Android-如何以编程方式获取屏幕截图

Avadhani Y 发表于 Dev

阿瓦达尼Y

我需要每200毫秒在后台安装并运行我的应用程序时，以编程方式对Android设备或模拟器的屏幕截图进行截图，并将图像保存在计算机中。我已经使用下面的代码实现了此过程，并且仅在我的应用程序处于前台时才起作用。我也想在我的应用程序处于后台时拍摄屏幕截图。下面是我的代码：

public static Bitmap takeScreenshot(Activity activity, int ResourceID) { 
    Random r = new Random();
    int iterator=r.nextInt();   
     String mPath = Environment.getExternalStorageDirectory().toString() + "/screenshots/";
    View v1 = activity.getWindow().getDecorView().findViewById(ResourceID);
    v1.measure(MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED), 
            MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED));
    v1.layout(0, 0, v1.getMeasuredWidth(), v1.getMeasuredHeight()); 
    v1.setDrawingCacheEnabled(true);
    final Bitmap bitmap = Bitmap.createBitmap(v1.getDrawingCache());
    Bitmap resultBitmap = Bitmap.createScaledBitmap(bitmap, 640, 480, false);
    v1.setDrawingCacheEnabled(false);
    File imageFile = new File(mPath);
    imageFile.mkdirs();
    imageFile = new File(imageFile+"/"+iterator+"_screenshot.png");
    try {
        ByteArrayOutputStream bos = new ByteArrayOutputStream();
        resultBitmap.compress(CompressFormat.PNG, 100, bos);
        byte[] bitmapdata = bos.toByteArray();

        //write the bytes in file
        FileOutputStream fos = new FileOutputStream(imageFile);
        fos.write(bitmapdata);
        fos.flush();
        fos.close();    
    } catch (FileNotFoundException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }
    return bitmap;
    }

如何以Devices -> DDMS编程方式实现Screencapture的“刷新”和“保存”按钮的功能？我能做到吗？

维斯瓦纳特·莱克希玛南（Viswanath Lekshmanan）

如果您的手机已扎根，请尝试此操作

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读取为位图，并将其转换为jpg，如下所示

Bitmap screen = BitmapFactory.decodeFile(Environment.getExternalStorageDirectory()+         
File.separator +"img.png");

//my code for saving
    ByteArrayOutputStream bytes = new ByteArrayOutputStream();
    screen.compress(Bitmap.CompressFormat.JPEG, 15, bytes);

//you can create a new file name "test.jpg" in sdcard folder.

File f = new File(Environment.getExternalStorageDirectory()+ File.separator + "test.jpg");
            f.createNewFile();
//write the bytes in file
    FileOutputStream fo = new FileOutputStream(f);
    fo.write(bytes.toByteArray());
// remember close de FileOutput

    fo.close();