Why cant I display a new activity? (intent)

Question

I cannot figure out why my new activity wont start (I have omitted all the irrelevant code)

I am trying to display a main menu once the time has ended

public class GRenderer implements Renderer 
{

    public void timer ()
     {
        Game.currentGameTime = System.currentTimeMillis();
        Game.ellapsedTime = Game.currentGameTime - Game.gameStartTime;

        if (Game.ellapsedTime > 10000)
        {
            // THIS IS WHEN The GAME SHOULD END
            Toast.makeText(Game.context, "10Seconds", Toast.LENGTH_SHORT).show();
            Intent MainMenu = new Intent(getApplicationContext(),MainMenu.class); 
            startActivity(MainMenu);
        }
    }

    @Override
    public void onDrawFrame(GL10 gl) // when drawing to screen
    {
        timer();
    }
}

Here is the logcat:

12-13 18:28:28.500: E/AndroidRuntime(20184): FATAL EXCEPTION: GLThread 1386

12-13 18:28:28.500: E/AndroidRuntime(20184): Process: com.damienrenner.spacefruitshooter, PID: 20184

12-13 18:28:28.500: E/AndroidRuntime(20184): java.lang.NullPointerException

12-13 18:28:28.500: E/AndroidRuntime(20184):    at android.content.ContextWrapper.getApplicationContext(ContextWrapper.java:109)

12-13 18:28:28.500: E/AndroidRuntime(20184):    at com.damienrenner.spacefruitshooter.GameLoop.timer(GameLoop.java:280)

12-13 18:28:28.500: E/AndroidRuntime(20184):    at com.damienrenner.spacefruitshooter.GameLoop.onDrawFrame(GameLoop.java:296)

12-13 18:28:28.500: E/AndroidRuntime(20184):    at android.opengl.GLSurfaceView$GLThread.guardedRun(GLSurfaceView.java:1523)

12-13 18:28:28.500: E/AndroidRuntime(20184):    at android.opengl.GLSurfaceView$GLThread.run(GLSurfaceView.java:1240)

try using `getActivity()` instead of `getApplicationContext()` — Rohan Kandwal, Dec 13 '13 at 18:36

score 0 · Answer 1 · edited May 23 '17 at 12:11

0

use following code:

    Intent MainMenu = new Intent(YourActivity.this,MainMenu.class); 
    startActivity(MainMenu);

instead of

    Intent MainMenu = new Intent(getApplicationContext(),MainMenu.class); 
    startActivity(MainMenu);

for more info about getApplicationContext() read this

edited May 23 '17 at 12:11

Community

1
1

answered Dec 13 '13 at 18:37

Shayan Pourvatan

11,898
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score 0 · Accepted Answer · answered Dec 13 '13 at 18:39

0

you can only start an activity from another activity . Seems like GRenderer is not your activity.you should pass this to your GLSurfaceView activity.

answered Dec 13 '13 at 18:39

nitesh goel

6,338
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how said this @nitesh? – Shayan Pourvatan Dec 13 '13 at 18:41
@Shayanpourvatan in this declaration "public class GRenderer implements Renderer " i am not seeing any activity . – nitesh goel Dec 13 '13 at 18:42
You can also start Activities from Service and BroadcastReceivers. http://stackoverflow.com/questions/3606596/android-start-activity-from-service – DeeV Dec 13 '13 at 18:43
He's getting a NullPointerException in whatever Gameloop#timer() method is. It's killing his Activity before it starts is my guess. – DeeV Dec 13 '13 at 18:44
he is getting nullPointerException in java.lang.NullPointerException at android.content.ContextWrapper.getApplicationContext – nitesh goel Dec 13 '13 at 18:45
because he/she try to call intent with `getApplicationContext()`, he/she must call with context of activity – Shayan Pourvatan Dec 13 '13 at 18:46

Why cant I display a new activity? (intent)

2 Answers2