android开发设置应用开机自启动（2）——并使应用实时保持在前台

对于开机自启动已经在上一篇文章中讲过了；对于使自己的应用实时保持在前台，主要就是开启一个线程实时监听处于前台的应用，如果不是自己的应用则把自己的应用放到前台来；

package com.example.alwaysfront;import android.content.BroadcastReceiver;import android.content.Context;import android.content.Intent;public class BooTBroadcastReceiver extends BroadcastReceiver {@Overridepublic void onReceive(Context context, Intent intent) {// TODO Auto-generated method stubif(intent.getAction().equals("android.intent.action.BOOT_COMPLETED")) {Intent newIntent = new Intent(context,OneMainActivity.class);newIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);context.startActivity(newIntent);}}}

package com.example.alwaysfront;import java.util.List;import android.app.Activity;import android.app.ActivityManager;import android.app.ActivityManager.RunningTaskInfo;import android.content.ComponentName;import android.content.Context;import android.content.Intent;import android.content.pm.PackageInfo;import android.content.pm.PackageManager;import android.content.pm.PackageManager.NameNotFoundException;import android.content.pm.ResolveInfo;import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.EditText;import android.widget.Toast;public class OneMainActivity extends Activity {private EditText et;private Button bt;private Button bt1;private Handler handler;public static boolean flag = true;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_one_main);et = (EditText) findViewById(R.id.et);bt = (Button) findViewById(R.id.bt);bt1 = (Button) findViewById(R.id.bt1);bt.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View arg0) {if(UtilPhone.isEmail(et.getText().toString().trim())) {Toast.makeText(OneMainActivity.this, "正确", Toast.LENGTH_SHORT).show();}else {Toast.makeText(OneMainActivity.this, "错误", Toast.LENGTH_SHORT).show();}}});bt1.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View arg0) {flag = false;}});handler = new MyHandler();Thread t = new Mythread();t.start();}class MyHandler extends Handler {@Overridepublic void handleMessage(Message msg) {super.handleMessage(msg);if(msg.what == 1) {ActivityManager am = (ActivityManager) OneMainActivity.this.getSystemService(Context.ACTIVITY_SERVICE);@SuppressWarnings("deprecation")List<RunningTaskInfo> tasks = am.getRunningTasks(1);if(!tasks.isEmpty()) {ComponentName topActivity = tasks.get(0).topActivity;if(!topActivity.getPackageName().equals(OneMainActivity.this.getPackageName())) {AppRunningINFront(OneMainActivity.this.getPackageName());}}}}}class Mythread extends Thread {@Overridepublic void run() {super.run();while(flag) {try {Thread.sleep(500);Message msg = handler.obtainMessage();msg.what = 1;handler.sendMessage(msg);} catch (InterruptedException e) {e.printStackTrace();}}}}private void AppRunningINFront(String packageName) {          PackageInfo pckageInfo;          try {          pckageInfo = getPackageManager().getPackageInfo(packageName, 0);              Intent resolveIntent = new Intent(Intent.ACTION_MAIN, null);              resolveIntent.setPackage(pckageInfo.packageName);              PackageManager manager = getPackageManager();              List<ResolveInfo> info = manager.queryIntentActivities(resolveIntent, 0);              ResolveInfo ri = info.iterator().next();              if (ri != null) {                  packageName = ri.activityInfo.packageName;                  String className = ri.activityInfo.name;                  Intent intent = new Intent(Intent.ACTION_MAIN);                  ComponentName cn = new ComponentName(packageName, className);                  intent.setComponent(cn);                  startActivity(intent);              }          } catch (NameNotFoundException e) {              e.printStackTrace();          }        }}

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"    package="com.example.alwaysfront"    android:versionCode="1"    android:versionName="1.0" >    <uses-sdk        android:minSdkVersion="8"        android:targetSdkVersion="21" />    <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />    <uses-permission android:name="android.permission.GET_TASKS" />        <application        android:allowBackup="true"        android:icon="@drawable/ic_launcher"        android:label="@string/app_name"        android:theme="@style/AppTheme" >        <activity            android:name=".OneMainActivity"            android:label="@string/app_name" >            <intent-filter>                <action android:name="android.intent.action.MAIN" />                <category android:name="android.intent.category.LAUNCHER" />            </intent-filter>        </activity>                <receiver android:name="com.example.houtaitoqiantai.BooTBroadcastReceiver" >      <intent-filter>          <action android:name="android.intent.action.BOOT_COMPLETED" />            <category android:name="android.intent.category.LAUNCHER" />      </intent-filter>  </receiver>            </application></manifest>