安卓 - 如何以编程方式截取屏幕截图

android java

2022-09-03 04:44:41

我需要以编程方式在应用程序安装并在后台运行每 200 毫秒一次 Android 设备或模拟器的屏幕截图，并将图像保存在计算机中。我已经使用以下代码实现了此过程，并且仅在我的应用程序处于前台时才起作用。当我的应用程序也在后台时，我也想截取屏幕截图。以下是我的代码：

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;
    }

如何以编程方式实现屏幕截图的“刷新”和“保存”按钮的功能？我能做到这一点吗？Devices -> DDMS

答案 1

如果您的手机已植根，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读作位图并将其转换为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();

如果您的应用程序在后台，则无法访问屏幕，除非您已植根，否则即使您处于后台，上面的代码也可以最有效地截取任何屏幕的屏幕截图。

更新

谷歌有一个库，你可以用它来截图而不生根，我试过了，但我确信它会尽快耗尽内存。

试用 http://code.google.com/p/android-screenshot-library/

答案 2

这是做到这一点的方法。

安卓通过代码拍摄屏幕截图

结果输出：

enter image description here

public class CaptureScreenShots extends Activity {
    LinearLayout L1;
    ImageView image;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.screen_shots);
         L1 = (LinearLayout) findViewById(R.id.LinearLayout01);
            Button but = (Button) findViewById(R.id.munchscreen);
            but.setOnClickListener(new OnClickListener() {

                @Override
                public void onClick(View v) {
                    View v1 = L1.getRootView();
                    v1.setDrawingCacheEnabled(true);
                    Bitmap bm = v1.getDrawingCache();
                    BitmapDrawable bitmapDrawable = new BitmapDrawable(bm);
                    image = (ImageView) findViewById(R.id.screenshots);
                    image.setBackgroundDrawable(bitmapDrawable);
                }
            });
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.screen_shots, menu);
        return true;
    }

}