我在活动适配器中显示来自DialogFragment
上下文的Activity
时遇到问题。所以我有一个名为AddDialogFragment
的自定义类,它扩展了DialogFragment
。当我用它在我的片段适配器中显示该对话框时,一切都很顺利。我在那个片段中就像那样做了(上下文来自我的片段传递给Adapter's
构造函数:
FragmentActivity fragmentActivity = (FragmentActivity) context;
FragmentManager fragmentManager = fragmentActivity.getSupportFragmentManager();
RecipeRemoveDialogFragment recipeDialogFragment = new RecipeRemoveDialogFragment();
recipeDialogFragment.show(fragmentManager, "recipeDialogFragment");
现在我想在它的适配器中显示相同的DialogFragment
但在Activty
内。我这样做:
holder.setClickListener(new ItemClickListener2() {
@Override
public void onClick(View view, int position, boolean isLongClick) {
if (!isLongClick) {
// go to recipes site
} else {
RecipeItem recipeItem = recipeItems.get(position);
FragmentManager fragmentManager = ((FragmentActivity) context).getSupportFragmentManager();
RecipeAddDialogFragment recipeDialogFragment = new RecipeAddDialogFragment();
Log.d(TAG, "Ustawiono recipeUniqueId, coordinatorLayout oraz " +
"recipeDialogFragment w klasie RecipeAddDialogFragment");
recipeDialogFragment.setReferences(recipeItem.getRecipeUniqueID(),
coordinatorLayout, recipeDialogFragment);
Log.d(TAG, "Uruchamiam okno dialogowe RecipeAddDialogFragment");
recipeDialogFragment.show(fragmentManager, "recipeDialogFragment");
}
}
});
但是当我点击适配器的列表项时,它不起作用并且应用程序崩溃。出现错误:
12-05 18:17:47.700 8926-8926/com.example.nazwamarki.myapplication E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.nazwamarki.myapplication, PID: 8926
java.lang.ClassCastException: com.example.nazwamarki.myapplication.app.AppController cannot be cast to android.support.v4.app.FragmentActivity
at com.example.nazwamarki.myapplication.recipe.RecipeAdapter$1.onClick(RecipeAdapter.java:63)
at com.example.nazwamarki.myapplication.recipe.RecipeAdapter$ViewHolder.onLongClick(RecipeAdapter.java:119)
at android.view.View.performLongClick(View.java:4836)
at android.view.View$CheckForLongPress.run(View.java:19873)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5294)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:904)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:699)
修改
上下文来自此处(我将其传递给Adapter's
构造函数:
recipeAdapter = new RecipeAdapter(getApplicationContext(), recipeItems);
这是我的所有适配器以防万一:
public class RecipeAdapter extends RecyclerView.Adapter<RecipeAdapter.ViewHolder> {
private static String TAG = RecipeAdapter.class.getSimpleName().toString();
private Context context;
private ArrayList<RecipeItem> recipeItems;
private CoordinatorLayout coordinatorLayout;
public RecipeAdapter(Context context, ArrayList<RecipeItem> recipeItems) {
this.context = context;
this.recipeItems = recipeItems;
}
@Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.recipe_item, parent,
false);
return new ViewHolder(v);
}
@Override
public void onBindViewHolder(ViewHolder holder, int position) {
RecipeItem recipeItem = recipeItems.get(position);
Picasso.with(context).load(recipeItem.getRecipeImgThumbnailLink()).into(
holder.recipeItemImgThumbnail);
holder.recipeItemTitle.setText(recipeItem.getRecipeTitle());
holder.recipeItemKitchenMealType.setText("Kuchnia " + recipeItem.getRecipeKitchenType() +
", " + recipeItem.getRecipeMealType());
holder.recipeItemAddDate.setText(recipeItem.getRecipeAddDate());
holder.recipeItemLikeCount.setText(recipeItem.getRecipeLikeCount());
holder.setClickListener(new ItemClickListener2() {
@Override
public void onClick(View view, int position, boolean isLongClick) {
if (!isLongClick) {
// go to recipes site
} else {
RecipeItem recipeItem = recipeItems.get(position);
FragmentManager fragmentManager = ((FragmentActivity) context).getSupportFragmentManager();
RecipeAddDialogFragment recipeDialogFragment = new RecipeAddDialogFragment();
Log.d(TAG, "Ustawiono recipeUniqueId, coordinatorLayout oraz " +
"recipeDialogFragment w klasie RecipeAddDialogFragment");
recipeDialogFragment.setReferences(recipeItem.getRecipeUniqueID(),
coordinatorLayout, recipeDialogFragment);
Log.d(TAG, "Uruchamiam okno dialogowe RecipeAddDialogFragment");
recipeDialogFragment.show(fragmentManager, "recipeDialogFragment");
}
}
});
}
@Override
public int getItemCount() {
return recipeItems.size();
}
// Recipe Item Holder
class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener,
View.OnLongClickListener {
private ImageView recipeItemImgThumbnail;
private TextView recipeItemTitle;
private TextView recipeItemKitchenMealType;
private TextView recipeItemAddDate;
private TextView recipeItemLikeCount;
private ItemClickListener2 clickListener2;
public ViewHolder(View itemView) {
super(itemView);
recipeItemImgThumbnail = (ImageView) itemView.findViewById(
R.id.recipe_item_img_thumbnail);
recipeItemTitle = (TextView) itemView.findViewById(R.id.recipe_item_title);
recipeItemKitchenMealType = (TextView) itemView.findViewById(
R.id.recipe_item_kitchen_meal_type);
recipeItemAddDate = (TextView) itemView.findViewById(R.id.recipe_item_add_date);
recipeItemLikeCount = (TextView) itemView.findViewById(R.id.recipe_item_like_count);
itemView.setOnClickListener(this);
itemView.setOnLongClickListener(this);
}
public void setClickListener(ItemClickListener2 itemClickListener2) {
this.clickListener2 = itemClickListener2;
}
@Override
public void onClick(View view) {
clickListener2.onClick(view, getAdapterPosition(), false);
}
@Override
public boolean onLongClick(View view) {
clickListener2.onClick(view, getAdapterPosition(), true);
return true;
}
}
public void setCoordinatorLayout(CoordinatorLayout coordinatorLayout) {
this.coordinatorLayout = coordinatorLayout;
}
}
答案 0 :(得分:0)
更改
recipeAdapter = new RecipeAdapter(getApplicationContext(), recipeItems);
到
recipeAdapter = new RecipeAdapter(this, recipeItems);
适配器需要Activity
上下文。如果您是在回调中对其进行初始化,请使用ClassName.this
,而不是this
。
答案 1 :(得分:0)
试试这个
void showVerifyDialog() {
// Creating alert Dialog with one Button
AlertDialog.Builder alertDialog = new AlertDialog.Builder(Activity.this);
// Setting Dialog Title
alertDialog.setTitle("Forgot Password!");
// Setting Dialog Message
alertDialog.setMessage("Please Enter Your Email");
final EditText input = new EditText(Activity.this);
LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT,
LinearLayout.LayoutParams.MATCH_PARENT);
input.setLayoutParams(lp);
alertDialog.setView(input);
// alertDialog.setView(input);
// Setting Icon to Dialog
// alertDialog.setIcon(R.drawable.ic_launcher);
// alertDialog.setCancelable(false);
// Setting Positive "Yes" Button
alertDialog.setPositiveButton("YES", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
// Write your code here to execute after dialog
}
});
// Setting Negative "NO" Button
alertDialog.setNegativeButton("NO", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
// Write your code here to execute after dialog
dialog.cancel();
}
});
// Showing Alert Message
alertDialog.show();
}