本例介绍使用透明背景绘制OpenGL 图形。步骤如下:
1. 对于Activity使用透明主题
<activity android:name=”.graphics.TranslucentGLSurfaceViewActivity”
android:label=”Graphics/OpenGL ES/Translucent GLSurfaceView”
android:theme=”@style/Theme.Translucent”
android:configChanges=”keyboardHidden|orientation|screenLayout|screenSize|smallestScreenSize”>
<intent-filter>
< action android:name=”android.intent.action.MAIN” />
<category android:name=”android.intent.category.SAMPLE_CODE” />
< /intent-filter>
< /activity>
2. 使用8888 (RGBA) 格式,Alpha通道是显示透明图形必需的。
[java]
1. // We want an 8888 pixel format because that's required for
2. // a translucent window.
3. // And we want a depth buffer.
4. mGLSurfaceView.setEGLConfigChooser(8, 8, 8, 8, 16, 0);
3. 为GLSurfaceView指定Alpha通道
[java]
1. mGLSurfaceView.getHolder().setFormat(PixelFormat.TRANSLUCENT);
4. 为绘制的图行背景为颜色(0,0,0,0)
[java]
1. gl.glClearColor(0,0,0,0);
作者:mapdigit