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My webview doesn't start after creating progress bar

I created my new webapp. It worked well. But I wanted to add a progress bar. The progress bar works, but my webview doesn't show anynore. I don't understand why. Can someone may help, please?
I tried all the codes I found online. They are ok for the others, but not for me.
Here my manifest file:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android">
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<application
android:allowBackup="true"
android:fullBackupOnly="true"
android:icon="#drawable/donorionepng"
android:label="PCDO GENOVA"
android:roundIcon="#mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="#style/Theme.PCDOPCDOGENOVA"
android:usesCleartextTraffic="true">
<activity
android:name=".MainActivity" android:configChanges="keyboard|keyboardHidden|orientation|screenLayout|uiMode|screenSize|smallestScreenSize"
android:exported="true"/>
<activity
android:name=".SplashActivity" android:configChanges="keyboard|keyboardHidden|orientation|screenLayout|uiMode|screenSize|smallestScreenSize"
android:exported="true" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<action android:name="android.intent.action.VIEW" />
<category android:name="android.intent.category.DEFAULT" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
Here my MainActivity.java
package it.donorionegenova.pcdopcdogenova;
import androidx.appcompat.app.AppCompatActivity;
import androidx.swiperefreshlayout.widget.SwipeRefreshLayout;
import android.content.pm.ActivityInfo;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.os.Handler;
import android.os.Looper;
import android.view.KeyEvent;
import android.view.View;
import android.webkit.ClientCertRequest;
import android.webkit.WebChromeClient;
import android.webkit.WebResourceRequest;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.Button;
import android.widget.ProgressBar;
import android.widget.TextView;
import androidx.core.content.res.ResourcesCompat;
import com.onesignal.OneSignal;
import android.annotation.SuppressLint;
public class MainActivity extends AppCompatActivity {
private static final String ONESIGNAL_APP_ID = "........ de2";
private SwipeRefreshLayout swipeRefreshLayout;
private WebView webView;
ProgressBar progressBar;
#SuppressLint("SetJavaScriptEnabled")
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ProgressBar progressBar = findViewById(R.id.prBar);
webView = findViewById(R.id.webView);
webView.getSettings().setJavaScriptEnabled(true);
webView.loadUrl("https://www.donorione-genova.it/home-app");
webView.setWebViewClient(new WebViewClient());
webView.setWebChromeClient(new WebChromeClient() {
#Override
public void onProgressChanged(WebView view, int newProgress) {
super.onProgressChanged(view, newProgress);
progressBar.setProgress(newProgress);
if (newProgress == 100) {
webView.setVisibility(View.VISIBLE);
progressBar.setVisibility(View.GONE);
} else {
webView.setVisibility(View.GONE);
progressBar.setVisibility(View.VISIBLE);
}
}
});
TextView textView = findViewById(R.id.textview);
textView.postDelayed(() -> textView.setText("loading..."), 500); // delay of 2 seconds before setting a text to textView
textView.postDelayed(() -> textView.setVisibility(View.GONE), 2000);
// Enable verbose OneSignal logging to debug issues if needed.
OneSignal.setLogLevel(OneSignal.LOG_LEVEL.VERBOSE, OneSignal.LOG_LEVEL.NONE);
// OneSignal Initialization
OneSignal.initWithContext(this);
OneSignal.setAppId(ONESIGNAL_APP_ID);
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_SENSOR);
WebSettings settings = webView.getSettings();
settings.setJavaScriptEnabled(true);
settings.setDisplayZoomControls(false);
settings.supportZoom();
settings.setSupportZoom(true);
settings.setBuiltInZoomControls(true);
// settings.setCacheMode(WebSettings.LOAD_CACHE_ELSE_NETWORK);
settings.setLoadWithOverviewMode(true);
settings.setUseWideViewPort(true);
settings.setDomStorageEnabled(true);
settings.setLoadsImagesAutomatically(true);
webView.clearHistory();
webView.clearCache(true);
registerForContextMenu(webView);
webView = findViewById(R.id.webView);
webView.getSettings().setJavaScriptEnabled(true);
webView.loadUrl("https://www.donorione-genova.it/home-app");
webView.setWebViewClient(new WebViewClient() {
#Override
public boolean shouldOverrideUrlLoading(WebView View, WebResourceRequest request) {
final Uri uri = request.getUrl();
if (uri.toString().startsWith("mailto:")) {
//Handle mail Urls
startActivity(new Intent(Intent.ACTION_SENDTO, uri));
} else if (uri.toString().startsWith("tel:")) {
//Handle telephony Urls
startActivity(new Intent(Intent.ACTION_DIAL, uri));
} else {
//Handle Web Urls
webView.loadUrl(uri.toString());
}
return true;
}
});
//per fare il refresh
swipeRefreshLayout = findViewById(R.id.swipe);
swipeRefreshLayout.setOnRefreshListener(() -> {
swipeRefreshLayout.setRefreshing(true);
new Handler().postDelayed(() -> {
swipeRefreshLayout.setRefreshing(false);
webView.reload();
}, 2000);
});
swipeRefreshLayout.setColorSchemeColors(
ResourcesCompat.getColor(
getResources(), R.color.holo_blue_dark, null),
ResourcesCompat.getColor(
getResources(), R.color.holo_orange_dark, null),
ResourcesCompat.getColor(
getResources(), R.color.holo_green_dark, null),
ResourcesCompat.getColor(
getResources(), R.color.holo_red_dark, null));
}
public void gohome(View v)
{
webView.loadUrl("https://donorione-genova.it/home-app");
}
public void clickexit(View v)
{
moveTaskToBack(true);
android.os.Process.killProcess(android.os.Process.myPid());
System.exit(1);
}
public void onBackPressed() {
if(webView.canGoBack()) {
webView.goBack();
}
else
super.onBackPressed();
}
}
And here my ActivityMain:
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto">
<androidx.swiperefreshlayout.widget.SwipeRefreshLayout
android:id="#+id/swipe"
android:layout_width="match_parent"
android:layout_height="match_parent">
<ProgressBar
android:id="#+id/prBar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
style="?android:attr/progressBarStyleHorizontal" />
<WebView
android:id="#+id/webView"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
android:visibility="visible" >
</WebView>
</androidx.swiperefreshlayout.widget.SwipeRefreshLayout>
<Button
android:id="#+id/button"
android:layout_width="185dp"
android:layout_height="wrap_content"
android:background="#0063B1"
android:onClick="clickexit"
android:text="#string/Chiudi"
android:textColor="#color/white"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_weight="1"
app:layout_constraintStart_toEndOf="#+id/button2">
</Button>
<Button
android:id="#+id/button2"
android:layout_width="185dp"
android:layout_height="wrap_content"
android:background="#0063B1"
android:onClick="gohome"
android:text="#string/Home"
android:textColor="#color/white"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toStartOf="#+id/button"
app:layout_constraintHorizontal_weight="1"
app:layout_constraintStart_toStartOf="parent">
</Button>
<TextView
android:id="#+id/textview"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text=""
android:textColor="#0000ff"
android:textSize="40sp"
android:textAlignment="center"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent">
</TextView>
</androidx.constraintlayout.widget.ConstraintLayout>

