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

首先，设置要覆盖在最上方的dialog的view

[html] view
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<?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">

<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">

<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">

<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();