我使用自定义ListPreference在用户点击它时显示我的自定义Dialog。它看起来像是：
public class DeadLinePicker extends ListPreference{
static final int DATE_DIALOG_ID = 1;
static final int TIME_DIALOG_ID = 0;
Dialog dialog;
DeadLinePicker instance;
Context context ;
private int mDay;
private int mHour;
private int mMinute;
private int mYear;
private int mMonth;
public DeadLinePicker(Context context) {
super(context);
this.context = context;
}
public DeadLinePicker(Context context, AttributeSet attrs) {
super(context, attrs);
this.context = context;
final Calendar c = Calendar.getInstance();
mYear = c.get(Calendar.YEAR);
mMonth = c.get(Calendar.MONTH);
mDay = c.get(Calendar.DAY_OF_MONTH);
mHour = c.get(Calendar.HOUR);
mMinute = c.get(Calendar.MINUTE);
}
private TimePickerDialog.OnTimeSetListener mTimeSetListener = new TimePickerDialog.OnTimeSetListener() {
public void onTimeSet(TimePicker view, int hourOfDay, int minuteOfHour) {
mHour = hourOfDay;
mMinute = minuteOfHour;
updateDisplay();
}
};
DatePickerDialog.OnDateSetListener mDateSetListener =
new DatePickerDialog.OnDateSetListener() {
public void onDateSet(DatePicker view, int year, int monthOfYear,
int dayOfMonth) {
mYear = year;
mMonth = monthOfYear;
mDay = dayOfMonth;
updateDisplay();
}
};
private CustomListPreferenceAdapter customListPreferenceAdapter;
protected Dialog onCreateDialog(int id) {
switch (id) {
case DATE_DIALOG_ID:
return new DatePickerDialog(context,
mDateSetListener,
mYear, mMonth, mDay);
case TIME_DIALOG_ID:
return new TimePickerDialog(context, mTimeSetListener, mHour, mMinute,
false);
}
return null;
}
protected void onPrepareDialog(int id, Dialog dialog) {
switch (id) {
case DATE_DIALOG_ID:
((DatePickerDialog) dialog).updateDate(mYear, mMonth, mDay);
break;}
}
public void updateDisplay() {
Activity activity = (Activity)context;
instance = new DeadLinePicker(context);
String minutes = null;
if (mMinute>9)
minutes = Integer.toString(mMinute);
else
minutes = "0"+Integer.toString(mMinute);
instance.setSummary(
new StringBuilder()
// Month is 0 based so add 1
.append(mYear).append("-")
.append(mMonth + 1).append("-")
.append(mDay)
.append(" ").append(mHour).append(":").append(minutes)
);
activity.showDialog(DATE_DIALOG_ID);
}
@Override
protected void onPrepareDialogBuilder(Builder builder) {
super.onPrepareDialogBuilder(builder);
builder.setNegativeButton(null, null);
builder.setTitle(null);
builder.setView(null);
builder.setAdapter(null, null);
Dialog alert = builder.create();
alert.dismiss();
}
}
updateDisplay()上致电onPreferenceClick时，我的自定义对话框已成功显示。但在此之后还会展示标准对话框。我想让它不显示。我在onPrepareDialogBuilder中设置了空值，但它仍然显示。我怎么能不显示？
答案 0 :(得分：1)
我这样解决了：添加了自定义布局的footerView，看起来像ListPreference：
public class CustomEditPreference extends RelativeLayout{
private CustomTextView title;
private CustomTextView summary;
Context ctx;
private ImageView icon;
private int alpha = 255;
public CustomEditPreference(Context context) {
super(context);
init(context, null);
setWillNotDraw(false);
}
public CustomEditPreference(Context context, AttributeSet attrs) {
super(context, attrs);
init(context, attrs);
setWillNotDraw(false);
}
private void init(Context context, AttributeSet attrs)
{
LayoutInflater inflater = (LayoutInflater)getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
inflater.inflate(R.layout.icon_pref, this);
title = (CustomTextView) this.findViewById(android.R.id.title);
summary = (CustomTextView) this.findViewById(android.R.id.summary);
icon = (ImageView) this.findViewById(R.id.icon);
TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.CustomEditPreference);
int i= a.getInt(R.styleable.CustomEditPreference_iconDisable,0);
String v= a.getString(R.styleable.CustomEditPreference_android_title);
int alpha= a.getInt(R.styleable.CustomEditPreference_alpha, 0);
if (i!=0)
{
icon.setVisibility(View.GONE);
}
if (v!=null)
title.setText(v);
if (alpha !=0)
this.setAlpha(alpha);
a.recycle();
}
public void setTitle(String text)
{
title.setText(text);
}
public void setSummary(String text)
{
summary.setText(text);
}
public String getSummary()
{
return this.summary.getText().toString();
}
public void setIcon(int rez)
{
Resources res = getResources();
Drawable icon2 = res.getDrawable(rez);
icon.setImageDrawable(icon2);
}
public void iconDisable()
{
icon.setVisibility(View.GONE);
}
public int getAlpha(){
return alpha;
}
public void setAlpha(int opacity){
if (this.alpha != opacity) {
alpha = opacity;
AlphaAnimation alpha = new AlphaAnimation(0.5F, 0.5F);
alpha.setDuration(0); // Make animation instant
alpha.setFillAfter(true); // Tell it to persist after the animation ends
// And then on your layout
this.startAnimation(alpha);
invalidate();
}
}
}
布局文件：
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:foo="http://schemas.android.com/apk/res/com.assignmentexpert"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:minHeight="?android:attr/listPreferredItemHeight"
android:paddingRight="?android:attr/scrollbarSize">
<RelativeLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="2dip"
android:layout_marginRight="6dip"
android:layout_marginTop="6dip"
android:layout_marginBottom="6dip"
android:layout_weight="1">
<com.customitems.CustomTextView android:id="@+android:id/title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:singleLine="true"
foo:customFont="Roboto-Medium.ttf"
android:layout_marginLeft="25dp"
android:textAppearance="?android:attr/textAppearanceLarge"
android:ellipsize="marquee"
android:fadingEdge="horizontal" />
<com.customitems.CustomTextView
android:id="@+android:id/summary"
foo:customFont="Roboto-Medium.ttf"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="25dp"
android:textColor="#42aeff"
android:layout_below="@android:id/title"
android:textAppearance="?android:attr/textAppearanceSmall"
android:maxLines="2" />
</RelativeLayout>
<ImageView
android:id="@+id/icon"
android:layout_width="wrap_content"
android:src="@drawable/list_pointer"
android:layout_alignParentRight="true"
android:layout_height="wrap_content"
android:layout_marginRight="10dp"
android:layout_centerVertical="true"/>
</RelativeLayout>
和我在上面发布的相同的对话框创建和显示机制。