01_21_广播机制（一）.

01_21_广播机制（一）

//TestActivity.java
package mars.testbc;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class TestActivity extends Activity {
    /** Called when the activity is first created. */
    private Button sendButton;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.testreceiver);
        sendButton = (Button)findViewById(R.id.sendButton);
        sendButton.setOnClickListener(new BroadcastListener());
    }
    /*发送广播
     * 1、创建一个Intent对象：intent = new Intent
     * 2、设置广播动作intent.setAction(ITent.ACTION_EDIT)
     * 3、发送广播：TestActivity.this.sendBroadcast(intent)*/
    class BroadcastListener implements OnClickListener{

        @Override
        public void onClick(View v) {
            System.out.println("Click --- button ");
            Intent intent = new Intent();
            intent.setAction(Intent.ACTION_EDIT);
            TestActivity.this.sendBroadcast(intent);
        }
        /*注意：上面的intent.setAction(Intent.ACTION_EDIT);和
         * AndroidMainfext.xml中的是对应的




        */
    }
}

//TestReceiver.java
package mars.testbc;

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

/*TestReceiver继承了BroadcastReceiver并复写了onReceive()方法
 *
 * 处理广播消息*/
public class TestReceiver extends BroadcastReceiver{

    public TestReceiver(){
        System.out.println("TestReceiver");
    }
    @Override
    public void onReceive(Context context, Intent intent) {
        System.out.println("onReceive");
    }
}

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android=""
    package="mars.testbc" android:versionCode="1" android:versionName="1.0">
    <application android:icon="@drawable/icon" android:label="@string/app_name">
        <activity android:name=".TestActivity" android:label="@string/app_name">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <receiver android:name=".TestReceiver">
            <intent-filter>
                <action android:name="android.intent.action.EDIT" />
            </intent-filter>
        </receiver>
    </application>
    <uses-sdk android:minSdkVersion="4" />
    <uses-permission android:name="android.permission.RECEIVE_SMS"></uses-permission>
</manifest>

结果如下：（从结果可知每次广播信息均重新生成TestReceiver并调用onReceive方法）
04-10 12:31:55.597: I/System.out(511): Click --- button 
04-10 12:31:55.706: I/System.out(511): TestReceiver
04-10 12:31:55.706: I/System.out(511): onReceive
04-10 12:31:59.567: I/System.out(511): Click --- button 
04-10 12:31:59.607: I/System.out(511): TestReceiver
04-10 12:31:59.607: I/System.out(511): onReceive