Question

这是我的第一篇stackoverflow帖子我正在尝试构建一个应用程序，使用LocalBroadcastManager检索传感器数据，然后在容器内的已连接片段中更新TextView。我试图从MainActivity调用方法homeFragment.passData（）但没有成功我的猜测是因为片段已经膨胀所以无法通过调用该方法进行更新。

这是MainActivity代码，我调用方法来更新textview

@Override
    public void onReceive(Context context, Intent intent) {
        String azimuthValue = intent.getStringExtra("azimuth");
        String pitchValue = intent.getStringExtra("pitch");
        String rollValue = intent.getStringExtra("roll");


        homeFragment.passData(azimuthValue, pitchValue, rollValue);
    }

这是HomeFragment的代码

public class HomeFragment extends Fragment {

private static final String TAG = "HomeFragment";

private Context mContext;

private TextView xValueTextView;
private TextView yValueTextView;
private TextView zValueTextView;

private OnFragmentInteractionListener mListener;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    View rootView = inflater.inflate(R.layout.fragment_home, container, false);

    xValueTextView = (TextView) rootView.findViewById(R.id.xValueTextView);
    yValueTextView = (TextView) rootView.findViewById(R.id.yValueTextView);
    zValueTextView = (TextView) rootView.findViewById(R.id.zValueTextView);

    Log.d(TAG, "onCreateView: layout inflated");

    return rootView;
}

@Override
public void onAttach(Context context) {
    super.onAttach(context);
    mContext = context;
}

@Override
public void onDetach() {
    super.onDetach();
    mListener = null;
}

public interface OnFragmentInteractionListener {}

public void passData(String x, String y, String z) {
    xValueTextView.setText(x);
    yValueTextView.setText(y);
    zValueTextView.setText(z);

    Log.i(TAG, "updateTextView: TextView value: " + xValueTextView.getText().toString() + "||" + yValueTextView.getText().toString() + "||" + zValueTextView.getText().toString() );
}

}

虽然logcat textview.getText（）。toString显示更新的值，但实际视图尚未更新

10-21 14:03:56.240 19338-19338/pro.adhi.willyam.orientation I/HomeFragment: updateTextView: TextView value: 45||-34||4

这是我手机的截图：https://i.stack.imgur.com/ZDsad.png

那么如何正确更新片段内的textview，就像我想要实现的那样？
我希望我的问题是可以理解的。三江源

Answer 1

您需要在片段中设置setter / getter方法。

public class HomeFragment extends Fragment {

TextView tv;

    public void setTextView(String text)
    {
         TextView tv = (TextView) findViewById( *your id here* );
         tv.setText(text);
    }
}

在MainActivity中，您只需使用此调用：

    public class MainActivity extends AppCompatActivity {

    ...

    HomeFragment.setTextView("Hello World!");

    ...

}

从MainActivity更新片段内的textview

1 个答案: