我正在尝试在Android应用程序中实现DatePicker对话框。但是，不幸的是，对话没有打开。 我的守则如下：
public class HomeActivity extends Activity implements View.OnClickListener {
private EditText medWorkTitle;
private EditText medWorkDescription;
private Button mbtnSetTime;
private Button mbtnSetDate;
private Button mbtnSave;
private TextView mtxtDateTime;
private Calendar mCalendar;
private int mInt_year, mInt_month, mInt_day;
static final int DATE_PICKER_ID = 1111;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_home);
init();
// FOR DATE-PICKER
mInt_year = mCalendar.get(Calendar.YEAR);
mInt_month = mCalendar.get(Calendar.MONTH);
mInt_day = mCalendar.get(Calendar.DAY_OF_MONTH);
showDate(mInt_year, mInt_month + 1, mInt_day);
}
public void init() {
mCalendar = Calendar.getInstance();
medWorkDescription = (EditText) findViewById(R.id.edWorkDescription);
medWorkTitle = (EditText) findViewById(R.id.edWorkTitle);
mtxtDateTime = (TextView) findViewById(R.id.txtDateTime);
mbtnSave = (Button) findViewById(R.id.btnSave);
mbtnSave.setOnClickListener(this);
mbtnSetDate = (Button) findViewById(R.id.btnSetDate);
mbtnSetDate.setOnClickListener(this);
mbtnSetTime = (Button) findViewById(R.id.btnSetTime);
mbtnSetTime.setOnClickListener(this);
}
@Override
public void onClick(View view) {
switch (view.getId()) {
case R.id.btnSetDate:
break;
case R.id.btnSetTime:
break;
case R.id.btnSave:
break;
}
}
// /////FOR DATE-PICKER
public void setDate(View view) {
showDialog(DATE_PICKER_ID);
Toast.makeText(getApplicationContext(), "ca", Toast.LENGTH_SHORT)
.show();
}
@Override
protected Dialog onCreateDialog(int id) {
// TODO Auto-generated method stub
switch (id) {
case DATE_PICKER_ID:
return new DatePickerDialog(this, myDateListener, mInt_year,
mInt_month, mInt_day);
}
return null;
}
private DatePickerDialog.OnDateSetListener myDateListener = new DatePickerDialog.OnDateSetListener() {
@Override
public void onDateSet(DatePicker arg0, int arg1, int arg2, int arg3) {
showDate(arg1, arg2 + 1, arg3);
}
};
private void showDate(int year, int month, int day) {
if (day < 10) {
if (month < 10) {
mtxtDateTime.setText(new StringBuilder().append("0" + day)
.append("/").append("0" + month).append("/")
.append(year));
} else {
mtxtDateTime.setText(new StringBuilder().append("0" + day)
.append("/").append(month).append("/").append(year));
}
} else {
if (month < 10) {
mtxtDateTime.setText(new StringBuilder().append(day)
.append("/").append("0" + month).append("/")
.append(year));
} else {
mtxtDateTime.setText(new StringBuilder().append(day)
.append("/").append(month).append("/").append(year));
}
}
}
}
我的布局文件如下：
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:paddingBottom="@dimen/activity_vertical_margin"
tools:context=".HomeActivity">
<RelativeLayout
android:id="@+id/rel_homeContent"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_centerInParent="true">
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="Work Title"
android:id="@+id/edWorkTitle" />
<EditText
android:id="@+id/edWorkDescription"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@+id/edWorkTitle"
android:hint="Work Description" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/lin_homeDateTime"
android:orientation="horizontal"
android:layout_below="@+id/edWorkDescription">
<Button
android:id="@+id/btnSetDate"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Set Date"
android:onClick="setDate"
android:layout_weight="1" />
<Button
android:layout_weight="1"
android:id="@+id/btnSetTime"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:onClick="setDate"
android:text="Set Time" />
</LinearLayout>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/txtDateTime"
android:layout_below="@+id/lin_homeDateTime"
android:text="Please set date and time of your work" />
<RadioGroup
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@+id/txtDateTime"
android:id="@+id/rgWorkValue"
android:orientation="horizontal">
<RadioButton
android:id="@+id/rdNormal"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Normal"
android:checked="true"
android:layout_weight="1" />
<RadioButton
android:id="@+id/rdImportant"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Important"
android:layout_weight="1" />
<RadioButton
android:id="@+id/rdVeryImportant"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Very Important"
android:layout_weight="1" />
</RadioGroup>
<Button
android:id="@+id/btnSave"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="SAVE"
android:layout_below="@+id/rgWorkValue" />
</RelativeLayout>
拜托，让我知道我的错误。谢谢。