.FiercePcs.AppBarOverlay" />
<include
android:id="#+id/include"
layout="#layout/content_main" />
<FrameLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
xmlns:android="http://schemas.android.com/apk/res/android">
<WebView
android:id="#+id/webview"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:translationZ="-5dp">
</WebView>
<Button
android:id="#+id/button"
android:layout_width="312dp"
android:layout_height="179dp"
android:scaleX="1"
android:scaleY="1"
android:text="#string/button"
android:visibility="visible"
app:layout_anchor="#+id/include"
app:layout_anchorGravity="center" />
</FrameLayout>
</androidx.coordinatorlayout.widget.CoordinatorLayout>

your app crashes because your are trying to set button view and webView as the root layout, don't do that, inflate or bind the root of your layout with ActivityMainBinding
do it like this :
public class MainActivity extends AppCompatActivity {
private ActivityMainBinding binding;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
bindnig = ActivityMainBinding.inflate(layoutInflater)
setContentView(binding.root)
LinearLayout screenLayout = new LinearLayout(this);
screenLayout.setOrientation(LinearLayout.VERTICAL);
Button button = (Button) findViewById(R.id.button);
WebView myWebView = new WebView(getApplicationContext());
WebSettings webSettings = myWebView.getSettings();
webSettings.setJavaScriptEnabled(true);
myWebView.loadUrl("https://www.fiercepc.co.uk");
}
}

Making a textview global

I am wondering if there is any way that you can make a textview visible over every screen so that I don't have to individually create a textview on every activity.
I want to do this so I can display my application version on every screen for debugging.
Thank you.

Yes! it is possible.
See you have to add this code.
<include layout="#layout/layout_version"/>
and
public class MainActivity extends BaseActivity {
}
And you will find version text.
Just add this few code.
(1) Create a layout that will represent version text.
layout_version.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content" // or match_parent (according to your need)
android:layout_height="wrap_content">
<TextView
android:id="#+id/tvVersion"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
... other properties
/>
<!--... other component if required-->
</LinearLayout>
(2) Include this to your activity layout like activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
...>
<include layout="#layout/layout_version"/>
</LinearLayout>
(3) Create a BaseActivity.class or add my code if you have already.
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v7.app.AppCompatActivity;
import android.widget.TextView;
import com.innovanathinklabs.sample.BuildConfig;
import com.innovanathinklabs.sample.R;
public class BaseActivity extends AppCompatActivity {
#Override
protected void onCreate(#Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
TextView tvVersion = findViewById(R.id.tvVersion);
if (tvVersion != null) tvVersion.setText(BuildConfig.VERSION_NAME);
}
}
(4) Final step is to extend all your activity by BaseActivity.class.
public class MainActivity extends BaseActivity {
}
That's all!

Icon In ToolBar does not appear

I just created and activity which contains toolbar and I put in this tool bar a tick icon at the right but when I run the app the tick icon doesn't appear in tool bar this is my class
package mediaclub.app.paymob;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.widget.ImageView;
import android.widget.ListView;
import java.util.ArrayList;
import mediaclub.app.paymob.Adapters.ContactsAdapter;
public class AddMembersActivity extends Activity {
ArrayList<Contact> listContacts;
ListView lvContacts;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_add_members);
listContacts = new ContactFetcher(this).fetchAll();
lvContacts = (ListView) findViewById(R.id.lvContacts);
ImageView checkContacts = (ImageView) findViewById(R.id.checkedId);
ContactsAdapter adapterContacts = new ContactsAdapter(this, listContacts);
lvContacts.setAdapter(adapterContacts);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.iconmenu, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(android.view.MenuItem item) {
switch (item.getItemId()) {
case R.id.checkedId:
Intent i = new Intent(AddMembersActivity.this, AddMembersActivity.class);
startActivity(i);
return true;
}
return super.onOptionsItemSelected(item);
}
}
and this is menu
<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto">
<item android:id="#+id/checkedId"
android:icon="#drawable/checked"
android:title="#string/check"
app:showAsAction="always"/>
</menu>
this is XML File
<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="wrap_content"
xmlns:fab="http://schemas.android.com/apk/res-auto"
android:orientation="vertical"
android:background="#ffffff"
xmlns:app="http://schemas.android.com/apk/res-auto"
tools:context="mediaclub.app.paymob.AddMembersActivity">
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:backgroundTint="#3cb5a4"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="?attr/colorPrimary"
android:minHeight="?attr/actionBarSize" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="fill_parent"
android:layout_weight="91"
android:orientation="horizontal"
android:weightSum="100" >
<ListView
android:id="#+id/lvContacts"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true" >
</ListView>
</LinearLayout>
</LinearLayout>
Sorry if in thing is not clear if any one know how to solve this case please just answer me
sorry for my bad english

