安卓BroaCastReceiver学习实现接受飞行模式变化，并在应用中显示

超、凢脫俗 2022-05-26 04:57 249阅读 0赞

# BroaCastReceiver 安卓实现接受飞行模式变化，并在应用中显示 #

入门级博客，希望分享出来对新玩家（学生做课程实验）有点帮助，也给自己留下记录

直接开始：

新建了了一个Acitivity，在页面布局的中间显示一个TextView,通过TextView来显示当前手机飞行模式的状态。  
![初始状态][70]

xml代码如下

<?xml version="1.0" encoding="utf-8"?>
    <RelativeLayout 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">
        <TextView android:id="@+id/tv_show_msg" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="当前状态：飞行模式开启" android:textSize="18sp" android:layout_centerInParent="true" />
    </RelativeLayout>

--------------------

2.创建的内部类MyBroadReciver继承BroadReciver，重写了onReceive方法。在onReceive方法中对手机的飞行模式的改变进行监听。当飞行模式发生变化后通过toast和TextView的方式显示。

![状态变化][70 1]

![状态变化][70 2]

public class MyBroadReceiver extends BroadcastReceiver { 
            int airState = 0;
            private String TAG = "MyBroadReceiver";
            @Override
            public void onReceive(Context context, Intent intent) {
                if(intent.getAction().equals(Intent.ACTION_AIRPLANE_MODE_CHANGED)){
                    Bundle bundle = intent.getExtras();
                    if (bundle != null) {
                        airState = bundle.getInt("state");
                        Log.e(TAG, "飞行模式状态 1为开启状态，0为关闭状态 airState==" + airState);
                        if (airState == 0) {
                            switch (flag) {
                                case 1: // 飞行模式关闭
                                    Log.i(TAG, "关闭状态 airState=");
                                    toast("飞行模式状态关闭");
                                    tv_show_msg.setText("飞行模式状态关闭");
                                    flag = 0;
                                    break;
                                case 0: // 飞行模式开启
                                    Toast.makeText(context, "飞行模式状态开启", Toast.LENGTH_SHORT).show();
                                    Log.i(TAG, "开启状态 airState=" + airState);
                                    tv_show_msg.setText("飞行模式状态开启");
                                    flag = 1;
                                    break;
                            }
                        }
                    }
                }
            }
    
        }

最后在MainActivity中动态对广播接收器进行注册，并通过Intentfliter指定监听的广播。记得重新重写Ondestroy方法，取消注册广播接收器。

public class SevenActivity extends BaseActivity { 
        private MyBroadReceiver myBroadReceiver;
        private TextView tv_show_msg;
        private int flag = 0;
    
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_seven);
            tv_show_msg = findViewById(R.id.tv_show_msg);
    
            myBroadReceiver = new MyBroadReceiver();
            IntentFilter intentFilter = new IntentFilter(Intent.ACTION_AIRPLANE_MODE_CHANGED);
            registerReceiver(myBroadReceiver,intentFilter);
            ContentResolver cr = getContentResolver();
            //先判断当前手机飞行模式的状态 ，0为飞行处于关闭状态
            if(android.provider.Settings.System.getString(cr, Settings.System.AIRPLANE_MODE_ON).equals("0")){
                tv_show_msg.setText("飞行模式状态关闭");
                flag = 0;
            }else {
                tv_show_msg.setText("飞行模式状态开启");
                flag = 1;
            }
    
        }
        }

## 全部代码 ##

package com.byht.hu.androidtest.seventest;
    
    import android.content.BroadcastReceiver;
    import android.content.ContentResolver;
    import android.content.Context;
    import android.content.Intent;
    import android.content.IntentFilter;
    import android.provider.Settings;
    import android.support.v7.app.AppCompatActivity;
    import android.os.Bundle;
    import android.util.Log;
    import android.widget.TextView;
    import android.widget.Toast;
    
    import com.byht.hu.androidtest.BaseActivity;
    import com.byht.hu.androidtest.R;
    
    public class SevenActivity extends BaseActivity { 
        private MyBroadReceiver myBroadReceiver;
        private TextView tv_show_msg;
        private int flag = 0;
    
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_seven);
            tv_show_msg = findViewById(R.id.tv_show_msg);
    
            myBroadReceiver = new MyBroadReceiver();
            IntentFilter intentFilter = new IntentFilter(Intent.ACTION_AIRPLANE_MODE_CHANGED);
            registerReceiver(myBroadReceiver,intentFilter);
            ContentResolver cr = getContentResolver();
            //先判断当前手机飞行模式的状态 ，0为关闭飞行
            if(android.provider.Settings.System.getString(cr, Settings.System.AIRPLANE_MODE_ON).equals("0")){
                tv_show_msg.setText("飞行模式状态关闭");
                flag = 0;
            }else {
                tv_show_msg.setText("飞行模式状态开启");
                flag = 1;
            }
    
        }
    
        @Override
        protected void onDestroy() {
            super.onDestroy();
            unregisterReceiver(myBroadReceiver);
        }
    
        public class MyBroadReceiver extends BroadcastReceiver { 
            int airState = 0;
            private String TAG = "MyBroadReceiver";
            @Override
            public void onReceive(Context context, Intent intent) {
                if(intent.getAction().equals(Intent.ACTION_AIRPLANE_MODE_CHANGED)){
                    Bundle bundle = intent.getExtras();
                    if (bundle != null) {
                        airState = bundle.getInt("state");
                        Log.e(TAG, "飞行模式状态 1为开启状态，0为关闭状态 airState==" + airState);
                        if (airState == 0) {
                            switch (flag) {
                                case 1: // 飞行模式关闭
                                    Log.i(TAG, "关闭状态 airState=");
                                    toast("飞行模式状态关闭");
                                    tv_show_msg.setText("飞行模式状态关闭");
                                    flag = 0;
                                    break;
                                case 0: // 飞行模式开启
                                    Toast.makeText(context, "飞行模式状态开启", Toast.LENGTH_SHORT).show();
                                    Log.i(TAG, "开启状态 airState=" + airState);
                                    tv_show_msg.setText("飞行模式状态开启");
                                    flag = 1;
                                    break;
                            }
                        }
                    }
                }
            }
    
        }
    
    }

BaseActivity可以不要，直接用Toast.makeText(this,msg, Toast.LENGTH\_LONG).show();就好

[70]: /images/20220526/9466a8b52a81425bb81e4a1123cc9c88.png
[70 1]: /images/20220526/76c68fbe79eb4c8f8e2cdf2262bfe6d3.png
[70 2]: /images/20220526/568573ae62a847bc8f9f0f5b4d8dad59.png