Unfortunately yourApp has Stopped

Question

1.00/5 (1 vote)

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Main

Java

package com.example.test1;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

public class MainActivity extends Activity {


    @Override
    public void onCreate(Bundle savedInstanceState) 
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
 
        final Button changeActivityButton = (Button)findViewById(R.id.button1);
 
        changeActivityButton.setOnClickListener(
 
        		new View.OnClickListener()
 
        		{
 
                        public void onClick(View v)
                        {
                               Intent intent = new Intent(MainActivity.this, Second.class);
                               startActivity(intent);
                        }
        		}
        		);       
    }
}

Fragment

<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="com.example.test1.MainActivity$PlaceholderFragment" >

    <textview>
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:layout_marginTop="15dp"
        android:text="Name:  "
        android:textAppearance="?android:attr/textAppearanceMedium" />

    <textview>
        android:id="@+id/textView2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/textView1"
        android:layout_below="@+id/textView1"
        android:layout_marginTop="23dp"
        android:text="Mobile: "
        android:textAppearance="?android:attr/textAppearanceMedium" />

    <edittext>
        android:id="@+id/editText1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_above="@+id/textView2"
        android:layout_alignLeft="@+id/button1"
        android:layout_alignParentRight="true"
        android:ems="10"
        android:inputType="textPersonName" />

    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/editText2"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="124dp"
        android:text="Button" />

    <edittext>
        android:id="@+id/editText2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/editText1"
        android:layout_alignRight="@+id/editText1"
        android:layout_alignTop="@+id/textView2"
        android:ems="10"
        android:inputType="phone" >

        <requestfocus />
    </edittext>

</edittext></textview></textview></relativelayout>

Manifest

<manifest xmlns:android="http://schemas.android.com/apk/res/android">
    package="com.example.test1"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk>
        android:minSdkVersion="18"
        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.example.test1.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.example.test1.Second"
            android:label="@string/title_activity_second" >
        </activity>
    </application>

LogCat

04-29 16:30:07.188: W/ApplicationPackageManager(19765): getCSCPackageItemText()
04-29 16:30:07.239: D/AndroidRuntime(19765): Shutting down VM
04-29 16:30:07.239: W/dalvikvm(19765): threadid=1: thread exiting with uncaught exception (group=0x41843da0)
04-29 16:30:07.239: E/AndroidRuntime(19765): FATAL EXCEPTION: main
04-29 16:30:07.239: E/AndroidRuntime(19765): Process: com.example.test1, PID: 19765
04-29 16:30:07.239: E/AndroidRuntime(19765): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.test1/com.example.test1.MainActivity}: java.lang.NullPointerException
04-29 16:30:07.239: E/AndroidRuntime(19765): 	at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2305)
04-29 16:30:07.239: E/AndroidRuntime(19765): 	at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2363)
04-29 16:30:07.239: E/AndroidRuntime(19765): 	at android.app.ActivityThread.access$900(ActivityThread.java:161)
04-29 16:30:07.239: E/AndroidRuntime(19765): 	at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1265)
04-29 16:30:07.239: E/AndroidRuntime(19765): 	at android.os.Handler.dispatchMessage(Handler.java:102)
04-29 16:30:07.239: E/AndroidRuntime(19765): 	at android.os.Looper.loop(Looper.java:157)
04-29 16:30:07.239: E/AndroidRuntime(19765): 	at android.app.ActivityThread.main(ActivityThread.java:5356)
04-29 16:30:07.239: E/AndroidRuntime(19765): 	at java.lang.reflect.Method.invokeNative(Native Method)
04-29 16:30:07.239: E/AndroidRuntime(19765): 	at java.lang.reflect.Method.invoke(Method.java:515)
04-29 16:30:07.239: E/AndroidRuntime(19765): 	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1265)
04-29 16:30:07.239: E/AndroidRuntime(19765): 	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1081)
04-29 16:30:07.239: E/AndroidRuntime(19765): 	at dalvik.system.NativeStart.main(Native Method)
04-29 16:30:07.239: E/AndroidRuntime(19765): Caused by: java.lang.NullPointerException
04-29 16:30:07.239: E/AndroidRuntime(19765): 	at com.example.test1.MainActivity.onCreate(MainActivity.java:20)
04-29 16:30:07.239: E/AndroidRuntime(19765): 	at android.app.Activity.performCreate(Activity.java:5426)
04-29 16:30:07.239: E/AndroidRuntime(19765): 	at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1105)
04-29 16:30:07.239: E/AndroidRuntime(19765): 	at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2269)
04-29 16:30:07.239: E/AndroidRuntime(19765): 	... 11 more

Posted 28-Apr-14 22:30pm

Kye123

Updated 29-Apr-14 3:19am

TorstenH.

v2

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3 solutions

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TorstenH. · Answer 1 · 2014-04-29T03:21:00

Solution 1

 Caused by: java.lang.NullPointerException
04-29 16:30:07.239: E/AndroidRuntime(19765): 	at com.example.test1.MainActivity.onCreate(MainActivity.java:20)

It's a good idea to switch on line numbers in your IDE.

Posted 29-Apr-14 3:21am

TorstenH.

BupeChombaDerrick · Answer 2 · 2014-04-29T09:11:00

Your layout is wrong try this one instead.

Java

<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="com.example.test1.MainActivity$PlaceholderFragment" >
 
    <textview
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:layout_marginTop="15dp"
        android:text="Name:  "
        android:textAppearance="?android:attr/textAppearanceMedium" />
 
    <textview
        android:id="@+id/textView2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/textView1"
        android:layout_below="@+id/textView1"
        android:layout_marginTop="23dp"
        android:text="Mobile: "
        android:textAppearance="?android:attr/textAppearanceMedium" />
 
    <edittext
        android:id="@+id/editText1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_above="@+id/textView2"
        android:layout_alignLeft="@+id/button1"
        android:layout_alignParentRight="true"
        android:ems="10"
        android:inputType="textPersonName" />
 
    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/editText2"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="124dp"
        android:text="Button" />
 
    <edittext
        android:id="@+id/editText2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/editText1"
        android:layout_alignRight="@+id/editText1"
        android:layout_alignTop="@+id/textView2"
        android:ems="10"
        android:inputType="phone" >
 
        <requestfocus />
    </edittext>
 
</relativelayout>

Hope this helps :)

BCD

phil.o · Answer 3 · 2014-04-29T09:22:00

Your XML formatting is wrong. As BupeChombaDerrick2 told in Solution 2, you are closing the parent tag way too early. Not only on 'relativelayout' tag, but also on some other tags below.
Some examples:

Wrong

XML

<textview>
   android:id="@+id/textView1"
   <!-- -->
</textview>

Correct

XML

<textview>
   android:id="@+id/textView1"
   <!-- -->
</textview>

Wrong

XML

<edittext>
   android:id="@+id/editText1"
   <!-- -->
</edittext>

Correct

XML

<edittext>
   android:id="@+id/editText1"
   <!-- -->
</edittext>

You should have a look at some very basics about XML:
XML Language[^]
This is a field which very few developers can afford to ignore, these days :)

Hope this helps.