设备需要ROOT，利用Socket读取screencap向标准输出里输出的图像数据获取图片，图片格式为png。

import java.io.BufferedInputStream;

import java.io.IOException;

import java.io.InputStream;

import java.io.UnsupportedEncodingException;

import android.util.Log;

/**

* 截图工具类

* @author Jzhung

* @date 2016-7-13 17:25:18

*/

public class ScreenCaptureUtil {

private static ScreenCaptureUtil instance;

private byte[] tempBuffer;

private StringBuilder buffer;

private ScreenCaptureUtil(){

}

public static ScreenCaptureUtil getInstance(){

if(instance == null){

instance = new ScreenCaptureUtil();

instance.tempBuffer = new byte[100 * 1024];

instance.buffer = new StringBuilder(100 * 1024);

}

return instance;

}

/**

* 调用系统截图工具获取屏幕截图字节数组，格式为png，注意这是一个耗时操作，约为1-5秒。

* 如果屏幕分辨率过高，防止内存溢出，可以考虑直接保存到文件的命令u -c /system/bin/screencap -p /sdcard/screenshot.png

* @return png格式图片的字节数组

*/

public byte[] getScreenCapBytes(){

//LogUtils.i("获取屏幕图片bytes");

try {

Process exec = Runtime.getRuntime().exec("su -c /system/bin/screencap -p");

try {

final InputStream inputStream = exec.getInputStream();

BufferedInputStream bufferedInputStream = new BufferedInputStream(inputStream);

//清空缓存内容

buffer.setLength(0);

int count;

long start = System.currentTimeMillis();

while ((count = bufferedInputStream.read(tempBuffer)) > 0) {

//Log.e("test", "count = " + count);

buffer.append(new String(tempBuffer, 0, count, "ISO-8859-1"));

}

Log.v("test", "获取截屏耗时:" +(System.currentTimeMillis() - start) + "ms png图片大小: " + buffer.length());

bufferedInputStream.close();

//Log.e("test", "result: " + buffer.toString());

//exec.getOutputStream().close();

final int retCode = exec.waitFor();

exec.destroy();

//Log.e("test", "retCode: " + retCode);

} catch (final IOException | InterruptedException e) {

e.printStackTrace();

}

} catch (IOException e) {

e.printStackTrace();

}

try {

tempBuffer = buffer.toString().getBytes("ISO-8859-1");

} catch (UnsupportedEncodingException e) {

e.printStackTrace();

}

return tempBuffer;

}

}