如何解决如何从鸿蒙系统中的资源设置 PixelMap?
在 Android 中,我们可以使用 BitmapFactory 为资源图像/可绘制对象创建位图:
Bitmap bm = BitmapFactory.decodeResource(getResources(),R.drawable.image);
我们如何在鸿蒙系统中根据资源 id 创建相应的 PixelMap?
解决方法
欢迎加入社区!
我们可以通过以下方法从资源中获取 PixelMap。
import ohos.app.Context;
import ohos.global.resource.NotExistException;
import ohos.global.resource.RawFileEntry;
import ohos.global.resource.Resource;
import ohos.global.resource.ResourceManager;
import ohos.global.resource.WrongTypeException;
import ohos.hiviewdfx.HiLog;
import ohos.hiviewdfx.HiLogLabel;
import ohos.media.image.ImageSource;
import ohos.media.image.PixelMap;
import java.io.IOException;
import java.util.Optional;
/**
* Resources Utility
*/
public class ResUtil {
private static final String LABEL = "ResUtil";
private static final String MESSAGE = "IOException | NotExistException | WrongTypeException";
private static final HiLogLabel LABEL_LOG = new HiLogLabel(3,123401234,"ResUtil");
private ResUtil() {
}
/**
* get the path from id.
*
* @param context the context
* @param id the id
* @return the path from id
*/
public static String getPathById(Context context,int id) {
String path = "";
if (context == null) {
return path;
}
ResourceManager manager = context.getResourceManager();
if (manager == null) {
return path;
}
try {
path = manager.getMediaPath(id);
} catch (IOException | NotExistException | WrongTypeException e) {
HiLog.error(LABEL_LOG,"%{public}s: %{public}s",new Object[]{"getPathById",MESSAGE});
}
return path;
}
/**
* check if the input string is empty.
*
* @param input string
* @return boolean value
*/
public static boolean isEmpty(String input) {
return input == null || input.length() == 0;
}
/**
* get the pixel map.
*
* @param context the context
* @param id resource id
* @return the pixel map
*/
public static Optional<PixelMap> getPixelMap(Context context,int id) {
String path = getPathById(context,id);
if (context == null || isEmpty(path)) {
return Optional.empty();
}
RawFileEntry assetManager = context.getResourceManager().getRawFileEntry(path);
ImageSource.SourceOptions options = new ImageSource.SourceOptions();
options.formatHint = "image/png";
ImageSource.DecodingOptions decodingOptions = new ImageSource.DecodingOptions();
try {
Resource asset = assetManager.openRawFile();
ImageSource source = ImageSource.create(asset,options);
return Optional.ofNullable(source.createPixelmap(decodingOptions));
} catch (IOException e) {
HiLog.error(LABEL_LOG,new Object[]{"getPixelMap","IOException"});
}
return Optional.empty();
}
}
,
也许你可以试试下面的代码:
try {
Resource resource = getResourceManager().getResource(ResourceTable.Media_icon);
PixelMapElement pixelMapElement = new PixelMapElement(resource);
PixelMap pixelMap = pixelMapElement.getPixelMap();
} catch (IOException e) {
e.printStackTrace();
} catch (NotExistException e) {
e.printStackTrace();
}
版权声明:本文内容由互联网用户自发贡献,该文观点与技术仅代表作者本人。本站仅提供信息存储空间服务,不拥有所有权,不承担相关法律责任。如发现本站有涉嫌侵权/违法违规的内容, 请发送邮件至 dio@foxmail.com 举报,一经查实,本站将立刻删除。