Add this in onCreate() , initialize the toolbar
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);

you are never setting the toolbar that's the problem try this method and call this from onCreate
public void showToolBar() {
toolbar = (Toolbar) findViewById(R.id.toolbar);
toolbar.setTitle("title for toolbar");
setSupportActionBar(toolbar);
//toolbar.setNavigationIcon(R.drawable.ic_toolbar_arrow);
toolbar.setNavigationOnClickListener(
new View.OnClickListener() {
#Override
public void onClick(View v) {
//handling the onclick
}
}
);
}

1. Try extending AddMembersActivity from AppCompatActivity instead of Activity.
public class AddMembersActivity extends AppCompatActivity {
.............
..................
}
2. In onCreate() method, initialize your Toolbar widget and use it as an ActionBar by using method setSupportActionBar().
public class AddMembersActivity extends AppCompatActivity {
ArrayList<Contact> listContacts;
ListView lvContacts;
Toolbar mToolBar;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_add_members);
mToolBar = (Toolbar) findViewById(R.id.toolbar);
if(mToolBar != null) {
setSupportActionBar(mToolBar);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
}
listContacts = new ContactFetcher(this).fetchAll();
lvContacts = (ListView) findViewById(R.id.lvContacts);
ImageView checkContacts = (ImageView) findViewById(R.id.checkedId);
ContactsAdapter adapterContacts = new ContactsAdapter(this, listContacts);
lvContacts.setAdapter(adapterContacts);
}
.................
............................
}
FYI, You have to add below dependencies in your build.gradle to use AppCompatActivity.
dependencies {
..........
..............
compile 'com.android.support:appcompat-v7:25.1.0'
}
Hope this will help~

Can I use setContentView outside the oncreate method?

I have seen many people telling that you can set setContentView outside the oncreate method, but I didn't find anywhere an example. Now when I try to use setContentView, my app just crashes. Here is my source code:
AlarmActivity.java:
package com.alarm.example;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup.LayoutParams;
import android.widget.Button;
import android.widget.RelativeLayout;
public class AlarmActivity extends Activity{
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Button buton = new Button(this);
buton.setId(101);
buton.setText("New alarm");
buton.setLayoutParams(new LayoutParams(LayoutParams.FILL_PARENT,LayoutParams.WRAP_CONTENT));
RelativeLayout layout1 = new RelativeLayout(this);
layout1.setLayoutParams(new LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT));
layout1.addView(buton);
setContentView(layout1);
Button nou =(Button)findViewById(101);
nou.setOnClickListener(new View.OnClickListener(){
#Override
public void onClick(View v){
New_ala nou1=new New_ala();
nou1.nou_alarma();
}
});
}
}
New_ala.java:
package com.alarm.example;
public class New_ala extends AlarmActivity{
public void nou_alarma() {
setContentView(R.layout.timepicker);
}
}
TimePicker.xml:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<TimePicker
android:id="#+id/timePicker"
android:layout_width="fill_parent"
android:layout_height="wrap_content" />
<LinearLayout
android:layout_height="wrap_content"
android:layout_width="fill_parent"
android:layout_alignParentBottom="true">
<Button
android:id="#+id/picker_save"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="Save">
</Button>
<Button
android:id="#+id/picker_cancel"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="Cancel">
</Button>
</LinearLayout>
</LinearLayout>
On more detail, I can use setContentView(R.layout.timepicker) inside the oncreate method without any problems so the problem is that setContentView isn't working properly inside the New_ala.java class. Can anyone help me?
The code after setting the intent:
AlarmActivity:
package com.alarm.example;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
public class AlarmActivity extends Activity{
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
startActivity(new Intent(this, NewAlarmActivity.class));
}
}
NewAlarmActivity:
package com.alarm.example;
import android.os.Bundle;
public class NewAlarmActivity extends AlarmActivity{
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.timepicker);
}
}

