使用JSON数据的自定义列表适配器中的java SearchView
我想在自定义listadatper制作的listview中实现搜索，我正在解析JSON中的数据并将其保存到内部存储中，下面是我的代码
package life.quran.com.quranlife;
public class MainActivity extends ActionBarActivity {
List<Surah> surahList;
ListView lv;
EditText searchtxt;
ArrayList<String> surahNames;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ActionBar ab = getSupportActionBar();
ab.hide();
searchtxt = (EditText) findViewById(R.id.txtsearch);
surahList = new ArrayList<>();
lv = (ListView) findViewById(R.id.listView);
File f = getFilesDir();a
String filepath = f.getAbsolutePath();
File _file = new File(filepath + "/surah.json");
if (isOnline()) {
surahTask task = new surahTask();
task.execute("http://quran.life/surah.php");
} else {
String offline_data = readFromFile();
surahList = SurahJsonParser.parseData(offline_data);
displaySurah();
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
protected void displaySurah() {
final SurahAdapter adapter = new SurahAdapter(MainActivity.this,R.layout.item_template,surahList);
lv.setAdapter(adapter);
lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Surah surah = adapter.getItem(position);
String surahNo = surah.getSurah_no().toString();
String suranName = surah.getSurah_name().toString();
Intent intent = new Intent(MainActivity.this, SurahDetailsActivity.class);
intent.putExtra("_sno", surahNo);
intent.putExtra("_sname", suranName);
startActivity(intent);
}
});
searchtxt.addTextChangedListener(new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
/* Surah surahItems = new Surah();
List<Surah> newlist = new ArrayList<Surah>();
ArrayList<String> temp = new ArrayList<String>();
int textlength = searchtxt.getText().length();
newlist.clear();
for(int i = 0; i < surahNames.size(); i++) {
if(textlength <= surahNames.get(i).length()) {
if(searchtxt.getText().toString().equalsIgnoreCase((String)surahNames.get(i).subSequence(0,textlength))) {
newlist.add(surahNames.get(i));
}
}
}
lv.setAdapter(new SurahAdapter(MainActivity.this,R.layout.item_template,surahList));
*/
}
@Override
public void afterTextChanged(Editable s) {
}
});
}
private boolean isOnline() {
ConnectivityManager cm = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo netInfo = cm.getActiveNetworkInfo();
if (netInfo != null && netInfo.isConnectedOrConnecting()) {
return true;
} else {
return false;
}
}
private void writeToFile(String data) {
try {
OutputStreamWriter outputStreamWriter = new OutputStreamWriter(openFileOutput("surah.json", Context.MODE_PRIVATE));
outputStreamWriter.write(data);
outputStreamWriter.close();
} catch (IOException e) {
Log.e("Exception", "File write failed: " + e.toString());
}
}
private String readFromFile() {
String ret = "";
try {
InputStream inputStream = openFileInput("surah.json");
if (inputStream != null) {
InputStreamReader inputStreamReader = new InputStreamReader(inputStream);
BufferedReader bufferedReader = new BufferedReader(inputStreamReader);
String receiveString = "";
StringBuilder stringBuilder = new StringBuilder();
while ((receiveString = bufferedReader.readLine()) != null) {
stringBuilder.append(receiveString);
}
inputStream.close();
ret = stringBuilder.toString();
}
} catch (FileNotFoundException e) {
Log.e("login activity", "File not found: " + e.toString());
} catch (IOException e) {
Log.e("login activity", "Can not read file: " + e.toString());
}
return ret;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
private class surahTask extends AsyncTask<String, String, String> {
ProgressDialog pd;
@Override
protected void onPreExecute() {
pd = new ProgressDialog(MainActivity.this);
pd.setProgressStyle(ProgressDialog.STYLE_SPINNER);
pd.setTitle("Please Wait...");
pd.setMessage("Preparing List Of Surah..");
pd.setIndeterminate(false);
pd.setCancelable(false);
pd.show();
}
@Override
protected String doInBackground(String... params) {
surahNames = new ArrayList<>();
String content = HttpManager.getData(params[0]);
for(Surah surah : surahList) {
surahNames.add("Surah " +surah.getSurah_name());
}
writeToFile(content);
return content ;
}
@Override
protected void onPostExecute(String s) {
surahList = SurahJsonParser.parseData(s);
displaySurah();
pd.dismiss();
}
}
}
编辑
# 1 楼答案
要实现搜索，需要使用editText的textchanged事件，该事件将搜索词作为输入。您可以阅读以下链接来了解action listeners：
1）How to Apply the Textchange event on EditText
2）Counting Chars in EditText Changed Listener
获得搜索关键字后，浏览列表，并将对象与关键字匹配。然后将列表项存储在与搜索关键字匹配的单独列表中。搜索完成后，使用新创建的列表设置新适配器
祝你好运