[移动开发]17 广播

一、系统广播

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1、动态广播
 

package com.test;

import android.app.Activity;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.net.ConnectivityManager;
import android.net.Network;
import android.net.NetworkInfo;
import android.os.Bundle;
import android.widget.Toast;

import androidx.annotation.Nullable;

import com.example.textmethod.R;

public class BCActivity extends Activity {
    NETchange neTchange;


    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.new_main);
        neTchange =new NETchange();
        IntentFilter intentFilter=new IntentFilter();
        intentFilter.addAction("android.net.conn.CONNECTIVITY_CHANGE");
        registerReceiver(neTchange,intentFilter);
    

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