Android中截取当前屏幕的功能

该篇文章是说明在Android手机或平板电脑中如何实现截取当前屏幕的功能，并把截取的屏幕保存到SDCard中的某个目录文件夹下面。实现的代码如下：

/**
	 * 获取和保存当前屏幕的截图
	 */
	private void GetandSaveCurrentImage()  
	{  
	    //1.构建Bitmap  
	    WindowManager windowManager = getWindowManager();  
	    Display display = windowManager.getDefaultDisplay();  
	    int w = display.getWidth();  
	    int h = display.getHeight();  
	      
	    Bitmap Bmp = Bitmap.createBitmap( w, h, Config.ARGB_8888 );      
	      
	    //2.获取屏幕  
	    View decorview = this.getWindow().getDecorView();   
	    decorview.setDrawingCacheEnabled(true);   
	    Bmp = decorview.getDrawingCache();   
	    
	    String SavePath = getSDCardPath()+"/AndyDemo/ScreenImage";
	  
	    //3.保存Bitmap   
	    try {  
	        File path = new File(SavePath);  
	        //文件  
	        String filepath = SavePath + "/Screen_1.png";  
	        File file = new File(filepath);  
	        if(!path.exists()){  
	            path.mkdirs();  
	        }  
	        if (!file.exists()) {  
	            file.createNewFile();  
	        }  
	          
	        FileOutputStream fos = null;  
	        fos = new FileOutputStream(file);  
	        if (null != fos) {  
	            Bmp.compress(Bitmap.CompressFormat.PNG, 90, fos);  
	            fos.flush();  
	            fos.close();    
	              
	            Toast.makeText(mContext, "截屏文件已保存至SDCard/AndyDemo/ScreenImage/下", Toast.LENGTH_LONG).show();  
	        }  
	  
	    } catch (Exception e) {  
	        e.printStackTrace();  
	    }  
	}  
	
    /**
     * 获取SDCard的目录路径功能
     * @return
     */
	private String getSDCardPath(){
		File sdcardDir = null;
		//判断SDCard是否存在
		boolean sdcardExist = Environment.getExternalStorageState().equals(android.os.Environment.MEDIA_MOUNTED);
		if(sdcardExist){
			sdcardDir = Environment.getExternalStorageDirectory();
		}
		return sdcardDir.toString();
	}

由于要对SDCard进行操作，所以别忘记了在manifest.xml文件中赋以对SDCard的读写权限：

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>