如何以编程方式拍摄截图?

我怎样才能截取手机屏幕的选定区域,而不是通过任何程序,而是从代码?


这是允许我的屏幕截图存储在SD卡上的代码,稍后用于任何您的需要:

首先,您需要添加一个适当的权限来保存文件:

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

这是代码(在Activity中运行):

private void takeScreenshot() {
    Date now = new Date();
    android.text.format.DateFormat.format("yyyy-MM-dd_hh:mm:ss", now);

    try {
        // image naming and path  to include sd card  appending name you choose for file
        String mPath = Environment.getExternalStorageDirectory().toString() + "/" + now + ".jpg";

        // create bitmap screen capture
        View v1 = getWindow().getDecorView().getRootView();
        v1.setDrawingCacheEnabled(true);
        Bitmap bitmap = Bitmap.createBitmap(v1.getDrawingCache());
        v1.setDrawingCacheEnabled(false);

        File imageFile = new File(mPath);

        FileOutputStream outputStream = new FileOutputStream(imageFile);
        int quality = 100;
        bitmap.compress(Bitmap.CompressFormat.JPEG, quality, outputStream);
        outputStream.flush();
        outputStream.close();

        openScreenshot(imageFile);
    } catch (Throwable e) {
        // Several error may come out with file handling or DOM
        e.printStackTrace();
    }
}

这就是你如何打开最近生成的图像:

private void openScreenshot(File imageFile) {
    Intent intent = new Intent();
    intent.setAction(Intent.ACTION_VIEW);
    Uri uri = Uri.fromFile(imageFile);
    intent.setDataAndType(uri, "image/*");
    startActivity(intent);
}

如果你想在片段视图中使用它,请使用:

View v1 = getActivity().getWindow().getDecorView().getRootView();

代替

View v1 = getWindow().getDecorView().getRootView();

takeScreenshot()函数上

注意

如果您的对话框包含表面视图,则此解决方案不起作用。 有关详细信息,请查看以下问题的答案:

Android采取表面视图的屏幕截图显示黑屏


调用此方法,传入您想要屏幕截图的最外层ViewGroup:

public Bitmap screenShot(View view) {
    Bitmap bitmap = Bitmap.createBitmap(view.getWidth(),
            view.getHeight(), Config.ARGB_8888);
    Canvas canvas = new Canvas(bitmap);
    view.draw(canvas);
    return bitmap;
}

注意:仅适用于固定电话

以编程方式,您可以像下面那样运行adb shell /system/bin/screencap -p /sdcard/img.png

Process sh = Runtime.getRuntime().exec("su", null,null);
OutputStream os = sh.getOutputStream();
os.write(("/system/bin/screencap -p " + "/sdcard/img.png").getBytes("ASCII"));
os.flush();
os.close();
sh.waitFor();    

然后将img.png作为Bitmap读取并根据需要使用。

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