Question

我在片段中工作，我希望用户输入答案，然后单击按钮时，textview应显示正确。这是我的代码

public class FragmentOne extends Fragment {

    private EditText userAnswer;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        View v = inflater.inflate(R.layout.fragment_fragment_one, null);
        userAnswer = (EditText)v.findViewById(R.id.editText);
        final String theAnswer = (userAnswer.getText().toString());
        Button submit = (Button)v.findViewById(R.id.submitBtn1);
        submit.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                if (theAnswer.equalsIgnoreCase("Germany")) {
                    TextView tv = (TextView)v.findViewById(R.id.showCorrect);
                    tv.setText("Correct!");
                }
            }
        });
        return v;


    }
}

然而，当输入德国时，textView仍然只显示＆＃39; x＆＃39; （我把它设置为最初显示）

相关的XML

<Button
    android:text="Submit"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginTop="30dp"
    android:id="@+id/submitBtn1"
    android:layout_below="@+id/editText"
    android:layout_centerHorizontal="true" />

<EditText
    android:layout_width="220dp"
    android:layout_height="70dp"
    android:inputType="textPersonName"
    android:hint="Write answer and press enter"
    android:ems="10"
    android:id="@+id/editText"
    android:textSize="16sp"
    android:layout_below="@+id/imageView"
    android:layout_centerHorizontal="true" />

<TextView
    android:text="x"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:id="@+id/showCorrect"
    android:layout_below="@+id/skipBtn"
    android:layout_centerHorizontal="true"
    android:layout_marginTop="44dp" />

出了什么问题？

Answer 1

您必须更改此行：

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    // Inflate the layout for this fragment
    View v = inflater.inflate(R.layout.fragment_fragment_one, null);
    userAnswer = (EditText)v.findViewById(R.id.editText);
    TextView tv = (TextView)v.findViewById(R.id.showCorrect);
    Button submit = (Button)v.findViewById(R.id.submitBtn1);
    submit.setOnClickListener(new View.OnClickListener() {
        public void onClick(View v) {
            String theAnswer = (userAnswer.getText().toString());
            if (theAnswer.equalsIgnoreCase("Germany")) {
                tv.setText("Correct!");
            }
        }
    });
    return v;


}

即：在您的代码中，userAnswer值始终相同（未在按钮单击时选中）

Answer 2

代码需要更改为：

public class FragmentOne extends Fragment {

    private EditText userAnswer;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        View v = inflater.inflate(R.layout.fragment_fragment_one, null);
        userAnswer = (EditText)v.findViewById(R.id.editText);
        final TextView tv = (TextView)v.findViewById(R.id.showCorrect); //changed
        Button submit = (Button)v.findViewById(R.id.submitBtn1);
        submit.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                String theAnswer = (userAnswer.getText().toString());
                if (theAnswer.equalsIgnoreCase("Germany")) {
                    //TextView tv = (TextView)v.findViewById(R.id.showCorrect);
                    tv.setText("Correct!");
                }

                // updateScore();
            }
        });
        return v;
    }

Android studio EditText不会加载TextView

2 个答案: