Android:如何使用 onFocusChangeListener 启动 DatePickerDialog？

Question

我在用户输入表单上有一个 EditText 行。单击 EditText 以启动 DatePickerDialog 使用 setOnTouchListener 效果很好。我设置的用于处理 EditText 上的 OnFocusChange 的 setonFocusChangeListener 不起作用。我在这里缺少什么？

(不确定这是否有帮助，但在早期版本中我使用了 DatePickerFragment 并且 onFocusChange 工作正常......所以问题可能在于使用 DatePickerDialog 而不是 Fragment？我用 onFocusChange() 启动 Fragment 的两行代码是:

DatePickerFragment newFragment = new DatePickerFragment(); // and
newFragment.show(getSupportFragmentManager(), "datePicker");)

Activity .java

public class Activity extends AppCompatActivity implements OnFocusChangeListener {
    ...
    private DatePickerDialog zDatePickerDialog
    private int mYear;
    private int mMonth;
    private int mDay;

    Override
    protected void onCreate(final Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        zListenerEditText = (ListenerEditText) findViewById(id.ZEditText);

        Calendar calendar = Calendar.getInstance();
        mYear = calendar.get(Calendar.YEAR);
        mMonth = calendar.get(Calendar.MONTH);
        mDay = calendar.get(Calendar.DAY_OF_MONTH);
        mDatePickerDialog = new DatePickerDialog(this,this,mYear,mMonth,mDay);

        // This is working fine to handle the a click to launch the DatePickerDialog
        zListenerEditText.setOnTouchListener(new View.OnTouchListener() {
            @Override
            public boolean onTouch(View v, MotionEvent event) {
                // launch the DatePickerDialog.
                mDatePickerDialog.show();        
                return true;
            }
        }); 

        // This does not work to launch the DatePickerDialog
        zListenerEditText.setOnFocusChangeListener(new View.OnFocusChangeListener() {
        @Override
        public void onFocusChange(View v, boolean hasFocus) {    
            if (hasFocus ) {
                // launch the DatePickerDialog.
                mDatePickerDialog.show();
        ...
        });  
    }    
}

Activity .xml

    ...
    <com.widget.ListenerEditText
        android:id="@+id/ZEditText"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"        
        android:inputType="none"
        android:textColor="#FFFFFF"  />

在Activity文件中编辑1:

...
@Override
public void onFocusChange(View v, boolean hasFocus) {
    switch (v.getId()) {
        case id.CEditText:
            Toast.makeText(this,"C",Toast.LENGTH_LONG).show();
            // Handle onFocusChange for editText1
            break;
        case id.DEditText:
            Toast.makeText(this,"D",Toast.LENGTH_LONG).show();
            // Handle onFocusChange for editText2
            break;
        case id.EEditText:
            Toast.makeText(this,"E",Toast.LENGTH_LONG).show();
            // Handle onFocusChange for editText3
            break;
        case id.FEditText:
            Toast.makeText(this,"F",Toast.LENGTH_LONG).show();
            // Handle onFocusChange for editText4
            break;
        case id.GEditText:
            Toast.makeText(this,"G",Toast.LENGTH_LONG).show();
            // Handle default scenario.
            break;
    }
}

Answer 1

从这里删除 OnFocusChangeListener public class Activity extends AppCompatActivity implements OnFocusChangeListener

保持这样

public class Activity extends AppCompatActivity {
zListenerEditText = (ListenerEditText) findViewById(id.ZEditText);

        Calendar calendar = Calendar.getInstance();
        mYear = calendar.get(Calendar.YEAR);
        mMonth = calendar.get(Calendar.MONTH);
        mDay = calendar.get(Calendar.DAY_OF_MONTH);
        mDatePickerDialog = new DatePickerDialog(this,this,mYear,mMonth,mDay);

        // This is working fine to handle the a click to launch the DatePickerDialog

        // This does not work to launch the DatePickerDialog
        zListenerEditText.setOnFocusChangeListener(new View.OnFocusChangeListener() {
        @Override
        public void onFocusChange(View v, boolean hasFocus) {    
            if (hasFocus ) {
                // launch the DatePickerDialog.
                mDatePickerDialog.show();
        ...
        });  
}