简单的游标适配器和ListView [英] Simple Cursor Adapter and Listview
本文介绍了简单的游标适配器和ListView的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我有一个列表视图中要显示在我的主要活动从数据库中的所有条目。我用一个简单的游标适配器，但是当我运行的Android应用程序，它崩溃。应用程序停止并结束。蹊跷的happenning。
I have a Listview that should show all entries from database in my main activity. I'm using a Simple Cursor Adapter, but when I run as android application, it crashes. The application is stopped and finished. Something wrong is happenning.
崩溃的迹
03-27 00:23:50.555: E/cm value(1589): false
03-27 00:23:59.643: E/AndroidRuntime(1589): FATAL EXCEPTION: main
03-27 00:23:59.643: E/AndroidRuntime(1589): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.ec.idiomas/com.ec.idiomas.BancoDictionary}: java.lang.IllegalArgumentException: selectionArgs must be provided for the Uri: content://com.ec.idiomas.searchabledict.DictionaryProvider/dictionary
03-27 00:23:59.643: E/AndroidRuntime(1589): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2059)
03-27 00:23:59.643: E/AndroidRuntime(1589): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084)
03-27 00:23:59.643: E/AndroidRuntime(1589): at android.app.ActivityThread.access$600(ActivityThread.java:130)
03-27 00:23:59.643: E/AndroidRuntime(1589): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195)
03-27 00:23:59.643: E/AndroidRuntime(1589): at android.os.Handler.dispatchMessage(Handler.java:99)
03-27 00:23:59.643: E/AndroidRuntime(1589): at android.os.Looper.loop(Looper.java:137)
03-27 00:23:59.643: E/AndroidRuntime(1589): at android.app.ActivityThread.main(ActivityThread.java:4745)
03-27 00:23:59.643: E/AndroidRuntime(1589): at java.lang.reflect.Method.invokeNative(Native Method)
03-27 00:23:59.643: E/AndroidRuntime(1589): at java.lang.reflect.Method.invoke(Method.java:511)
03-27 00:23:59.643: E/AndroidRuntime(1589): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
03-27 00:23:59.643: E/AndroidRuntime(1589): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
03-27 00:23:59.643: E/AndroidRuntime(1589): at dalvik.system.NativeStart.main(Native Method)
03-27 00:23:59.643: E/AndroidRuntime(1589): Caused by: java.lang.IllegalArgumentException: selectionArgs must be provided for the Uri: content://com.ec.idiomas.searchabledict.DictionaryProvider/dictionary
03-27 00:23:59.643: E/AndroidRuntime(1589): at com.ec.idiomas.DictionaryProvider.query(DictionaryProvider.java:62)
03-27 00:23:59.643: E/AndroidRuntime(1589): at android.content.ContentProvider.query(ContentProvider.java:652)
03-27 00:23:59.643: E/AndroidRuntime(1589): at android.content.ContentProvider$Transport.query(ContentProvider.java:189)
03-27 00:23:59.643: E/AndroidRuntime(1589): at android.content.ContentResolver.query(ContentResolver.java:370)
03-27 00:23:59.643: E/AndroidRuntime(1589): at android.content.ContentResolver.query(ContentResolver.java:313)
03-27 00:23:59.643: E/AndroidRuntime(1589): at com.ec.idiomas.BancoDictionary.onCreate(BancoDictionary.java:107)
03-27 00:23:59.643: E/AndroidRuntime(1589): at android.app.Activity.performCreate(Activity.java:5008)
03-27 00:23:59.643: E/AndroidRuntime(1589): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1079)
03-27 00:23:59.643: E/AndroidRuntime(1589): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2023)
03-27 00:23:59.643: E/AndroidRuntime(1589): ... 11 more
我的主要活动
public class BancoDictionary extends ListActivity {
public static final String PREFS_NAME = "MyPrefsFile1";
ListView mListView;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mListView = (ListView) findViewById(R.id.list);
Cursor cursor = getContentResolver().query(DictionaryProvider.CONTENT_URI, new String[] {DictionaryDatabase.KEY_WORD, DictionaryDatabase.KEY_DEFINITION}, null, null, null);
startManagingCursor(cursor);
String[] columns = new String[] { DictionaryDatabase.KEY_WORD, DictionaryDatabase.KEY_DEFINITION };
int[] to = new int[] { R.id.word, R.id.definition };
SimpleCursorAdapter mAdapter = new SimpleCursorAdapter(this, R.layout.list_item, cursor, columns, to);
mListView.setListAdapter(mAdapter);
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);
wordIntent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
wordIntent.addFlags(Intent.FLAG_ACTIVITY_NO_ANIMATION);
startActivity(wordIntent);
}
});
}
}
DictionaryProvider
DictionaryProvider
