Android如何使用樣式創建半透明窗體

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);

    }

}

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