旋转设备后重新打开Android对话框

问题描述

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：

I'm writing a very simple application to open my custom share dialog.XML layout contains only 1 button:

<?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>

在活动中，我创建一个自定义共享对话框

And on Activity, I create a custom sharing Dialog

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;
        }
    }

}

点击该按钮，我的共享对话框将被打开。所有的好。

When click the button, my Sharing Dialog will be opened. All good.

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。 将设备旋转到横向模式。突然共享对话框重新打开，虽然我没有点击按钮。

Now, I rotate the device to portrait mode, click the button to open the Dialog. After that, press back to close Sharing Dialog. Rotate device to landscape mode. Suddenly Sharing Dialog is re-opened although I didn't click on the button.

当我尝试使用本机共享对话框，我没有看到这个错误。可能是一个自定义共享对话框的原因？

When I try using the native Sharing Dialog I don't see this bug. Maybe a custom Sharing Dialog is the cause?

任何人都可以告诉我这里有什么问题？

Can anyone tell me what's wrong here?

推荐答案

嗨您必须在应用程序清单文件中添加屏幕方向支持。

Hi You have to add screen orientation support in your application manifest file.

 <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>

还可以覆盖以下方法，

  public void onConfigurationChanged(Configuration newConfig) {
    super.onConfigurationChanged(newConfig);
  }

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