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我有一个带有 2 个活动(比如 A 和 B)和一个 appWidget 的小应用程序。当我单击小部件时,我启动了一个活动,该活动在做一些事情的同时为小部件设置动画。我是这样做的;

Intent intent = new Intent(context, DialogActivity.class);
PendingIntent pendingIntent = PendingIntent.getActivity(context, 0, intent, 0);
RemoteViews remoteViews = new RemoteViews(context.getPackageName(), R.layout.main);
RemoteViews.setOnClickPendingIntent(R.id.imageButton1, pendingIntent);

然后中的活动onCreate这样做:

    Paint p = new Paint();
    p.setStyle(Paint.Style.FILL);
    p.setColor(Color.TRANSPARENT);

    logger.debug("inizializzo movie"); //$NON-NLS-1$
    Movie movie;
    InputStream is = null;
    long moviestart = 0;
    is = this.getResources().openRawResource(R.drawable.gifanimata);
    movie = Movie.decodeStream(is);

    taskIsrunning = true;

    //this is an AsyncTask that at the end of the work sets taskIsrunning = false
    new InitTask().execute(this);
    while (taskIsrunning) {

    Bitmap bitmap = Bitmap.createBitmap(100, 100, Config.ARGB_8888);
    Canvas canvas = new Canvas(bitmap);
    canvas.drawRect(0, 0, 100, 100, p);

    long now = android.os.SystemClock.uptimeMillis();

    if (moviestart == 0) { // first time
    moviestart = now;

    }
    int relTime = (int) ((now - moviestart) % movie.duration());
    movie.setTime(relTime);

    movie.draw(canvas, 0, 0);
    updateViews.setImageViewBitmap(R.id.imageButton1, bitmap);
    widgetManager.updateAppWidget(theWidget, updateViews);
    try {
    Thread.sleep(500);
    } catch (Exception e) {
    throw e;
    }
    }

最后,从这个活动(女巫是完全透明的)我显示了一个对话框。这就像我想要的那样工作,但问题是:

当我启动活动时,如果之前我打开了应用程序的第一个活动(活动 A)并使用主页按钮将其关闭(活动仍然在堆栈中)而不是使用后退按钮关闭它,则显示对话框的那一刻从小部件启动的活动中,显示了对话框,但也显示了活动 A。

我尝试在清单 android:noHistory="true" 上设置,问题解决了,但是如果从活动 A 我启动活动 B,后退按钮将不会显示活动 A。

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