【发布时间】：2014-10-11 01:10:00
【问题描述】：
我正在使用英语到波斯语词典...
不幸的是，我无法在我的项目中使用 Lazzy Listview 示例，
我的项目最初有一个列表，filter 从数据库中提取了大约 50000 个单词，因此出现输入和更新列表缓慢的情况，请帮助我在我的项目中使用 Lazzy Listview 并使用优化的过滤器来减少内存的使用并提高速度....
天呐
这是我的课：
MainActivity
public class MainActivity extends Activity {
ListView list;
ImageView clearText;
EditText editsearch;
Typeface edtSearchFont;
static String[] word;
static int[] index;
static ListViewAdapter adapter;
static ArrayList<ListViewStruct> arrayStructList = new ArrayList<ListViewStruct>();
Context context;
// onCreate
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.listview_main);
context = this;
Cursor en = G.database.rawQuery("SELECT * FROM English", null);
word = new String[en.getCount()];
index = new int[en.getCount()];
int i = 0;
ListViewStruct wp = null;
if (en.moveToFirst())
{
do
{
try {
word[i] = en.getString(en.getColumnIndex("English_Word"));
index[i] = en.getInt(en.getColumnIndex("Word_ID"));
wp = new ListViewStruct(word[i], index[i]);
arrayStructList.add(wp);
i++;
}
catch (Exception e) {
e.printStackTrace();
}
}
while (en.moveToNext());
}
en.close();
list = (ListView) findViewById(R.id.listview);
adapter = new ListViewAdapter(this, arrayStructList);
list.setAdapter(adapter);
editsearch = (EditText) findViewById(R.id.search);
edtSearchFont = Typeface.createFromAsset(context.getAssets(), "fonts/listFont.ttf");
editsearch.setTypeface(edtSearchFont);
editsearch.addTextChangedListener(new TextWatcher() {
@Override
public void afterTextChanged(Editable arg0) {
// TODO Auto-generated method stub
}
@Override
public void beforeTextChanged(CharSequence arg0, int arg1,
int arg2, int arg3) {
// TODO Auto-generated method stub
}
@Override
public void onTextChanged(CharSequence arg0, int arg1, int arg2, int arg3) {
String text = editsearch.getText().toString().toLowerCase(Locale.getDefault());
adapter.filter(text);
}
});
clearText = (ImageView) findViewById(R.id.clearTextImage);
clearText.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
editsearch.setText("");
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
//getMenuInflater().inflate(R.menu.activity_main, menu);
menu.add(0, 1, 1, "About");
menu.add(0, 2, 2, "Exit");
return true;
}
//@SuppressWarnings("deprecation")
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// TODO Auto-generated method stub
switch (item.getItemId()) {
case 1: {
AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
builder.setTitle("About")
.setMessage("\n" + "© Copyright" + "\n" + "Hossein Tahmasebi , 2014" + "\n")
.setCancelable(false)
.setIcon(R.drawable.logo)
.setNegativeButton("Ok", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int id) {
dialog.cancel();
}
});
AlertDialog alert = builder.create();
alert.show();
break;
}
case 2: {
this.finish();
}
}
return super.onOptionsItemSelected(item);
};
}
ListViewAdapter
public class ListViewAdapter extends BaseAdapter {
// Declare Variables
Context mContext;
LayoutInflater inflater;
private List<ListViewStruct> localWordsList;
private ArrayList<ListViewStruct> arraystructlist;
public int index;
Typeface listFont;
public ListViewAdapter(Context context, List<ListViewStruct> mainWordList) {
mContext = context;
this.localWordsList = mainWordList;
inflater = LayoutInflater.from(mContext);
this.arraystructlist = new ArrayList<ListViewStruct>();
this.arraystructlist.addAll(mainWordList);
}
public class ViewHolder {
TextView word;
}
@Override
public int getCount() {
return localWordsList.size();
}
@Override
public ListViewStruct getItem(int position) {
return localWordsList.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(final int position, View view, ViewGroup parent) {
final ViewHolder holder;
listFont = Typeface.createFromAsset(mContext.getAssets(), "fonts/listFont.ttf");
if (view == null) {
holder = new ViewHolder();
view = inflater.inflate(R.layout.listview_item, null);
holder.word = (TextView) view.findViewById(R.id.word);
view.setTag(holder);
} else {
holder = (ViewHolder) view.getTag();
}
holder.word.setText(localWordsList.get(position).getWord());
holder.word.setTypeface(listFont);
view.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
Intent intent = new Intent(mContext, enTranslatedResultActivity.class);
intent.putExtra("index", (localWordsList.get(position).getIndex()));
intent.putExtra("word", (localWordsList.get(position).getWord()));
mContext.startActivity(intent);
}
});
return view;
}
// Filter Class
public void filter(String charText) {
charText = charText.toLowerCase(Locale.getDefault());
localWordsList.clear();
if (charText.length() == 0) {
localWordsList.addAll(arraystructlist);
}
else
{
for (ListViewStruct wp: arraystructlist)
{
if (wp.getWord().toLowerCase(Locale.getDefault()).startsWith(charText))
{
localWordsList.add(wp);
}
}
}
notifyDataSetChanged();
}
}
ListViewStruct
public class ListViewStruct {
private int index;
private String word;
private String translatedWord;
public ListViewStruct(String word, int index) {
this.word = word;
this.index = index;
}
public int getIndex() {
return this.index;
}
public String getWord() {
return this.word;
}
public String getPopulation() {
return this.translatedWord;
}
}
G class , HelperIO 和 enTranslatedResultActivity 用于显示翻译结果字.....
如果这些课程需要在这里，告诉我把它们，
感谢您的关注.....
【问题讨论】：
-
使用 SimpleCursorAdapter，因为您的数据来自 sqlite 数据库
-
请按你说的编辑我的代码，我是初学者
-
你尝试过使用光标适配器吗？对于这种类型的列表，它比其他人快得多
-
@MHP 请编辑我的代码并告诉我如何在此处使用光标适配器
标签： android database listview dictionary filter