列表视图没有出现的这个问题似乎很奇怪。首先让我发布我在活动中涉及的功能代码:受保护的ListView mListView;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
this.setContentView(R.layout.result);
mListView = (ListView)this.findViewById(R.id.wrdList);
handleIntent(getIntent());
}
private void handleIntent(Intent intent) {
if (Intent.ACTION_SEARCH.equals(intent.getAction())) {
String word = intent.getStringExtra(SearchManager.QUERY);
//use the query to search your data somehow
//Columns to be selected in database
String sel[] = {"_id", "wort", DictDBHelper.get2LtrLang()};
Cursor SrhRet = mSrhHelper.searchWord(word, sel);
//Columns to be showed in ListView
String col[] = {"wort", DictDBHelper.get2LtrLang()};
showList(SrhRet, col);
SrhRet.close();
} else if (Intent.ACTION_VIEW.equals(intent.getAction())) {
}
}
/*
* Set the TextView to print how many words are found in database
*/
protected void setCount(int count) {
TextView tv = (TextView)this.findViewById(R.id.wrdCount);
tv.setText(String.valueOf(count));
}
/*
* Set the adapter to show the list
* First parameter specifies the cursor of rows to be shown in ListView
* Second one specifies columns
*/
protected void showList(final Cursor SrhRet, String[] from) {
int[] to = new int[]{R.id.entry, R.id.detail};
SimpleCursorAdapter adapter = new SimpleCursorAdapter(this,
R.layout.listitem, SrhRet, from, to,
CursorAdapter.FLAG_REGISTER_CONTENT_OBSERVER);
mListView.setAdapter(adapter);
setCount(mListView.getCount());
mListView.setOnItemClickListener(new OnItemClickListener(){
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
// Build the Intent used to open WordActivity with a specific word Uri
Intent wordIntent = new Intent(getApplicationContext(), WordActivity.class);
Uri data = Uri.withAppendedPath(DictionaryProvider.ENTRY_CONTENT_URI,
String.valueOf(id));
wordIntent.setData(data);
//Required by the update
SrhRet.close();
mSrhHelper.updateHist(id);
startActivity(wordIntent);
}
});
}
这些是处理可搜索输入的函数。我已经追踪了所有涉及的变量,但几乎没有发现任何异常。但是,每次我尝试此功能时,TextView 都会显示 ListView 应包含的正确数字!这些函数以前工作得很好,我有另一个从这个派生的活动调用这些工作得很好的函数。
我使用 listitem.xml 作为 ListView 项目中的内容:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<TextView
android:id="@+id/entry"
android:layout_height="wrap_content"
android:layout_width="match_parent"
android:textSize="17dp" />
<TextView
android:id="@+id/detail"
android:layout_height="wrap_content"
android:layout_width="match_parent" />
还有我的 result.xml。我已经仔细检查了方向。
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<TextView
android:id="@+id/wrdCount"
android:layout_height="wrap_content"
android:layout_width="match_parent" />
<ListView
android:id="@+id/wrdList"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1" />
</LinearLayout>
提前感谢您的帮助!