从服务调用 setResult class

Question

在我的 UiFragment 程序中，我尝试连接我的设备。

public void onActivityResult(int requestCode, int resultCode, Intent data) {
            switch (requestCode) {
                case REQUEST_CONNECT_DEVICE_SECURE:
                    // When DeviceListActivity returns with a device to connect
                    if (resultCode == Activity.RESULT_OK) {
                        connectDevice(data);
                    }
                    break;
            }
    }

我也有 StartScanService class 需要做类似于 setResult 的事情（就像我在 Activity class 中做的那样）

public class StartScanService extends Service {
 ...
 ...
private void connect(String tmp){
        adapter.cancelDiscovery();

        String address = tmp.substring(tmp.length() - 17);

        // Create the result Intent and include the MAC address
        Intent intent = new Intent();
        intent.putExtra(EXTRA_DEVICE_ADDRESS, address);

        // Set result 
        //setResult(Activity.RESULT_OK, intent);

    }

}

所以我需要从服务 class 调用片段 class 方法。可以吗？

Answer 1

我使用界面来做到这一点。首先我创建界面

public interface ServiceCallBack {
    void connectToDevice(Intent intent);
}

在我的服务中 class 我调用接口方法 'connectToDevice'

public class StartScanService extends Service {
...
...
...
private ServiceCallBack serviceCallBack;

private void connect(String tmp){
        adapter.cancelDiscovery();

        String address = tmp.substring(tmp.length() - 17);

        // Create the result Intent and include the MAC address
        Intent intent = new Intent();
        intent.putExtra(EXTRA_DEVICE_ADDRESS, address);

        if (serviceCallBack != null) {
            serviceCallBack.connectToDevice(intent);
        }
    }

}

我的 Fragment class 必须实现 ServiceCallBack 接口

public class UiFragment extends Fragment implements ServiceCallBack{
private ServiceConnection connectionService = new ServiceConnection() {
    @Override
    public void onServiceConnected(ComponentName name, IBinder service) {
        Log.d(TAG + " VEG", "onServiceConnected");
        StartScanService.ScanBinder scan = (StartScanService.ScanBinder) service;
        startScanService = scan.getScanService();
        startScanService.setHandler(handler);
        startScanService.setServiceCallBack(UiFragment.this);
        startScanService.startScan();
        bound = true;
    }

    @Override
    public void onServiceDisconnected(ComponentName name) {
        bound = false;
        Log.d(TAG, "onServiceDisconnected");
    }
};

@Override
public void connectToDevice(Intent intent) {
    connectDevice(intent);
}
}

从服务调用 setResult class

calling setResult from Service class

service

android

fragment

onactivityresult