android - 如何从表面 View 创建和保存屏幕截图？

Question

我有一个应用程序，我希望能够捕获屏幕截图

这是我的代码:

public class Screenshot {

    private final View view;

    /** Create snapshots based on the view and its children. */
    public Screenshot(View root) {
            this.view = root;
    }

    /** Create snapshot handler that captures the root of the whole activity. */
    public Screenshot(Activity activity) {
            final View contentView = activity.findViewById(android.R.id.content);
            this.view = contentView.getRootView();
    }

    /** Take a snapshot of the view. */
    public Bitmap snap() {
            Bitmap bitmap = Bitmap.createBitmap(this.view.getWidth(), this.view.getHeight(), Config.ARGB_8888);
            Canvas canvas = new Canvas(bitmap);
            view.draw(canvas);
            return bitmap;
    }

但是surfaceView的内容保存为black.!!!

请帮帮我，谢谢...

Answer 1

我希望您使用过这里发布的解决方案 Get screenshot of surfaceView in Android

这东西在这里解释Take Screenshot of SurfaceView

SurfaceView 的表面独立于绘制 View 元素的表面。所以捕获View内容不会包含SurfaceView.........

我希望这个Taking screenshot programmatically doesnt capture the contents of surfaceVIew代码可以帮助你更多

public class Cam_View extends Activity implements SurfaceHolder.Callback {

    protected static final int CAPTURE_IMAGE_ACTIVITY_REQUEST_CODE = 0;
    private SurfaceView SurView;
    private SurfaceHolder camHolder;
    private boolean previewRunning;
    final Context context = this;
    public static Camera camera = null;
    private RelativeLayout CamView;
    private Bitmap inputBMP = null, bmp, bmp1;
    private ImageView mImage;

    @SuppressWarnings("deprecation")
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.camera);

        CamView = (RelativeLayout) findViewById(R.id.camview);//RELATIVELAYOUT OR 
                                                              //ANY LAYOUT OF YOUR XML

        SurView = (SurfaceView)findViewById(R.id.sview);//SURFACEVIEW FOR THE PREVIEW 
                                                        //OF THE CAMERA FEED
        camHolder = SurView.getHolder();                           //NEEDED FOR THE PREVIEW
        camHolder.addCallback(this);                               //NEEDED FOR THE PREVIEW
        camHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);//NEEDED FOR THE PREVIEW
        camera_image = (ImageView) findViewById(R.id.camera_image);//NEEDED FOR THE PREVIEW

        Button btn = (Button) findViewById(R.id.button1); //THE BUTTON FOR TAKING PICTURE

        btn.setOnClickListener(new OnClickListener() {    //THE BUTTON CODE
            public void onClick(View v) {
                  camera.takePicture(null, null, mPicture);//TAKING THE PICTURE
                                                         //THE mPicture IS CALLED 
                                                         //WHICH IS THE LAST METHOD(SEE BELOW)
            }
        });
    }

    @Override
    public void surfaceChanged(SurfaceHolder holder, int format, int width,//NEEDED FOR THE PREVIEW
        int height) {
        if(previewRunning) {
            camera.stopPreview();
        }
        Camera.Parameters camParams = camera.getParameters();
        Camera.Size size = camParams.getSupportedPreviewSizes().get(0);
        camParams.setPreviewSize(size.width, size.height);
        camera.setParameters(camParams);
        try {
            camera.setPreviewDisplay(holder);
            camera.startPreview();
            previewRunning=true;
        } catch(IOException e) {
            e.printStackTrace();
        }
    }

    public void surfaceCreated(SurfaceHolder holder) {                  //NEEDED FOR THE PREVIEW
        try {
            camera=Camera.open();
        } catch(Exception e) {
            e.printStackTrace();
            Toast.makeText(getApplicationContext(),"Error",Toast.LENGTH_LONG).show();
            finish();
        }
    }

    @Override
    public void surfaceDestroyed(SurfaceHolder holder) {             //NEEDED FOR THE PREVIEW
        camera.stopPreview();
        camera.release();
        camera=null;
    }

    public void TakeScreenshot(){    //THIS METHOD TAKES A SCREENSHOT AND SAVES IT AS .jpg
        Random num = new Random();
        int nu=num.nextInt(1000); //PRODUCING A RANDOM NUMBER FOR FILE NAME
        CamView.setDrawingCacheEnabled(true); //CamView OR THE NAME OF YOUR LAYOUR
        CamView.buildDrawingCache(true);
        Bitmap bmp = Bitmap.createBitmap(CamView.getDrawingCache());
        CamView.setDrawingCacheEnabled(false); // clear drawing cache
        ByteArrayOutputStream bos = new ByteArrayOutputStream(); 
        bmp.compress(CompressFormat.JPEG, 100, bos); 
        byte[] bitmapdata = bos.toByteArray();
        ByteArrayInputStream fis = new ByteArrayInputStream(bitmapdata);

        String picId=String.valueOf(nu);
        String myfile="Ghost"+picId+".jpeg";

