android 实现类似qq表情

在自己做一个聊天应用练习的时候，需要用到表情，于是就想着模仿一下QQ表情，图片资源完全copy的QQ.apk，解压就可以得到，这里不细说。

下面将该应用中的表情模块功能抽离出来，以便自己以后复习回顾。。

先看一下效果图：

首先进入界面：（完全仿照QQ）



点击一下上面的表情图标：



选择一些表情，输入一些文字混合：



点击发送：



可以看到文字和表情图片都一起显示出来了。

下面列出一些关键代码：

表情工具类ExpressionUtil:

[java] view
plaincopy

public class ExpressionUtil {

/**

* 对spanableString进行正则判断，如果符合要求，则以表情图片代替

* @param context

* @param spannableString

* @param patten

* @param start

* @throws SecurityException

* @throws NoSuchFieldException

* @throws NumberFormatException

* @throws IllegalArgumentException

* @throws IllegalAccessException

*/

public static void dealExpression(Context context,SpannableString spannableString, Pattern patten, int start) throws SecurityException, NoSuchFieldException, NumberFormatException, IllegalArgumentException, IllegalAccessException {

Matcher matcher = patten.matcher(spannableString);

while (matcher.find()) {

String key = matcher.group();

if (matcher.start() < start) {

continue;

}

Field field = R.drawable.class.getDeclaredField(key);

int resId = Integer.parseInt(field.get(null).toString()); //通过上面匹配得到的字符串来生成图片资源id

if (resId != 0) {

Bitmap bitmap = BitmapFactory.decodeResource(context.getResources(), resId);

ImageSpan imageSpan = new ImageSpan(bitmap); //通过图片资源id来得到bitmap，用一个ImageSpan来包装

int end = matcher.start() + key.length(); //计算该图片名字的长度，也就是要替换的字符串的长度

spannableString.setSpan(imageSpan, matcher.start(), end, Spannable.SPAN_INCLUSIVE_EXCLUSIVE); //将该图片替换字符串中规定的位置中

if (end < spannableString.length()) { //如果整个字符串还未验证完，则继续。。

dealExpression(context,spannableString, patten, end);

}

break;

}

}

}

/**

* 得到一个SpanableString对象，通过传入的字符串,并进行正则判断

* @param context

* @param str

* @return

*/

public static SpannableString getExpressionString(Context context,String str,String zhengze){

SpannableString spannableString = new SpannableString(str);

Pattern sinaPatten = Pattern.compile(zhengze, Pattern.CASE_INSENSITIVE); //通过传入的正则表达式来生成一个pattern

try {

dealExpression(context,spannableString, sinaPatten, 0);

} catch (Exception e) {

Log.e("dealExpression", e.getMessage());

}

return spannableString;

}

}

在显示聊天页面的list的适配器中，我们需要做如下的显示，即调用上面工具类的方法：

SimpleChatAdapter中的内部类ViewHolder：

[java] view
plaincopy

private class ViewHolder{

RelativeLayout chat_layout;

ImageView image;

TextView text;

public ViewHolder(View convertView){

chat_layout=(RelativeLayout) convertView.findViewById(R.id.team_singlechat_id_listiteam);

image=(ImageView) convertView.findViewById(R.id.team_singlechat_id_listiteam_headicon);

text=(TextView) convertView.findViewById(R.id.team_singlechat_id_listiteam_message);

}

public void setData(MessageInfo msg){

RelativeLayout.LayoutParams rl_chat_left=((RelativeLayout.LayoutParams)chat_layout.getLayoutParams());

RelativeLayout.LayoutParams rl_tv_msg_left=((RelativeLayout.LayoutParams)text.getLayoutParams());

RelativeLayout.LayoutParams rl_iv_headicon_left=((RelativeLayout.LayoutParams)image.getLayoutParams());

if(!DicqConstant.DEFAULTMAC.equalsIgnoreCase(msg.getUsermac())){ //根据本地的mac地址来判断该条信息是属于本人所说还是对方所说

//如果是自己说的，则显示在右边；如果是对方所说，则显示在左边

rl_chat_left.addRule(RelativeLayout.ALIGN_PARENT_LEFT,-1);

rl_chat_left.addRule(RelativeLayout.ALIGN_PARENT_RIGHT,0);

rl_iv_headicon_left.addRule(RelativeLayout.ALIGN_PARENT_LEFT,-1);

rl_iv_headicon_left.addRule(RelativeLayout.ALIGN_PARENT_RIGHT,0);

rl_tv_msg_left.addRule(RelativeLayout.RIGHT_OF,R.id.team_singlechat_id_listiteam_headicon);

rl_tv_msg_left.addRule(RelativeLayout.LEFT_OF,0);

text.setBackgroundResource(R.drawable.balloon_l_selector);

