1.判断进程是否存在

//判断是否在主进程,这个方法判断进程名或者pid都可以,如果进程名一样那pid肯定也一样
//true:当前进程是主进程 false:当前进程不是主进程
public boolean isUIProcess() {
 ActivityManager am = ((ActivityManager) getSystemService(Context.ACTIVITY_SERVICE));
 List<ActivityManager.RunningAppProcessInfo> processInfos = am.getRunningAppProcesses();
 String mainProcessName = getPackageName();
 int myPid = android.os.Process.myPid();
 for (ActivityManager.RunningAppProcessInfo info : processInfos) {
  if (info.pid == myPid && mainProcessName.equals(info.processName)) {
   return true;
  }
 }
 return false;
}

2.判断服务是否存在

/**
 * 判断service是否已经运行
 * 必须判断uid,因为可能有重名的Service,所以要找自己程序的Service,不同进程只要是同一个程序就是同一个uid,个人理解android系统中一个程序就是一个用户
 * 用pid替换uid进行判断强烈不建议,因为如果是远程Service的话,主进程的pid和远程Service的pid不是一个值,在主进程调用该方法会导致Service即使已经运行也会认为没有运行
 * 如果Service和主进程是一个进程的话,用pid不会出错,但是这种方法强烈不建议,如果你后来把Service改成了远程Service,这时候判断就出错了
 *
 * @param className Service的全名,例如PushService.class.getName()
 * @return true:Service已运行 false:Service未运行
 */

public boolean isServiceExisted(String className) {
 ActivityManager am = (ActivityManager) getSystemService(Context.ACTIVITY_SERVICE);
 List<ActivityManager.RunningServiceInfo> serviceList = am.getRunningServices(Integer.MAX_VALUE);
 int myUid = android.os.Process.myUid();
 for (ActivityManager.RunningServiceInfo runningServiceInfo : serviceList) {
  if (runningServiceInfo.uid == myUid && runningServiceInfo.service.getClassName().equals(className)) {
   return true;
  }
 }
 return false;
}

3.app是否在前台

是否在前台
 private boolean isAppForeground(String packageName) {
        ActivityManager am = (ActivityManager) getSystemService(Context.ACTIVITY_SERVICE);
        ComponentName cn = am.getRunningTasks(1).get(0).topActivity;
        String currentPackageName = cn.getPackageName();
        if (!TextUtils.isEmpty(currentPackageName) && currentPackageName.equals(packageName)) {
            return true;
        }

        return false;
    }

把应用置为前台
moveTaskToFront() 
moveTaskToBack()

 private void bring2Front() {
        ActivityManager activtyManager = (ActivityManager) getSystemService(Context.ACTIVITY_SERVICE);
        List<ActivityManager.RunningTaskInfo> runningTaskInfos = activtyManager.getRunningTasks(3);
        for (ActivityManager.RunningTaskInfo runningTaskInfo : runningTaskInfos) {
            if (this.getPackageName().equals(runningTaskInfo.topActivity.getPackageName())) {
                activtyManager.moveTaskToFront(runningTaskInfo.id, ActivityManager.MOVE_TASK_WITH_HOME);
                return;
            }
        }
    }

回到系统桌面
private void back2Home() {
        Intent home = new Intent(Intent.ACTION_MAIN);

        home.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        home.addCategory(Intent.CATEGORY_HOME);

        startActivity(home);
    }

4.手机锁

系统是否在锁屏状态
 private boolean isScreenLocked() {
        KeyguardManager keyguardManager = (KeyguardManager) getSystemService(Context.KEYGUARD_SERVICE);
        return keyguardManager.inKeyguardRestrictedInputMode();
    }
private void wakeAndUnlock() {
        //获取电源管理器对象
        PowerManager pm = (PowerManager) getSystemService(Context.POWER_SERVICE);

        //获取PowerManager.WakeLock对象，后面的参数|表示同时传入两个值，最后的是调试用的Tag
        PowerManager.WakeLock wl = pm.newWakeLock(PowerManager.ACQUIRE_CAUSES_WAKEUP | PowerManager.SCREEN_BRIGHT_WAKE_LOCK, "bright");

        //点亮屏幕
        wl.acquire(1000);

        //得到键盘锁管理器对象
        KeyguardManager km = (KeyguardManager) getSystemService(Context.KEYGUARD_SERVICE);
        kl = km.newKeyguardLock("unLock");

        //解锁
        kl.disableKeyguard();

    }

 private void release() {
        if (locked && kl != null) {
            android.util.Log.d("maptrix", "release the lock");
            //得到键盘锁管理器对象
            kl.reenableKeyguard();
            locked = false;
        }
    }

5.系统app

参考

参考
public void onclick(View view) {

        DataOutputStream dataOutputStream = null;


        BufferedReader err = null;

        try {

            //得到su权限
            Process process = Runtime.getRuntime().exec("su root");
            //输出命令
            dataOutputStream = new DataOutputStream(process.getOutputStream());
            //获取外部sd路径
            File externalStorageDirectory = Environment.getExternalStorageDirectory();
            //得到apk文件路径
            File apkFile = new File(externalStorageDirectory.getAbsoluteFile()+File.separator+"youjiayou.apk");
            //移动文件命令
            String command = "cp  " + apkFile.getAbsolutePath() + " system/app\n";
            //挂载为system可写 不然无法写入文件 = = 这些坑我是一点点 踩过的
            dataOutputStream.writeBytes("mount -o remount rw /system\n");
            //输出命令
            dataOutputStream.write(command.getBytes("UTF-8"));
            //挂载为可写不然无法生效
            dataOutputStream.writeBytes("chmod 777 /system/app/youjiayou.apk\n");
            //挂载为可读
            dataOutputStream.writeBytes("mount -o remount ro /system\n");

            //刷新输出
            dataOutputStream.flush();
            //重启
            dataOutputStream.writeBytes("reboot\n");
            //退出
            dataOutputStream.writeBytes("exit\n");
            //刷新输出
            dataOutputStream.flush();
            //等候命令结束
            process.waitFor();

            String line;

            String msg = "";

            //读取控制台返回的数据
            err = new BufferedReader(new InputStreamReader(process.getInputStream()));

            //读取数据
            while ((line = err.readLine()) != null) {
                msg += line;
            }

            Log.e("Fmy", "结果 " +msg);

        } catch (Exception e) {
//          e.printStackTrace();

            Log.e("Fmy", "发生异常" + e.getMessage());
        } finally {
            try {
                if (dataOutputStream != null) {
                    dataOutputStream.close();
                }

                if (err != null) {
                    err.close();
                }

            } catch (IOException e) {
                e.printStackTrace();
            }
        }


    }