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Thread: Android Application wont launch on AVD in Eclipse

  1. #1
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    Default Android Application wont launch on AVD in Eclipse

    Hello, I am new to android development and this is my first time using eclipse so sorry if this question sounds silly.
    I have created an android application called IFMApp. I have four xml pages and 4 java classes. My application, is cleaning and building fine and will install to the emulator however when I click the app to open on emulator it outputs the message Unfortunately IFMApp has stopped.
    This is a copy of the console from the last compile.

    [2014-05-06 13:45:10 - IFMApp] Android Launch!
    [2014-05-06 13:45:10 - IFMApp] adb is running normally.
    [2014-05-06 13:45:10 - IFMApp] Performing com.pkgifm.ifmapp.MainActivity activity launch
    [2014-05-06 13:45:10 - IFMApp] Automatic Target Mode: launching new emulator with compatible AVD 'em'
    [2014-05-06 13:45:10 - IFMApp] Launching a new emulator with Virtual Device 'em'
    [2014-05-06 13:46:09 - IFMApp] New emulator found: emulator-5554
    [2014-05-06 13:46:09 - IFMApp] Waiting for HOME ('android.process.acore') to be launched...
    [2014-05-06 13:48:38 - IFMApp] HOME is up on device 'emulator-5554'
    [2014-05-06 13:48:38 - IFMApp] Uploading IFMApp.apk onto device 'emulator-5554'
    [2014-05-06 13:48:40 - IFMApp] Installing IFMApp.apk...
    [2014-05-06 13:49:54 - IFMApp] Success!
    [2014-05-06 13:49:55 - IFMApp] Starting activity com.pkgifm.ifmapp.MainActivity on device emulator-5554

    and this is the logcat

    05-06 09:08:38.916: E/AndroidRuntime(1243): FATAL EXCEPTION: main
    05-06 09:08:38.916: E/AndroidRuntime(1243): Process: com.pkgifm.ifmapp, PID: 1243
    05-06 09:08:38.916: E/AndroidRuntime(1243): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.pkgifm.ifmapp/com.pkgifm.ifmapp.MainActivity}: java.lang.NullPointerException

    05-06 09:08:38.916: E/AndroidRuntime(1243): at android.app.ActivityThread.performLaunchActivity(A ctivityThread.java:2195)
    05-06 09:08:38.916: E/AndroidRuntime(1243): at android.app.ActivityThread.handleLaunchActivity(Ac tivityThread.java:2245)
    05-06 09:08:38.916: E/AndroidRuntime(1243): at android.app.ActivityThread.access$800(ActivityThre ad.java:135)
    05-06 09:08:38.916: E/AndroidRuntime(1243): at android.app.ActivityThread$H.handleMessage(Activit yThread.java:1196)
    05-06 09:08:38.916: E/AndroidRuntime(1243): at android.os.Handler.dispatchMessage(Handler.java:10 2)
    05-06 09:08:38.916: E/AndroidRuntime(1243): at android.os.Looper.loop(Looper.java:136)
    05-06 09:08:38.916: E/AndroidRuntime(1243): at android.app.ActivityThread.main(ActivityThread.jav a:5017)
    05-06 09:08:38.916: E/AndroidRuntime(1243): at java.lang.reflect.Method.invokeNative(Native Method)
    05-06 09:08:38.916: E/AndroidRuntime(1243): at java.lang.reflect.Method.invoke(Method.java:515)
    05-06 09:08:38.916: E/AndroidRuntime(1243): at com.android.internal.os.ZygoteInit$MethodAndArgsCa ller.run(ZygoteInit.java:779)

    05-06 09:08:38.916: E/AndroidRuntime(1243): at com.android.internal.os.ZygoteInit.main(ZygoteInit .java:595)
    05-06 09:08:38.916: E/AndroidRuntime(1243): at dalvik.system.NativeStart.main(Native Method)
    05-06 09:08:38.916: E/AndroidRuntime(1243): Caused by: java.lang.NullPointerException
    05-06 09:08:38.916: E/AndroidRuntime(1243): at com.pkgifm.ifmapp.MainActivity.onCreate(MainActivi ty.java:16)
    05-06 09:08:38.916: E/AndroidRuntime(1243): at android.app.Activity.performCreate(Activity.java:5 231)
    05-06 09:08:38.916: E/AndroidRuntime(1243): at android.app.Instrumentation.callActivityOnCreate(I nstrumentation.java:1087)
    05-06 09:08:38.916: E/AndroidRuntime(1243): at android.app.ActivityThread.performLaunchActivity(A ctivityThread.java:2159)
    05-06 09:08:38.916: E/AndroidRuntime(1243): ... 11 more

