Android四大組件之BroadcastReceiver

標籤：

(1)BroadcastReceiver的兩種註冊方式

     當我們建立了一個繼承於BroadcastReceiver的廣播接收者類以後，要在程式中去註冊，註冊的第一種方式是xml方式，在Mainfest註冊檔案中去註冊，註冊的xml代碼如下

<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>

　　然後再程式中發送廣播

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

（2）通過java代碼動態註冊

private Button btnStart;    private Button btnStop;    private BroadcastReceiver receiver;        @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);                //動態方式註冊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) {                //靜態方式                /*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）接收者對象的銷毀  unregisterReciever（receiver）；

（4）在接收者對象中的

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

onReceiver中不能進行耗時操作，如果有耗時操作，必須開線程，或者通過intent啟動services來完成

Android四大組件之BroadcastReceiver