Android - BroadcastReceiver 廣播

Android - 廣播

靜態：

①	編寫主類 sendBroadcast(intent)；
②	編寫接收類繼承 BroadcastReceiver 重寫onReceive方法
③	寫AndroidManifest.xml

主類：

public class MainActivity extends Activity {
	Button button_send;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        button_send = (Button) findViewById(R.id.button_send);
        button_send.setOnClickListener(new OnClickListener() {
			@Override
			public void onClick(View arg0) {
					Intent intent = new Intent();
					intent.setAction("FM895");
					sendBroadcast(intent);
			}
		});
    }
}

接收類

public class MyReceive extends BroadcastReceiver {
	@Override
	public void onReceive(Context arg0, Intent arg1) {
		Log.e("__________","OK");
	}
}

AndroidManifest.xml

<receiver android:name="com.example.venbo.MyReceive">
   <intent-filter>
       <action android:name="FM895">
       </action>
   </intent-filter>
</receiver>

點選按鈕檢視結果：

動態：

①	編寫主類：例項化IntentFilter物件，新增.addAction，註冊廣播接收
②	編寫按鈕點選事件：例項化Intent，設定.setAction，.putExtra放內容，sendBroadcast傳送
③	編寫接收類，觸發Toast提示；

Java主類：

public class MainActivity extends Activity {

	Button button_send;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        		//例項化IntentFilter物件
                 IntentFilter filter = new IntentFilter();
                 filter.addAction("FM895");
                 MyReceive myReceive = new MyReceive();
                 //註冊廣播接收
                registerReceiver(myReceive,filter);
        
        button_send = (Button) findViewById(R.id.button_send);
        button_send.setOnClickListener(new OnClickListener() {
			@Override
			public void onClick(View arg0) {
					Intent intent = new Intent();
					intent.setAction("FM895");
					intent.putExtra("information","雷霆嘎巴！");
					sendBroadcast(intent);
			}
		});
    }
}

接收類：

public class MyReceive extends BroadcastReceiver {
	@Override
	public void onReceive(Context arg0, Intent arg1) {
		Toast t = Toast.makeText(arg0,"動態廣播："+ arg1.getStringExtra("information"), Toast.LENGTH_SHORT);
		t.setGravity(Gravity.TOP,0,0);
		t.show();
	}
}

點選執行 結果：

自己動手試一試，你也可以！