Listview显示的是一些行而不是所有项目（有时候，它什么也没显示），我无法理解为什么会这样。它发生在第一次运行。之后，它运行良好，屏幕上填充了数据库中的所有项目。我将垂直方向放在我的线性布局xml文件和wrap_content高度中。但问题没有解决。
这是我的主要活动：
public class MainActivity extends Activity {
public static final String PREFS_NAME = "MyPrefsFile1";
private TextView mTextView;
private ListView mListView;
ArrayList<WordDefinition> allWordDefinitions=new ArrayList<WordDefinition>();
DictionaryDatabase DictionaryDatabase;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mTextView = (TextView) findViewById(R.id.text);
mListView = (ListView) findViewById(R.id.list);
DictionaryDatabase=new DictionaryDatabase(this);
allWordDefinitions=DictionaryDatabase.getAllWords();
Collections.sort(allWordDefinitions, new CustomComparator());
mListView.setAdapter(new BaseAdapter() {
@Override
public View getView(int position, View view, ViewGroup arg2) {
if (view==null) {
view=getLayoutInflater().inflate(R.layout.list_item, arg2, false);
}
TextView textView=(TextView) view.findViewById(R.id.listItemTextView);
textView.setText(allWordDefinitions.get(position).word);
return view;
}
@Override
public long getItemId(int arg0) {
// TODO Auto-generated method stub
return 0;
}
@Override
public Object getItem(int arg0) {
// TODO Auto-generated method stub
return null;
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return allWordDefinitions.size();
}
});
mListView.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> arg0, View view, int position,
long arg3) {
Intent intent =new Intent(MainActivity.this, WordDefinitionDetailActivity.class);
intent.putExtra("word", allWordDefinitions.get(position).word);
intent.putExtra("definition", allWordDefinitions.get(position).definition);
startActivity(intent);
}
});
handleIntent(getIntent());
}
@Override
protected void onNewIntent(Intent intent) {
handleIntent(intent);
}
private void handleIntent(Intent intent) {
if (Intent.ACTION_VIEW.equals(intent.getAction())) {
Intent wordIntent = new Intent(this, WordActivity.class);
this.finish();
wordIntent.setData(intent.getData());
startActivity(wordIntent);
} else if (Intent.ACTION_SEARCH.equals(intent.getAction())) {
String query = intent.getStringExtra(SearchManager.QUERY);
showResults(query);
}
}
private void showResults(String query) {
Cursor cursor = managedQuery(DictionaryProvider.CONTENT_URI, null, null,
new String[] {query}, null);
if (cursor == null) {
mTextView.setText(getString(R.string.no_results, new Object[] {query}));
} else {
int count = cursor.getCount();
String countString = getResources().getQuantityString(R.plurals.search_results,
count, new Object[] {count, query});
mTextView.setText(countString);
String[] from = new String[] { DictionaryDatabase.KEY_WORD,
DictionaryDatabase.KEY_DEFINITION };
int[] to = new int[] { R.id.word,
R.id.definition };
SimpleCursorAdapter words = new SimpleCursorAdapter(this,
R.layout.result, cursor, from, to);
mListView.setAdapter(words);
mListView.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Intent wordIntent = new Intent(getApplicationContext(), WordActivity.class);
Uri data = Uri.withAppendedPath(DictionaryProvider.CONTENT_URI,
String.valueOf(id));
wordIntent.setData(data);
startActivity(wordIntent);
}
});
}
}
public class CustomComparator implements Comparator<WordDefinition> {
@Override
public int compare(WordDefinition p1, WordDefinition p2) {
return p1.word.compareTo(p2.word);
}
}
}
WorDefinition（Array List）：
public class WordDefinition {
String word,definition;
public WordDefinition(String word,ArrayList<String> alldefinition) {
this.word=word;
StringBuilder stringBuilder=new StringBuilder();
for (String string : alldefinition) {
stringBuilder.append(string);
}
this.word=stringBuilder.toString();
}
public WordDefinition(String word,String alldefinition) {
this.word=word;
this.definition=alldefinition;
}
}
DictionaryDatabase（摘录）
public ArrayList<WordDefinition> getAllWords() {
ArrayList<WordDefinition> arrayList=new ArrayList<WordDefinition>();
SQLiteDatabase database=mDatabaseOpenHelper.getReadableDatabase();
String selectAllQueryString="SELECT * FROM "+FTS_VIRTUAL_TABLE;
Cursor cursor=database.rawQuery(selectAllQueryString, null);
if (cursor.moveToFirst()) {
do {
WordDefinition wordDefinition=new WordDefinition(cursor.getString(cursor.getColumnIndex(KEY_WORD)), cursor.getString(cursor.getColumnIndex(KEY_DEFINITION)));
arrayList.add(wordDefinition);
} while (cursor.moveToNext());
}
return arrayList;
}
主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"
android:background="@drawable/fundoeua"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
>
<LinearLayout
android:id="@+id/Line1"
android:orientation="vertical"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<TextView
android:id="@+id/text"
android:textColor="#FFFFFF"
android:gravity="right"
android:textAlignment="gravity"
android:paddingTop="5dp"
android:paddingBottom="5dp"
android:paddingRight="15dp"
android:textStyle="bold"
android:textSize="20sp"
android:text="@string/chamada"
android:background="@color/vermelho"
android:layout_width="fill_parent"
android:layout_height="wrap_content" />
<ListView
android:id="@+id/list"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:divider="#ff0000"
android:dividerHeight="4px"
/>
</LinearLayout>
</RelativeLayout>
list_item.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="@drawable/seletor2"
android:orientation="vertical" >
<TextView
android:id="@+id/listItemTextView"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:padding="5dp"
android:textColor="@color/preto"
android:text="Large Text"
android:textAppearance="?android:attr/textAppearanceLarge" />
</LinearLayout>