判断App是否处于前台

方法一：

//当前应用是否处于前台
private boolean isForeground(Context context) {
if (context != null) {
ActivityManager am = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
ComponentName cn = am.getRunningTasks(1).get(0).topActivity;
String currentPackageName = cn.getPackageName();
if (!TextUtils.isEmpty(currentPackageName) && currentPackageName.equals(context.getPackageName())) {
return true;
}
return false;
}
return false;
}

需要权限：<uses-permission Android:name ="android.permission.GET_TASKS"/>

方法二：

//版本4.0以上，可以使用ActivityLifecycle, 在Application的onCreate()当中：
if (Build.VERSION.SDK_INT >= 14) {
lifecycle = new SimpleActivityLifecycle();
registerActivityLifecycleCallbacks(lifecycle);
}
public class SimpleActivityLifecycle implements Application.ActivityLifecycleCallbacks {
private boolean isForeground = false;//应用是否处于前端
@Override
public void onActivityCreated(Activity activity, Bundle savedInstanceState) {
}
@Override
public void onActivityStarted(Activity activity) {
}
@Override
public void onActivityResumed(Activity activity) {
isForeground = true;
}
@Override
public void onActivityPaused(Activity activity) {
isForeground = false;
}
@Override
public void onActivityStopped(Activity activity) {
}
@Override
public void onActivitySaveInstanceState(Activity activity, Bundle outState) {
}
@Override
public void onActivityDestroyed(Activity activity) {
}
public boolean isForeground() {
return isForeground;
}
}

最后

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