I didn't use SwipeRefreshLayout, but the documentation says you need to include another layout inside it. As you added a second view inside, you are now using it as a default ViewGroup, which is probably not working as expected. Put a LinearLayout or whatever inside the SwipeRefreshLayout and your components inside your LinearLayout.

Java Resource errors

We are having a resource error when we try to run our code.
package com.example.searchtest;
import android.app.Activity;
import android.app.SearchManager;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
public class GoogleSearchIntentActivity extends Activity {
private EditText editTextInput;
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
editTextInput = (EditText) findViewById(R.id.editTextInput);
}
public void onSearchClick(View v)
{
try {
Intent intent = new Intent(Intent.ACTION_WEB_SEARCH);
String term = editTextInput.getText().toString();
intent.putExtra(SearchManager.QUERY, term);
startActivity(intent);
} catch (Exception e) {
// TODO: handle exception
}
}
}
<?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" android:padding="10dp">
<edittext
android:id="#+id/editTextInput"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="Enter search text">
<requestfocus>
</requestfocus></edittext>
<button
android:id="#+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Search"
android:layout_gravity="center"
android:onclick="onSearchClick"
android:layout_margintop="10dp">
</button></linearlayout>
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.searchtest">
<uses-permission android:name="android.permission.INTERNET">
</uses-permission>
<application
android:allowBackup="true"
android:icon="#mipmap/ic_launcher"
android:label="#string/app_name"
android:roundIcon="#mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="#style/AppTheme">
<activity android:name=".GoogleSearchIntentActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
these are our mainActivity.java, activity_main.xml, and AndroidManifest.xml codes from our app.
The error is within our public class GoogleSearchIntentActivity extends Activity
We are high school students trying to create an image search app for our computer science capstone class, we have been trying to fix this error without success, and our teacher is completely clueless.

Components in your xml file must have a first capitalized letter.
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical" android:padding="10dp">
<EditText
android:id="#+id/editTextInput"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="Enter search text">
<requestFocus>
</requestFocus></EditText>
<Button
android:id="#+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Search"
android:layout_gravity="center"
android:onclick="onSearchClick"
android:layout_margintop="10dp">
</Button></LinearLayout>

Error:Execution failed for task ':app:transformClassesWithDexForDebug'.

