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作成したカスタム カメラ アクティビティに問題があります。ユーザーがボタン (Action_Down) を押したときにカメラに焦点を合わせ、ユーザーがイメージビュー上で指を離す (Action_Up) と写真を撮り、ユーザーがドラッグアウトするとすべてのアクションをキャンセルするソフトボタンが必要でした。ボタン領域の/ボタンの外側を持ち上げます。

以下は、ImageView に登録したオンタッチ リスナーです。

public boolean onTouch(View v, MotionEvent event) {

    Rect rect = new Rect(v.getLeft(), v.getTop(), v.getRight(),
            v.getBottom());

    StringBuilder sb = new StringBuilder();
    sb.append("rect (l,t,r,b) - " + rect.left + "," + rect.top + ","
            + rect.right + "," + rect.bottom + " x-Event " + event.getX()
            + " y-event " + event.getY() + " event code"
            + event.getAction() + " rect Cont "
            + rect.contains((int) event.getRawX(), (int) event.getRawY()));
    Log.d("Touch", sb.toString());

    switch (v.getId()) {
    case R.id.CameraShutterButton: {
        if (event.getAction() == MotionEvent.ACTION_DOWN) {
            softShutterPressed=true;

            shutter.setImageDrawable(getResources().getDrawable(
                    R.drawable.camera_shutter_pressed));
            if (focusingFlag == false) {
                focusingFlag = true;
                autoFocusIndicator.setImageDrawable(getResources()
                        .getDrawable(R.drawable.autofocus_focusing));
                autoFocusIndicator.setVisibility(View.VISIBLE);
                camera.autoFocus(this);
            }
            shutter.invalidate();
            return true;
        }

        if (event.getAction() == MotionEvent.ACTION_UP
                && rect.contains((int) event.getRawX(),
                        (int) event.getRawY())&&softShutterPressed) {

            shutter.setImageDrawable(getResources().getDrawable(
                    R.drawable.camera_shutter));
            softShutterPressed=false;
            toast.setText("Action Up");
            toast.show();
            if (focusedFlag == true && pictureEventOneShot == false) {

                camera.takePicture(null, null, null, this);

            }

            if (focusedFlag == false && focusingFlag == true
                    && pictureEventOneShot == false) {
                captureWhenFocused = true;
            }

            if (focusedFlag == false && focusingFlag == false
                    && pictureEventOneShot == false) {
                captureWhenFocused = true;
                focusingFlag = true;
                autoFocusIndicator.setImageDrawable(getResources()
                        .getDrawable(R.drawable.autofocus_focusing));
                autoFocusIndicator.setVisibility(View.VISIBLE);

                camera.autoFocus(this);
            }

            shutter.invalidate();
            return true;

        }

        if ((event.getAction() == MotionEvent.ACTION_MOVE && !rect
                .contains((int) event.getRawX(), (int) event.getRawY()))
                || (event.getAction() == MotionEvent.ACTION_UP && !rect
                        .contains((int) event.getRawX(),
                                (int) event.getRawY()))) {
            shutter.setImageDrawable(getResources().getDrawable(
                    R.drawable.camera_shutter));
            softShutterPressed=false;

            if (captureWhenFocused != true) {

                focusedFlag = false;
                focusingFlag = false;
                camera.cancelAutoFocus();
                autoFocusIndicator.setImageDrawable(getResources()
                        .getDrawable(R.drawable.autofocus_focusing));
                autoFocusIndicator.setVisibility(View.GONE);
            } else {

                // Nothing
            }

            shutter.invalidate();
            return true;
        }


    }

    default:
        break;


    }

    return false;
}

私が抱えている問題は、ガベージ コレクションが発生したときに、ユーザーがまだボタンに指を置いていても、イベント Action_UP が誤ってトリガーされることです。以下は logcat の出力です。

10-29 10:57:00.657: D/Touch(4455): rect (l,t,r,b) - 704,24,819,139 x-Event 56.75714 y-event 39.312866 event code2 rect Cont true
10-29 10:57:00.712: D/Touch(4455): rect (l,t,r,b) - 704,24,819,139 x-Event 56.75714 y-event 39.80368 event code2 rect Cont true
10-29 10:57:00.774: D/Touch(4455): rect (l,t,r,b) - 704,24,819,139 x-Event 56.75714 y-event 40.294464 event code2 rect Cont true
10-29 10:57:00.938: D/Touch(4455): rect (l,t,r,b) - 704,24,819,139 x-Event 56.75714 y-event 40.294464 event code1 rect Cont true
10-29 10:57:02.579: D/dalvikvm(4455): GC_FOR_MALLOC freed 1557K, 57% free 3124K/7175K, external 3166K/3417K, paused 82ms
10-29 10:57:02.696: D/dalvikvm(4455): GC_CONCURRENT freed 6K, 43% free 4099K/7175K, external 2885K/3417K, paused 2ms+6ms

