本篇内容主要讲解“Android切换前后台点击通知进入当前页面怎么实现”，感兴趣的朋友不妨来看看。本文介绍的方法操作简单快捷，实用性强。下面就让小编来带大家学习“Android切换前后台点击通知进入当前页面怎么实现”吧!
首先,先展示效果,有图才有真相
效果如上图,当我们按下back键或者HOME键的时候.程序退到后台,弹出通知,点开通知回到当前页面. 在上节中,我有讲述到判断程序退到后台的两种方式. 第一种方式:在BaseActivity中onPause方法中判断程序退出后台之后,进入广播页面:
public class BaseActivity extends AppCompatActivity {
private static final String TAG = "BaseActivity";
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
AppManager.getInstance().addActivity(this);
}
@Override
protected void onPause() {
super.onPause();
if(!isAppOnForeground()){
Toast.makeText(getApplicationContext(), TAG+"onPause:",
Toast.LENGTH_SHORT).show();
}else {
Log.e(TAG, "onPause: "+"弹出通知");
//第一种方式退到后台
Intent _intent = new Intent(DemoBroadcastReceiver.ACTION_NOTIFY_MESSAGE);
_intent.setClass(getApplicationContext(), DemoBroadcastReceiver.class);
sendBroadcast(_intent);
}
}第二种方式,在Application中中onStopActivity方法中判断程序退出后台之后,进入广播页面:
@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);
}
}
}不管是方法一或者 方法 二:都是进入广播服务中,进行判断然后弹出Notification通知出来.主要代码如下:
@Override
public void onReceive(Context context, Intent intent) {
switch (intent.getAction()) {
case ACTION_NOTIFY_MESSAGE:
String name = null;
String avatar = null;
//方法一:从系统的Stack中拿到当前的Activity
/* ActivityManager mActivityManager = ((ActivityManager) context.getApplicationContext()
.getSystemService(Context.ACTIVITY_SERVICE));
List<ActivityManager.RunningTaskInfo> taskInfos = mActivityManager.getRunningTasks(1);
Class<?> _class = taskInfos.get(0).topActivity.getClass();
*/
//方法二:从AppManger的Stack中拿到当前的Activity
Class<?> _class = AppManager.getInstance().currentActivity().getClass();
if (_class != null) {
if (null != reflectionActivity()) {
//拿到反射的数据
Bundle _bundle = reflectionActivity();
if (_bundle != null) {
name = _bundle.getString("name");
avatar = _bundle.getString("avatar");
}
}
NotificationUtils _notifyUtils = NotificationUtils.getInstance();
_notifyUtils.init(context.getApplicationContext(), _class);
_notifyUtils.showNotification("从" + name + "退出到后台");
}
break;
}
}注意上面代码:有两种方式拿到当前的Activity. 这两个这里先简单介绍,后面详细解释 稍微注意下第21行:这里主要通过反射拿到当前Activity要传给通知栏显示的信息,; 而通知栏的主要代码如下:没什么好解释的
public void showNotification(@NonNull String contentText){
PendingIntent _pendingIntent = PendingIntent.getActivity(mContext, notifId, mNotificationIntent,
PendingIntent.FLAG_UPDATE_CURRENT);
NotificationCompat.Builder builder = new NotificationCompat.Builder(mContext);
builder.setLargeIcon(BitmapFactory.decodeResource(mContext.getResources(),R.mipmap.ic_launcher))
.setSmallIcon(R.mipmap.ic_launcher)
.setContentTitle("通知测试")
.setContentText(contentText)
.setSubText(mContext.getString(R.string.notice_click_into))
.setPriority(Notification.PRIORITY_HIGH)
.setVibrate(new long[]{0, 0, 0, 10})
//.setFullScreenIntent(_pendingIntent, true)
.setContentIntent(_pendingIntent);
//在什么状态下显示通知,比如锁屏状态
if (Build.VERSION.SDK_INT >= 21) {
builder.setVisibility(Notification.VISIBILITY_PUBLIC);
builder.setCategory(Notification.CATEGORY_MESSAGE);
}
mNotification = builder.build();
mNotificationManager.notify(notifId, mNotification);
}关于怎样获取当前的Activity,这里是主要的关键,这里我使用了两种方法: 方法二: 我自己手动建立了一个Activity的Stack的工具栏,然后对Activity进行增删操作处理,主要代码如下:
public class AppManager {
private static AppManager instance;
private static Stack<Activity> activityStack;
public static AppManager getInstance() {
if (instance == null) {
//懒汉双层锁,保证线程安全
synchronized (AppManager.class) {
if (instance == null) {
instance = new AppManager();
}
}
}
return instance;
}
/**
* 添加Activity到stack中
*/
public void addActivity(Activity activity) {
if (activityStack == null) {
activityStack = new Stack<>();
}
if (activityStack.contains(activity)) {
activityStack.remove(activity);
}
activityStack.add(activity);
}
/**
* 获取stack中当前的Activity
*/
public Activity currentActivity() {
if (null != activityStack && null != activityStack.lastElement()) {
return activityStack.lastElement();
}
return null;
}
/**
* 移除当前的Activity
*/
public void finishActivity() {
if (null != activityStack && null != activityStack.lastElement()) {
finishActivity(activityStack.lastElement());
}
}
}这是一个单例,然后在BaseActivity的onCreate中调用Add方法,在Activity要finish的时候,调用这里的finishActivity方法,而CurrentActivity就是我们需要的当前的Activity;
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
AppManager.getInstance().addActivity(this);
}另外还有一种方式就是获取当前Activity的方法,就是程序系统本身就有一个Stack的,我们可以通过管理 ActivityManager. getRunningTasks(1) 来拿到当前的Activity,这是我在网上看到的.
ActivityManager mActivityManager = ((ActivityManager) _app
.getSystemService(Context.ACTIVITY_SERVICE));
List<RunningTaskInfo> taskInfos = mActivityManager.getRunningTasks(1);
Class<?> intentActivity = taskInfos.get(0).topActivity.getClass();