如何访问在BroadcastReceivers的MainActivity（layout）中声明的“切换”按钮 [英] How to access Switch button that is declared in MainActivity(layout) in BroadcastReceivers

问题描述

我有一项任务，当飞行模式处于开/关状态时，我必须更改开关按钮的状态。

I have a task in which i have to change state of Switch button when airplane mode is ON/OFF.

我有一个主要活动，其中我声明了Switch Button，我想从BroadcastReceiver类更改开关的打开/关闭状态

I have a main activity in which i declared Switch Button and i want to Change the state on/off of Switch from BroadcastReceiver Class

Receiver

public class MyReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
    boolean isAirplaneModeOn = intent.getBooleanExtra("state", false);
    if(isAirplaneModeOn){
         What Should i do ?
    }
}
}

layout_main_activity

layout_main_activity

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout 
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.hp.broadcastthroughmanifest.MainActivity">

<Switch
    android:id="@+id/switch1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginTop="127dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    app:layout_constraintTop_toTopOf="parent"
    tools:layout_constraintLeft_creator="1"
    tools:layout_constraintRight_creator="1"
    tools:layout_constraintTop_creator="1" />
</android.support.constraint.ConstraintLayout>

推荐答案

尝试使用这样的事件总线一个，将事件发布到活动中。从活动中，当您收到事件时，可以更改开关的状态。
这样的事情：
-您的广播类：

Try using an event bus like this one to post the event to the activity. From the activity, when you receive the event, you change the state of the switch. Something like this: - Your broadcast class:

public class MyReceiver extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
        boolean isAirplaneModeOn = intent.getBooleanExtra("state", false);
        if(isAirplaneModeOn){
            EventBus.getDefault().post(new SwitchEvent());
        }
    }
}

活动分类：

public class YourActivity{
    //declare your switch

    @Override
    public void onCreate() {
        setContentView(R.layout.layout_main_activity);
        //initialize your switch
    }

    @Override
     public void onStart() {
        super.onStart();
        EventBus.getDefault().register(this);
    }

    @Override
    public void onStop() {
        super.onStop();
        EventBus.getDefault().unregister(this);
    }

    @Subscribe(threadMode = ThreadMode.MAIN)  
    public void onMessageEvent(SwitchEvent event) {
        //update your switch element
    }
}

事件的类别：

Public class SwitchEvent{
    public SwitchEvent(){
        //empty
    }
}

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