的Android變化的TextView TEXTSIZE從活動

RecyclerView適配器上

我試圖找到如何從Activity改變我RecyclerView適配器textViews，在我的活動我有兩個小部件，如increment_text_size和decrement_text_size，他們必須更改適配器textviews，的Android變化的TextView TEXTSIZE從活動

爲實現到，我上的活動創建簡單的監聽器對其進行管理：

活動：

public interface IonChangeBookContentTextSize { 
    void incrementTextSize(); 

    void decrementTextSize(); 
} 

public static void setIonChangeBookContentTextSize(IonChangeBookContentTextSize l) { 
    ionChangeBookContentTextSize = l; 
}

和點擊後W idgets我用這個監聽器適配器

活動：

@OnClick(R.id.decrement_text_size) 
public void decrement_text_size(View view) { 
    if (ionChangeBookContentTextSize != null) { 
     ionChangeBookContentTextSize.decrementTextSize(); 
    } 
} 

@OnClick(R.id.increment_text_size) 
public void increment_text_size(View view) { 
    if (ionChangeBookContentTextSize != null) { 
     ionChangeBookContentTextSize.incrementTextSize(); 
    } 
}

現在適配器我使用這個監聽

public class ShowBookContentsAdapter extends RecyclerView.Adapter<ShowBookContentsAdapter.ShowBookContentsViewHolder> { 
    private List<Contents> list; 
    private Context  context; 
    private static final int NOTE = 1; 
    public static IonChangeBottomViewVisibility ionChangeBottomViewvisibility; 
    private  ShowBookContentsViewHolder holder; 
    private  View       view; 

    public ShowBookContentsAdapter(List<Contents> items, Context mContext, IonChangeBottomViewVisibility mOnChangeBottomViewVisibility) { 
     list = items; 
     context = mContext; 
     ionChangeBottomViewvisibility = mOnChangeBottomViewVisibility; 
    } 

    @Override 
    public ShowBookContentsViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { 
     int layout = -1; 
     switch (viewType) { 
      case 0: 
       layout = R.layout.item_book_content_paragraph; 
       break; 
      case 1: 
       layout = R.layout.item_book_content_heading_one; 
       break; 
     } 

     view = LayoutInflater.from(parent.getContext()).inflate(layout, parent, false); 
     holder = new ShowBookContentsViewHolder(view); 

     return holder; 
    } 

    @Override 
    public void onBindViewHolder(ShowBookContentsViewHolder holder, final int position) { 
     switch (list.get(position).getContentType()) { 
      case 0: 
       implementingHeadingParagraphView(holder, position); 
       break; 
      case 1: 
       implementingHeadingOneView(holder, position); 
       break; 
     } 
    } 

    private void implementingHeadingParagraphView(final ShowBookContentsViewHolder holder, final int position) { 
     Utils.overrideFonts(context, holder.book_content_paragraph, PersianFontType.SHABNAM); 

     holder.book_content_paragraph.setText(Html.fromHtml(list.get(position).getContent())); 

     ActivityShowBookContent.setIonChangeBookContentTextSize(new ActivityShowBookContent.IonChangeBookContentTextSize() { 
      @Override 
      public void incrementTextSize() { 
       holder.book_content_paragraph.setTextSize(TypedValue.COMPLEX_UNIT_SP, 18); 
      } 

      @Override 
      public void decrementTextSize() { 
       holder.book_content_paragraph.setTextSize(TypedValue.COMPLEX_UNIT_SP, 12); 
      } 
     }); 
    } 

    @Override 
    public int getItemViewType(int position) { 
     return list.get(position).getContentType(); 
    } 

    @Override 
    public int getItemCount() { 
     return list.size(); 
    } 

    public int getItemPosition(int itemId) { 
     return itemPositions.get(itemId); 
    } 

    public class ShowBookContentsViewHolder extends RecyclerView.ViewHolder { 
     @Nullable 
     @BindView(R.id.book_content_paragraph) 
     TextView book_content_paragraph; 

