我正在编写一个非常简单的应用程序来打开我的自定义共享对话框。 XML布局只包含1个按钮：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="@color/white"
android:gravity="center_horizontal">
<Button android:layout_width="fill_parent" android:layout_height="wrap_content"
android:layout_margin="20dip"
android:text="Click here to open Share Dialog"
android:onClick="onBtnShareClick"/>
</LinearLayout>
在Activity上，我创建了一个自定义共享对话框
public class CustomDialog extends Activity {
private static final int SHOW_DIALOG_SHARE = 1;
private ArrayAdapter<ShareItem> mShareAdapter;
@Override
protected void onCreate(Bundle savedState) {
super.onCreate(savedState);
setContentView(R.layout.custom_dialog);
final ShareItem[] items = {
//new Item("Menu item", R.drawable.icon_assistance),
new ShareItem("Banbe", R.drawable.ic_banbe),
new ShareItem("Facebook", R.drawable.ic_facebook),
new ShareItem("Twitter", R.drawable.ic_twitter),
new ShareItem("Gmail", R.drawable.ic_gmail),
new ShareItem("Other sharing options...", 0)
};
mShareAdapter = new ArrayAdapter<ShareItem>(
this,
android.R.layout.select_dialog_item,
android.R.id.text1,
items){
public View getView(int position, View convertView, ViewGroup parent) {
//User super class to create the View
View v = super.getView(position, convertView, parent);
TextView tv = (TextView)v.findViewById(android.R.id.text1);
//Put the image on the TextView
tv.setCompoundDrawablesWithIntrinsicBounds(items[position].icon, 0, 0, 0);
//Add margin between image and text (support various screen densities)
int dp5 = (int) (5 * getResources().getDisplayMetrics().density + 0.5f);
tv.setCompoundDrawablePadding(dp5);
return v;
}
};
}
@Override
protected Dialog onCreateDialog(int id) {
switch (id) {
case SHOW_DIALOG_SHARE:
return new AlertDialog.Builder(this)
.setIcon(R.drawable.icon)
.setTitle(R.string.app_name)
.setAdapter(mShareAdapter, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int item) {
Toast.makeText(CustomDialog.this, "Click on item " + item, Toast.LENGTH_SHORT).show();
}
})
.show();
}
return null;
}
@Override
protected void onSaveInstanceState(Bundle outState) {
// TODO Auto-generated method stub
super.onSaveInstanceState(outState);
}
@Override
protected void onRestoreInstanceState(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onRestoreInstanceState(savedInstanceState);
}
public void onBtnShareClick(View v) {
showDialog(SHOW_DIALOG_SHARE);
}
protected class ShareItem {
public final String text;
public final int icon;
public ShareItem(String text, Integer icon) {
this.text = text;
this.icon = icon;
}
@Override
public String toString() {
return text;
}
}
}
单击该按钮时，将打开我的共享对话框。一切都好。
现在，我将设备旋转到纵向模式，单击按钮打开对话框。之后，按返回以关闭“共享”对话框。 将设备旋转为横向模式。突然分享对话框重新打开，虽然我没有点击按钮。
当我尝试使用本机共享对话框时，我没有看到此错误。也许自定义共享对话框是原因？
谁能告诉我这里有什么问题？
答案 0 :(得分：4)
您好您必须在应用程序清单文件中添加屏幕方向支持。
<activity android:name=".TestApp"
android:label="@string/app_name" android:configChanges="orientation">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
并覆盖以下方法，
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
}
答案 1 :(得分：0)
使用create（）方法代替show（）方法
new AlertDialog.Builder（this）.create（）
答案 2 :(得分：0)
使用Dialog或AlertDialog无关紧要。为了避免在旋转屏幕时关闭对话框，请使用以下代码：
dialog.getWindow().addFlags(WindowManager.LayoutParams.FLAG_DIM_BEHIND);
答案 3 :(得分：0)
尝试使用将从DialogFragment
扩展的自己的类例如：
public class QuestionDialogFragment extends DialogFragment
{
public final static String BF_TITLE = "QuestionDialogFragment.BF_TITLE";
public final static String BF_QUESTION = "QuestionDialogFragment.BF_QUESTION";
private Callback mCallback;
public static void init(FragmentManager fragmentManager, String title, String question, Callback callback)
{
Bundle bundle = new Bundle();
bundle.putString(BF_TITLE, title);
bundle.putString(BF_QUESTION, question);
QuestionDialogFragment dialog = new QuestionDialogFragment();
dialog.setCallbackListener(callback);
dialog.setArguments(bundle);
dialog.show(fragmentManager, null);
}
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setCancelable(false);
}
@Override
public Dialog onCreateDialog(Bundle savedInstanceState)
{
Bundle bundle = getArguments();
String title = null;
String question = null;
if (bundle != null)
{
if (bundle.containsKey(BF_TITLE))
{
title = bundle.getString(BF_TITLE);
}
if (bundle.containsKey(BF_QUESTION))
{
question = bundle.getString(BF_QUESTION);
}
}
AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(getActivity());
alertDialogBuilder.setTitle(title);
alertDialogBuilder.setMessage(question);
