Question

我想设计一个扩展Edittext的类，以便

1）拥有名为“realanswer”的新自定义属性，其中包含字符串值

2）在改变焦点后的这个类中，通过该类中的方法自动（在主活动中定义监听器）检测输入值是否等于“realanswer”！如果答案是真的，请将textcolor设为绿色，否则阅读。这是我的新班级：

package com.faridi.myapplication;

import android.content.Context;
import android.content.res.TypedArray;
import android.util.AttributeSet;
import android.widget.EditText;

public class MFEditText extends EditText {
public Context mcontext;
public String realanswer;
public MFEditText(Context context, AttributeSet attrs) {
    super(context, attrs);
    this.mcontext=context;
    TypedArray typedArray = 
     context.obtainStyledAttributes(attrs,R.styleable.answer);
    String attr = 
     typedArray.getString(R.styleable.answer_answerAttribute);
    setCustomAttribute(attr);
    this.realanswer=attr;
    Toast.makeText(MFEditText.this.mcontext,
            attr,Toast.LENGTH_LONG).show();
      typedArray.recycle();
      this.addTextChangedListener(new TextWatcher() {
        @Override
        public void beforeTextChanged(CharSequence s, int start, int 
        count, int after) {

        }

        @Override
        public void onTextChanged(CharSequence s, int start, int before, 
          int count) {        
       if(MFEditText.this.getText().toString().
        equals(MFEditText.this.realanswer)){
                MFEditText.this.setTextColor(Color.GREEN);
            }else {
                MFEditText.this.setTextColor(Color.RED);
            }
            Toast.makeText(MFEditText.this.mcontext,
                    MFEditText.this.realanswer+
       "  "+MFEditText.this.getText(),Toast.LENGTH_LONG).show();
        }

        @Override
        public void afterTextChanged(Editable s) {

        }
    });

}
private void setCustomAttribute(String attr) {

    realanswer=attr;
}
private String getCustomAttribute() {

    return realanswer;
}
}

这是我的attr.xml文件

<?xml version="1.0" encoding="utf-8"?>
<resources>

<declare-styleable name="answer">

    <attr name="answerAttribute" format="string"/>

</declare-styleable>


</resources>

这就是我在mainlayout中使用它的方式

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:custom="http://schemas.android.com/apk/res-auto"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_margin="25dp"
android:layout_height="match_parent">

 <com.faridi.myapplication.MFEditText
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    custom:answerAttribute="33"
    android:id="@+id/mfet"
    />
<EditText
    android:layout_width="wrap_content"
    android:layout_height="wrap_content" />
</LinearLayout>

它现在有效。问题解决了。

Answer 1

您可以TextWatcher EditText使用TextWatcher addremark_text_watcher = new TextWatcher() { @Override public void beforeTextChanged(CharSequence s, int start, int count, int after) { } @Override public void onTextChanged(CharSequence s, int start, int before, int count) { // write your logic here } @Override public void afterTextChanged(Editable s) { } };来检查答案是否重新启用，或者不是这样的

public MyActivity extends AppCompatActivity {

    ...

}

public class FragmentA extends Fragment implements OnClickListener {

    ...

    private SharedViewModel mSharedViewModel;

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

        mSharedViewModel = ViewModelProviders.of(getActivity()).get(SharedViewModel.class);

        mSharedViewModel.getData().observe(this, value -> {
            updateUIValue(value);
        });

    }

    @Override
    public void OnClick(View v) {
        if (v == dialogButton) {
            showDialog();
        }
    }

    @Override
    public void OnClick(View v) {
        if (v == dialogButton) {
            showDialog();
        }
    }

    public void showDialog() {
        String diagName = getResources().getString(R.string.dialog_title);
        MyDialog myDialog = MyDialog.newInstance(getFragmentAValue());
        myDialog.show(getFragmentManager(), diagName);
    }
}

public class MyDialog extends DialogFragment implements OnClickListener {

    ...

    private SharedViewModel mSharedViewModel;

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

        mSharedViewModel = ViewModelProviders.of(getActivity()).get(SharedViewModel.class);

        mSharedViewModel.getData().observe(this, value -> {
            updateUIValue(value);
        });

    }

    @Override
    public void onClick(View view) {
        if (view == acceptButton) {
            ...

            mSharedViewModel.setValue(newValue);
        }
        else if (view == cancelButton) {
            dismiss();
        }
    }
}


public class SharedViewModel extends ViewModel {

    final MutableLiveData<Resource<Value>> data = new MutableLiveData<>();

    public MutableLiveData<Value> getData() {
        return data;
    }

    public void setValue(Value newValue) {
        this.data.setValue(newValue)
    }
}

扩展Edittext类并添加自定义属性以检测正确答案

1 个答案: