Android(安卓)判断程序前后台状态

package com.123.www

import java.util.List;

import android.app.ActivityManager;
import android.app.ActivityManager.RunningAppProcessInfo;
import android.app.Service;
import android.content.Context;
import android.content.Intent;
import android.os.IBinder;
import android.util.Log;

public class AppStatusService extends Service {
private static final String TAG = "[AppStatusService]";
private ActivityManager activityManager;
private String packageName;

@Override
public IBinder onBind(Intent intent) {
return null;
}

@Override
public void onStart(Intent intent, int startId) {
// TODO Auto-generated method stub
activityManager = (ActivityManager) this.getSystemService(Context.ACTIVITY_SERVICE);
packageName = this.getPackageName();
new Thread() {
public void run() {
try {
while (true) {
Thread.sleep(1000);
if (isAppOnForeground()) {
Log.i(TAG, "true");
} else {
Log.i(TAG, "false");
}
}
} catch (Exception e) {
e.printStackTrace();
}
}
}.start();

super.onStart(intent, startId);
}

private boolean isAppOnForeground() {

List<RunningAppProcessInfo> appProcesses = activityManager.getRunningAppProcesses();
if (appProcesses == null) return false;
for (RunningAppProcessInfo appProcess : appProcesses) {

if (appProcess.processName.equals(packageName)
&& appProcess.importance == RunningAppProcessInfo.IMPORTANCE_FOREGROUND) {
return true;
}
}
return false;
}

}

这是只能判断一个app 一个进程的情况，例如app当中调用Intent发送短信则会出现mms进程

修改后虽然反应不是很灵敏但是能用

public static boolean isAppOnForeground(Context context) {
ActivityManager activityManager = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
String packageName = context.getPackageName();
List<RecentTaskInfo> appTask = activityManager.getRecentTasks(1, 0);
if (appTask == null) return false;
if(appTask.get(0).baseIntent.toString().contains(packageName)){
return true;
}
return false;
}

<uses-permission android:name="android.permission.GET_TASKS"/> //manifest中加上权限

上面方法有时候在task中的activity切换时会出错，先修改为

List<RunningTaskInfo> runningTask = activityManager.getRunningTasks(1);

if(runningTask.get(0).baseActivity.toString().contains(packageName)){
return true;
}

继续修改：

public static boolean isOnForeground(Context context){ActivityManager manager = (ActivityManager)context.getSystemService(Context.ACTIVITY_SERVICE);List<RunningAppProcessInfo> runningAppProcesses = manager.getRunningAppProcesses();for(RunningAppProcessInfo processInf : runningAppProcesses){if(processInf.processName.equals(context.getPackageName())){if(processInf.importance == RunningAppProcessInfo.IMPORTANCE_FOREGROUND){return true;}else{return false;}}}return false;}

app当中调用Intent发送短信、打电话、按Home键 processInf.importance值为IMPORTANCE_PERCEPTIBLE

按back键退出程序processInf.importance值为IMPORTANCE_BACKGROUND

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