Android 广播

2024年3月8日 189次阅读

//静态注册：程序没运行也能接收到广播
//动态注册:程序只有运行才能接收到广播

广播动态注册实例:

public class MainActivity extends Activity {

    Button speaker;
    LocalBroadcastManager localer;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        speaker = (Button) findViewById(R.id.speaker);
        localer = LocalBroadcastManager.getInstance(this); //广播管理器对象
        speaker.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent i = new Intent("www.baidu.com!");
                localer.sendBroadcast(i);//发送一个本地广播,本地广播只能动态注册
            }
        });

        IntentFilter filter = new IntentFilter();
        filter.addAction("www.baidu.com!");

        myLocalReceiver mylrec=new myLocalReceiver();//广播接收对象
        localer.registerReceiver(mylrec,filter);//动态注册
    }
}

class myLocalReceiver extends BroadcastReceiver{

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

广播静态注册实例:

在这里插入代码片AndroidManifest.xml：(静态注册)
<application
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:supportsRtl="true"
    android:theme="@style/AppTheme">
    <receiver
        android:name=".myReceiver">
        <intent-filter>
            <action android:name="abc" />
        </intent-filter>
    </receiver>
</application>

myReceiver：广播接收类
public class myReceiver extends BroadcastReceiver {
    @Override
    public void onReceive(Context arg0, Intent arg1) {
        // TODO Auto-generated method stub
        Toast.makeText(arg0, "ihielsali===！！！", Toast.LENGTH_SHORT).show();
    }
}


MainActiviy.java:
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        sendGB=(Button) findViewById(R.id.sendGB);
        sendGB.setOnClickListener(new View.OnClickListener(){

            @Override
            public void onClick(View arg0) {
                // TODO Auto-generated method stub

                Intent intent=new Intent("abc");
                sendBroadcast(intent);
            }
        });
    }
}
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