更新:从 ExoPlayer 1.5.1 开始,此问题已得到修复(请参阅https://github.com/google/ExoPlayer/commit/79055066813123c939c29e5a5e223a5ff043b91e https://github.com/google/ExoPlayer/commit/79055066813123c939c29e5a5e223a5ff043b91e)
我跟踪ExoPlayer的开发人员并找到了答案:
可靠检测 4K 设备的唯一方法是使用Device.Mode
仅适用于 api 级别 23+。请参阅此处的 Android M 注释:
https://developer.android.com/preview/api-overview.html#4K-display https://developer.android.com/preview/api-overview.html#4K-display
该类的文档在这里:
https://developer.android.com/reference/android/view/Display.Mode.html#getPhysicalWidth() https://developer.android.com/reference/android/view/Display.Mode.html#getPhysicalWidth()
As for ExoPlayer
从当前版本(1.4.2)开始,它没有实现此代码,但这可能会改变。看:
https://github.com/google/ExoPlayer/issues/800 https://github.com/google/ExoPlayer/issues/800
最后回答一下这个问题,目前检测 4K 的正确方法是这样的:
/**
* Used to check if the connected device support UHD (3840x2160)
*
* Note that this call will fail to identify UHD devices on api level bellow 23 (M)
*
* @return 1 if device is UHD, 0 otherwise
*/
public int isUHD(){
Display display = getActivity().getWindowManager().getDefaultDisplay();
Point displaySize = getDisplaySize(display);
return (displaySize.x >= 3840 && displaySize.y >= 2160) ? 1 : 0;
}
/**
* Convenience function that forks to the different ways to obatin the Display size across Android versions
*
* @param display Display instance to obtain information from
*
* @return Point a Point describing the Display size
*/
private static Point getDisplaySize(Display display) {
Point displaySize = new Point();
if(Util.SDK_INT >= 23){
getDisplaySizeV23(display, displaySize);
}else if(Util.SDK_INT >= 17) {
getDisplaySizeV17(display, displaySize);
} else if(Util.SDK_INT >= 16) {
getDisplaySizeV16(display, displaySize);
} else {
getDisplaySizeV9(display, displaySize);
}
return displaySize;
}
@TargetApi(23)
private static void getDisplaySizeV23(Display display, Point outSize){
Display.Mode[] modes = display.getSupportedModes();
if(modes.length > 0){
Display.Mode mode = modes[0];
outSize.x = mode.getPhysicalWidth();
outSize.y = mode.getPhysicalHeight();
}
}
@TargetApi(17)
private static void getDisplaySizeV17(Display display, Point outSize) {
display.getRealSize(outSize);
}
@TargetApi(16)
private static void getDisplaySizeV16(Display display, Point outSize) {
display.getSize(outSize);
}
private static void getDisplaySizeV9(Display display, Point outSize) {
outSize.x = display.getWidth();
outSize.y = display.getHeight();
}
这会在 api 小于 23 上给出错误的结果。