I'm trying to load an mp3 file which is stored on my sdcard. I'm using an HTC One phone that's why the path looks funny but i'm 90% it's correct.
Could somebody help me figure out why the app keeps force closing when I start my activity page2.java?
here's my code
public class page2 extends Activity {
MediaPlayer mediaPlayer;
boolean isPlaying = false;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
this.requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.page2);
try {
mediaPlayer.setDataSource("/storage/emulated/0/Audio/sounds/first.mp3");
} catch (IllegalArgumentException | SecurityException
| IllegalStateException | IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
mediaPlayer.start();
final ImageView Play_button = (ImageView)findViewById(R.id.playbutton);
Play_button.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
if(isPlaying){
Play_button.setImageResource(R.drawable.stopicon);
isPlaying = false;
}else {
Play_button.setImageResource(R.drawable.playicon);
isPlaying = true;
}
}
});
}
}
and this is my log
05-19 21:33:54.337: I/dalvikvm-heap(23333): Grow heap (frag case) to 20.389MB for 7322452-byte allocation
05-19 21:33:54.417: I/dalvikvm-heap(23333): Grow heap (frag case) to 27.376MB for 7322452-byte allocation
05-19 21:33:54.497: I/dalvikvm-heap(23333): Grow heap (frag case) to 34.365MB for 7322452-byte allocation
05-19 21:33:55.438: I/dalvikvm-heap(23333): Grow heap (frag case) to 129.877MB for 26873872-byte allocation
05-19 21:33:56.649: I/dalvikvm-heap(23333): Grow heap (frag case) to 155.560MB for 26873872-byte allocation
05-19 21:33:56.870: I/dalvikvm-heap(23333): Grow heap (frag case) to 164.561MB for 9437200-byte allocation
05-19 21:33:56.940: W/dalvikvm(23333): threadid=1: thread exiting with uncaught exception (group=0x416a0e18)
05-19 21:33:56.950: E/AndroidRuntime(23333): FATAL EXCEPTION: main
05-19 21:33:56.950: E/AndroidRuntime(23333): Process: com.example.app, PID: 23333
05-19 21:33:56.950: E/AndroidRuntime(23333): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.app/com.example.app.page2}: java.lang.NullPointerException
05-19 21:33:56.950: E/AndroidRuntime(23333): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2596)
05-19 21:33:56.950: E/AndroidRuntime(23333): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2653)
05-19 21:33:56.950: E/AndroidRuntime(23333): at android.app.ActivityThread.access$800(ActivityThread.java:156)
05-19 21:33:56.950: E/AndroidRuntime(23333): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1355)
05-19 21:33:56.950: E/AndroidRuntime(23333): at android.os.Handler.dispatchMessage(Handler.java:102)
05-19 21:33:56.950: E/AndroidRuntime(23333): at android.os.Looper.loop(Looper.java:157)
05-19 21:33:56.950: E/AndroidRuntime(23333): at android.app.ActivityThread.main(ActivityThread.java:5872)
05-19 21:33:56.950: E/AndroidRuntime(23333): at java.lang.reflect.Method.invokeNative(Native Method)
05-19 21:33:56.950: E/AndroidRuntime(23333): at java.lang.reflect.Method.invoke(Method.java:515)
05-19 21:33:56.950: E/AndroidRuntime(23333): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1069)
05-19 21:33:56.950: E/AndroidRuntime(23333): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:885)
05-19 21:33:56.950: E/AndroidRuntime(23333): at dalvik.system.NativeStart.main(Native Method)
05-19 21:33:56.950: E/AndroidRuntime(23333): Caused by: java.lang.NullPointerException
05-19 21:33:56.950: E/AndroidRuntime(23333): at com.example.app.page2.onCreate(page2.java:31)
05-19 21:33:56.950: E/AndroidRuntime(23333): at android.app.Activity.performCreate(Activity.java:5312)
05-19 21:33:56.950: E/AndroidRuntime(23333): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1111)
05-19 21:33:56.950: E/AndroidRuntime(23333): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2552)
05-19 21:33:56.950: E/AndroidRuntime(23333): ... 11 more
05-19 21:34:02.676: D/Process(23333): killProcess, pid=23333
05-19 21:34:02.676: D/Process(23333): com.android.internal.os.RuntimeInit$UncaughtHandler.uncaughtException:131 java.lang.ThreadGroup.uncaughtException:693 java.lang.ThreadGroup.uncaughtException:690
Initialize your var declaration before the try condition as follows:
mediaPlayer = new MediaPlayer();
This will create a new MediaPlayer retrieved by the var previously created.