}else{

rl_chat_left.addRule(RelativeLayout.ALIGN_PARENT_LEFT,0);

rl_chat_left.addRule(RelativeLayout.ALIGN_PARENT_RIGHT,-1);

rl_iv_headicon_left.addRule(RelativeLayout.ALIGN_PARENT_LEFT,0);

rl_iv_headicon_left.addRule(RelativeLayout.ALIGN_PARENT_RIGHT,-1);

rl_tv_msg_left.addRule(RelativeLayout.RIGHT_OF,0);

rl_tv_msg_left.addRule(RelativeLayout.LEFT_OF,R.id.team_singlechat_id_listiteam_headicon);

text.setBackgroundResource(R.drawable.balloon_r_selector);

}

image.setImageResource(PrortaitUtils.conversionIdToRes(msg.getProtrait())); //设置头像

String str = msg.getMsg(); //消息具体内容

String zhengze = "f0[0-9]{2}|f10[0-7]"; //正则表达式，用来判断消息内是否有表情

try {

SpannableString spannableString = ExpressionUtil.getExpressionString(context, str, zhengze);

text.setText(spannableString);

} catch (NumberFormatException e) {

e.printStackTrace();

} catch (SecurityException e) {

e.printStackTrace();

} catch (IllegalArgumentException e) {

e.printStackTrace();

}

}

}

关于表情弹出框的实现如下：

MainActivity：

[java] view
plaincopy

/**

* 创建一个表情选择对话框

*/

private void createExpressionDialog() {

builder = new Dialog(MainActivity.this);

GridView gridView = createGridView();

builder.setContentView(gridView);

builder.setTitle("默认表情");

builder.show();

gridView.setOnItemClickListener(new OnItemClickListener() {

@Override

public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,

long arg3) {

Bitmap bitmap = null;

bitmap = BitmapFactory.decodeResource(getResources(), imageIds[arg2 % imageIds.length]);

ImageSpan imageSpan = new ImageSpan(MainActivity.this, bitmap);

String str = null;

if(arg2<10){

str = "f00"+arg2;

}else if(arg2<100){

str = "f0"+arg2;

}else{

str = "f"+arg2;

}

SpannableString spannableString = new SpannableString(str);

spannableString.setSpan(imageSpan, 0, 4, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);

edit.append(spannableString);

builder.dismiss();

}

});

}

/**

* 生成一个表情对话框中的gridview

* @return

*/

private GridView createGridView() {

final GridView view = new GridView(this);

List<Map<String,Object>> listItems = new ArrayList<Map<String,Object>>();

//生成107个表情的id，封装

for(int i = 0; i < 107; i++){

try {

if(i<10){

Field field = R.drawable.class.getDeclaredField("f00" + i);

int resourceId = Integer.parseInt(field.get(null).toString());

imageIds[i] = resourceId;

}else if(i<100){

Field field = R.drawable.class.getDeclaredField("f0" + i);

int resourceId = Integer.parseInt(field.get(null).toString());

imageIds[i] = resourceId;

}else{

Field field = R.drawable.class.getDeclaredField("f" + i);

int resourceId = Integer.parseInt(field.get(null).toString());

imageIds[i] = resourceId;

}

} catch (NumberFormatException e) {

e.printStackTrace();

} catch (SecurityException e) {

e.printStackTrace();

} catch (IllegalArgumentException e) {

e.printStackTrace();

} catch (NoSuchFieldException e) {

e.printStackTrace();

} catch (IllegalAccessException e) {

e.printStackTrace();

}

Map<String,Object> listItem = new HashMap<String,Object>();

listItem.put("image", imageIds[i]);

listItems.add(listItem);

}

SimpleAdapter simpleAdapter = new SimpleAdapter(this, listItems, R.layout.team_layout_single_expression_cell, new String[]{"image"}, new int[]{R.id.image});

view.setAdapter(simpleAdapter);

view.setNumColumns(6);

view.setBackgroundColor(Color.rgb(214, 211, 214));

view.setHorizontalSpacing(1);

view.setVerticalSpacing(1);

view.setLayoutParams(new LayoutParams(LayoutParams.FILL_PARENT,LayoutParams.WRAP_CONTENT));

view.setGravity(Gravity.CENTER);

return view;

}

原文地址：/article/8757745.html

demo下载：http://download.csdn.net/detail/duancanmeng/4382260