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我正在開發一首歌書應用程序，我有以下文件：如何定位到下一個項目在SQLite數據庫表 - 安卓
- SbDatabase.java創建數據庫
- SbProvider.java創建供應商服務來訪問這首歌
- Searchable.java用於搜索歌曲
- Song.java用於顯示一首歌曲是從結果的列表視圖挑
我需要幫助來創建一個動作，讓用戶在觀看當前歌曲之前切換到另一首歌曲。這是我的代碼
1.SbDatabase.java
public class SbDatabase {
private static final String TAG = "SbDatabase";
public static final String KEY_WORD = SearchManager.SUGGEST_COLUMN_TEXT_1;
public static final String KEY_SONGCONT = SearchManager.SUGGEST_COLUMN_TEXT_2;
private static final String DATABASE_NAME = "songbook";
private static final String FTS_VIRTUAL_TABLE = "FTSsongbook";
private static final int DATABASE_VERSION = 2;
private final SongbookOpenHelper mDatabaseOpenHelper;
private static final HashMap<String,String> mColumnMap = buildColumnMap();
public SbDatabase(Context context) {
mDatabaseOpenHelper = new SongbookOpenHelper(context);
}
private static HashMap<String,String> buildColumnMap() {
HashMap<String,String> map = new HashMap<String,String>();
map.put(KEY_WORD, KEY_WORD);
map.put(KEY_SONGCONT, KEY_SONGCONT);
map.put(BaseColumns._ID, "rowid AS " +
BaseColumns._ID);
map.put(SearchManager.SUGGEST_COLUMN_INTENT_DATA_ID, "rowid AS " +
SearchManager.SUGGEST_COLUMN_INTENT_DATA_ID);
map.put(SearchManager.SUGGEST_COLUMN_SHORTCUT_ID, "rowid AS " +
SearchManager.SUGGEST_COLUMN_SHORTCUT_ID);
return map;
}
/**
* Returns a Cursor positioned at the song specified by rowId
*
* @param rowId id of song to retrieve
* @param columns The columns to include, if null then all are included
* @return Cursor positioned to matching song, or null if not found.
*/
public Cursor getSong(String rowId, String[] columns) {
String selection = "rowid = ?";
String[] selectionArgs = new String[] {rowId};
return query(selection, selectionArgs, columns);
/* This builds a query that looks like:
* SELECT <columns> FROM <table> WHERE rowid = <rowId>
*/
}
/**
* Returns a Cursor over all songs that match the given query
*
* @param query The string to search for
* @param columns The columns to include, if null then all are included
* @return Cursor over all songs that match, or null if none found.
*/
public Cursor getSongMatches(String query, String[] columns) {
String selection = KEY_WORD + " MATCH ?";
String[] selectionArgs = new String[] {query+"*"};
return query(selection, selectionArgs, columns);
/* This builds a query that looks like:
* SELECT <columns> FROM <table> WHERE <KEY_WORD> MATCH 'query*'
* which is an FTS3 search for the query text (plus a wildcard) inside the song column.
*
* - "rowid" is the unique id for all rows but we need this value for the "_id" column in
* order for the Adapters to work, so the columns need to make "_id" an alias for "rowid"
* - "rowid" also needs to be used by the SUGGEST_COLUMN_INTENT_DATA alias in order
* for suggestions to carry the proper intent data.
* These aliases are defined in the SbProvider when queries are made.
* - This can be revised to also search the songcont text with FTS3 by changing
* the selection clause to use FTS_VIRTUAL_TABLE instead of KEY_WORD (to search across
* the entire table, but sorting the relevance could be difficult.
*/
}
/**
* Performs a database query.
* @param selection The selection clause
* @param selectionArgs Selection arguments for "?" components in the selection
* @param columns The columns to return
* @return A Cursor over all rows matching the query
*/
private Cursor query(String selection, String[] selectionArgs, String[] columns) {
/* The SQLiteBuilder provides a map for all possible columns requested to
* actual columns in the database, creating a simple column alias mechanism
* by which the ContentProvider does not need to know the real column names
*/
SQLiteQueryBuilder builder = new SQLiteQueryBuilder();
builder.setTables(FTS_VIRTUAL_TABLE);
builder.setProjectionMap(mColumnMap);
Cursor cursor = builder.query(mDatabaseOpenHelper.getReadableDatabase(),
columns, selection, selectionArgs, null, null, null);
if (cursor == null) {
return null;
} else if (!cursor.moveToFirst()) {
cursor.close();
return null;
}
return cursor;
}
/**
* This creates/opens the database.