(DDMS ビューでヒープをダンプすることによって) ガベージ コレクションがトリガーされると、この偽のアクション アップがトリガーされることを確認しました。

更新されたログ

以下は、ボタンを押してヒープ ダンプを強制し、ガベージ コレクションの直前に誤ったアクション アップ イベントが発生したときのログです。

10-29 12:57:08.884: D/Touch(9532): rect (l,t,r,b) - 704,24,819,139 x-Event 55.88568 y-event 59.92639 event code0 rect Cont true
10-29 12:57:08.923: D/Touch(9532): rect (l,t,r,b) - 704,24,819,139 x-Event 55.88568 y-event 59.92639 event code2 rect Cont true
10-29 12:57:08.985: D/Touch(9532): rect (l,t,r,b) - 704,24,819,139 x-Event 55.88568 y-event 59.92639 event code2 rect Cont true
10-29 12:57:09.477: D/Touch(9532): rect (l,t,r,b) - 704,24,819,139 x-Event 55.88568 y-event 59.92639 event code2 rect Cont true
10-29 12:57:14.430: D/ddm-heap(9532): Heap dump: [DDMS]
10-29 12:57:15.063: I/dalvikvm(9532): hprof: dumping heap strings to "[DDMS]".
10-29 12:57:16.610: I/dalvikvm(9532): hprof: heap dump completed (3503KB)
10-29 12:57:16.618: D/dalvikvm(9532): GC_HPROF_DUMP_HEAP freed 44K, 57% free 3121K/7239K, external 3166K/3417K, paused 2180ms
10-29 12:57:22.137: D/Touch(9532): rect (l,t,r,b) - 704,24,819,139 x-Event 55.88568 y-event 59.92639 event code2 rect Cont true
10-29 12:57:22.173: D/Touch(9532): rect (l,t,r,b) - 704,24,819,139 x-Event 55.88568 y-event 59.92639 event code2 rect Cont true
10-29 12:57:22.243: D/Touch(9532): rect (l,t,r,b) - 704,24,819,139 x-Event 55.88568 y-event 59.92639 event code2 rect Cont true
10-29 12:57:22.266: D/Touch(9532): rect (l,t,r,b) - 704,24,819,139 x-Event 55.88568 y-event 59.92639 event code2 rect Cont true
10-29 12:57:22.332: D/Touch(9532): rect (l,t,r,b) - 704,24,819,139 x-Event 55.88568 y-event 59.92639 event code2 rect Cont true
10-29 12:57:22.353: D/Touch(9532): rect (l,t,r,b) - 704,24,819,139 x-Event 55.88568 y-event 59.92639 event code2 rect Cont true
10-29 12:57:22.829: D/Touch(9532): rect (l,t,r,b) - 704,24,819,139 x-Event 55.88568 y-event 59.92639 event code2 rect Cont true
10-29 12:57:22.860: D/Touch(9532): rect (l,t,r,b) - 704,24,819,139 x-Event 55.88568 y-event 59.92639 event code2 rect Cont true
10-29 12:57:23.649: D/Touch(9532): rect (l,t,r,b) - 704,24,819,139 x-Event 49.785706 y-event 54.52762 event code2 rect Cont true
10-29 12:57:23.673: D/Touch(9532): rect (l,t,r,b) - 704,24,819,139 x-Event 49.785706 y-event 53.54602 event code2 rect Cont true
10-29 12:57:23.712: D/Touch(9532): rect (l,t,r,b) - 704,24,819,139 x-Event 49.785706 y-event 52.07361 event code2 rect Cont true
10-29 12:57:23.720: D/Touch(9532): rect (l,t,r,b) - 704,24,819,139 x-Event 49.785706 y-event 51.582825 event code2 rect Cont true
10-29 12:57:23.751: D/Touch(9532): rect (l,t,r,b) - 704,24,819,139 x-Event 49.785706 y-event 50.601227 event code2 rect Cont true
10-29 12:57:23.766: D/Touch(9532): rect (l,t,r,b) - 704,24,819,139 x-Event 49.785706 y-event 49.61963 event code2 rect Cont true
10-29 12:57:23.782: D/Touch(9532): rect (l,t,r,b) - 704,24,819,139 x-Event 49.785706 y-event 49.128845 event code2 rect Cont true
10-29 12:57:23.798: D/Touch(9532): rect (l,t,r,b) - 704,24,819,139 x-Event 49.785706 y-event 48.147247 event code2 rect Cont true
