广播Broadcast，收发步骤

来源：互联网发布：怎么在淘宝上买彩票了编辑：程序博客网时间：2024/05/21 09:27

转载请注明出处：http://blog.csdn.net/mr_leixiansheng/article/details/53583161

步骤：

1、新建自己的广播类继承BroadcastReceiver并重写onReceive（一旦广播接收到设定接收的信息就会启动onReceive）

2、在Manifest中对广播注册声明（静态注册，此处就可以设置广播接收的信息）

3、主程序中发送要接受的信息，触发广播机制

1、自定义广播

package com.example.leixiansheng.test3;import android.content.BroadcastReceiver;import android.content.Context;import android.content.Intent;import android.widget.Toast;/** * Created by Leixiansheng on 2017/3/15. */public class MyBroadcast extends BroadcastReceiver {    @Override    public void onReceive(Context context, Intent intent) {        String str = intent.getExtras().get("CONTENT").toString();        Toast.makeText(context, str, Toast.LENGTH_SHORT).show();    }}

2、注册

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"    package="com.example.leixiansheng.test3">    <application        android:allowBackup="true"        android:icon="@mipmap/ic_launcher"        android:label="@string/app_name"        android:supportsRtl="true"        android:theme="@style/AppTheme">        <activity android:name=".MainActivity">            <intent-filter>                <action android:name="android.intent.action.MAIN" />                <category android:name="android.intent.category.LAUNCHER" />            </intent-filter>        </activity>        <receiver android:name=".MyBroadcast">            <intent-filter>                <action android:name="com.example.leixiansheng.test3.MyBroadcast"/>            </intent-filter>        </receiver>    </application></manifest>

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:id="@+id/activity_main"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:paddingBottom="@dimen/activity_vertical_margin"    android:paddingLeft="@dimen/activity_horizontal_margin"    android:paddingRight="@dimen/activity_horizontal_margin"    android:paddingTop="@dimen/activity_vertical_margin"    tools:context="com.example.leixiansheng.test3.MainActivity">    <Button        android:id="@+id/btn"        android:text="发送广播"        android:layout_width="match_parent"        android:layout_height="wrap_content" /></RelativeLayout>

package com.example.leixiansheng.test3;import android.content.Intent;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.View;import android.widget.Button;public class MainActivity extends AppCompatActivity {    private Button send;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        send = (Button) findViewById(R.id.btn);        send.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View view) {                Intent intent = new Intent("com.example.leixiansheng.test3.MyBroadcast");                intent.putExtra("CONTENT","这是广播内容");                sendBroadcast(intent);            }        });    }}

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