Question

我在用户输入表单上有一个EditText行。单击EditText以使用setOnTouchListener启动DatePickerDialog工作正常。我在EditText上设置处理setonFocusChangeListener的{{1}}无效。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OnFocusChange并且DatePickerFragment工作正常......所以问题可能是使用onFocusChange而不是片段？我用DatePickerDialog启动片段的两行是：

onFocusChange()

Activity.java

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

activity.xml

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();
        ...
        });  
    }    
}

在活动文件中编辑1：

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

Answer 1

从此处public class Activity extends AppCompatActivity implements OnFocusChangeListener

删除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();
        ...
        });  
}

Answer 2

这是因为你的onFocusChange事件永远不会被触发，因为当你返回true时你的onTouch事件已经消耗了它。你不能同时拥有这两个事件。如果你只是想在焦点上显示一个对话框，那么我认为只有onFocusChange才能完成这项工作。

编辑：1

我怎么能错过这个？正如@mrinmoy所提到的，你应该从public class Activity extends AppCompatActivity implements OnFocusChangeListener中删除implementsFocusChange。

问题是你正在听两次焦点改变。当您implements OnFocusChangeListener所有与您的活动相关的全局onFocusChange()方法中的所有重点更改都会被覆盖时，您已覆盖。因此，在这种情况下，您在edittext上设置的onFocusChange永远不会被调用。

因此，如果你想为多个edittext处理focusChange，那么实现onFocusChange是好的，否则在单个edittext上设置它会更好。

如果你想在多个editexts上处理onFocusChange，那么这里是样本。

从单个editexts中删除onFocusChange侦听器。

处理您的全局onFocusChange()方法，如下所示。

public class MainActivity extends AppCompatActivity implements View.OnFocusChangeListener{
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        ....
    }

    @Override
    public void onFocusChange(View v, boolean hasFocus) {
        switch (v.getId()) {
            case R.id.editText1:
                // Handle onFocusChange for editText1
                break;
            case R.id.editText2:
                // Handle onFocusChange for editText2
                break;
            case R.id.editText3:
                // Handle onFocusChange for editText3
                break;
            case R.id.editText4:
                // Handle onFocusChange for editText4
                break;
            default:
                // Handle default scenario.
                break;
        }
    }
}

Answer 3

尝试这个，它适合我

 inputDOB.setOnFocusChangeListener(new View.OnFocusChangeListener() {
        @Override
        public void onFocusChange(View view, boolean b) {
            if (b) {
                 datePicker();
            }
        }
    });

和 datePicker 方法是

 public void datePicker() {
    final Calendar c = Calendar.getInstance();
    mYear = c.get(Calendar.YEAR);
    mMonth = c.get(Calendar.MONTH);
    mDay = c.get(Calendar.DAY_OF_MONTH);
        datePickerDialog = new DatePickerDialog(this,
            new DatePickerDialog.OnDateSetListener() {
                @Override
                public void onDateSet(DatePicker view, int year,
                                      int monthOfYear, int dayOfMonth) {
                    inputDOB.setText(formatDate(year,monthOfYear+1,dayOfMonth));
                     datePickerDialog.dismiss();
                    hideSoftKeyboard(SignUpActivity.this);
                }
            }, mYear, mMonth, mDay);
    datePickerDialog.getDatePicker().setMaxDate(System.currentTimeMillis());
    datePickerDialog.show();
}

Android：如何使用onFocusChangeListener启动DatePickerDialog？

3 个答案: