Android活动由于内容而产生黑屏

Question

I have 2 activities.

ActivityA starts activityB from a button click.

When the button is clicked i create a new dialog and display an image as a kind of cut down loading screen (not bothered with progress bars).

when activityB starts the dialog from ActivityA is killed and i immediately start a new one at the top of oncreate. My oncreate for activityB does quite a few things.

Creates an adview, some text for the main view and creates a GLsurface renderer.

The problem is that when activityB's oncreate is called i get a 4 second black screen between my two dialogs. I would like to try and reduce this as much as i can.

So is there anyway to have the dialog in activity B run immdeiately rather than waiting for the rest of the onCreate to finish doing what it is doing. Will provide code if need be

UPDATE. it is the creation of my glsurface renderer that is causing the black screen for so long. Here is the Activity B code

public class ActivityB extends BaseGameActivity
{
/** Hold a reference to our GLSurfaceView */
private MyGLSurfaceView mGLSurfaceView;
public GamePlay GamePlay;
public GoogleApiClient mGoogleApiClient = null;
private AdView adView;
private static final String AD_UNIT_ID = "******************************";
private Button RotateButton;

@Override
public void onCreate(Bundle savedInstanceState)
{       
    super.onCreate(savedInstanceState);
    // load screen dialog
     Dialog loader_dialog = new Dialog(this,android.R.style.Theme_Black_NoTitleBar_Fullscreen);
        loader_dialog.setContentView(R.layout.loading_screen);
        loader_dialog.show();
    // Create an ad.
    adView = new AdView(this);
    adView.setAdSize(AdSize.SMART_BANNER);
    adView.setAdUnitId(AD_UNIT_ID);

    // Add the AdView to the view hierarchy. The view will have no size
    // until the ad is loaded.
    RelativeLayout layout = new RelativeLayout(this);
    layout.setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT,    LayoutParams.MATCH_PARENT));

    // Create an ad request. Check logcat output for the hashed device ID to
    // get test ads on a physical device.
    AdRequest adRequest = new AdRequest.Builder()
    .addTestDevice("*****************************").build();
    // Start loading the ad in the background.
    adView.loadAd(adRequest);

    final TextView Score = new TextView(this);
    Score.setText(" 0");
    RelativeLayout.LayoutParams scoreParams = new 
    RelativeLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT); 
    Score.setLayoutParams(scoreParams);

    Typeface tf = Typeface.createFromAsset(getAssets(),"Fonts/test.ttf");
    Score.setTextSize(getResources().getDimension(R.dimen.textsize));
    Score.setTypeface(tf);
    Score.setTextColor(Color.parseColor("#FDAA03"));

    LayoutInflater inflater = (LayoutInflater) this.getSystemService(this.LAYOUT_INFLATER_SERVICE);
    View userInterface = inflater.inflate(R.layout.user_interface, null);

    GameButton = (Button) userInterface.findViewById(R.id.gamebutton);

    GameButton.setOnTouchListener(new OnTouchListener()
    {
        @Override
        public boolean onTouch(View v, MotionEvent event)
        {
            //irrelivant game stuff

        }
    });

    // Check if the system supports OpenGL ES 2.0.
    final ActivityManager activityManager = (ActivityManager) getSystemService(Context.ACTIVITY_SERVICE);
    final ConfigurationInfo configurationInfo = activityManager.getDeviceConfigurationInfo();
    final boolean supportsEs2 = configurationInfo.reqGlEsVersion >= 0x20000;

    if (supportsEs2)
    {

        // Request an OpenGL ES 2.0 compatible context.
        mGLSurfaceView = new MyGLSurfaceView(this); new GLSurfaceView(this);
        mGLSurfaceView.setEGLContextClientVersion(2);           
        final DisplayMetrics displayMetrics = new DisplayMetrics();
        getWindowManager().getDefaultDisplay().getMetrics(displayMetrics);          
        // Set the renderer to our demo renderer, defined below.
        mGoogleApiClient = getApiClient();

        RelativeLayout.LayoutParams adParams = 
                new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.WRAP_CONTENT, 
                    RelativeLayout.LayoutParams.WRAP_CONTENT);
            adParams.addRule(RelativeLayout.ALIGN_PARENT_BOTTOM);
            adParams.addRule(RelativeLayout.CENTER_HORIZONTAL);
        layout.addView(mGLSurfaceView);
        layout.addView(userInterface);
        layout.addView(Score);
        layout.addView(adView, adParams);

        mGLSurfaceView.setRenderer(new MyRenderer(this, Score,  mGoogleApiClient),displayMetrics);


        //Set main renderer             
        setContentView(layout); 


    }
    else
    {
        // This is where you could create an OpenGL ES 1.x compatible
        // renderer if you wanted to support both ES 1 and ES 2.
        return;
    }   

}   


@Override
protected void onResume() 
{
    // The activity must call the GL surface view's onResume() on activity onResume().
    super.onResume();
    mGLSurfaceView.onResume();
}

@Override
protected void onPause()
{
    // The activity must call the GL surface view's onPause() on activity onPause().
    super.onPause();
    mGLSurfaceView.onPause();
}

}

Answer 1

You could use an AsyncTask for this.

Only prepare the UI elements inside onCreate (get references to views you need, show dialog) but move all the heavy lifting tasks to an AsyncTask , and update the UI (dismiss dialog, populate views, ...) from there in onPostExecute once the loading is done. You could even use the AsyncTask to show loading progress if needed ;)

Answer 2

You can use a

public static Dialog d;

in Activity A. show in activity a move to activity B and aftar all the operation done successfull you can dismiss that dialog from activity B. like

if(A.d.isshowing()){
  A.d.dismiss();
}

Hope this will solve your problem..