//null should be your on click listener
alertDialogBuilder.setPositiveButton("OK", new DialogInterface.OnClickListener()
{
@Override
public void onClick(DialogInterface dialog, int which)
{
mCallback.success();
dialog.dismiss();
}
});
alertDialogBuilder.setNegativeButton("Cancel", new DialogInterface.OnClickListener()
{
@Override
public void onClick(DialogInterface dialog, int which)
{
mCallback.cancel();
dialog.cancel();
}
});
return alertDialogBuilder.create();
}
public void setCallbackListener(Callback callback)
{
this.mCallback = callback;
}
public static interface Callback
{
void success();
void cancel();
}
}
并在代码中的任何位置使用它：
QuestionDialogFragment.init(
getFragmentManager(),
"Some title",
"Some question?",
new QuestionDialogFragment.Callback()
{
@Override
public void success()
{
// @TODO if user choice YES;
}
@Override
public void cancel()
{
// @TODO if user choice CANCEL;
}
});
如果您想要创建自己的视图而不是标准对话框窗口：
Dialog onCreateDialog(Bundle savedInstanceState)
使用
View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
例如：
需要创建值/ layout / your_fragment_layout.xml
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/kom_purchase_dialog_root_view">
<TextView
android:id="@+id/kom_purchase_dialog_message_text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:text="some text"/>
<LinearLayout
android:layout_gravity="bottom"
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<Button
android:id="@+id/kom_purchase_dialog_negative_button"
android:layout_alignParentBottom="true"
android:layout_width="0dp"
android:layout_weight="1"
android:layout_height="wrap_content"
android:text="Cancel"/>
<Button
android:id="@+id/kom_purchase_dialog_positive_button"
android:layout_toRightOf="@+id/kom_purchase_dialog_negative_button"
android:layout_alignParentBottom="true"
android:layout_width="0dp"
android:layout_weight="1"
android:layout_height="wrap_content"
android:text="Ok"/>
</LinearLayout>
</FrameLayout>
并为此布局将自己的类更改为：
public class QuestionDialogFragment2 extends DialogFragment
{
public final static String BF_TITLE = "QuestionDialogFragment.BF_TITLE";
public final static String BF_QUESTION = "QuestionDialogFragment.BF_QUESTION";
private Callback mCallback;
public static void init(FragmentManager fragmentManager, String title, String question, Callback callback)
{
Bundle bundle = new Bundle();
bundle.putString(BF_TITLE, title);
bundle.putString(BF_QUESTION, question);
QuestionDialogFragment2 dialog = new QuestionDialogFragment2();
dialog.setCallbackListener(callback);
dialog.setArguments(bundle);
dialog.show(fragmentManager, null);
}
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setCancelable(false);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
{
Bundle bundle = getArguments();
String title = null;
String question = null;
if (bundle != null)
{
if (bundle.containsKey(BF_TITLE))
{
title = bundle.getString(BF_TITLE);
}
if (bundle.containsKey(BF_QUESTION))
{
question = bundle.getString(BF_QUESTION);
}
}
View view = super.onCreateView(inflater, container, savedInstanceState);
if (view == null)
{
view = inflater.inflate(R.layout.your_fragment_layout, null, false);
view.setTag(new Holder(view));
}
Holder holder = (Holder) view.getTag();
holder.messageTextView.setText(question);
holder.positiveButton.setOnClickListener(new View.OnClickListener()
{
@Override
public void onClick(View v)
{
mCallback.success();
}
});
holder.negativeButton.setOnClickListener(new View.OnClickListener()
{
@Override
public void onClick(View v)
{
mCallback.cancel();
}
});
return view;
}
public void setCallbackListener(Callback callback)
{
this.mCallback = callback;
}
public static interface Callback
{
void success();
void cancel();
}
private final class Holder
{
public TextView messageTextView;
public Button positiveButton;
public Button negativeButton;
private Holder(View view)
{
messageTextView = (TextView) view.findViewById(R.id.question_dialogfragment_message_textview);
positiveButton = (Button) view.findViewById(R.id.question_dialogfragment_positive_button);
negativeButton = (Button) view.findViewById(R.id.question_dialogfragment_negative_button);
}
}
}
和相同的用法：
QuestionDialogFragment2.init(
getFragmentManager(),
"Some title",
"Some question?",
new QuestionDialogFragment2.Callback()
{
@Override
public void success()
{
// @TODO if user choice YES;
}
@Override
public void cancel()
{
// @TODO if user choice CANCEL;
}
});
对于这两种方法，无效onSaveInstanceState（Bundle outState）并在旋转后保存状态。我认为这是更好的通用方法，然后使用简单的对话框。