一个简单的中英文翻译词典学习（类似灵格斯）三
在查询之后的详细信息中，我会注意到在UI开发中关于回车键的实现功能以及在listView中展示所有信息的实现，一个查看单个单词信息怎么实现呢？
实现回车键代码功能在Android中的实现
/**
* 编辑框添加事件
*/
wordEdit.setOnKeyListener(new View.OnKeyListener() {
@Override
public boolean onKey(View v, int keyCode, KeyEvent event) {
if (event.getAction() == KeyEvent.ACTION_DOWN && keyCode == KeyEvent.KEYCODE_ENTER){
// user input enter
queryButton.performClick();
return true;
}
return false;
}
});
在Android中细心童鞋可以发现，Android中可以支持JSON格式的：
/**
* 获取查询项的信息
* @param word
* @param result
* @return
* @throws JSONException
*/
private List getAudioVoiceByJSON(String word, String result)
throws JSONException {
JSONObject jsonObject = new JSONObject(result);
JSONArray jsonArray = jsonObject.getJSONArray("s");
if (jsonArray!= null && jsonArray.length() >0){
List rt = new ArrayList();
for(int i=0;i 100){
cache.remove(cache.keySet().iterator().next());
}
cache.put(word, rt);
return rt;
}
return Collections.emptyList();
}
实现关闭页面的代码如下：
/**
* 点击返回按钮的事件
*/
backButton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
finish();
}
});
实现界面切换的代码如下：
/**
*点击一个页面的记录跳转的方法
*/
searchListView.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView arg0, View arg1, int arg2,
long arg3) {
SearchItem item = searchItemAdapter.getItems().get(arg2);
if (item != null){
//设置跳转的信息 DictActivity 当前的页面 ， DetailActivity 单词的详细情况
Intent intent = new Intent(DictActivity.this, DetailActivity.class);
//设置辅助的信息
intent.putExtra("word", item.getWord());
//设置激活的界面
startActivity(intent);
}
}
});
至于ListView在下一篇Blog中讲解。
(*^__^*) 嘻嘻……
源代码如下：
package com.easyway.android.xdict;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.Dialog;
import android.app.ProgressDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.DialogInterface.OnClickListener;
import android.os.Bundle;
import android.util.Log;
import android.view.KeyEvent;
import android.view.View;
import android.widget.AdapterView;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.AdapterView.OnItemClickListener;
/**
* 字典首界面
* @author longgangbai
* @date 2010-5-28
* @version 1.0
* @since JDK6.0
*/
public class DictActivity extends Activity {
/** Called when the activity is first created. */
/* (non-Javadoc)
* @see android.app.Activity#onCreate(android.os.Bundle)
*/
private ProgressDialog pdialog;
private SearchItemAdapter searchItemAdapter;
private static final int DIALOG_WORD_REQUIRED = 0;
private EditText wordEdit;
private Button queryButton;
private ListView searchListView;
private static Map> cache = new HashMap>();
/**
* 界面启动时使用弹出框
*/
@Override
protected Dialog onCreateDialog(int id) {
switch (id) {
case DIALOG_WORD_REQUIRED:
AlertDialog.Builder builder = new AlertDialog.Builder(
DictActivity.this);
builder.setMessage("请输入你想查询的单词！").setCancelable(false)
.setPositiveButton("确定", new OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
//设置焦点
wordEdit.setFocusable(true);
}
});
try {
return builder.create();
} catch (Exception e) {
Log.e(DictActivity.class.getName(), e.getMessage(), e);
}
break;
default:
return super.onCreateDialog(id);
}
return super.onCreateDialog(id);
}
/**
* 调用时启动线程
*/
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//设置视图
setContentView(R.layout.main);
//设置标题
setTitle("XDict");
//创建组件
createComponent();
//绑定事件
bindListener();
}
/**
* 创建组件
*/
public void createComponent(){
List items = new ArrayList();
//创建自定义的ArrayAapter的适配器对象
searchItemAdapter = new SearchItemAdapter(this, R.layout.row, items);
//获取ListView对象
searchListView = (ListView) findViewById(R.id.search_listview);
//设置适配器对象
searchListView.setAdapter(searchItemAdapter);
queryButton = (Button) findViewById(R.id.query_button);
