Gridview与字母索引器和按字母顺序分组在android中

Question

IndexableGridView.java

public class IndexableGridView extends GridView {

private boolean mIsFastScrollEnabled = false;
private IndexGridScroller mScroller = null;
private GestureDetector mGestureDetector = null;

public IndexableGridView(Context context) {
    super(context);
}

public IndexableGridView(Context context, AttributeSet attrs) {
    super(context, attrs);
}

public IndexableGridView(Context context, AttributeSet attrs, int defStyle) {
    super(context, attrs, defStyle);
}

@Override
public boolean isFastScrollEnabled() {
    return mIsFastScrollEnabled;
}

@Override
public void setFastScrollEnabled(boolean enabled) {
    mIsFastScrollEnabled = enabled;
    if (mIsFastScrollEnabled) {
        if (mScroller == null)
            mScroller = new IndexGridScroller(getContext(), this);
    } else {
        if (mScroller != null) {
            mScroller.hide();
            mScroller = null;
        }
    }
}

@Override
public void draw(Canvas canvas) {
    super.draw(canvas);

    // Overlay index bar
    if (mScroller != null)
        mScroller.draw(canvas);
}

@Override
public boolean onTouchEvent(MotionEvent ev) {
    // Intercept ListView's touch event
    if (mScroller != null && mScroller.onTouchEvent(ev))
        return true;

    if (mGestureDetector == null) {
        mGestureDetector = new GestureDetector(getContext(), new GestureDetector.SimpleOnGestureListener() {

            @Override
            public boolean onFling(MotionEvent e1, MotionEvent e2,
                    float velocityX, float velocityY) {
                // If fling happens, index bar shows
                if (mScroller != null)
                    mScroller.show();
                return super.onFling(e1, e2, velocityX, velocityY);
            }

        });
    }
    mGestureDetector.onTouchEvent(ev);

    return super.onTouchEvent(ev);
}

@Override
public void setAdapter(ListAdapter adapter) {
    super.setAdapter(adapter);
    if (mScroller != null)
        mScroller.setAdapter(adapter);
}

@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
    super.onSizeChanged(w, h, oldw, oldh);
    if (mScroller != null)
        mScroller.onSizeChanged(w, h, oldw, oldh);
}

}

ImageAdapter.java

public class ImageAdapter extends BaseAdapter implements SectionIndexer{

    private String mSections = "#ABCDEFGHIJKLMNOPQRSTUVWXYZ";
       private Context mContext;
       List<String> mItems;

       // Constructor
       public ImageAdapter(Context c, List<String> mItems) {
          mContext = c;
          this.mItems = mItems;
       }

       public int getCount() {
          return mItems.size();
       }

       public Object getItem(int position) {
          return mItems.get(position);
       }

       public long getItemId(int position) {
          return mItems.indexOf(getItem(position));
       }

       // create a new ImageView for each item referenced by the Adapter
       public View getView(int position, View convertView, ViewGroup parent) {
          ImageView imageView;
          if (convertView == null) {
          imageView = new ImageView(mContext);
          imageView.setLayoutParams(new GridView.LayoutParams(85, 85));
          imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
          imageView.setPadding(8, 8, 8, 8);
          } else {
          imageView = (ImageView) convertView;
          }

          imageView.setImageBitmap(getBitmapFromAsset("imgs", mItems.get(position)));
          return imageView;
       }

    @Override
    public Object[] getSections() {
        // TODO Auto-generated method stub
        String[] sections = new String[mSections.length()];

        for (int i = 0; i < mSections.length(); i++)

        sections[i] = String.valueOf(mSections.charAt(i));

        return sections;
    }

    @Override
    public int getPositionForSection(int sectionIndex) {
        // TODO Auto-generated method stub
        return 0;
    }

    @Override
    public int getSectionForPosition(int position) {
        // TODO Auto-generated method stub
        for (int i = position; i >= 0; i--) {
            for (int j = 0; j < getCount(); j++) {
                if (i == 0) {
                    // For numeric section
                    for (int k = 0; k <= 9; k++) {
                        if (StringMatcher.match(String.valueOf(((String) getItem(j)).charAt(0)), String.valueOf(k)))
                            return j;
                    }
                } else {
                    if (StringMatcher.match(String.valueOf(((String) getItem(j)).charAt(0)), String.valueOf(mSections.charAt(i))))
                        return j;
                }
            }
        }
        return 0;
    }
}
private Bitmap getBitmapFromAsset(String folder, String strName)
{
    AssetManager assetManager = getResources().getAssets();
    InputStream istr = null;
    Bitmap bitmap = null;
    try {
        istr = assetManager.open(folder+"/"+strName);

    bitmap = BitmapFactory.decodeStream(istr);
    istr.close();
    } catch (IOException e) {
        e.printStackTrace();
    }
    return bitmap;
}

我在gridview上使用了上面的字母索引器代码。与this link相同。 我只是将listview更改为gridview ..现在我的问题是它没有向我显示alphaindexer在右侧。

listview索引器示例：

我想显示如下图像的数据：

Answer 1

用于排序网格：

使用名称字符串创建pojo类。然后将pojo传递给Comparator。将名称1与2进行比较并返回之前的名称。

对于分组：

基本上你需要一个标题来进行分组。使用此library（Stickygridheaders）。