据我所知,没有用于此的 API。所以解决方案是尝试在设备上解码一些 webp 图像并检查它是否返回位图。
这可以像这样实现:
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
public class WebPUtils {
//states
private static final int NOT_INITIALIZED = -1;
private static final int SUPPORTED = 1;
private static final int NOT_SUPPORTED = 0;
//why not boolean? we need more states for result caching
private static int isWebPSupportedCache = NOT_INITIALIZED;
public static boolean isWebPSupported() {
// did we already try to check?
if (isWebPSupportedCache == NOT_INITIALIZED) {
//no - trying to decode
//webp 1x1 transparent pixel with lossless
final byte[] webp1x1 = new byte[]{
0x52, 0x49, 0x46, 0x46, 0x1A, 0x00, 0x00, 0x00,
0x57, 0x45, 0x42, 0x50, 0x56, 0x50, 0x38, 0x4C,
0x0D, 0x00, 0x00, 0x00, 0x2F, 0x00, 0x00, 0x00,
0x10, 0x07, 0x10, 0x11, 0x11, (byte) 0x88, (byte) 0x88, (byte) 0xFE,
0x07, 0x00
};
try {
final Bitmap bitmap = BitmapFactory.decodeByteArray(webp1x1, 0, webp1x1.length);
if (bitmap != null) {
//webp supported
isWebPSupportedCache = SUPPORTED;
//don't forget to recycle!
bitmap.recycle();
} else {
//bitmap is null = not supported
isWebPSupportedCache = NOT_SUPPORTED;
}
} catch (Exception ex) {
//we got some exception = not supported
isWebPSupportedCache = NOT_SUPPORTED;
ex.printStackTrace();
}
}
return isWebPSupportedCache == SUPPORTED;
}
}