无法在listview中设置数据进行搜索
我正在根据edittext中的数据对listview数据进行搜索，我的代码对于搜索功能是正确的，但是有一个问题，只有当我在edittext中输入数据进行搜索时，listview上的数据才会出现，但是我想在搜索之前显示listview中的所有数据。
这是我的代码。
public class IndexBar extends Activity implements OnItemClickListener {
HashMap<Character, Integer> alphabetToIndex;
static String TAG = "IndexBar";
int number_of_alphabets = -1;
static IndexBarHandler handler;
private EditText editsearch;
@SuppressWarnings("unused")
public IndexBar activity;
private ArrayAdapter<String> adapter1;
public ArrayAdapter<String> mainadapter;
public ArrayList<String> memberlist;
public ArrayList<String> first;
public String[] member;
public String firstname;
public String search;
ImageView imgFooterHome, imgFooterMagazine, imgFooterNews,
imgFooterClients, imgFooterAboutUs;
CustomListView mainlistview;
ImageButton back;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.indexbarlayout);
editsearch = (EditText) findViewById(R.id.textview_header);
imgFooterHome = (ImageView) findViewById(R.id.imbMemberHome);
imgFooterMagazine = (ImageView) findViewById(R.id.imbMemberMagazine);
imgFooterNews = (ImageView) findViewById(R.id.imbMembernews);
imgFooterClients = (ImageView) findViewById(R.id.imbMemberClient);
imgFooterAboutUs = (ImageView) findViewById(R.id.imbMemberAboutUs);
back = (ImageButton) findViewById(R.id.imgbtnMemberBack);
mainlistview = (CustomListView) findViewById(R.id.listView_main);
editsearch.addTextChangedListener(new TextWatcher() {
@Override
public void onTextChanged(CharSequence s, int start, int before,
int count) {
// TODO Auto-generated method stub
//mainadapter.getFilter().filter(s.toString());
}
@Override
public void beforeTextChanged(CharSequence s, int start, int count,
int after) {
// TODO Auto-generated method stub
}
@Override
public void afterTextChanged(Editable s) {
// TODO Auto-generated method stub
search = editsearch.getText().toString();
memberlist = new ArrayList<String>();
getAllMember();
if (memberlist.size() > 0) {
mainadapter = new ArrayAdapter<String>(activity,
android.R.layout.simple_dropdown_item_1line,
memberlist);
mainlistview.setAdapter(mainadapter);
}
}
});
imgFooterAboutUs.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
Intent i = new Intent(IndexBar.this, AboutUsActivity.class);
startActivity(i);
}
});
imgFooterMagazine.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent i = new Intent(IndexBar.this, MainActivity.class);
startActivity(i);
}
});
back.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
finish();
}
});
imgFooterNews.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent i = new Intent(IndexBar.this, NewsActivity.class);
startActivity(i);
}
});
imgFooterHome.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent i = new Intent(IndexBar.this, GridViewActivity.class);
startActivity(i);
}
});
getScreenHeight(this);
getScreenWidth(this);
handler = new IndexBarHandler(this);
}
// protected void onResume() {
// super.onResume();
// memberlist = new ArrayList<String>();
// /* populating the base listview */
// CustomListView mainlistview = (CustomListView) findViewById(R.id.listView_main);
// //Log.d("value of listview in onResume ", memberlist.toString());
// String main_list_array[] = getResources().getStringArray(
// R.array.base_array);
// if (main_list_array == null) {
// Log.d(TAG, "Array of the main listview is null");
// return;
// }
// getAllMember();
// mainadapter = new ArrayAdapter<String>(activity,
// android.R.layout.simple_dropdown_item_1line,
// memberlist);
// mainlistview.setAdapter(mainadapter);
// populateHashMap();
//
// }
public int convertDipToPx(int dp, Context context) { // 10dp=15px
