Android读取/dev/graphics/fb0 屏幕截图

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Android屏幕截图有很多方式这里只使用其中一种截图

主要是读取/dev/graphics/fb0,进行转换，复杂点就在如何把读取的数据进行转换。

可以参考一下这篇文章：http://blog.chinaaet.com/detail/28298

下面给出程序代码

/** * ScreenShotFb.java * 版权所有(C) 2014 * 创建者:cuiran 2014-4-3 下午4:55:23 */package com.ghyf.mplay.util;import java.io.DataInputStream;import java.io.File;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;import com.ghyf.mplay.value.ConstantValue;import android.app.Activity;import android.graphics.Bitmap;import android.graphics.PixelFormat;import android.util.DisplayMetrics;import android.view.Display;/** * FrameBuffer中获取Android屏幕截图  * @author cuiran * @version 1.0.0 */public class ScreenShotFb {private static final String TAG="ScreenShotFb";final static String FB0FILE1 = "/dev/graphics/fb0";static File fbFile;  //程序入口      public static  void shoot(){       try {       /************ 创建锁对象 ************/            final Object lock = new Object();                    synchronized (lock) {        long start=System.currentTimeMillis();        Bitmap bitmap=getScreenShotBitmap();            long end=System.currentTimeMillis();            LogUtil.i(TAG, "getScreenShotBitmap time is :"+(end-start)+" ms");            String filePath= ConstantValue.ROOT_SDCARD_DIR+"/s.png";//            String filePath= ConstantValue.ROOT_SDCARD_DIR+"/screens/"+System.currentTimeMillis()+".png";            ScreenShotFb.savePic(bitmap,filePath);          }         }catch (Exception e) {           LogUtil.e(TAG, "Exception error",e);         }              }   //保存到sdcard  public static void savePic(Bitmap b,String strFileName){          FileOutputStream fos = null;          try {              fos = new FileOutputStream(strFileName);              if (null != fos)              {                  b.compress(Bitmap.CompressFormat.PNG, 50, fos);                  fos.flush();                  fos.close();              }          } catch (FileNotFoundException e) {          LogUtil.e(TAG, "FileNotFoundException error",e);        } catch (IOException e) {          LogUtil.e(TAG, "IOException error",e);        }                  LogUtil.i(TAG, "savePic success");    }   public static void init(Activity activity){  try {DisplayMetrics dm = new DisplayMetrics();Display display = activity.getWindowManager().getDefaultDisplay();display.getMetrics(dm);screenWidth = dm.widthPixels; // 屏幕宽（像素，如：480px）screenHeight = dm.heightPixels; // 屏幕高（像素，如：800p）int pixelformat = display.getPixelFormat();PixelFormat localPixelFormat1 = new PixelFormat();PixelFormat.getPixelFormatInfo(pixelformat, localPixelFormat1);int deepth = localPixelFormat1.bytesPerPixel;// 位深LogUtil.i(TAG, "deepth="+deepth);piex = new byte[screenHeight * screenWidth*deepth] ;// 像素colors = new int[screenHeight * screenWidth];}catch(Exception e){LogUtil.e(TAG, "Exception error",e);} } static DataInputStream dStream=null; static byte[] piex=null; static int[] colors =null; static int screenWidth; static int screenHeight; public static synchronized Bitmap getScreenShotBitmap() {FileInputStream buf = null;try {fbFile = new File(FB0FILE1);buf = new FileInputStream(fbFile);// 读取文件内容dStream=new DataInputStream(buf);dStream.readFully(piex);dStream.close();// 将rgb转为色值  for(int i=0;i<piex.length;i+=2)            {  colors[i/2]= (int)0xff000000 +                        (int) (((piex[i+1]) << (16))&0x00f80000)+                        (int) (((piex[i+1]) << 13)&0x0000e000)+                        (int) (((piex[i]) << 5)&0x00001A00)+                        (int) (((piex[i]) << 3)&0x000000f8);            }       // 得到屏幕bitmapreturn Bitmap.createBitmap(colors, screenWidth, screenHeight,    Bitmap.Config.RGB_565);} catch (FileNotFoundException e) {LogUtil.e(TAG, "FileNotFoundException error",e);} catch (IOException e) {LogUtil.e(TAG, "IOException error",e);}catch (Exception e) {LogUtil.e(TAG, "Exception error",e);}  finally {if(buf!=null){try {buf.close();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}return null;}  }

调用时候需要先init 然后在shoot

看到很多朋友咨询得到的数据花屏和数组越界

这里跟设备的设备的位深和像素有关需要修改这些代码。
// 将rgb转为色值
for(int i=0;i<piex.length;i+=2)
{
colors[i/2]= (int)0xff000000 +
(int) (((piex[i+1]) << (16))&0x00f80000)+
(int) (((piex[i+1]) << 13)&0x0000e000)+
(int) (((piex[i]) << 5)&0x00001A00)+
(int) (((piex[i]) << 3)&0x000000f8);
}

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