10-29 12:57:23.813: D/Touch(9532): rect (l,t,r,b) - 704,24,819,139 x-Event 49.785706 y-event 47.16565 event code2 rect Cont true
10-29 12:57:23.829: D/Touch(9532): rect (l,t,r,b) - 704,24,819,139 x-Event 49.785706 y-event 46.674835 event code2 rect Cont true
10-29 12:57:23.837: D/Touch(9532): rect (l,t,r,b) - 704,24,819,139 x-Event 49.785706 y-event 46.18405 event code2 rect Cont true
10-29 12:57:23.845: D/Touch(9532): rect (l,t,r,b) - 704,24,819,139 x-Event 49.785706 y-event 45.693237 event code2 rect Cont true
10-29 12:57:23.868: D/Touch(9532): rect (l,t,r,b) - 704,24,819,139 x-Event 49.785706 y-event 44.71164 event code2 rect Cont true
10-29 12:57:23.884: D/Touch(9532): rect (l,t,r,b) - 704,24,819,139 x-Event 49.785706 y-event 44.220856 event code2 rect Cont true
10-29 12:57:23.907: D/Touch(9532): rect (l,t,r,b) - 704,24,819,139 x-Event 49.785706 y-event 43.730072 event code2 rect Cont true
10-29 12:57:23.915: D/Touch(9532): rect (l,t,r,b) - 704,24,819,139 x-Event 49.785706 y-event 43.239258 event code2 rect Cont true
10-29 12:57:23.938: D/Touch(9532): rect (l,t,r,b) - 704,24,819,139 x-Event 49.785706 y-event 42.748474 event code2 rect Cont true
10-29 12:57:24.016: D/Touch(9532): rect (l,t,r,b) - 704,24,819,139 x-Event 49.785706 y-event 42.748474 event code2 rect Cont true
10-29 12:57:24.055: D/Touch(9532): rect (l,t,r,b) - 704,24,819,139 x-Event 49.785706 y-event 44.71164 event code2 rect Cont true
10-29 12:57:24.079: D/Touch(9532): rect (l,t,r,b) - 704,24,819,139 x-Event 49.785706 y-event 45.202454 event code2 rect Cont true
10-29 12:57:24.102: D/Touch(9532): rect (l,t,r,b) - 704,24,819,139 x-Event 49.785706 y-event 45.693237 event code2 rect Cont true
10-29 12:57:24.102: D/Touch(9532): rect (l,t,r,b) - 704,24,819,139 x-Event 49.785706 y-event 46.18405 event code2 rect Cont true
10-29 12:57:24.118: D/Touch(9532): rect (l,t,r,b) - 704,24,819,139 x-Event 49.785706 y-event 46.674835 event code2 rect Cont true
10-29 12:57:24.134: D/Touch(9532): rect (l,t,r,b) - 704,24,819,139 x-Event 49.785706 y-event 47.16565 event code2 rect Cont true
10-29 12:57:24.157: D/Touch(9532): rect (l,t,r,b) - 704,24,819,139 x-Event 49.785706 y-event 47.656433 event code2 rect Cont true
10-29 12:57:24.165: D/Touch(9532): rect (l,t,r,b) - 704,24,819,139 x-Event 49.785706 y-event 48.147247 event code2 rect Cont true
10-29 12:57:24.188: D/Touch(9532): rect (l,t,r,b) - 704,24,819,139 x-Event 48.914246 y-event 48.63803 event code2 rect Cont true
10-29 12:57:24.212: D/Touch(9532): rect (l,t,r,b) - 704,24,819,139 x-Event 48.914246 y-event 49.128845 event code2 rect Cont true
10-29 12:57:24.243: D/Touch(9532): rect (l,t,r,b) - 704,24,819,139 x-Event 48.914246 y-event 49.61963 event code2 rect Cont true
10-29 12:57:24.259: D/Touch(9532): rect (l,t,r,b) - 704,24,819,139 x-Event 48.914246 y-event 50.110413 event code2 rect Cont true
10-29 12:57:24.283: D/Touch(9532): rect (l,t,r,b) - 704,24,819,139 x-Event 48.914246 y-event 50.601227 event code2 rect Cont true
