【GT-安卓应用开发之表情列表】

前言：今天无聊翻了翻之前做的一个IM程序，趁着午休时间将聊天表情部分代码摘出来记录一下。

  所谓表情消息，其实就是一串特殊格式的字符串，记得之前QQ是可以手输表情的。我的思路是将图片与名字（也就是前面说的特殊格式的字符串）进行一一对应，利用ViewPager+GridView展示表情列表，点击某一表情获取表情名字，然后转为Bitmap后再转为ImageSpan插入到EditText中。

  1、资源准备

  将所需要的表情图片放在aeest资源下，我这里直接从项目中摘出来的，也可以自己手动添加，名字格式要保持一致

  2、初始化

  定义一个List，用于保存各个图片的名字

private void initStaticFaces() {
    try {
        staticFacesList = new ArrayList<String>();
        String[] faces = getAssets().list("face/png");
        for (int i = 0; i < faces.length; i++) {
            staticFacesList.add(faces[i]);
        }
        //去掉删除图片
        staticFacesList.remove("emotion_del_normal.png");
    } catch (Exception e) {
        e.printStackTrace();
    }
}

初始化数据后初始化Viewpager

//获取页数
private int getPagerCount() {
    int count = staticFacesList.size();
    return count % (columns * rows - 1) == 0 ? count / (columns * rows - 1)
            : count / (columns * rows - 1) + 1;
}
//初始化ViewPager
private void initViewPager() {
    for (int i = 0; i < getPagerCount(); i++) {
        views.add(viewPagerItem(i));
        ViewGroup.LayoutParams params = new ViewGroup.LayoutParams(16, 16);
        mDotsLayout.addView(dotsItem(i), params);
    }
    FaceVPAdapter mVpAdapter = new FaceVPAdapter(views);
    mViewPager.setAdapter(mVpAdapter);
    mDotsLayout.getChildAt(0).setSelected(true);
}

private ImageView dotsItem(int position) {
    LayoutInflater inflater = (LayoutInflater) getSystemService(LAYOUT_INFLATER_SERVICE);
    View layout = inflater.inflate(R.layout.dot_image, null);
    ImageView iv = layout.findViewById(R.id.face_dot);
    iv.setId(position);
    return iv;
}

private View viewPagerItem(int position) {
    LayoutInflater inflater = (LayoutInflater) getSystemService(LAYOUT_INFLATER_SERVICE);
    View layout = inflater.inflate(R.layout.face_gridview, null);//表情布局
    GridView gridview = layout.findViewById(R.id.chart_face_gv);
    /**
     * 注：因为每一页末尾都有一个删除图标，所以每一页的实际表情columns *　rows　－　1; 空出最后一个位置给删除图标
     * */
    List<String> subList = new ArrayList<String>();
    subList.addAll(staticFacesList
            .subList(position * (columns * rows - 1),
                    (columns * rows - 1) * (position + 1) > staticFacesList
                            .size() ? staticFacesList.size() : (columns
                            * rows - 1)
                            * (position + 1)));
    /**
     * 末尾添加删除图标
     * */
    subList.add("emotion_del_normal.png");
    FaceGVAdapter mGvAdapter = new FaceGVAdapter(subList, this);
    gridview.setAdapter(mGvAdapter);
    gridview.setNumColumns(columns);
    return gridview;
}

  3、添加事件处理

  点击表情，将表情插入到EditText中（如果是删除则删掉EditText中最后一个表情），长按删除则清空EditText

gridview.setOnItemClickListener(new OnItemClickListener() {
    @Override
    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
        try {
            String png = ((TextView) ((LinearLayout) view).getChildAt(1)).getText().toString();
            if (!png.contains("emotion_del_normal")) {// 如果不是删除图标
                insert(getFace(png));
            } else {
                delete();
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
});
gridview.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {
    @Override
    public boolean onItemLongClick(AdapterView<?> adapterView, View view, int i, long l) {
        String png = ((TextView) ((LinearLayout) view).getChildAt(1)).getText().toString();
        if (!png.contains("emotion_del_normal")) {// 如果不是删除图标
        } else {
            deleteAll();
        }
        return false;
    }
});

  4、插入、删除以及清空

private void insert(CharSequence text) {
    int iCursorStart = Selection.getSelectionStart((input.getText()));
    int iCursorEnd = Selection.getSelectionEnd((input.getText()));
    if (iCursorStart != iCursorEnd) {
        input.getText().replace(iCursorStart, iCursorEnd, "");
    }
    int iCursor = Selection.getSelectionEnd((input.getText()));
    input.getText().insert(iCursor, text);
}
private void delete() {
    if (input.getText().length() != 0) {
        int iCursorEnd = Selection.getSelectionEnd(input.getText());
        int iCursorStart = Selection.getSelectionStart(input.getText());
        if (iCursorEnd > 0) {
            if (iCursorEnd == iCursorStart) {
                if (isDeletePng(iCursorEnd)) {
                    String st = "#[face/png/f_static_000.png]#";
                    input.getText().delete(
                            iCursorEnd - st.length(), iCursorEnd);
                } else {
                    input.getText().delete(iCursorEnd - 1,
                            iCursorEnd);
                }
            } else {
                input.getText().delete(iCursorStart,
                        iCursorEnd);
            }
        }
    }
}
private void deleteAll() {
    input.setText("");
}

  5、效果图

                               

  6、demo地址