     @Nullable 
     @BindView(R.id.book_content_heading_one) 
     TextView book_content_heading_one; 

     public ShowBookContentsViewHolder(View view) { 
      super(view); 
      ButterKnife.bind(this, view); 
     } 
    } 
}

實現這個監聽器：

ActivityShowBookContent.setIonChangeBookContentTextSize(new ActivityShowBookContent.IonChangeBookContentTextSize() { 
    @Override 
    public void incrementTextSize() { 
     holder.book_content_paragraph.setTextSize(TypedValue.COMPLEX_UNIT_SP, 18); 
    } 

    @Override 
    public void decrementTextSize() { 
     holder.book_content_paragraph.setTextSize(TypedValue.COMPLEX_UNIT_SP, 12); 
    } 
});

上implementingHeadingParagraphView方法工作的當前位置，而不是爲recyclerview適配器上的所有行，我怎麼能解決這個問題？

來源

2017-03-07 tux-world

你必須保存在數據模型類TEXTSIZE在點擊的位置，然後執行你的意見時，只需使用NotifyItemChanged（） –

並設置文字大小，從數據模型。 – faranjit

@faranjit'notifyItemChanged'只適用於當前位置並非所有適配器行 –

您不必創建一個監聽器用於此目的。您應該在適配器中保存一個名爲textSize的字段。然後，只要你想從你的活動中設置此。

public class ShowBookContentsAdapter extends RecyclerView.Adapter<ShowBookContentsAdapter.ShowBookContentsViewHolder> { 

    private int textSize; 

    // constructor etc. 

    @Override 
    public ShowBookContentsViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { 

     final View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_book_content_paragraph, parent, false); 
     final ShowBookContentsViewHolder holder new ShowBookContentsViewHolder(view); 

     return holder; 
    } 

    @Override 
    public void onBindViewHolder(ShowBookContentsViewHolder holder, final int position) { 
     implementingHeadingParagraphView(holder, position); 
    } 

    private void implementingHeadingParagraphView(final ShowBookContentsViewHolder holder, final int position) { 
     Utils.overrideFonts(context, holder.book_content_paragraph, PersianFontType.SHABNAM); 

     holder.book_content_paragraph.setTextSize(TypedValue.COMPLEX_UNIT_SP, textSize); 

     holder.book_content_paragraph.setText(Html.fromHtml(list.get(position).getContent())); 

    } 

    public void setTextSizes(int textSize) { 
     this.textSize = textSize; 
     notifyDataSetChanged(); 
    } 

    //... other adapter methods 

    public class ShowBookContentsViewHolder extends RecyclerView.ViewHolder { 
     @Nullable 
     @BindView(R.id.book_content_paragraph) 
     TextView book_content_paragraph; 

     @Nullable 
     @BindView(R.id.book_content_heading_one) 
     TextView book_content_heading_one; 

     public ShowBookContentsViewHolder(View view) { 
      super(view); 
      ButterKnife.bind(this, view); 
     } 
    }

調用該從你的活動

showBookContentsAdapter.setTextSizes(18);

來源

2017-03-07 07:28:09 sembozdemir

非常感謝您的先生 –

你必須調用從您notifydatasetchanged活動

1.首先，節省常數變量，如果字體大小的臨時或使用共享偏好，如果需要在應用程序的整個生命週期

讓您的活動的方法來保存字體大小

private void saveFontSize(boolean isFont){ 
IS_LARGE_FONT= isFont; 
recyclerView.post(new Runnable(){ 
adapter.notifyDataSetChanged(); 
}); 
}

在您的適配器類查一下bindholder

該值

if(IS_LARGE_FONT) 
{ 
//set large font 
} 
else{ 
// set small font 
}

來源

2017-03-07 07:10:34

的Android變化的TextView TEXTSIZE從活動

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