For some reason when i run the app in Android studio its giving me this:
Error:Could not create the Java Virtual Machine.
Error:Execution failed for task ':app:transformClassesWithDexForDebug'.
Error:A fatal exception has occurred. Program will exit.
> com.android.ide.common.process.ProcessException: org.gradle.process.internal.ExecException: Process 'command 'C:\Program Files (x86)\Java\jdk1.7.0_80\bin\java.exe'' finished with non-zero exit value 1
Information:BUILD FAILED
This happnes in android studio. Here is my app:
MainActivity.java:
package com.example.amanuel.webview;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.webkit.WebView;
import android.widget.Button;
import android.widget.EditText;
public class MainActivity extends AppCompatActivity {
private Button button;
private WebView webView;
private EditText editText;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
OnClickEvent();
}
public void OnClickEvent(){
button = (Button) findViewById(R.id.Url_Button);
webView = (WebView) findViewById(R.id.webView);
editText = (EditText) findViewById(R.id.Edit_Text_Url);
button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
String url = editText.getText().toString();
webView.getSettings().setLoadsImagesAutomatically(true);
webView.getSettings().setJavaScriptEnabled(true);
webView.setScrollBarStyle(View.SCROLLBARS_INSIDE_OVERLAY);
webView.loadUrl(url);
}
});
}
}
activity_main.xml:
<?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:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
android:paddingBottom="#dimen/activity_vertical_margin"
tools:context="com.example.amanuel.webview.MainActivity">
<Button
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="URL"
android:id="#+id/Url_Button"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true" />
<WebView
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:id="#+id/webView"
android:layout_below="#+id/Edit_Text_Url"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true" />
<EditText
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="#+id/Edit_Text_Url"
android:layout_below="#+id/Url_Button"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:text="https://google.com" />
</RelativeLayout>
And AndroidManifest.xml:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.amanuel.webview" >
<uses-permission android:name="android.permission.INTERNET"/>
<application
android:allowBackup="true"
android:icon="#mipmap/ic_launcher"
android:label="#string/app_name"
android:supportsRtl="true"
android:theme="#style/AppTheme" >
<activity android:name=".MainActivity" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
Help would be really appreciated!

You might be having multiple dex files with same signatures to fix this add this in your app level gradle file.
defaultConfig {
multiDexEnabled true
}

This ERROR have POSSIBLE SOLUTION
SOLUTION 1.
If some conflicting drawable resources found then It give the same error. So you have to clean the Project and rebuild it.
SOLUTION 2.
Problem with RAM : So close the application which are not used. and free the Memory RAM.
SOLUTION 3.
GC overhead (out of memory) :
so add this in build.gradle file.
android {
dexOptions {
incremental = true;
preDexLibraries = false
javaMaxHeapSize "4g" // 2g should be also OK
}
}

I cannot get Google Maps API to work on my android Application (V2)

