本示例介紹如何使用Android系統樣式和自定義樣式創建半透明界面。
1. 定義清單文件(AndroidManifest.xml)
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="my.andriod.test"
android:versionCode="1"
android:versionName="1.0">
<application android:icon="@drawable/icon" android:label="@string/app_name">
<!– 使用自定義半透明主題樣式 android:theme="@style/Theme.Translucent" –>
<activity android:name=".TranslucentActivity"
android:label="@string/app_name"
android:theme="@style/Theme.Translucent">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<!– 使用Android系統半透明主題樣式
<activity android:name=".TranslucentActivity"
android:label="@string/app_name"
android:theme="@android:style/Theme.Translucent">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
–>
</application>
<uses-sdk android:minSdkVersion="9" />
</manifest>
2. 定義字符串資源(strings.xml)
<?xml version="1.0" encoding="utf-8"?>
<resources>
<string name="hello">Hello World, TranslucentActivity!</string>
<string name="app_name">TranslucentActivity</string>
<string name="activity_translucent">App/Activity/Translucent</string>
<string name="translucent_background">Example of how you can make an
activity have a translucent background, compositing over
whatever is behind it.</string>
</resources>
3. 定義自定義樣式(values/styles.xml)
<?xml version="1.0" encoding="utf-8"?>
<resources>
<!– 繼承Android系統的半透明主題樣式,並指定半透明背景的顏色、隱藏窗口標題和前景色 –>
<style name="Theme.Translucent" parent="android:style/Theme.Translucent">
<item name="android:windowBackground">@drawable/translucent_background</item>
<item name="android:windowNoTitle">true</item>
<item name="android:colorForeground">#fff</item>
</style>
</resources>
4. 定義半透明顏色(colors.xml)
<?xml version="1.0" encoding="utf-8"?>
<resources>
<drawable name="translucent_background">#e0000000</drawable>
</resources>
5. 定義佈局文件(translucent_background.xml)
<?xml version="1.0" encoding="utf-8"?>
<!– 在Activity中顯示文本 –>
<TextView xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/text"
android:layout_width="match_parent" android:layout_height="match_parent"
android:gravity="center_vertical|center_horizontal"
android:text="@string/translucent_background"/>
6. 創建Activity(TranslucentActivity.java)
package my.andriod.test;
import android.app.Activity;
import android.os.Bundle;
publicclass TranslucentActivity extends Activity {
/** Activity首次創建時,調用這個方法 */
@Override
publicvoid onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//填充佈局
setContentView(R.layout.translucent_background);
}
}
摘自 FireOfStar的專欄