10-29 12:57:24.329: D/Touch(9532): rect (l,t,r,b) - 704,24,819,139 x-Event 48.914246 y-event 51.09201 event code2 rect Cont true
10-29 12:57:24.360: D/Touch(9532): rect (l,t,r,b) - 704,24,819,139 x-Event 48.042847 y-event 51.09201 event code2 rect Cont true
10-29 12:57:24.384: D/Touch(9532): rect (l,t,r,b) - 704,24,819,139 x-Event 48.042847 y-event 51.582825 event code2 rect Cont true
10-29 12:57:24.399: D/Touch(9532): rect (l,t,r,b) - 704,24,819,139 x-Event 48.042847 y-event 52.07361 event code2 rect Cont true
10-29 12:57:24.438: D/Touch(9532): rect (l,t,r,b) - 704,24,819,139 x-Event 48.042847 y-event 52.564423 event code2 rect Cont true
10-29 12:57:24.470: D/Touch(9532): rect (l,t,r,b) - 704,24,819,139 x-Event 48.042847 y-event 53.055206 event code2 rect Cont true
10-29 12:57:24.493: D/Touch(9532): rect (l,t,r,b) - 704,24,819,139 x-Event 48.042847 y-event 53.54602 event code2 rect Cont true
10-29 12:57:24.509: D/Touch(9532): rect (l,t,r,b) - 704,24,819,139 x-Event 48.042847 y-event 54.036804 event code2 rect Cont true
10-29 12:57:24.532: D/Touch(9532): rect (l,t,r,b) - 704,24,819,139 x-Event 48.042847 y-event 54.52762 event code2 rect Cont true
10-29 12:57:24.556: D/Touch(9532): rect (l,t,r,b) - 704,24,819,139 x-Event 48.042847 y-event 55.018402 event code2 rect Cont true
10-29 12:57:24.579: D/Touch(9532): rect (l,t,r,b) - 704,24,819,139 x-Event 48.042847 y-event 55.509186 event code2 rect Cont true
10-29 12:57:24.618: D/Touch(9532): rect (l,t,r,b) - 704,24,819,139 x-Event 48.042847 y-event 56.0 event code2 rect Cont true
10-29 12:57:24.815: D/Touch(9532): rect (l,t,r,b) - 704,24,819,139 x-Event 48.042847 y-event 56.490784 event code2 rect Cont true
10-29 12:57:26.274: D/Touch(9532): rect (l,t,r,b) - 704,24,819,139 x-Event 48.042847 y-event 56.490784 event code2 rect Cont true
10-29 12:57:26.306: D/Touch(9532): rect (l,t,r,b) - 704,24,819,139 x-Event 48.042847 y-event 56.490784 event code2 rect Cont true
10-29 12:57:26.391: D/Touch(9532): rect (l,t,r,b) - 704,24,819,139 x-Event 48.042847 y-event 56.490784 event code2 rect Cont true
10-29 12:57:27.446: D/Touch(9532): rect (l,t,r,b) - 704,24,819,139 x-Event 48.042847 y-event 54.52762 event code2 rect Cont true
10-29 12:57:30.548: D/Touch(9532): rect (l,t,r,b) - 704,24,819,139 x-Event 48.042847 y-event 54.036804 event code2 rect Cont true
10-29 12:57:41.118: D/Touch(9532): rect (l,t,r,b) - 704,24,819,139 x-Event 48.042847 y-event 54.036804 event code1 rect Cont true
10-29 12:57:42.720: D/dalvikvm(9532): GC_FOR_MALLOC freed 647K, 57% free 3123K/7239K, external 2941K/3417K, paused 80ms
10-29 12:57:42.727: I/dalvikvm-heap(9532): Grow heap (frag case) to 9.082MB for 1128458-byte allocation
10-29 12:57:42.774: D/dalvikvm(9532): GC_FOR_MALLOC freed <1K, 42% free 4225K/7239K, external 2941K/3417K, paused 35ms
10-29 12:57:42.860: D/dalvikvm(9532): GC_CONCURRENT freed 5K, 42% free 4226K/7239K, external 2941K/3417K, paused 2ms+5ms

私の質問は、この動作を防ぐためにどのようなオプションが必要ですか? とにかく一定期間ガベージコレクションを防ぐことはできますか?

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