Resources r = context.getResources();
float px = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, dp,
r.getDisplayMetrics());
return (int) px;
}
public int convertPxtoDip(int pixel) { // 15px=23dp
float scale = getResources().getDisplayMetrics().density;
int dips = (int) ((pixel / scale) + 0.5f);
return dips;
}
/**
* Determines the width of the screen in pixels
*
* @return width
*/
public int getScreenWidth(Activity activity) {
Display display = activity.getWindowManager().getDefaultDisplay();
int width = display.getWidth();
Log.d(TAG, "Screen Width in pixels=" + width);
return width;
}
/**
* Determines the height of the screen in pixels
*
* @return height
*/
public int getScreenHeight(Activity activity) {
Display display = activity.getWindowManager().getDefaultDisplay();
int height = display.getHeight();
Log.d(TAG, "Screen Height in pixels=" + height);
return height;
}
public float pixelsToSp(Context context, Float px) {
float scaledDensity = context.getResources().getDisplayMetrics().scaledDensity;
Log.d(TAG, "GetTextSize in pixels=" + px + " In Sp="
+ (px / scaledDensity));
return px / scaledDensity;
}
public void onItemClick(AdapterView<?> arg0, View view, int arg2, long arg3) {
if (!(view instanceof TextView || view == null))
return;
TextView rowview = (TextView) view;
CharSequence alpahbet = rowview.getText();
if (alpahbet == null || alpahbet.equals(""))
return;
String selected_alpahbet = alpahbet.toString().trim();
Integer position = alphabetToIndex.get(selected_alpahbet.charAt(0));
Log.d(TAG, "Selected Alphabet is:" + selected_alpahbet
+ " position is:" + position);
ListView listview = (ListView) findViewById(R.id.listView_main);
listview.setSelection(position);
}
/**
* This populates the HashMap which contains the mapping between the
* alphabets and their relative position index.
*/
private void populateHashMap() {
alphabetToIndex = new HashMap<Character, Integer>();
String base_list[] = getResources().getStringArray(R.array.base_array);
int base_list_length = base_list.length;
for (int i = 0; i < base_list_length; i++) {
char firstCharacter = base_list[i].charAt(0);
boolean presentOrNot = alphabetToIndex.containsKey(firstCharacter);
if (!presentOrNot) {
alphabetToIndex.put(firstCharacter, i);
// Log.d(TAG,"Character="+firstCharacter+" position="+i);
}
}
number_of_alphabets = alphabetToIndex.size(); // Number of enteries in
String alphabets[] = getResources().getStringArray(
R.array.alphabtes_array);
int index = -1;
for (String alpha1 : alphabets) {
char alpha = alpha1.charAt(0);
index++;
if (alphabetToIndex.containsKey(alpha))
continue;
for (int i = index + 1; i < 26; i++) { // start from next character
// to last character
char searchAlphabet = alphabets[i].charAt(0);
if (alphabetToIndex.containsKey(searchAlphabet)) {
alphabetToIndex.put(alpha,
alphabetToIndex.get(searchAlphabet));
break;
} else if (i == 25)
alphabetToIndex.put(alpha, base_list_length - 1);
else
continue;
}//
}//
}
public void getAllMember() {
new AsyncTask<Void, Void, String>() {
ProgressDialog mProgressDialog;
public String firstname;
protected void onPostExecute(String result) {
mProgressDialog.dismiss();
memberlist = new ArrayList<String>();
first = new ArrayList<String>();
try {
JSONObject jsob = new JSONObject(result.toString());
if (jsob.getString("msg").equalsIgnoreCase("Success")) {
JSONArray datajson = jsob.getJSONArray("data");
for (int i = 0; i < datajson.length(); i++) {
JSONObject c = datajson.getJSONObject(i);
firstname = c.getString("vUsername");
Log.d("firstname val", firstname);
memberlist.add(firstname);
