利用半透明对话框实现新浪微博android客户端首次运行时的提示界面

转自： http://blog.csdn.net/sunmanzth/article/details/6902458

首先，设置要覆盖在最上方的dialog的view

[html] view
plaincopy

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout android:background="@drawable/navigater_bg" android:padding="0.0dip" android:layout_width="fill_parent" android:layout_height="fill_parent"
xmlns:android="http://schemas.android.com/apk/res/android&quot;&gt;
<ImageView android:id="@id/ivNavigater_top" android:layout_width="wrap_content" android:layout_height="wrap_content" android:src="@drawable/navigater_top" android:layout_alignParentTop="true" android:layout_centerHorizontal="true" />
<ImageView android:id="@id/ivNavigater_center" android:layout_width="wrap_content" android:layout_height="wrap_content" android:src="@drawable/navigater_center" android:layout_centerInParent="true" />
<ImageView android:id="@id/ivNavigater_clickable" android:padding="0.0dip" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_margin="0.0dip" android:src="@drawable/navigater_clickable" android:layout_alignParentRight="true" android:layout_alignParentBottom="true" />
<ImageView android:id="@id/ivNavigater_bottom" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_margin="0.0dip" android:src="@drawable/navigater_bottom" android:adjustViewBounds="true" android:layout_alignParentLeft="true" android:layout_alignParentBottom="true" />
</RelativeLayout>

然后，在values/styles.xml添加style for 半透明：

[html] view
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<style name="Dialog_Fullscreen">
<item name="android:windowBackground">@android:color/transparent</item>
<item name="android:windowNoTitle">true</item>
<item name="android:windowIsTranslucent">true</item>
<item name="android:windowContentOverlay">@null</item>
<item name="android:windowAnimationStyle">@style/Dialog_Anim</item>
<item name="android:colorBackgroundCacheHint">@null</item>
</style>

继续添加style for 淡入淡出效果：

[html] view
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<style name="Dialog_Anim">
<item name="android:windowEnterAnimation">@anim/fading_in</item>
<item name="android:windowExitAnimation">@anim/fading_out</item>
</style>

在anim文件夹下，添加文件fading_in.xml for 淡入

[html] view
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<?xml version="1.0" encoding="utf-8"?>
<set
xmlns:android="http://schemas.android.com/apk/res/android&quot;&gt;
<alpha android:duration="500" android:fromAlpha="0.1" android:toAlpha="1.0" />
</set>

添加文件fading_out.xml for 淡出

[html] view
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<?xml version="1.0" encoding="utf-8"?>
<set
xmlns:android="http://schemas.android.com/apk/res/android&quot;&gt;
<alpha android:duration="500" android:fromAlpha="0.1" android:toAlpha="1.0" />
</set>

最后，在要弹出对话框的地方添加如下代码：

[java] view
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  Dialog dialog = new Dialog(this, R.style.Dialog_Fullscreen);          
  dialog.setContentView(R.layout.sina);  
  ImageView iv = (ImageView)dialog.findViewById(R.id.ivNavigater_clickable);  
  iv.setOnClickListener(new OnClickListener() {  

@Override  
public void onClick(View v) {  
    dialog.dismiss();  
}  

});
dialog.show();

最终效果如图：