超简单实现Android(安卓)屏幕截屏（需要系统级权限）

1.思路 通过cmd 命令 :adb shell screencap -p /sdcard/screen.png 来实现

2.添加系统签名及权限

    android:sharedUserId="android.uid.system"

3.创建命令工具类：CmdUtil

import android.support.annotation.NonNull;import android.text.TextUtils;import android.util.Log;import java.io.BufferedReader;import java.io.DataOutputStream;import java.io.IOException;import java.io.InputStreamReader;public class CmdUtil {    private static final String TAG = "CmdUtil";    private static final String COMMAND_SH = "sh";    private static final String COMMAND_EXIT = "exit\n";    private static final String COMMAND_LINE_END = "\n";    /**     * 运行命令     *     * @param command 命令     * @return 结果     */    public static Result execute(String command) {        Log.i(TAG, "execute() command = " + command);        Result result = new Result();        if (TextUtils.isEmpty(command)) {            Log.w(TAG, "WARNING: command should not be null or empty");            return result;        }        Process process = null;        DataOutputStream dos = null;        try {            process = Runtime.getRuntime().exec(COMMAND_SH);            dos = new DataOutputStream(process.getOutputStream());            dos.write(command.trim().getBytes());            dos.writeBytes(COMMAND_LINE_END);            dos.flush();            dos.writeBytes(COMMAND_EXIT);            dos.flush();            result.code = process.waitFor();            result.success = readBuffer(new BufferedReader(new InputStreamReader(process.getInputStream())));            result.error = readBuffer(new BufferedReader(new InputStreamReader(process.getErrorStream())));            Log.i(TAG, "result = " + result);        } catch (IOException ioe) {            ioe.printStackTrace();            Log.e(TAG, ioe.getMessage());        } catch (InterruptedException ie) {            ie.printStackTrace();            Log.e(TAG, ie.getMessage());        } finally {            try {                if (null != dos) {                    dos.close();                }            } catch (IOException ioe) {                ioe.printStackTrace();                Log.e(TAG, ioe.getMessage());            }            if (null != process) {                process.destroy();            }        }        return result;    }    @NonNull    private static String readBuffer(BufferedReader bufferedReader) throws IOException {        StringBuilder sb = new StringBuilder();        String s;        while ((s = bufferedReader.readLine()) != null) {            sb.append(s);        }        return sb.toString();    }    /**     * Command执行结果     */    public static final class Result {        public static final int SUCCESS = 0;        public static final int ERROR = -1;        public int code = ERROR;        String error;        String success;        @Override        public String toString() {            return "Result{" +                "code=" + code +                ", error='" + error + '\'' +                ", success='" + success + '\'' +                '}';        }    }}

4.简单实现

 CmdUtil.execute(" screencap -p /data/screen1.png");

5.导出查看即可（或者指定其他路径）

adb pull /data/screen1.png ./

另附上两个很好的截屏demo：
参考Google官方给的demo以及其他开发者写的Demo

https://github.com/googlesamples/android-ScreenCapture
https://github.com/VincentWYJ/CaptureScreen

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