Android中如何将BroadcastReceiver中的数据传递给activity

最新推荐文章于 2021-05-28 07:40:54 发布

Quejamais

最新推荐文章于 2021-05-28 07:40:54 发布

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分类专栏： Wifi 文章标签： broadcastreceiver wi-fi 数据传输回调

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本文介绍了在Android中如何通过接口回调的方式，从BroadcastReceiver将接收到的数据传递给Activity。详细讲解了广播接收者的创建以及在Activity中如何接收并处理这些数据。

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原理：用接口回调。定义一个接口让 Activity实现这个接口，然后广播接受者调用接口里面的方法把要传递的参数传进去。

1、广播接收者

public class WifiInfoReceiver extends BroadcastReceiver{
    private ScanEnd scanEnd;

    public static final int SCAN_END_TAG=0;
    public static final int SCAN_FAIL_TAG=-1;
    @Override
    public void onReceive(Context context, Intent intent) {
        if(intent.getAction().equals(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION)){
            //  WIFI扫描结束
            scanEnd.scanEnd(SCAN_END_TAG);
        }else {
            scanEnd.scanEnd(SCAN_FAIL_TAG);
        }
    }

    public interface ScanEnd {
        public void scanEnd(int tag);
    }

    public void scanEndListen(ScanEnd scanEnd) {
        this.scanEnd = scanEnd;
    }
}

2、Activity中接收数据

public class LineActivity extends BaseActivity implements WifiInfoReceiver.ScanEnd{
    private static final String TAG = "LineActivity";
    
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_line);
        initView();

    }

    private void initView() {

        IntentFilter intentFilter = new IntentFilter();
        intentFilter.addAction(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION);
        WifiInfoReceiver receiver = new WifiInfoReceiver();
        registerReceiver(receiver, intentFilter);
        receiver.scanEndListen(this);
       
        WifiManage.getIntance(this).startScan();
    }

    @Override
    public void scanEnd(int tag) {
        if (tag==WifiInfoReceiver.SCAN_END_TAG){
            Log.i(TAG, "scanEnd: success");//扫描完成
        }else {
            Log.i(TAG, "scanEnd: fail");//	扫描失败
        }
    }
}