wordEdit = (EditText) findViewById(R.id.word_edittext);
}
/**
* 绑定事件
*/
public void bindListener(){
/**
* 编辑框添加事件
*/
wordEdit.setOnKeyListener(new View.OnKeyListener() {
@Override
public boolean onKey(View v, int keyCode, KeyEvent event) {
if (event.getAction() == KeyEvent.ACTION_DOWN && keyCode == KeyEvent.KEYCODE_ENTER){
// user input enter
queryButton.performClick();
return true;
}
return false;
}
});
/**
* 查询按钮添加事件
*/
queryButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
searchItemAdapter.getItems().clear();
searchItemAdapter.notifyDataSetChanged();
String word = wordEdit.getText().toString();
if (word == null || word.trim().length() == 0){
showDialog(DIALOG_WORD_REQUIRED);
return ;
}
//添加进度条
pdialog = ProgressDialog.show(DictActivity.this, "请稍等...", "正在请求数据...", true);
//添加线程的
new Thread(){
@Override
public void run() {
final List searchItems = getSearchItems(wordEdit.getText().toString());
searchItemAdapter.getItems().addAll(searchItems);
//采用UI线程更改界面信息
runOnUiThread(new Runnable() {
@Override
public void run() {
searchItemAdapter.notifyDataSetChanged();
View noresultTextview = findViewById(R.id.nosearchresult_textview);
if (searchItems.isEmpty()){
noresultTextview.setVisibility(View.VISIBLE);
queryButton.setFocusable(true);
}else{
noresultTextview.setVisibility(View.INVISIBLE);
}
//进度条消失
pdialog.dismiss();
}
});
}
}.start();
}
});
/**
*点击一个页面的记录跳转的方法
*/
searchListView.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView arg0, View arg1, int arg2,
long arg3) {
SearchItem item = searchItemAdapter.getItems().get(arg2);
if (item != null){
//设置跳转的信息 DictActivity 当前的页面 ， DetailActivity 单词的详细情况
Intent intent = new Intent(DictActivity.this, DetailActivity.class);
//设置辅助的信息
intent.putExtra("word", item.getWord());
//设置激活的界面
startActivity(intent);
}
}
});
}
/**
* 设置查询参数
* @return
*/
public Map getDicAppParamsMap(){
Map paramsMap=new HashMap();
paramsMap.put("User-Agent", "Mozilla/5.0 (X11; U; Linux i686; zh-CN; rv:1.9.1.6) Gecko/20091215 Ubuntu/9.10 (karmic) Firefox/3.5.6");
paramsMap.put("Referer", "http://dict.cn/");
paramsMap.put("ISAJAX", "yes");
paramsMap.put("Cookie", "dictid=u; __utma=7761447.596616007.1262230974.1262230974.1262321903.2; __utmz=7761447.1262230974.1.1.utmccn=(direct)|utmcsr=(direct)|utmcmd=(none); h=%2Ffuck%2Fmy%2F%B0%B2%C8%AB%BC%EC%B2%E9%2F%CE%D2%B5%C4%2F%CD%AC%D2%E5%B4%CA%2Fshitwork%2Ffuckhead%2F; __utmc=7761447; __utmb=7761447");
paramsMap.put("Content-Type", "application/x-www-form-urlencoded; charset=UTF-8");
return paramsMap;
}
/**
* 查询相关建议的页面
* @param word
* @return
*/
private List getSearchItems(String word){
List cacheData = cache.get(word);
if (cacheData != null){
return cacheData;
}
try{
String urlString = "http://dict.cn/ajax/suggestion.php?"+"q=" + URLEncoder.encode(word,"utf-8") + "&s=all";
Map paramsMap=getDicAppParamsMap();
String result=HTTPClient.executeByHttpURLConnection(urlString, paramsMap);
if (result!=null&&result.length()>0){
return getAudioVoiceByJSON(word, result);
}
} catch (Exception e) {
Log.d(DictActivity.class.getName(), "Failed to get the search items", e);
}
return Collections.emptyList();
}
/**
* 获取查询项的信息
* @param word
* @param result
* @return
* @throws JSONException
*/
private List getAudioVoiceByJSON(String word, String result)
throws JSONException {
JSONObject jsonObject = new JSONObject(result);
JSONArray jsonArray = jsonObject.getJSONArray("s");
if (jsonArray!= null && jsonArray.length() >0){
List rt = new ArrayList();
for(int i=0;i 100){
cache.remove(cache.keySet().iterator().next());
}
cache.put(word, rt);
return rt;
}
return Collections.emptyList();
}
}