In main2.xml there are apparently no errors. Same thing for main.xml however I think the problem lies here somewhere.
Quick Summary of what the app is: It is meant to use Google Maps onClick of a button but I am getting errors so I can just load the main menu on testing.
XML
I don't have enough rep to post picture so error pic can be found here
main2.xml
<?xml version="1.0" encoding="utf-8"?>
<fragment xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/map"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:name="com.google.android.gms.maps.MapFragment"/>
main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/linearLayout1"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<TextView
android:id="#+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Club Deals"
android:textAppearance="?android:attr/textAppearanceLarge" />
<Button
android:id="#+id/button1"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="GPS locations" />
<Button
android:id="#+id/button2"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Closest Deals"
android:onClick="open_close_deals" />
<Button
android:id="#+id/button6"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Cheapest Deals"
android:onClick="open_cheap_deals" />
<Button
android:id="#+id/button7"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Best Value Deals"
android:onClick="best_value" />
<Button
android:id="#+id/button8"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Best Events"
android:onClick="best_events" />
<Button
android:id="#+id/button9"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="News"
android:onClick="news"/>
</LinearLayout>
AppActivity.java
In AppActivity I am given
"map cannot be resolved or is not a field" & "main2 cannot be resolved or is not a field"
package com.example.clubnightsdeals;
import android.R;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.MapFragment;
public class AppActivity extends Activity {
Button button;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
// addListenerOnButton();
}
public void addListenerOnButton() {
final Context context = this;
button = (Button) findViewById(R.id.button1);
button.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View arg0) {
Intent intent = new Intent(getApplicationContext(), App2Activity.class);
startActivity(intent);
}
});
};
public void addListenerOnButtonNews() {
final Context context = this;
button = (Button) findViewById(R.id.button9);
button.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View arg0) {
Intent intent = new Intent(getApplicationContext(), App2Activity.class);
startActivity(intent);
}
});
};
/* protected void onCreate1(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main2);
}
*/
// Google Map
GoogleMap googleMap;
protected void onCreate1(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main2);
try {
// Loading map
initilizeMap();
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* function to load map. If map is not created it will create it for you
* */
private void initilizeMap() {
if (googleMap == null) {
googleMap = ((MapFragment) getFragmentManager().findFragmentById(
R.id.map)).getMap();
// check if map is created successfully or not
if (googleMap == null) {
Toast.makeText(getApplicationContext(),
"Sorry! unable to create maps", Toast.LENGTH_SHORT)
.show();
}
}
}
#Override
protected void onResume() {
super.onResume();
initilizeMap();
}
}
In App2Activity I am given the error "The import com.example.clubnightsdeals.R cannot be resolved"
App2Activity.java
package com.example.clubnightsdeals;
import android.app.Activity;
import android.os.Bundle;
import android.widget.Button;
import com.example.clubnightsdeals.R;
public class App2Activity extends Activity {
Button button;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main2);
}
}
Manifest:
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.clubnightsdeals"
android:versionCode="1"
android:versionName="1.0" >
<permission
android:name="info.androidhive.googlemapsv2.permission.MAPS_RECEIVE"
android:protectionLevel="signature" />
<uses-sdk
android:minSdkVersion="12"
android:targetSdkVersion="18" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="com.google.android.providers.gsf.permission.READ_GSERVICES" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<!-- Required to show current location -->
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<!-- Required OpenGL ES 2.0. for Maps V2 -->
<uses-feature
android:glEsVersion="0x00020000"
android:required="true" />
<application
android:icon="#drawable/ic_launcher"
android:label="#string/app_name" >
<activity
android:label="#string/clubnightsdeals"
android:name=".AppActivity" >
<intent-filter >
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<uses-library
android:name="com.google.android.maps" />
<activity
android:label="#string/clubnightsdeals"
android:name=".App2Activity" >
</activity>
<meta-data
android:name="com.google.android.maps.v2.API_KEY"
android:value="AIzaSyDetfYqNFORnvtR245fht3RIK25T6DRY" />
  <activity
            android:name="info.androidhive.googlemapsv2.MainActivity"
            android:label="#string/app_name"
            android:theme="#style/AppBaseTheme">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
 
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
</application>
</manifest>

You are pointing to wrong R.java file. Replace your following import line
import android.R;
with
import com.example.clubnightsdeals.R;
in your AppActivity.java file.

Your error shows that you have not closed the <activity> tag in your manifest file.
Make sure you have closed your activity tag as <activity android:name=""...../> or <activity android:name=""> </activity>

First remove
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
in manifest (cannot have 2 start activity in a App) then try to import R library.
If it still has this R error, check your xml files - make sure check all xml files.

Blank Page after clicking button android eclipse?

I thought I did everything right but when I click the button I get a blank page instead of a page with a text. I want that the creation.xml comes up after clicking the button on the main xml. What did I wrong ?
My main activity xml
<RelativeLayout 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: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=".MainActivity"
android:background="#drawable/creeper" >
<TextView
android:id="#+id/textView1"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:text="#string/hello"
android:textSize="20sp" />
<Button
android:id="#+id/button1"
android:layout_width="200dp"
android:layout_height="60dp"
android:layout_below="#+id/textView1"
android:layout_centerHorizontal="true"
android:layout_marginTop="70dp"
android:textSize="20sp"
android:text="#string/button1_text" />
</RelativeLayout>
My main activity java
package com.berkcoop.deneme;
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
public class MainActivity extends Activity {
Button button1, button2;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
button1 = (Button) findViewById(R.id.button1);
button1.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent intent1 = new Intent(MainActivity.this, Creation.class);
startActivity(intent1);
}
});
}
My creation xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<TextView
android:layout_width="fill_parent"
android:layout_height="50dp"
android:text="Creations"
android:textSize="25sp"
android:gravity="center"/>
</LinearLayout>
manifest
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.berkcoop.deneme"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="19" />
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity
android:name="com.berkcoop.deneme.MainActivity"
android:label="#string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name="com.berkcoop.deneme.Creation"
android:label="#string/app_name" >
</activity>
</application>
</manifest>
and my creation java
package com.berkcoop.deneme;
import android.app.Activity;
public class Creation extends Activity{
#Override
public void setContentView(int layoutResID) {
// TODO Auto-generated method stub
super.setContentView(R.layout.creation);
}
}
Thank you..

Why do you override the setContentView method in your Creation class? Since you don't call it, it won't set the correct view.
You should call setContentView from onCreate, and as far as I know, there is no need to override setContentView.
Try this in Creation:
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.creation);
}