基础篇1.8 BroadcastReceiver

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基础篇1.8  BroadcastReceiver

一、Android广播接收器简介

1、  用于接收sendBroadcast()传输过来的intent对象。

2、  注册一个BroadcastReceiver有两种方式。通过Context.registerReceiver()动态注册一个实例。或者在AndroidManifest.xml中通过<receiver>标签静态化一个实现。

3、  如图：

二、注册BroadcastReceiver

1、  在AndroidManifest.xml中进行注册。

（1）      在AndroidManifest.xml中注册的receiver在任何时候都会被执行，即使应用程序关闭。

（2）      应用举例：

AndroidManifest.xml：

<?xml version="1.0"encoding="utf-8"?>

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

    package="com.solidwang.broadcast"

    android:versionCode="1"

    android:versionName="1.0">

    <uses-sdk

        android:minSdkVersion="9"

        android:targetSdkVersion="9"/>

    <application

        android:allowBackup="true"

        android:icon="@drawable/ic_launcher"

        android:label="@string/app_name"

        android:theme="@style/AppTheme">

        <activity

            android:name="com.solidwang.broadcast.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>

        <receiver android:name=".TestReceiver1">

            <intent-filter>

                <action android:name="android.intent.action.DATE_CHANGED"/>

            </intent-filter>

        </receiver>

        <receiver android:name=".TestReceiver2">

            <intent-filter>

                <action android:name="android.intent.action.DATE_CHANGED"/>

            </intent-filter>

        </receiver>

    </application>

</manifest>

 

 

MainActivity：

public classMainActivity extends Activity {

private Button myButton;

@Override

protected void onCreate(BundlesavedInstanceState) {

           super.onCreate(savedInstanceState);

           setContentView(R.layout.main);

           myButton = (Button)findViewById(R.id.myButton);

           myButton.setOnClickListener(newBroadcastListener());

}

class BroadcastListener implementsOnClickListener {

           @Override

           public void onClick(View v) {

                    Intent intent = newIntent();

                    intent.setAction(Intent.ACTION_DATE_CHANGED);

                    MainActivity.this.sendBroadcast(intent);

           }

}

}

 

TestReceiver1：

public classTestReceiver1 extends BroadcastReceiver {

@Override

public void onReceive(Context context, Intentintent) {

           System.out.println("onReceive.............1");

}

}

 

TestReceiver2:

public classTestReceiver2 extends BroadcastReceiver {

@Override

public void onReceive(Context context, Intentintent) {

           System.out.println("onReceive.............2");

}

}

 

运行结果：

点击“发送广播”后，调用receiver1和receiver2中的onReceive方法。

 

2、  在应用程序的代码中进行注册。

（1）      如果一个BroadcastReceiver用于更新UI，那么通常会使用这种方法进行注册，在Activity启动的时候进行注册，在Activity不见时，取消注册。

（2）      应用举例：

MainActivity：

public class MainActivity extends Activity {

private Button registerBtn;

private Button unregisterBtn;

private SMSReceiver smsReceiver;

private staticfinalString SMS_ACTION= "android.provider.Telephony.SMS_RECEIVED";

@Override

protected voidonCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);

    setContentView(R.layout.main);

    registerBtn = (Button)findViewById(R.id.registerBtn);

    registerBtn.setOnClickListener(new RegisterListener());

    unregisterBtn = (Button) findViewById(R.id.unregisterBtn);

    unregisterBtn.setOnClickListener(new UnRegisterListener());

}

//注册receiver

class RegisterListener implements OnClickListener {

    @Override

    public voidonClick(View v) {

       smsReceiver = newSMSReceiver();

       IntentFilter filter = new IntentFilter();

       filter.addAction(SMS_ACTION);

       MainActivity.this.registerReceiver(smsReceiver, filter);

    }

}

//取消注册receiver

class UnRegisterListener implements OnClickListener {

    @Override

    public voidonClick(View v) {

       MainActivity.this.unregisterReceiver(smsReceiver);

    }

}

}

                  

SMSReceiver：

public classSMSReceiver extends BroadcastReceiver {

 

  @Override

  public void onReceive(Context context, Intentintent) {

     System.out.println("smsreceiver");

  }

}

 

AndroidManifest.xml：

<?xml version="1.0"encoding="utf-8"?>

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

    package="com.solidwang.broadcast_02"

    android:versionCode="1"

    android:versionName="1.0" >

   <uses-sdk

        android:minSdkVersion="10"

        android:targetSdkVersion="10" />

   <uses-permission android:name="android.permission.RECEIVE_SMS" />

   <application

        android:allowBackup="true"

        android:icon="@drawable/ic_launcher"

        android:label="@string/app_name"

        android:theme="@style/AppTheme" >

        <activity

           android:name="com.solidwang.broadcast_02.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>

   </application>

</manifest>

 

运行结果：

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