Android判断应用程序退到后台的方法(示例代码)

/**
* 程序是否在前台运行
*
*/
public boolean isAppOnForeground() {
 
ActivityManager activityManager = (ActivityManager) getApplicationContext()
.getSystemService(Context.ACTIVITY_SERVICE);
String packageName = getApplicationContext().getPackageName();
/**
* 获取Android设备中所有正在运行的App
*/
List<ActivityManager.RunningAppProcessInfo> appProcesses = activityManager
.getRunningAppProcesses();
if (appProcesses == null)
return false;
 
for (ActivityManager.RunningAppProcessInfo appProcess : appProcesses) {
// The name of the process that this object is associated with.
if (appProcess.processName.equals(packageName)
&& appProcess.importance == ActivityManager.RunningAppProcessInfo.IMPORTANCE_FOREGROUND) {
return true;
}
}
 
return false;
}

@Override
protected void onPause() {
super.onPause();
if(!isAppOnForeground()){
Toast.makeText(getApplicationContext(), TAG+"onPause:",
Toast.LENGTH_SHORT).show();
}else {
sendBroadcast(new Intent(NotificationIntentReceiver.ACTION_ENABLE_MESSAGES)
.setClass(this, NotificationIntentReceiver.class));
Toast.makeText(getApplicationContext(), TAG+"后台运行1",
Toast.LENGTH_SHORT).show();
}
}

int countActivity = 0;

@Override
public void onActivityStarted(Activity activity) {
countActivity++;
}

@Override
public void onActivityStopped(Activity activity) {
countActivity--;
L.i("onActivityStopped", "countActivity=" + countActivity);
if (countActivity <= 0) {
if (WDRTCSysConfig.getInstance().isCalling()) {
Intent _intent = new Intent(WDBroadcastReceiver.ACTION_ENABLE_MESSAGES);
_intent.setClass(getApplicationContext(), WDBroadcastReceiver.class);
sendBroadcast(_intent);
}
 
}
 
}

public class DemoApplication extends Application implements Application.ActivityLifecycleCallbacks{
@Override
public void onCreate() {
super.onCreate();
//全局管理Activity生命周期
registerActivityLifecycleCallbacks(this);
}
 
@Override
public void onActivityCreated(Activity activity, Bundle bundle) {
 
}
 
@Override
public void onActivityStarted(Activity activity) {
 
}
 
@Override
public void onActivityResumed(Activity activity) {
 
}
 
@Override
public void onActivityPaused(Activity activity) {
 
}
 
@Override
public void onActivityStopped(Activity activity) {
 
}
 
@Override
public void onActivitySaveInstanceState(Activity activity, Bundle bundle) {
 
}
 
@Override
public void onActivityDestroyed(Activity activity) {
 
}
}