You can call setContentView any time you are running on the event (UI) thread. Be aware that when you do, any fields you initialized by calling findViewById will need to be reset.

The best way to do that is to have multiple activities: instead of nou1.nou_alarma();, create an intent and start a new activity with the new layout.
startActivity(new Intent(this, NewAlarmActivity.class));
And in the onCreate method of NewAlarmActivity, set the content view to R.layout.timepicker

The setContentView() method can be called only once per activity. If you want to completely change the layout at some point you should either go for ViewFlipper or have 2 layouts in the activity and show only one of them at given time by calling view.setVisibility(View.GONE); and view.setVisibility(View.VISIBLE); respectively.

Tab Layout and buttons in Android

I have built an application in android using Tab Layout and it has 2 tabs. I want a different button on each of these tabs. But if I define button in main.xml, I get same button on both the tabs.
I even tried defining the buttons separately in the class of each tab, but was getting some weird errors. can somebody please help me out with this. Below is my code:
FinalProj.java:
package FinalProj.com;
import android.app.Activity;
import android.app.TabActivity;
import android.content.Intent;
import android.content.res.Resources;
import android.os.Bundle;
import android.widget.TabHost;
public class FinalProj extends TabActivity {
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Resources res = getResources(); // Resource object to get Drawables
TabHost tabHost = getTabHost(); // The activity TabHost
TabHost.TabSpec spec; // Resusable TabSpec for each tab
Intent intent; // Reusable Intent for each tab
intent = new Intent().setClass(this, iFallApp.class);
// Initialize a TabSpec for each tab and add it to the TabHost
spec = tabHost.newTabSpec("artists").setIndicator("Artists",
res.getDrawable(R.drawable.icon))
.setContent(intent);
tabHost.addTab(spec);
// Do the same for the other tabs
intent = new Intent().setClass(this, Settings.class);
spec = tabHost.newTabSpec("albums").setIndicator("Albums",
res.getDrawable(R.drawable.icon))
.setContent(intent);
tabHost.addTab(spec);
tabHost.setCurrentTab(2);
}
}
For Tab1 - iFallApp.java
package FinalProj.com;
import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView;
public class iFallApp extends Activity{
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
TextView textview = new TextView(this);
textview.setText("This is the iFall tab");
setContentView(textview);
}
}
Tab 2 - Settings.java
package FinalProj.com;
import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView;
public class Settings extends Activity{
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
TextView textview = new TextView(this);
textview.setText("This is the Settings tab");
setContentView(textview);
}
}
Main.xml:
<?xml version="1.0" encoding="utf-8"?>
<TabHost xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#android:id/tabhost"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<LinearLayout
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:padding="5dp">
<TabWidget
android:id="#android:id/tabs"
android:layout_width="fill_parent"
android:layout_height="wrap_content" />
<FrameLayout
android:id="#android:id/tabcontent"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:padding="5dp" />
</LinearLayout>
</TabHost>
I want to have one button along with TextView in iFallApp.java and one button and editText in Settings.java.

For anyone else finding this question:
public class FinalProj extends TabActivity {
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
The setContentView(R.layout.main) tells the activity what to display on its UI. In this case the view is being set to load from R.layout.main which corresponds to /layout/main.xml (R being the generated lookup class generated by the android framework).
Changing the main.xml would change both tabs because both tabs are contained /within/ the FinalProj activity inside the TabHost view defined inside of main.xml here:
<TabHost xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#android:id/tabhost"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
The whole tab system is described in full detail here:
Tab Layout | Android Developers