小賴的實戰記錄

我要做一個，按按鈕後，能夠將現有的螢幕截取下來，

網路已有文章解決這個問題

https://androidresearch.wordpress.com/2013/01/06/taking-a-screenshot-of-current-activity-in-android/

 

實際實作後，覺得缺少一個部份，除了截取螢幕下來以外，為了讓我們能夠在Gallery能看得見，

所以還需要傳送檔案位置給Gallery，讓他知道，以便我們能夠Gallery能查看結果。

 

以下是實作的程式碼。

 

	
	public void initScreenCapture() {
	    Button mBtnScreenCapture;
		mBtnScreenCapture = (Button)this.findViewById(R.id.btn_screen_capture);
		
		mBtnScreenCapture.setOnClickListener(new OnClickListener() {
			@Override
			public void onClick(View v) {
				Bitmap bitmap = takeScreenshot();
			    saveBitmap(bitmap);
			}			
		});
	}
	
	public Bitmap takeScreenshot() {
	    View rootView = findViewById(android.R.id.content).getRootView();
	    rootView.setDrawingCacheEnabled(true);
	    return rootView.getDrawingCache();
    }
	
	public void saveBitmap(Bitmap bitmap) {
		SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd-hh-mm-ss");
		String fileName = sdf.format(new Date());
	    File imagePath = new File(getAblumDir() + "/screenshot_"+fileName+".png");
	    
	    FileOutputStream fos;
	    try {
	        fos = new FileOutputStream(imagePath);
	        bitmap.compress(CompressFormat.JPEG, 100, fos);
	        fos.flush();
	        fos.close();
	        sendBroadcaseAddPhotoToGallery(this,imagePath.getAbsolutePath()); 
	    } catch (FileNotFoundException e) {
	        Log.e("GREC", e.getMessage(), e);
	    } catch (IOException e) {
	        Log.e("GREC", e.getMessage(), e);
	    }
	}
	
    public static File getAblumDir() {
        File albumDir = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES), "screenCapturemDemo");
        
        // Create the storage directory if it does not exist.
        if (! albumDir.exists()){
            if (!albumDir.mkdirs()) {
                // Log.e(TAG, "PiActivity: App album directory failed to create !!");
            }
        }
        
        return albumDir;
    }
    
    /**
     * Add photo to gallery
     * @param path
     */
    public void sendBroadcaseAddPhotoToGallery(Context ctx,String path) {        
        Intent mediaScanIntent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);
        Uri contentUri = Uri.fromFile(new File(path));
        mediaScanIntent.setData(contentUri);
        ctx.sendBroadcast(mediaScanIntent);
    }