}
if (datajson.length() > 0) {
mainadapter = new ArrayAdapter<String>(
activity,
android.R.layout.simple_dropdown_item_1line,
memberlist);
mainlistview.setAdapter(mainadapter);
} else {
System.out.println("data eorr");
}
}
} catch (Exception e) {
Log.e("login problem", "" + e);
}
}
private void startActivity(Intent i) {
// TODO Auto-generated method stub
}
@Override
protected String doInBackground(Void... arg0) {
// Creating service handler class instance
try {
HttpPost httppost1 = null;
HttpClient httpclient1 = new DefaultHttpClient();
httppost1 = new HttpPost(JsonKey.MAIN_URL);
// Add your data
List<NameValuePair> nameValuePairs1 = new ArrayList<NameValuePair>(
2);
nameValuePairs1.add(new BasicNameValuePair("action",
"SearchMemberByKeyword"));
nameValuePairs1.add(new BasicNameValuePair(
"search_membername", search));
httppost1.setEntity(new UrlEncodedFormEntity(
nameValuePairs1));
// Execute HTTP Post Request
HttpResponse response1 = httpclient1.execute(httppost1);
BufferedReader in1 = new BufferedReader(
new InputStreamReader(response1.getEntity()
.getContent()));
StringBuffer sb1 = new StringBuffer("");
String line1 = "";
while ((line1 = in1.readLine()) != null) {
sb1.append(line1);
}
in1.close();
Log.e(" Get All magazine original data", sb1.toString());
return sb1.toString();
} catch (Exception e) {
Log.e("Get All magazine response problem", "" + e);
return " ";
}
}
@Override
protected void onPreExecute() {
// TODO Auto-generated method stub
super.onPreExecute();
mProgressDialog = new ProgressDialog(IndexBar.this);
mProgressDialog.setTitle("");
mProgressDialog.setCanceledOnTouchOutside(false);
mProgressDialog.setMessage("Please Wait...");
mProgressDialog.show();
}
}.execute();
}
}
logcat:01-30 17:33:23.926:E/AndroidRuntime（782）：在android上。应用程序。活动线程。handleLaunchActivity（ActivityThread.java:2084）01-30 17:33:23.926:E/AndroidRuntime（782）：在android上。应用程序。活动线程。在android上访问$600（ActivityThread.java:130）01-30 17:33:23.926:E/AndroidRuntime（782）。应用程序。ActivityThread$H.handleMessage（ActivityThread.java:1195）01-30 17:33:23.926:E/AndroidRuntime（782）：在android上。操作系统。汉德勒。dispatchMessage（Handler.java:99）01-30 17:33:23.926:E/AndroidRuntime（782）：在android上。操作系统。活套。loop（Looper.java:137）01-30 17:33:23.926:E/AndroidRuntime（782）：在android上。应用程序。活动线程。main（ActivityThread.java:4745）01-30 17:33:23.926:E/AndroidRuntime（782）：在java。朗，反思一下。方法Invokenactive（本机方法）01-30 17:33:23.926:E/AndroidRuntime（782）：在java。朗，反思一下。方法invoke（Method.java:511）01-30 17:33:23.926:E/AndroidRuntime（782）：在com上。Android内部的操作系统。ZygoteInit$MethodandArgscaler。运行（zyteinit.java:786）01-30 17:33:23.926:E/AndroidRuntime（782）：在com上。Android内部的操作系统。合子体。main（zyteinit.java:553）01-30 17:33:23.926:E/AndroidRuntime（782）：在dalvik。系统原生艺术。main（原生方法）01-30 17:33:23.926:E/AndroidRuntime（782）：由java引起。lang.NullPointerException 01-30 17:33:23.926:E/AndroidRuntime（782）：在android上。小装置。ArrayAdapter。init（ArrayAdapter.java:310）01-30 17:33:23.926:E/AndroidRuntime（782）：在android上。小装置。ArrayAdapter。（ArrayAdapter.java:153）01-30 17:33:23.926:E/AndroidRuntime（782）：在com上。实例ncpa。IndexBar。android:723.android:723。应用程序。活动performCreate（Activity.java:5008）01-30 17:33:23.926:E/AndroidRuntime（782）：在android上。应用程序。仪器仪表。callActivityOnCreate（Instrumentation.java:1079）01-30 17:33:23.926:E/AndroidRuntime（782）：在android上。应用程序。活动线程。performLaunchActivity（ActivityThread.java:2023）
共有1个答案
首先设置下面的代码，然后在edittext-aftertextchanged方法中调用notifydatasetchanged方法。
mainadapter = new ArrayAdapter<String>(activity,
android.R.layout.simple_dropdown_item_1line,
memberlist);
mainlistview.setAdapter(mainadapter);
-
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