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Android四大组件之BroadcastReceiver

时间:2016-02-18 17:57:52      阅读:220      评论:0      收藏:0      [点我收藏+]

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(1)BroadcastReceiver的两种注册方式

     当我们创建了一个继承于BroadcastReceiver的广播接收者类以后,要在程序中去注册,注册的第一种方式是xml方式,在Mainfest注册文件中去注册,注册的xml代码如下

<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>
        <receiver android:name="MyReceiver">
            <intent-filter>
                <action android:name="dengchaoqun.Reciever"/>
            </intent-filter>
        </receiver>
    </application>

  然后再程序中发送广播

Intent intent=new Intent("dengchaoqun.Reciever");
sendBroadcast(intent);

(2)通过java代码动态注册

private Button btnStart;
    private Button btnStop;
    private BroadcastReceiver receiver;
    
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        //动态方式注册BordCastrecever
        receiver=new MyReceiver();
        IntentFilter filter=new IntentFilter("Myreceiver");
        registerReceiver(receiver, filter);
        
        btnStart=(Button) findViewById(R.id.button1);
        btnStop=(Button)findViewById(R.id.button2);
        
        btnStart.setOnClickListener(new View.OnClickListener() {
            
            @Override
            public void onClick(View v) {
                //静态方式
                /*Intent intent=new Intent("dengchaoqun.Reciever");
                sendBroadcast(intent);*/
                Intent intent=new Intent("Myreceiver");
                sendBroadcast(intent);
            }
        });
        
        btnStop.setOnClickListener(new View.OnClickListener() {
            
            @Override
            public void onClick(View v) {
                unregisterReceiver(receiver);
            }
        });
    }

(3)接收者对象的销毁  unregisterReciever(receiver);

(4)在接收者对象中的

@Override
public void onReceive(Context context, Intent intent) {
Toast.makeText(context, "测试", 2000).show();
}

onReceiver中不能进行耗时操作,如果有耗时操作,必须开线程,或者通过intent启动services来完成

 

Android四大组件之BroadcastReceiver

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原文地址:http://www.cnblogs.com/deng-c-q/p/5198704.html

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