Question

我正在尝试创建一个应用程序屏幕捕获一切顺利但捕获的结果是一个空文件，我该怎么做才能让我的应用程序正确地给出一个非空文件，请帮助我，谢谢。

这是我的代码：

MainActivity类：

public class MainActivity extends Activity{
    Utilities u = new Utilities();
    Context context;
    Handler ssHandler = new Handler();
    File input = new File(u.getExternalDirectory()+"/BootManager/screenshot.bmp");
    private String ssDir = u.getExternalDirectory()+"/DCIM/screens";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        context = getApplicationContext();
        File dcim = new File(u.getExternalDirectory()+"/DCIM");
        if(!dcim.exists())
            dcim.mkdir();
        File screens = new File(dcim+"/screens");
        if(!screens.exists())
            screens.mkdir();
        u.execCommand(context.getFilesDir().getAbsolutePath()+"/busybox chmod 777 /dev/graphics/fb0");
        takeScreenshot(3);
        finish();

    }

    void takeScreenshot(final int delay)
    {
        ssHandler.postDelayed(new Runnable()
        {
            public void run()
            {
                takescreenshot();
            }
        }, delay * 1000);
    }

    private void takescreenshot(){

        if(input.exists())
            input.delete();



        u.execCommand(context.getFilesDir().getAbsolutePath()+"/bootmanagerSS tryScreenshotClient");
        /*if(!input.exists()){
            @SuppressWarnings("unused")
            int i = ssl.takeScreenShot("/dev/graphics/fb0");
        }
        */


      converttoPNG();
        Toast.makeText( MainActivity.this, "screenshot_saved", Toast.LENGTH_LONG).show();

    }

    private void converttoPNG() {
        Bitmap bmp = null;
        Calendar c = Calendar.getInstance();
        int month = c.get(Calendar.MONTH) + 1;
        int minute = c.get(Calendar.MINUTE);
        String minutes = String.valueOf(minute);
            if(minutes.length() < 2){
                minutes = "0"+minutes;
              }
        String sDate = month + "-" + c.get(Calendar.DAY_OF_MONTH) + "-" + c.get(Calendar.YEAR) + "-" + c.get(Calendar.HOUR_OF_DAY) + "." + minutes;
        try {
             bmp = BitmapFactory.decodeStream(new FileInputStream(input));
            FileOutputStream fout = new FileOutputStream(ssDir+"/"+sDate+".jpg");
            bmp.compress(CompressFormat.JPEG, 100, fout);
            fout.close();


        } catch (FileNotFoundException e) {

            e.printStackTrace();
        } catch (IOException e) {

            e.printStackTrace();
        }
        input.delete();
        startMediaScanner(ssDir+"/"+sDate+".jpg");

    }

    private void startMediaScanner(String addedPicture)
    {
         sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, Uri.parse("file://"+ addedPicture)));
    }



    @Override
    public void onDestroy() {
        super.onDestroy();
    }


}

实用工具类中的

execCommand函数：

public Boolean execCommand(String command) 
    {
      Process process;
        try {
            Runtime rt = Runtime.getRuntime();
            process = rt.exec("su");
            DataOutputStream os = new DataOutputStream(process.getOutputStream()); 
            os.writeBytes(command + "\n");
            os.flush();
            os.writeBytes("exit\n");
            os.flush();
            process.waitFor();
            os.close();
        } catch (IOException e) {
           return false;
        } catch (InterruptedException e) {
           return false;
        }
        return true; 
    }

Answer 1

试试这个，它可能会给你一些建议。

public class GrabIt {
private GrabIt() {
}

public static Bitmap takeScreenshot(View view) {
    assert view.getWidth() > 0 && view.getHeight() > 0;
    Bitmap.Config config = Bitmap.Config.ARGB_8888;
    Bitmap bitmap = Bitmap.createBitmap(view.getWidth(), view.getHeight(), config);
    Canvas canvas = new Canvas(bitmap);
    view.draw(canvas);

    return bitmap;
}

}

应用程序截屏

1 个答案: