Implementation of translucent effect in Android application development

Here is an example of a custom activity translucent effect:
Res/values/styles.xml
<resources>
<stylename= "Transparent" >
<itemname= "Android:windowbackground" > @color/transparent_background</item>
<itemname= "Android:windownotitle" >true</item>
<itemname= "Android:windowistranslucent" >true</item>
<itemname= "Android:windowanimationstyle" >@+android:style/Animation.Translucent</item>
</style>
</resources>

Res/values/color.xml
<?xmlversion= "1.0" encoding= "Utf-8"?>
<resources>
<colorname= "Transparent_background" > #50000000 </color>
</resources>
Note: The #5000000 top two bits of the color.xml are transparent to the effect parameters from 00 to FF (transparent-not transparent), and the last 6 bits are the setting of the color manifest.xml
<activityandroid:name= ". Transparentactivity "
Android:theme= "@style/transparent"/>
Java code
Publicvoid onCreate (Bundle savedinstancestate) {
Super.oncreate (savedinstancestate);
SetTheme (r.style.transparent);
Setcontentview (r.layout.transparent);
}

Here is an example of the effect of using a system theme to achieve translucent activity:
Android provides a built-in theme for transparent effects: Theme (android:style/theme.translucent), if you want to achieve transparency, just set the Theme for your activity. If you want to achieve a translucent effect, you only need to inherit android:style/theme.translucent and rewrite it. Inherit android:style/theme.translucent and rewrite:
<?xmlversion= "1.0″encoding=" utf-8″?>
<resources>
<stylename= "Theme.translucent" parent= "Android:style/theme.translucent" >
<itemname= "Android:windowbackground" > @color/translucent_background</item>
<itemname= "Android:colorforeground" > #fff </item>
</style>
</resources>
Use this topic in Androidmainfest.xml:
<activityandroid:name= ". Translucent "android:label=" @string/app_name "
Android:theme= "@style/theme.translucent" >
<intent-filter>
<actionandroid:name= "Android.intent.action.MAIN"/>
<categoryandroid:name= "Android.intent.category.LAUNCHER"/>
</intent-filter>
</activity>

Here is an example of the effect of implementing view translucency:
button or ImageButton background is set to transparent or translucent
Translucent: <button android:background= "#e0000000" .../>
Transparent: <button android:background= "#00000000" .../>
The color and opacity (alpha) values are represented by hexadecimal notation. The range of values for any one color is 0 to 255 (00 to FF)
。 For alpha,00, full transparency is expressed, and FF is completely opaque. The expression order is "Aabbggrr", where "Aa=alpha"
(00 to FF), "Bb=blue" (00 to FF), "Gg=green" (00 to FF), "rr=red" (00 to FF). For example
, you should specify the following values if you want to apply an opacity of 50% to a layer of overlay blue: 7fff0000
Set background picture transparency (super simple)
Java code
View v = Findviewbyid (r.id.content);//Find the ID of the layout you want to set the transparent background
V.getbackground (). Setalpha (100);//0~255 Transparency Value