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POAndroid: restart search thread
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17124991
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0
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2
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7
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2013-06-15T15:06:44.387
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2016-11-04T20:44:03.620
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2016-11-04T20:29:43.383
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1439382
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1439382
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1
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I have a simple <code>EditText</code> with a <code>TextChangedListener</code> and a <code>ListView</code>. The <code>onTextChanged</code> method will call the following <code>restartSearch</code> method, so the current search thread should be restarted while typing into the <code>EditText</code>. The <code>search</code> method just adds matching items to the <code>ListView</code>. When the <code>searchThread</code> is still alive, I want to cancel and restart the search so the UI doesn't freeze while typing and it doesn't take so long. <pre><code>Thread searchThread; private void restartSearch(CharSequence cs){ query = cs; if(searchThread != null && searchThread.isAlive()){ searchThread.interrupt(); } searchThread = new Thread(new Runnable() { public void run() { if(!lastSearch.equals(query)) search(query); } }); searchThread.start(); } </code></pre> The method from where I call it: <pre><code>@Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); EditText etSearch = ((EditText) findViewById(R.id.etSearch)); //... etSearch.addTextChangedListener(new TextWatcher() { @Override public void onTextChanged(CharSequence s, int start, int before, int count) { // TODO Auto-generated method stub restartSearch(s); } //... }); } </code></pre> and another (from where I also update the UI): <pre><code>final Handler handler = new Handler(){ @Override public void handleMessage(Message msg) { if(msg.what==1){ //... adapter.notifyDataSetChanged(); restartSearch(lastSearch); } else if(msg.what==2) adapter.notifyDataSetChanged(); super.handleMessage(msg); } }; </code></pre> the message <code>msg</code> is sent from the <code>search</code> method to update the UI: <pre><code>private void search(CharSequence s){ searchResults.clear(); if(!s.toString().equals("")){ for(int i=0; i<vocsCount; i++){ try{ getResult(i, 0, 2,s); getResult(i, 1, 1,s); }catch(Exception ex){} } Collections.sort(searchResults); } Message msg = handler.obtainMessage(); msg.what = 2; handler.sendMessage(msg); lastSearch = s; } </code></pre> So as it creates a new <code>Runnable</code> every time, it seems as if they all run parallel, because all search-items are added multiple times to the ListView. How can I avoid this?
Tags
<java><android><search><background-thread>
Title
Android: restart search thread
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