Android入门之动态BroadCast的使用教程

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools">
 
    <application
        android:allowBackup="true"
        android:dataExtractionRules="@xml/data_extraction_rules"
        android:fullBackupContent="@xml/backup_rules"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/Theme.DemoDynamicBroadCast"
        tools:targetApi="31">
        <receiver
            android:name=".SimpleBroadCast"
            android:enabled="true"
            android:exported="true"></receiver>
 
        <activity
            android:name=".MainActivity"
            android:exported="true">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
 
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
 
            <meta-data
                android:name="android.app.lib_name"
                android:value="" />
        </activity>
    </application>
 
</manifest>

package org.mk.android.demo.broadcast;
 
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.util.Log;
import android.widget.Toast;
 
public class SimpleBroadCast extends BroadcastReceiver {
 
    private final static String TAG="DemoDynamicBroadCast";
    @Override
    public void onReceive(Context context, Intent intent) {
        Toast.makeText(context,"网络状态发生改变~",Toast.LENGTH_SHORT).show();
        Log.i(TAG,">>>>>>网络状态发生改变");
    }
}

package org.mk.android.demo.broadcast;
 
import androidx.appcompat.app.AppCompatActivity;
 
import android.content.IntentFilter;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
 
public class MainActivity extends AppCompatActivity {
    SimpleBroadCast simpleBroadCast;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        //核心部分代码：
        simpleBroadCast = new SimpleBroadCast();
        IntentFilter itFilter = new IntentFilter();
        itFilter.addAction("android.net.conn.CONNECTIVITY_CHANGE");
        registerReceiver(simpleBroadCast, itFilter);
    }
    //别忘了将广播取消掉哦~
    @Override
    protected void onDestroy() {
        super.onDestroy();
        unregisterReceiver(simpleBroadCast);
    }
}