英文:
Get image path from SQLITE recycler view Error
问题
以下是翻译好的部分：
有谁能帮助我理解我的错误吗？
我试图实现的目标是从SQLite数据库获取图像路径并插入到RecyclerView中。包含所有图像的文件夹将位于res/drawable中。
在适配器类中，我已经声明了`Context并将其设置为私有全局变量`，并在onCreateViewHolder中添加了`context = parent.getContext();`。
还在DBModel类中，我已经将所有地方从位图更改为字符串，并且在DB文件中从blob更改为TEXT。
public void onBindViewHolder(@NonNull DBViewHolder holder, int position) {
ModelClass objModelClass = objModelClassArrayList.get(position);
holder.description_sign.setText(objModelClass.getDescription());
//context = holder.image_sign.getContext();
//int resAd = getIdentifier(image_path,"drawable",context.getPackageName());
int i = context.getResources().getIdentifier(objModelClass.getImage(),"drawable",context.getPackageName());
holder.image_sign.setImageResource(i);
//holder.image_sign.setImageBitmap(objModelClass.getImage()); <- 它有效，但我不想要那个。
}
> E/AndroidRuntime: 致命异常: 主线程
> 进程: com.example.dissertation, PID: 5449
> java.lang.NullPointerException: 名称为空
> 在 android.content.res.ResourcesImpl.getIdentifier(ResourcesImpl.java:240)
> 在 android.content.res.Resources.getIdentifier(Resources.java:1927)
英文:
Can anyone help me to understand my mistake?
What I am trying to achieve is to get the image path from SQLite dB and insert into recycler view. Folder with all images will be in res/drawable.
In adapter class, I have declared Context and is private global and in onCreateViewHolder, I added context = parent.getContext();
Also in DBModel class, I changed everywhere from bitmap to string and in DB file from blob to TEXT.
public void onBindViewHolder(@NonNull DBViewHolder holder, int position) {
ModelClass objModelClass = objModelClassArrayList.get(position);
holder.description_sign.setText(objModelClass.getDescription());
//context = holder.image_sign.getContext();
//int resAd = getIdentifier(image_path,"drawable",context.getPackageName());
int i = context.getResources().getIdentifier(objModelClass.getImage(),"drawable",context.getPackageName());
holder.image_sign.setImageResource(i);
//holder.image_sign.setImageBitmap(objModelClass.getImage()); <- It works but i don't want that.
}
> E/AndroidRuntime: FATAL EXCEPTION: main
> Process: com.example.dissertation, PID: 5449
> java.lang.NullPointerException: name is null
> at android.content.res.ResourcesImpl.getIdentifier(ResourcesImpl.java:240)
> at android.content.res.Resources.getIdentifier(Resources.java:1927)
答案1
得分: 0
String uri = "@drawable/" + objModelClass.getImage();
int imageResource = context.getResources().getIdentifier(uri, null, context.getPackageName());
Drawable res = context.getResources().getDrawable(imageResource);
holder.image_sign.setImageDrawable(res);
英文:
Could you try this code block?
String uri = "@drawable/" + objModelClass.getImage();
int imageResource = context.getResources().getIdentifier(uri, null, context.getPackageName());
Drawable res = context.getResources().getDrawable(imageResource);
holder.image_sign.setImageDrawable(res);
答案2
得分: 0
ModelClass objModelClass = objModelClassArrayList.get(position);
holder.description_sign.setText(objModelClass.getDescription());
String uri = "@drawable/" + objModelClass.getImage();
int imageResource = holder.itemView.getResources().getIdentifier(uri, null, holder.itemView.getContext().getPackageName());
holder.image_sign.setImageResource(imageResource);
还需要在onCreateViewHolder中将Context声明为全局变量，并在其中添加以下代码以引用它：context = parent.getContext();
英文:
ModelClass objModelClass = objModelClassArrayList.get(position);
holder.description_sign.setText(objModelClass.getDescription())
String uri = "@drawable/" + objModelClass.getImage();
int imageResource = holder.itemView.getResources().getIdentifier(uri, null, holder.itemView.getContext().getPackageName());
holder.image_sign.setImageResource(imageResource);
It should also be declared Context as global and in onCreateViewHolder to refer to it context = parent.getContext();
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