public class DictionaryProvider extends ContentProvider {
String TAG = "DictionaryProvider";
public static String AUTHORITY = "com.ec.idiomas.searchabledict.DictionaryProvider";
public static final Uri CONTENT_URI = Uri.parse("content://" + AUTHORITY + "/dictionary");
public static final String WORDS_MIME_TYPE = ContentResolver.CURSOR_DIR_BASE_TYPE +
"/vnd.ec.idiomas.searchabledict";
public static final String DEFINITION_MIME_TYPE = ContentResolver.CURSOR_ITEM_BASE_TYPE +
"/vnd.eci.idiomas.searchabledict";
private DictionaryDatabase mDictionary;
private static final int SEARCH_WORDS = 0;
private static final int GET_WORD = 1;
private static final int SEARCH_SUGGEST = 2;
private static final int REFRESH_SHORTCUT = 3;
private static final UriMatcher sURIMatcher = buildUriMatcher();
private static UriMatcher buildUriMatcher() {
UriMatcher matcher = new UriMatcher(UriMatcher.NO_MATCH);
matcher.addURI(AUTHORITY, "dictionary", SEARCH_WORDS);
matcher.addURI(AUTHORITY, "dictionary/#", GET_WORD);
matcher.addURI(AUTHORITY, SearchManager.SUGGEST_URI_PATH_QUERY, SEARCH_SUGGEST);
matcher.addURI(AUTHORITY, SearchManager.SUGGEST_URI_PATH_QUERY + "/*", SEARCH_SUGGEST);
matcher.addURI(AUTHORITY, SearchManager.SUGGEST_URI_PATH_SHORTCUT, REFRESH_SHORTCUT);
matcher.addURI(AUTHORITY, SearchManager.SUGGEST_URI_PATH_SHORTCUT + "/*", REFRESH_SHORTCUT);
return matcher;
}
@Override
public boolean onCreate() {
mDictionary = new DictionaryDatabase(getContext());
return true;
}
@Override
public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs,
String sortOrder) {
switch (sURIMatcher.match(uri)) {
case SEARCH_SUGGEST:
if (selectionArgs == null) {
throw new IllegalArgumentException(
"selectionArgs must be provided for the Uri: " + uri);
}
return getSuggestions(selectionArgs[0]);
case SEARCH_WORDS:
if (selectionArgs == null) {
throw new IllegalArgumentException(
"selectionArgs must be provided for the Uri: " + uri);
}
return search(selectionArgs[0]);
case GET_WORD:
return getWord(uri);
case REFRESH_SHORTCUT:
return refreshShortcut(uri);
default:
throw new IllegalArgumentException("Unknown Uri: " + uri);
}
}
private Cursor getSuggestions(String query) {
query = query.toLowerCase();
String[] columns = new String[] {
BaseColumns._ID,
DictionaryDatabase.KEY_WORD,
SearchManager.SUGGEST_COLUMN_INTENT_DATA_ID};
return mDictionary.getWordMatches(query, columns);
}
private Cursor search(String query) {
query = query.toLowerCase();
String[] columns = new String[] {
BaseColumns._ID,
DictionaryDatabase.KEY_WORD,
DictionaryDatabase.KEY_DEFINITION};
return mDictionary.getWordMatches(query, columns);
}
private Cursor getWord(Uri uri) {
String rowId = uri.getLastPathSegment();
String[] columns = new String[] {
DictionaryDatabase.KEY_WORD,
DictionaryDatabase.KEY_DEFINITION};
return mDictionary.getWord(rowId, columns);
}
private Cursor refreshShortcut(Uri uri) {
String rowId = uri.getLastPathSegment();
String[] columns = new String[] {
BaseColumns._ID,
DictionaryDatabase.KEY_WORD,
DictionaryDatabase.KEY_DEFINITION,
SearchManager.SUGGEST_COLUMN_SHORTCUT_ID,
SearchManager.SUGGEST_COLUMN_INTENT_DATA_ID};
return mDictionary.getWord(rowId, columns);
}
@Override
public String getType(Uri uri) {
switch (sURIMatcher.match(uri)) {
case SEARCH_WORDS:
return WORDS_MIME_TYPE;
case GET_WORD:
return DEFINITION_MIME_TYPE;
case SEARCH_SUGGEST:
return SearchManager.SUGGEST_MIME_TYPE;
case REFRESH_SHORTCUT:
return SearchManager.SHORTCUT_MIME_TYPE;
default:
throw new IllegalArgumentException("Unknown URL " + uri);
}
}
@Override
public Uri insert(Uri uri, ContentValues values) {
throw new UnsupportedOperationException();
}
@Override
public int delete(Uri uri, String selection, String[] selectionArgs) {
throw new UnsupportedOperationException();
}
@Override
public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs) {
throw new UnsupportedOperationException();
}
}
推荐答案
日志说它：无法启动活动ComponentInfo {com.ec.idiomas / com.ec.idiomas.BancoDictionary}了java.lang.RuntimeException：您的内容必须有一个ListView的id属性是'android.R.id.list
The log says it: Unable to start activity ComponentInfo{com.ec.idiomas/com.ec.idiomas.BancoDictionary}: java.lang.RuntimeException: Your content must have a ListView whose id attribute is 'android.R.id.list'
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