Question

我在activity onCreate方法中创建了Handler。这个Hanlder负责在10秒后拍摄屏幕截图。在run方法里面我使用了while（flag == true）并屏蔽了capture util flag == false，但这困扰了我的活动。我无法工作。由于活动被卡住，它会一次又一次地拍摄相同图像的屏幕。我如何使用我的屏幕和我正在做的处理程序在10秒后拍摄屏幕截图？ while循环卡住了我的应用程序。

它拍照但我无法处理我的活动。

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

    setContentView(R.layout.activity_main);
    flag = true;


    Handler handler = new Handler();
    handler.postDelayed(new Runnable() {

        @Override
        public void run() {

            while (flag == true) {
                String SCREENSHOTS_LOCATIONS = Environment
                        .getExternalStorageDirectory().toString() + "/re/";
                // Get root view
                View view = getWindow().getDecorView().getRootView();
                // Create the bitmap to use to draw the screenshot
                final Bitmap bitmap = Bitmap.createBitmap(view.getWidth(),
                        view.getHeight(), Bitmap.Config.ARGB_8888);
                final Canvas canvas = new Canvas(bitmap);

                // Get current theme to know which background to use
                final Theme theme = getTheme();
                final TypedArray ta = theme
                        .obtainStyledAttributes(new int[] { android.R.attr.windowBackground });
                final int res = ta.getResourceId(0, 0);
                final Drawable background = getResources().getDrawable(res);

                // Draw background
                background.draw(canvas);

                // Draw views
                view.draw(canvas);
                FileOutputStream fos = null;

                try {
                    final File sddir = new File(SCREENSHOTS_LOCATIONS);
                    if (!sddir.exists()) {
                        sddir.mkdirs();
                    }

                    fos = new FileOutputStream(SCREENSHOTS_LOCATIONS + x
                            + ".jpg");
                    x++;
                    if (fos != null) {
                        if (!bitmap.compress(Bitmap.CompressFormat.JPEG,
                                90, fos)) {
                            Log.d("ScreenShot", "Compress/Write failed");
                        }
                        fos.flush();
                        fos.close();
                    }
                } catch (Exception e) {

                }
            }
        }

    }, 1000);

}

Answer 1

也许尝试使用AsyncTask或其他线程。 postDelayed()函数附加到主UI线程并锁定您的应用程序，直到run()完成（这从未发生，因为flag永远不等于false，因此while循环变为无限？）。

以下是使用ScheduledThreadPoolExecutor的示例：

private ScheduledThreadPoolExecutor exec = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    setContentView(R.layout.activity_main);
    flag = true;

    exec = new ScheduledThreadPoolExecutor(5);
    long interval = (long) 10; // 10 seconds for you
    exec.scheduleAtFixedRate(new savePicTask(), 0, interval, TimeUnit.SECONDS);

}

class savePicTask implements Runnable {
    @Override
    public void run() {
        while (flag == true) {
            String SCREENSHOTS_LOCATIONS = Environment
                    .getExternalStorageDirectory().toString() + "/re/";
            // Get root view
            View view = getWindow().getDecorView().getRootView();
            // Create the bitmap to use to draw the screenshot
            final Bitmap bitmap = Bitmap.createBitmap(view.getWidth(),
                    view.getHeight(), Bitmap.Config.ARGB_8888);
            final Canvas canvas = new Canvas(bitmap);

            // Get current theme to know which background to use
            final Theme theme = getTheme();
            final TypedArray ta = theme
                    .obtainStyledAttributes(new int[] { android.R.attr.windowBackground });
            final int res = ta.getResourceId(0, 0);
            final Drawable background = getResources().getDrawable(res);

            // Draw background
            background.draw(canvas);

            // Draw views
            view.draw(canvas);
            FileOutputStream fos = null;

            try {
                final File sddir = new File(SCREENSHOTS_LOCATIONS);
                if (!sddir.exists()) {
                    sddir.mkdirs();
                }

                fos = new FileOutputStream(SCREENSHOTS_LOCATIONS + x
                        + ".jpg");
                x++;
                if (fos != null) {
                    if (!bitmap.compress(Bitmap.CompressFormat.JPEG, 90, fos)) {
                        Log.d("ScreenShot", "Compress/Write failed");
                    }
                    fos.flush();
                    fos.close();
                }
            } catch (Exception e) {

            }
        }
    }       
}

编辑1：除了我正在使用

之外，这段代码对我有用

numberOfSeconds = 0.5;
ScheduledThreadPoolExecutor exec = new ScheduledThreadPoolExecutor(5);
long interval = (long) (1000* numberOfSeconds); // numberOfSeconds = 10 for you
exec.scheduleAtFixedRate(new savePicTask(), 0, interval, TimeUnit.MILLISECONDS);

而不是拍摄截图我正在用相机拍照。所以我不确定为什么它不适合你。

Android屏幕截图处理程序

1 个答案: