android基础：broadcast广播简单实例

main.xml

<RelativeLayout 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"    tools:context="com.mytest.testbroadcast.MainActivity" >    <EditText        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:hint="@string/param_input"         android:id="@+id/param_input"/>    <Button        android:id="@+id/send_button"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_toRightOf="@id/param_input"        android:text="@string/send_button"        android:onClick="SendBroadCast" />             <TextView        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_below="@id/param_input"        android:text="@null"        android:id="@+id/view_result"       />        </RelativeLayout>

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AndroidMainFest.xml

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"    package="com.mytest.testbroadcast"    android:versionCode="1"    android:versionName="1.0" >    <uses-sdk        android:minSdkVersion="14"        android:targetSdkVersion="21" />    <application        android:allowBackup="true"        android:icon="@drawable/ic_launcher"        android:label="@string/app_name"        android:theme="@style/AppTheme" >        <activity            android:name=".MainActivity"            android:label="@string/app_name" >            <intent-filter>                <action android:name="android.intent.action.MAIN" />                <category android:name="android.intent.category.LAUNCHER" />            </intent-filter>        </activity>        <!-- 注册广播接收类 -->        <receiver android:name=".MyBroadCastReceiver">            <intent-filter>                <action android:name="com.mytest.testbroad.intent"/>            </intent-filter>                    </receiver>    </application></manifest>

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MainActivity.java 发送广播

package com.mytest.testbroadcast;import android.app.Activity;import android.content.Intent;import android.os.Bundle;import android.view.Menu;import android.view.MenuItem;import android.view.View;import android.widget.EditText;import android.widget.TextView;import android.widget.Toast;public class MainActivity extends Activity {        private EditText paramText;    private TextView resultView;    private final String ACTION_INTENT_TEST="com.mytest.testbroad.intent";    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);                paramText = (EditText) this.findViewById(R.id.param_input);        resultView = (TextView) this.findViewById(R.id.view_result);    }        /**     * 发送广播按钮onclick事件     * @param view     */    public void SendBroadCast(View view){        String param = paramText.getText().toString();                //创建发送intent        Intent intent = new Intent(this.ACTION_INTENT_TEST);        //绑定参数        intent.putExtra("user_input", param);        //发送广播        this.sendBroadcast(intent);                 resultView.setText("发送广播成功，参数值为:"+param);                    }    }

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MyBroadCastReceiver接收广播

package com.mytest.testbroadcast;import android.content.BroadcastReceiver;import android.content.Context;import android.content.Intent;import android.widget.Toast;public class MyBroadCastReceiver extends BroadcastReceiver {    @Override    public void onReceive(Context context, Intent intent) {        // TODO Auto-generated method stub        String user_input = intent.getStringExtra("user_input");        Toast.makeText(context,"接收到广播，得到参数值为"+user_input,Toast.LENGTH_SHORT).show();            }}

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案例实现小结：
1、定义ACTION,并建立发送Intent，调用sendBroadcast方法发送广播；
2、创建广播接收类。类要继承BroadcastReceiver，并重写onReceive方法；
3、在AndroidManifest.xml中注册广播接收对象，在intent-filter中添加ACTION。

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