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我不能從適配器點擊reckclerview onclickListener傳遞意圖。當我點擊任何項目時,應用程序停止。這裏是登錄貓....RecyclerView onClickListener不起作用
Process: com.example.ilias.materialdsgn, PID: 3685
java.lang.NullPointerException: Attempt to invoke virtual method
java.lang.String android.content.Context.getPackageName() on a null object reference
at android.content.ComponentName.<init>(ComponentName.java:128)
at android.content.Intent.<init>(Intent.java:4449)
at com.example.ilias.materialdsgn.VivzAdapter$MyViewHolder.onClick(VivzAdapter.java:72)
at android.view.View.performClick(View.java:5198)
at android.view.View$PerformClick.run(View.java:21147)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)`
和我的適配器代碼...
public class VivzAdapter extends RecyclerView.Adapter<VivzAdapter.MyViewHolder>{
private LayoutInflater infater;
List<Information> data= Collections.emptyList();
private Context context;
public VivzAdapter(Context context, List<Information> data){
infater=LayoutInflater.from(context);
this.data=data;
}
@Override
public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view= infater.inflate(R.layout.custom_row, parent,false);
MyViewHolder viewHolder=new MyViewHolder(view);
return viewHolder;
}
@Override
public void onBindViewHolder(MyViewHolder holder, int position) {
Information current=data.get(position);
holder.title.setText(current.iconName);
holder.icon.setImageResource(current.iconId);
}
@Override
public int getItemCount() {
return data.size();
}
public void delete(int position){
data.remove(position);
notifyItemRemoved(position);
}
class MyViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener{
TextView title;
ImageView icon;
public MyViewHolder(View itemView) {
super(itemView);
itemView.setOnClickListener(this);
title= (TextView) itemView.findViewById(R.id.listText);
icon= (ImageView) itemView.findViewById(R.id.listIcon);
icon.setOnClickListener(this);
}
@Override
public void onClick(View v) {
context.startActivity(new Intent(context, SubActivity.class));
}
}
}
你永遠不會在構造函數中分配成員'context'。也就是'this.context = context;'。 –
您的錯誤表明您的上下文爲空。這個錯誤發生在VivzAdapter的第72行。 – yennsarah
處理onClick在適配器是不好的做法。將事件發送到創建適配器的對象。 – wisemann