Kill intent on splash screen

问题

this is my Splash Screen, If I press home or multitasking/appswitch button when Intent is started app crash, in logcat is FATAL EXEPTION: Thread-1277. Can I kill/delete this Intent when player press home button?

public class SplashScreen extends Activity {
private static int loadingTime = 1000;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    requestWindowFeature(Window.FEATURE_NO_TITLE);
    getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
    WindowManager.LayoutParams.FLAG_FULLSCREEN);
    getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);

    setVolumeControlStream(AudioManager.STREAM_MUSIC);

    setContentView(R.layout.loading_screen);

    new Handler().postDelayed(new Runnable() {
        @Override
        public void run() {
            Intent i = new Intent(SplashScreen.this, MainActivity.class);
            startActivity(i);
            finish();
        }
    }, loadingTime);
}
}

回答1:

The following code tracks whether the SplashActivity is at least partially showing. If yes, it will continue to MainActivity. If not (activity is finished by pressing Back button, activity is stopped by pressing Home button) nothing happens.

This solution uses Fragments so the timing is preserved across e.g. screen orientation changes (it will always take specified time no matter how many times you rotate your device - the timer will not reset).

public class SplashActivity extends Activity {
  // tracks when the activity is at least partially visible (e.g. under a dialog)
  private boolean mStarted = false;

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    // your current code
    requestWindowFeature(Window.FEATURE_NO_TITLE);
    getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
        WindowManager.LayoutParams.FLAG_FULLSCREEN);
    getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
    setVolumeControlStream(AudioManager.STREAM_MUSIC);
    setContentView(R.layout.activity_startup);

    if (savedInstanceState == null) {
      // first time onCreate, create fragment which starts countdown
      getFragmentManager()
          .beginTransaction()
          .add(SplashFinishFragment.newInstance(), SplashFinishFragment.TAG)
          .commit();
    } else {
      // fragment already set up from first onCreate after screen rotation
    }
  }

  @Override
  protected void onStart() {
    // the activity becomes at least partially visible
    mStarted = true;

    super.onStart();
  }

  @Override
  protected void onStop() {
    // the activity is no longer visible
    mStarted = false;

    super.onStop();
  }

  public boolean isStarted2() {
    // there is already hidden method isStarted() in the framework
    // you can't use it and are not allowed to override it
    return mStarted;
  }

  public static class SplashFinishFragment extends Fragment {
    private static final String TAG = SplashFinishFragment.class.getSimpleName();

    private static final int DELAY = 1000; // one second delay

    private static final Handler mHandler = new Handler(); // one main thread anyway

    private final Runnable mRunnable = new Runnable() {
      @Override
      public void run() {
        if (getActivity() == null) {
          // this should never happen, there is no activity, so no fragment
          Log.e(TAG, "No activity!");
          return;
        }

        SplashActivity a = (SplashActivity) getActivity();

        if (a.isStarted2() || a.isChangingConfigurations()) {
          // if activity is even partially visible or is rotating screen right now, continue
          Intent i = new Intent(a, SettingsActivity.class);
          a.startActivity(i);
        }

        // in any case close splash
       a.finish();
      }
    };

    public static SplashFinishFragment newInstance() {
      return new SplashFinishFragment();
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);

      // the countdown will continue (not reset) across screen rotations
      setRetainInstance(true);

      // try running the main activity after specified time
      mHandler.postDelayed(mRunnable, DELAY);
    }

    @Override
    public void onDestroy() {
      // if the fragment gets destroyed (e.g. activity closes) do not launch main activity
      mHandler.removeCallbacks(mRunnable);

      super.onDestroy();
    }
  }
}

This was tested on a virtual Galaxy S2. It works when Home or Back button is pressed. It doesn't work when Recent Apps button is pressed. I don't know your use case but personally I would expect the app to continue launching while I browse recent apps.

来源：https://stackoverflow.com/questions/26821689/kill-intent-on-splash-screen