    --- Update ---

    This is my activity_main xml
            <TextView
                android:id="@+id/txtTitle"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_alignParentTop="true"
                android:layout_centerHorizontal="true"
                android:layout_marginTop="30dp"
                android:text="@string/welcome_to_the_ifm_app"
                android:textAppearance="?android:attr/textAppearanceLarge" />
     
            <TextView
                android:id="@+id/txtMain"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_alignParentLeft="true"
                android:layout_below="@+id/txtTitle"
                android:layout_marginTop="40dp"
                android:text="@string/please_click_on_the_options_available"
                android:textAppearance="?android:attr/textAppearanceMedium" />
     
            <TextView
                android:id="@+id/txtCheck"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_below="@+id/txtMain"
                android:layout_centerHorizontal="true"
                android:layout_marginTop="120dp"
                android:text="@string/click_for_vehicle_checklist"
                android:textAppearance="?android:attr/textAppearanceMedium" />
     
            <Button
                android:id="@+id/btnCheck"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_below="@+id/txtCheck"
                android:layout_centerHorizontal="true"
                android:layout_marginTop="40dp"
                android:text="@string/checklist" />
     
            <TextView
                android:id="@+id/txtDock"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_centerHorizontal="true"
                android:layout_centerVertical="true"
                android:text="@string/please_click_for_engineers_docket"
                android:textAppearance="?android:attr/textAppearanceMedium" />
     
            <Button
                android:id="@+id/btnDock"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_below="@+id/txtDock"
                android:layout_centerHorizontal="true"
                android:layout_marginTop="40dp"
                android:text="@string/docket" />
     
            <TextView
                android:id="@+id/txtDOCare"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_below="@+id/btnDock"
                android:layout_centerHorizontal="true"
                android:layout_marginTop="90dp"
                android:text="@string/please_click_for_duty_of_care"
                android:textAppearance="?android:attr/textAppearanceMedium" />
     
            <Button
                android:id="@+id/btnDOCare"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_below="@+id/txtDOCare"
                android:layout_centerHorizontal="true"
                android:layout_marginTop="40dp"
                android:text="@string/duty_of_care" />

    and this is the java class for it

     
    public class MainActivity extends Activity {
     
        public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
     
            Button btnHome = (Button)findViewById(R.id.btnHome);
            btnHome.setOnClickListener(new View.OnClickListener() {
            	public void onClick(View view) {
            		Intent myIntent = new Intent(view.getContext(),MainActivity.class);
            		startActivityForResult(myIntent, 0);
            	 }
            });    
            }
     
           }

    and this is the android manifest

     
        <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.pkgifm.ifmapp.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=".Checklist"></activity>
            <activity android:name=".Docket"></activity>
            <activity android:name=".DutyOfCare"></activity>
                </application>
    </manifest>


  2. #2
    Crazy Cat Lady KevinWorkman's Avatar
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    Default Re: Android Application wont launch on AVD in Eclipse

    Well, it looks like you have a NullPointerException on line 16 of MainActivity. What are the values of every variable on that line when the code is running?
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  3. #3
    Super Moderator Norm's Avatar
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    Default Re: Android Application wont launch on AVD in Eclipse

    05-06 09:08:38.916: E/AndroidRuntime(1243): Caused by: java.lang.NullPointerException
    05-06 09:08:38.916: E/AndroidRuntime(1243): at com.pkgifm.ifmapp.MainActivity.onCreate(MainActivi ty.java:16)
    This is the part Kevin is referring to.
    If you don't understand my answer, don't ignore it, ask a question.

  4. The Following User Says Thank You to Norm For This Useful Post:

    KevinWorkman (May 6th, 2014)

  5. #4
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    Default Re: Android Application wont launch on AVD in Eclipse

    Is that layout.xml file incomplete? I don't see a definition for btnHome or any layout containers.

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