broadcastReceiver广播基础demo介绍

broadcastReceiver开发步骤:

1  创建需要启动的BroadcastReceiver的Intent

2  调用context中的sendBroadcast或者sendOrderedBroadcast()方法来启动指定的广播接受者（BroadcastReceiver)

需要注意的是：当应用程序发出一个boradcastReceiver Intent时，所有匹配了该Intent的广播接受者都有可能被启动，具体的启动方式和顺序可以由我们设定。

创建andriod项目

创建layout布局代码如下

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:tools="http://schemas.android.com/tools"

    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"

    android:orientation="vertical"

    tools:context=".MainActivity" >

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:id="@+id/main_bt1"

        android:text="启动无序广播" />

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:id="@+id/main_bt2"

        android:text="启动有序广播" />

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:id="@+id/main_bt3"

        android:text="动态注册广播" />

新建java类activity活动代码

package com.example.android_lession9_1;

import android.os.Bundle;

import android.app.Activity;

import android.content.BroadcastReceiver;

import android.content.Context;

import android.content.Intent;

import android.content.IntentFilter;

import android.util.Log;

import android.view.Menu;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

public class MainActivity extends Activity {

private Button bt1,bt2,bt3;

private MyBroadcast my;   //声明内部广播

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

my=new MyBroadcast();//实例化内部广播

//动态注册广播

MainActivity.this.registerReceiver(my, new IntentFilter("com.zyy.lession9_1_mydongbroadcast"));

bt1=(Button) findViewById(R.id.main_bt1);

bt3=(Button) findViewById(R.id.main_bt3);

bt1.setOnClickListener(new OnClickListener() {

@Override

public void onClick(View v) {

//点击发送无序广播

Intent t=new Intent("com.zyy.lession9_1_mybroadcast");

t.putExtra("key1", "abc");

MainActivity.this.sendBroadcast(t);

}

});

bt2=(Button) findViewById(R.id.main_bt2);

    bt2.setOnClickListener(new OnClickListener() {

@Override

public void onClick(View v) {

//点击发送有序广播

Intent i=new Intent("com.zyy.lession9_1_myorderbroadcast");

i.putExtra("key2", "隔壁老王");

//发送有序广播

MainActivity.this.sendOrderedBroadcast(i,null);

}

});

 bt3.setOnClickListener(new OnClickListener() {

@Override

public void onClick(View v) {

//发送动态广播

Intent i=new Intent("com.zyy.lession9_1_mydongbroadcast");

MainActivity.this.sendBroadcast(i);

}

});

}

@Override

public boolean onCreateOptionsMenu(Menu menu) {

// Inflate the menu; this adds items to the action bar if it is present.

getMenuInflater().inflate(R.menu.main, menu);

return true;

}

//内部类广播不能注册在清单文件中,只能采用动态注册方式

public  class  MyBroadcast extends BroadcastReceiver{

@Override

public void onReceive(Context context, Intent intent) {

Log.d("zyy", "进入了内部广播");

}

}

}

新建三个广播代码

1.

package com.example.android_lession9_1;

import android.content.BroadcastReceiver;

import android.content.Context;

import android.content.Intent;

import android.util.Log;

public class MyBroadCast extends BroadcastReceiver{

@Override

public void onReceive(Context context, Intent intent) {

Log.d("zyy", context.toString());

Log.d("zyy", intent.getStringExtra("key1"));

}

}

2。

package com.example.android_lession9_1;

import android.content.BroadcastReceiver;

import android.content.Context;

import android.content.Intent;

import android.os.Bundle;

import android.util.Log;

public class MyOrderBroadCast extends BroadcastReceiver{

@Override

public void onReceive(Context context, Intent intent) {

// TODO Auto-generated method stub

String str=intent.getStringExtra("key2");

Log.d("zyy", "从main传递过来的值是"+str);

str="隔壁老y";

Bundle b=new Bundle();

b.putString("key3", str);

setResultExtras(b);

//中止传播广播

//abortBroadcast();

}

}

3.

package com.example.android_lession9_1;

import android.content.BroadcastReceiver;

import android.content.Context;

import android.content.Intent;

import android.util.Log;

public class MyOrderBroadCast2 extends BroadcastReceiver{

@Override

public void onReceive(Context context, Intent intent) {

String str=intent.getStringExtra("key2");

String str2=getResultExtras(true).getString("key3");

Log.d("zyy", "从main获取的值是"+str);

Log.d("zyy", "从上一个广播发送过来的值获取的值是"+str2);

}

}

四配置清单文件

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

    package="com.example.android_lession9_1"

    android:versionCode="1"

    android:versionName="1.0" >

        android:minSdkVersion="8"

        android:targetSdkVersion="17" />

        android:allowBackup="true"

        android:icon="@drawable/ic_launcher"

        android:label="@string/app_name"

        android:theme="@style/AppTheme" >

            android:name="com.example.android_lession9_1.MainActivity"

            android:label="@string/app_name" >