我在google上搜索了很长时间，但我无法弄明白该怎么做。
我正在用包含3个textview的项目填充listview（1个获取数据）和2个图像按钮
我想在点击第一个按钮时获得第三个textview文本，这是我的代码，直到现在：
Search.java
public class Search extends ListActivity {
private TextView mTextView;
private ListView mListView;
private String query;
private String queryencoded;
private static Context mContext;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.search);
mTextView = (TextView) findViewById(R.id.text);
mListView = (ListView) findViewById(android.R.id.list);
mContext = getApplicationContext();
// Get the intent, verify the action and get the query
Intent intent = getIntent();
if (Intent.ACTION_SEARCH.equals(intent.getAction())) {
query = intent.getStringExtra(SearchManager.QUERY);
try {
queryencoded = URLEncoder.encode(query, "utf-8");
} catch (UnsupportedEncodingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
Log.w("myApp", "aaaaa");
Toast.makeText(Search.this, (query), Toast.LENGTH_LONG).show();
mTextView.setText("testing connexion");
if(isConnected()){
mTextView.setText("Loading...");
new HttpAsyncTask().execute("my json url");
}
else{
mTextView.setBackgroundColor(0xffcc0000);
mTextView.setText("You are NOT connected");
}
}
}
public boolean isConnected(){
ConnectivityManager connMgr = (ConnectivityManager) getSystemService(this.CONNECTIVITY_SERVICE);
NetworkInfo networkInfo = connMgr.getActiveNetworkInfo();
if (networkInfo != null && networkInfo.isConnected())
return true;
else
return false;
}
public static String GET(String url){
InputStream inputStream = null;
String result = "";
try {
// create HttpClient
HttpClient httpclient = new DefaultHttpClient();
// make GET request to the given URL
HttpResponse httpResponse = httpclient.execute(new HttpGet(url));
// receive response as inputStream
inputStream = httpResponse.getEntity().getContent();
// convert inputstream to string
if(inputStream != null)
result = convertInputStreamToString(inputStream);
else
result = "Did not work!";
} catch (Exception e) {
Log.d("InputStream", e.getLocalizedMessage());
}
return result;
}
private static String convertInputStreamToString(InputStream inputStream) throws IOException{
BufferedReader bufferedReader = new BufferedReader( new InputStreamReader(inputStream));
String line = "";
String result = "";
while((line = bufferedReader.readLine()) != null)
result += line;
inputStream.close();
return result;
}
private class HttpAsyncTask extends AsyncTask<String, Void, String> {
@Override
protected String doInBackground(String... urls) {
return GET(urls[0]);
}
// onPostExecute displays the results of the AsyncTask.
@Override
protected void onPostExecute(String result) {
Toast.makeText(getBaseContext(), "Received!", Toast.LENGTH_LONG).show();
try {
JSONObject jsonobject = new JSONObject(result);
mTextView.setText((String) jsonobject.get("count"));
Integer count = Integer.parseInt((String) jsonobject.get("count"));
if (count == 0) {
// There are no results
mTextView.setText(getString(R.string.no_results, query));
} else {
// Display the number of results
String countString = getResources().getQuantityString(R.plurals.search_results,
count, new Object[] {count, query});
mTextView.setText(countString);
// Specify the columns we want to display in the result
String[] from = new String[] { "title",
"artist",
"duration",
"url"};
// Specify the corresponding layout elements where we want the columns to go
int[] to = new int[] { R.id.title,
R.id.artist,
R.id.duration,
R.id.url};
// -- container for all of our list items
List<Map<String, String>> groupData = new ArrayList<Map<String, String>>();
// -- list item hash re-used
Map<String, String> group;
//create audio json array
JSONArray audios = jsonobject.getJSONArray("audio");
for (int i = 0; i < audios.length(); i++) {
JSONObject audio = audios.getJSONObject(i);
//get info
String title = audio.getString("title");
String artist = audio.getString("artist");
String duration = audio.getString("duration");
String durationformated = getDurationString(Integer.parseInt(duration));
String url = audio.getString("url");
// -- create record
group = new HashMap<String, String>();
group.put( "title", title );
group.put( "artist", artist );
group.put( "duration", durationformated );
group.put( "url", url );
groupData.add(group);
}
SimpleAdapter adapter = new SimpleAdapter(mContext , groupData, R.layout.result,
from,
to );
setListAdapter( adapter );
}
}
catch (JSONException e)
{
// TODO Auto-generated catch block
Log.w("myApp", "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa");
Log.w("myApp", e);
Log.w("myApp", "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa");
}
}
}
private String getDurationString(int seconds) {
int hours = seconds / 3600;
int minutes = (seconds % 3600) / 60;
seconds = seconds % 60;
return twoDigitString(minutes) + ":" + twoDigitString(seconds);
}
private String twoDigitString(int number) {
if (number == 0) {
return "00";
}
if (number / 10 == 0) {
return "0" + number;
}
return String.valueOf(number);
}
}
search.xml：
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".Search" >
<TextView
android:id="@+id/text"
android:textColor="?android:textColorPrimary"
android:background="@android:drawable/title_bar"
android:layout_width="fill_parent"
android:layout_height="wrap_content" />
<ListView
android:id="@android:id/list"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_below="@id/text"
/>
</RelativeLayout>
为result.xml：
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:padding="5dp">
<TextView
android:id="@+id/url"
android:layout_width="0dp"
android:layout_height="0dp"
android:visibility="gone"/>
<TextView
android:id="@+id/title"
style="@android:style/TextAppearance.Large"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_toLeftOf="@+id/play"
android:singleLine="true"
android:text="title"
android:textColor="#000000" />
<TextView
android:id="@+id/artist"
style="@android:style/TextAppearance.Small"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_below="@id/title"
android:layout_toLeftOf="@+id/play"
android:singleLine="true"
android:text="artist"
android:textColor="#7D7D7D" />
<TextView
android:id="@+id/duration"
style="@android:style/TextAppearance.Small"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/artist"
android:layout_alignParentBottom="true"
android:layout_below="@id/artist"
android:layout_toLeftOf="@+id/play"
android:singleLine="true"
android:text="03:24"
android:textColor="#7D7D7D" />
<ImageButton
android:id="@+id/play"
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:layout_toLeftOf="@+id/download"
android:src="@drawable/play" />
<ImageButton
android:id="@+id/download"
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:layout_alignParentRight="true"
android:src="@drawable/download" />
</RelativeLayout>
我已经在图片按钮上测试了onclick属性，但它没有奏效：url to my thread
所以我搜索了setOnItemClickListener，但我所做的就是获得nullpointerexeption。
如果您有解决方案，请告诉我，谢谢。
答案 0 :(得分：0)
您必须使用自定义ListAdapter。在getView()方法内，找到您要观看的视图并将监听器附加到该视图。
有关如何实施自定义ListAdapter的详细教程，请访问：http://www.vogella.com/articles/AndroidListView/article.html。您将要查看ArrayAdapter的示例实现。基本上，您必须创建一个对象来表示每行数据。将这些对象的数组传递给适配器，然后适配器将使用getView()方法中的数据填充每个列表项中的视图。