Android-广播接收者简介

目   录

广播接收者简介

广播接收者入门

广播接收者的创建

 静态注册

动态注册

实战演练——拦截史迪仔电话

自定义广播

实战演练——拯救史迪仔

广播类型

实战演练——拦截史迪仔广播

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广播接收者简介

广播接收者入门

广播接收者的创建

package cn.lwx.broadcastreceiver;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;

public class MyReceiver extends BroadcastReceiver {

    @Override//在该方法中实现广播接收者的相关操作
    public void onReceive(Context context, Intent intent) {
        // TODO: This method is called when the BroadcastReceiver is receiving
        // an Intent broadcast.
        throw new UnsupportedOperationException("Not yet implemented");
    }
    
}

 静态注册

动态注册

package cn.lwx.broadcastreceiver;

import androidx.appcompat.app.AppCompatActivity;

import android.content.IntentFilter;
import android.os.Bundle;

public class MainActivity extends AppCompatActivity {

    private MyReceiver receiver;

    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        receiver = new MyReceiver();//ctrl+alt+f 快速将局部变量提升为 成员变量
        //实例化过滤器并设置要过滤的广播
        String action = "android.provider.Telephony.SMS_RECEIVED";
        IntentFilter intentFilter = new IntentFilter(action);
        registerReceiver(receiver, intentFilter);//注册广播
    }

    //当Activity销毁时，取消注册
    protected void onDestroy() {
        super.onDestroy();
        unregisterReceiver(receiver);
    }

}

实战演练——拦截史迪仔电话

项目工程---源码：https://gitee.com/lwx001/BroadcastReceiver

可用gitee直接拷贝。

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="cn.lwx.broadcastreceiver">

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <!--注册广播接收者-->
        <receiver
            android:name=".MyReceiver"
            android:enabled="true"
            android:exported="true">

            <intent-filter>
                <action android:name="android.intent.action.NEW_OUTGOING_CALL"/>
            </intent-filter>

        </receiver>

        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>
    <uses-permission android:name="android.permission.PROCESS_OUTGOING_CALLS"/>
</manifest>

自定义广播

实战演练——拯救史迪仔

广播类型

实战演练——拦截史迪仔广播