        File dir_image = new  File(Environment.getExternalStorageDirectory()+//<---
                        File.separator+"Ultimate Entity Detector");          //<---
        dir_image.mkdirs();                                                  //<---
        //^IN THESE 3 LINES YOU SET THE FOLDER PATH/NAME . HERE I CHOOSE TO SAVE
        //THE FILE IN THE SD CARD IN THE FOLDER "Ultimate Entity Detector"

        try {
            File tmpFile = new File(dir_image,myfile); 
            FileOutputStream fos = new FileOutputStream(tmpFile);

            byte[] buf = new byte[1024];
            int len;
            while ((len = fis.read(buf)) > 0) {
                fos.write(buf, 0, len);
            }
            fis.close();
            fos.close();
            Toast.makeText(getApplicationContext(),
                           "The file is saved at :SD/Ultimate Entity Detector",Toast.LENGTH_LONG).show();
            bmp1 = null;
            camera_image.setImageBitmap(bmp1); //RESETING THE PREVIEW
            camera.startPreview();             //RESETING THE PREVIEW
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    private PictureCallback mPicture = new PictureCallback() {   //THIS METHOD AND THE METHOD BELOW
                                 //CONVERT THE CAPTURED IMAGE IN A JPG FILE AND SAVE IT

        @Override
        public void onPictureTaken(byte[] data, Camera camera) {

            File dir_image2 = new  File(Environment.getExternalStorageDirectory()+
                            File.separator+"Ultimate Entity Detector");
            dir_image2.mkdirs();  //AGAIN CHOOSING FOLDER FOR THE PICTURE(WHICH IS LIKE A SURFACEVIEW
                                  //SCREENSHOT)

            File tmpFile = new File(dir_image2,"TempGhost.jpg"); //MAKING A FILE IN THE PATH
                            //dir_image2(SEE RIGHT ABOVE) AND NAMING IT "TempGhost.jpg" OR ANYTHING ELSE
            try { //SAVING
                FileOutputStream fos = new FileOutputStream(tmpFile);
                fos.write(data);
                fos.close();
                //grabImage();
            } catch (FileNotFoundException e) {
                Toast.makeText(getApplicationContext(),"Error",Toast.LENGTH_LONG).show();
            } catch (IOException e) {
                Toast.makeText(getApplicationContext(),"Error",Toast.LENGTH_LONG).show();
            }

            String path = (Environment.getExternalStorageDirectory()+
                            File.separator+"Ultimate EntityDetector"+
                                                File.separator+"TempGhost.jpg");//<---

            BitmapFactory.Options options = new BitmapFactory.Options();//<---
                options.inPreferredConfig = Bitmap.Config.ARGB_8888;//<---
            bmp1 = BitmapFactory.decodeFile(path, options);//<---     *********(SEE BELOW)
            //THE LINES ABOVE READ THE FILE WE SAVED BEFORE AND CONVERT IT INTO A BitMap
            camera_image.setImageBitmap(bmp1); //SETTING THE BitMap AS IMAGE IN AN IMAGEVIEW(SOMETHING
                                        //LIKE A BACKGROUNG FOR THE LAYOUT)

            tmpFile.delete();
            TakeScreenshot();//CALLING THIS METHOD TO TAKE A SCREENSHOT
            //********* THAT LINE MIGHT CAUSE A CRASH ON SOME PHONES (LIKE XPERIA T)<----(SEE HERE)
            //IF THAT HAPPENDS USE THE LINE "bmp1 =decodeFile(tmpFile);" WITH THE METHOD BELOW

        }
    };

    public Bitmap decodeFile(File f) {  //FUNCTION BY Arshad Parwez
        Bitmap b = null;
        try {
            // Decode image size
            BitmapFactory.Options o = new BitmapFactory.Options();
            o.inJustDecodeBounds = true;

            FileInputStream fis = new FileInputStream(f);
            BitmapFactory.decodeStream(fis, null, o);
            fis.close();
            int IMAGE_MAX_SIZE = 1000;
            int scale = 1;
            if (o.outHeight > IMAGE_MAX_SIZE || o.outWidth > IMAGE_MAX_SIZE) {
                scale = (int) Math.pow(
                        2,
                        (int) Math.round(Math.log(IMAGE_MAX_SIZE
                                / (double) Math.max(o.outHeight, o.outWidth))
                                / Math.log(0.5)));
            }

            // Decode with inSampleSize
            BitmapFactory.Options o2 = new BitmapFactory.Options();
            o2.inSampleSize = scale;
            fis = new FileInputStream(f);
            b = BitmapFactory.decodeStream(fis, null, o2);
            fis.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return b;
    }
}          

也试试这个

public static Bitmap overlay(Bitmap bmp1,Bitmap bmp2) {
            Bitmap bmOverlay = Bitmap.createBitmap(bmp1.getWidth(), bmp1.getHeight(),      bmp1.getConfig());
            Canvas canvas = new Canvas(bmOverlay);
            canvas.drawBitmap(bmp1, 0,0, null);

            canvas.drawBitmap(bmp2, 0, 0, null);
            Log.i("bmOverlay.......",""+bmOverlay);
            bmp3=bmOverlay;
            return bmOverlay;
        }

           private void getScreen() {
            Toast.makeText(BookType1.this, "saved", Toast.LENGTH_SHORT).show();
              File myDir=new File("/sdcard/saved_images");
                myDir.mkdirs();
                Random generator = new Random();
                int n = 10000;
                n = generator.nextInt(n);
                String fname = "Image-"+ n +".png";
                File file = new File (myDir, fname);


            try 
            {

                FileOutputStream ostream = new FileOutputStream(file);
                bmp3.compress(CompressFormat.PNG, 100, ostream);


                ostream.close();
            } 
            catch (Exception e) 
            {
                e.printStackTrace();
            }
        }

你还可以浏览这些引用资料，这会给你更多的想法

How to capture screenshot of surfaceview with background

Taking screen shot of a SurfaceView in android

How to take a screenshot of Android's Surface View?

How to programmatically take a screenshot in Android?