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我試圖獲取Android資源ID並將ImageView src設置爲來自JSON數組的特定ID。從適配器中的字符串獲取Android資源ID
我用下面的代碼
String str = mDataset.get(position).icon_res.substring(0, mDataset.get(position).icon_res.lastIndexOf('.'));
int res = Resources.getSystem().getIdentifier("ic_" + str, "drawable", this.getClass().getPackage().getName());
if(res == 0)
{
Log.d("is null", "null");
Log.d("string = ", "ic_" + str);
Log.d("package", this.getClass().getPackage().getName());
}
但從某種原因,它的檢測資源詮釋爲0包的名字似乎是正確的,字符串是正確的,但由於某種原因,它沒有找到正確的繪製資源。我在這裏做錯了什麼?
編輯:
Full adapter code
package com.xyz
import android.app.Activity;
import android.app.Application;
import android.content.Context;
import android.content.res.Resources;
import android.graphics.drawable.Drawable;
import android.media.Image;
import android.support.constraint.ConstraintLayout;
import android.support.v7.widget.RecyclerView;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.RelativeLayout;
import android.widget.TextView;
import java.util.ArrayList;
import java.util.List;
/**
* Created by Kreso on 23.3.2017..
*/
public class CategoryAdapter extends RecyclerView.Adapter<CategoryAdapter.ViewHolder>{
private List<Category> mDataset;
private Context context;
public CategoryAdapter(List<Category> categoriesList) {
mDataset = categoriesList;
}
// Provide a reference to the views for each data item
// Complex data items may need more than one view per item, and
// you provide access to all the views for a data item in a view holder
public class ViewHolder extends RecyclerView.ViewHolder {
// each data item is just a string in this case
public TextView txtHeader;
public ConstraintLayout holderLayout;
public ImageView icon;
public ViewHolder(View v) {
super(v);
txtHeader = (TextView) v.findViewById(R.id.firstLine);
holderLayout = (ConstraintLayout) v.findViewById(R.id.itemHolder);
icon = (ImageView) v.findViewById(R.id.icon);
context = v.getContext();
}
}
/*public void add(int position, String item) {
mDataset.add(position, item);
notifyItemInserted(position);
}*/
public void remove(int position) {
mDataset.remove(position);
notifyItemRemoved(position);
notifyItemRangeChanged(position, mDataset.size());
}
// Provide a suitable constructor (depends on the kind of dataset)
/* public CategoryAdapter(ArrayList<String> myDataset) {
mDataset = myDataset;
}*/
// Create new views (invoked by the layout manager)
@Override
public CategoryAdapter.ViewHolder onCreateViewHolder(ViewGroup parent,
int viewType) {
// create a new view
View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.recycler_item_row, parent, false);
// set the view's size, margins, paddings and layout parameters
ViewHolder vh = new ViewHolder(v);
return vh;
}
// Replace the contents of a view (invoked by the layout manager)
@Override
public void onBindViewHolder(ViewHolder holder, final int position) {
// - get element from your dataset at this position
// - replace the contents of the view with that element
final String name = mDataset.get(position).name;
holder.txtHeader.setText(mDataset.get(position).name);
//holder.icon.setImageResource(R.drawable.ic_beer);
String str = mDataset.get(position).icon_res.substring(0, mDataset.get(position).icon_res.lastIndexOf('.'));
int res = context.getResources().getSystem().getIdentifier("ic_" + str, "drawable", context.getPackageName());
if(res == 0)
{
Log.d("is null", "null");
Log.d("string = ", "ic_" + str);
Log.d("package", this.getClass().getPackage().getName());
}
holder.icon.setImageResource(res);
holder.holderLayout.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
remove(position);
}
});
}
// Return the size of your dataset (invoked by the layout manager)
@Override
public int getItemCount() {
return mDataset.size();
}
}
分享您的適配器的完整代碼 –
'Resources.getSystem()'不是您的軟件包的'Resources'。這就是爲什麼它沒有找到你的標識符。 –
@MikeM。我應該使用什麼?這有點令人困惑,我第一次這樣做。我的回答給了我所需的結果,但如果你的精神更好,我想知道更多關於背景的信息。 –