android 起动APP时锁住(Lock apps)

android手机管家锁住其它APP,发现有点流氓,后台一个线程在不停的运行
大致的核心代码如下:起时在service中启动这个类,但做测试为图个方便直接在Activity中启动

package com.example.testsafe;


import android.content.Context;
import android.content.pm.ApplicationInfo;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.content.pm.PackageManager.NameNotFoundException;


public class ApkInfo extends ApplicationInfo{
 
 private String appname;
 private String pname;
 private String versionName;
 private int versionCode;
 private PackageInfo packageInfo;
 
 public static ApkInfo getInfoFromPackageName(String pkgName,
        Context mContext) {
    ApkInfo newInfo = new ApkInfo();
    try {
        PackageInfo p = mContext.getPackageManager().getPackageInfo(
                pkgName, PackageManager.GET_PERMISSIONS);


        newInfo.appname = p.applicationInfo.loadLabel(
                mContext.getPackageManager()).toString();
        newInfo.pname = p.packageName;
        newInfo.versionName = p.versionName;
        newInfo.versionCode = p.versionCode;
        newInfo.setPackageInfo(p);
    } catch (NameNotFoundException e) {
        e.printStackTrace();
        return null;
    }
    return newInfo;
 }


 public String getAppname() {
 return appname;
 }


 public void setAppname(String appname) {
 this.appname = appname;
 }


 public String getPname() {
 return pname;
 }


 public void setPname(String pname) {
 this.pname = pname;
 }


 public String getVersionName() {
 return versionName;
 }


 public void setVersionName(String versionName) {
 this.versionName = versionName;
 }


 public int getVersionCode() {
 return versionCode;
 }


 public void setVersionCode(int versionCode) {
 this.versionCode = versionCode;
 }


 public PackageInfo getPackageInfo() {
 return packageInfo;
 }


 public void setPackageInfo(PackageInfo packageInfo) {
 this.packageInfo = packageInfo;
 }
 
 
}

package com.example.testsafe;


import java.util.List;
import java.util.Timer;
import java.util.TimerTask;


import android.app.ActivityManager;
import android.app.ActivityManager.RunningAppProcessInfo;
import android.content.Context;
import android.content.Intent;
import android.content.pm.ApplicationInfo;


public class Safe {
 
 String lastFrontAppPkg = null;
 public void test(final Context mContext){
 Timer timer = new Timer();
 timer.scheduleAtFixedRate(new TimerTask() {
 
 @Override
 public void run() {
   ActivityManager activityManager = (ActivityManager) mContext.getSystemService(Context.ACTIVITY_SERVICE);
           List<RunningAppProcessInfo> appProcesses= activityManager.getRunningAppProcesses();
        for (RunningAppProcessInfo appProcess : appProcesses) {
            try {
            if (appProcess.importance == RunningAppProcessInfo.IMPORTANCE_FOREGROUND) {
            if (!lastFrontAppPkg.equals((String) appProcess.pkgList[0])) {
                ApkInfo apkInfo = ApkInfo.getInfoFromPackageName(appProcess.pkgList[0], mContext);
                if (apkInfo == null || (apkInfo.getPackageInfo().applicationInfo.flags & ApplicationInfo.FLAG_SYSTEM) == 1) {
                  // System app                                            
                    continue;
                        } else if (((apkInfo.getPackageInfo().versionName == null)) || (apkInfo.getPackageInfo().requestedPermissions == null)) {
                    //Application that comes preloaded with the device
                        continue;
                     } else {
                     lastFrontAppPkg = (String) appProcess.pkgList[0];
                     }
 //kill the app
 //Here do the pupop with password to launch the lastFrontAppPkg if the pass is correct
 if(lastFrontAppPkg.equals(mContext.getPackageName())){
 Intent intent = new Intent(mContext, MainActivity.class);
 intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
 mContext.startActivity(intent);
 }
 


            }  }
                 } catch (Exception e) {
                  //e.printStackTrace();
                }
        }  
 
 }
 }, 0, 100);
 }
 
}