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>