*/
private static class SongbookOpenHelper extends SQLiteOpenHelper {
private final Context mHelperContext;
private SQLiteDatabase mDatabase;
/* Note that FTS3 does not support column constraints and thus, you cannot
* declare a primary key. However, "rowid" is automatically used as a unique
* identifier, so when making requests, we will use "_id" as an alias for "rowid"
*/
private static final String FTS_TABLE_CREATE =
"CREATE VIRTUAL TABLE " + FTS_VIRTUAL_TABLE +
" USING fts3 (" +
KEY_WORD + ", " +
KEY_SONGCONT + ");";
SongbookOpenHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
mHelperContext = context;
}
@Override
public void onCreate(SQLiteDatabase db) {
mDatabase = db;
mDatabase.execSQL(FTS_TABLE_CREATE);
loadSongbook();
}
/**
* Starts a thread to load the database table with songs
*/
private void loadSongbook() {
new Thread(new Runnable() {
public void run() {
try {
loadSongs();
} catch (IOException e) {
throw new RuntimeException(e);
}
}
}).start();
}
private void loadSongs() throws IOException {
Log.d(TAG, "Loading songs...");
final Resources resources = mHelperContext.getResources();
InputStream inputStream = resources.openRawResource(R.raw.songbook);
BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));
try {
String line;
String thesong;
while ((line = reader.readLine()) != null) {
thesong = line.replace("$", System.getProperty("line.separator"));
String[] strings = TextUtils.split(thesong, "%");
if (strings.length < 2) continue;
long id = addSong(strings[0].trim(), strings[1].trim());
if (id < 0) {
Log.e(TAG, "unable to add song: " + strings[0].trim());
}
}
} finally {
reader.close();
}
Log.d(TAG, "DONE loading songs.");
}
public long addSong(String song, String songcont) {
ContentValues initialValues = new ContentValues();
initialValues.put(KEY_WORD, song);
initialValues.put(KEY_SONGCONT, songcont);
return mDatabase.insert(FTS_VIRTUAL_TABLE, null, initialValues);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
Log.w(TAG, "Upgrading database from version " + oldVersion + " to "
+ newVersion + ", which will destroy all old data");
db.execSQL("DROP TABLE IF EXISTS " + FTS_VIRTUAL_TABLE);
onCreate(db);
}
}
SbProvider.java
public SbDatabase(Context context) {
mDatabaseOpenHelper = new SongbookOpenHelper(context);
}
private static HashMap<String,String> buildColumnMap() {
HashMap<String,String> map = new HashMap<String,String>();
map.put(KEY_WORD, KEY_WORD);
map.put(KEY_SONGCONT, KEY_SONGCONT);
map.put(BaseColumns._ID, "rowid AS " +
BaseColumns._ID);
map.put(SearchManager.SUGGEST_COLUMN_INTENT_DATA_ID, "rowid AS " +
SearchManager.SUGGEST_COLUMN_INTENT_DATA_ID);
map.put(SearchManager.SUGGEST_COLUMN_SHORTCUT_ID, "rowid AS " +
SearchManager.SUGGEST_COLUMN_SHORTCUT_ID);
return map;
}
/**
* Returns a Cursor positioned at the song specified by rowId
*
* @param rowId id of song to retrieve
* @param columns The columns to include, if null then all are included
* @return Cursor positioned to matching song, or null if not found.
*/
public Cursor getSong(String rowId, String[] columns) {
String selection = "rowid = ?";
String[] selectionArgs = new String[] {rowId};
return query(selection, selectionArgs, columns);
/* This builds a query that looks like:
* SELECT <columns> FROM <table> WHERE rowid = <rowId>
*/
}
/**
* Returns a Cursor over all songs that match the given query
*
* @param query The string to search for
* @param columns The columns to include, if null then all are included
* @return Cursor over all songs that match, or null if none found.
*/
public Cursor getSongMatches(String query, String[] columns) {
String selection = KEY_WORD + " MATCH ?";
String[] selectionArgs = new String[] {query+"*"};
return query(selection, selectionArgs, columns);
/* This builds a query that looks like:
* SELECT <columns> FROM <table> WHERE <KEY_WORD> MATCH 'query*'
* which is an FTS3 search for the query text (plus a wildcard) inside the song column.
*
* - "rowid" is the unique id for all rows but we need this value for the "_id" column in
* order for the Adapters to work, so the columns need to make "_id" an alias for "rowid"
* - "rowid" also needs to be used by the SUGGEST_COLUMN_INTENT_DATA alias in order
* for suggestions to carry the proper intent data.
* These aliases are defined in the SbProvider when queries are made.
* - This can be revised to also search the songcont text with FTS3 by changing
* the selection clause to use FTS_VIRTUAL_TABLE instead of KEY_WORD (to search across
* the entire table, but sorting the relevance could be difficult.
*/
}
/**
* Performs a database query.
* @param selection The selection clause
* @param selectionArgs Selection arguments for "?" components in the selection
* @param columns The columns to return
* @return A Cursor over all rows matching the query
*/
private Cursor query(String selection, String[] selectionArgs, String[] columns) {
/* The SQLiteBuilder provides a map for all possible columns requested to
* actual columns in the database, creating a simple column alias mechanism
* by which the ContentProvider does not need to know the real column names
*/
SQLiteQueryBuilder builder = new SQLiteQueryBuilder();
builder.setTables(FTS_VIRTUAL_TABLE);
builder.setProjectionMap(mColumnMap);
Cursor cursor = builder.query(mDatabaseOpenHelper.getReadableDatabase(),
columns, selection, selectionArgs, null, null, null);
if (cursor == null) {
return null;
} else if (!cursor.moveToFirst()) {
cursor.close();
return null;
}
return cursor;
}
/**
* This creates/opens the database.
*/
private static class SongbookOpenHelper extends SQLiteOpenHelper {
private final Context mHelperContext;
private SQLiteDatabase mDatabase;
/* Note that FTS3 does not support column constraints and thus, you cannot
* declare a primary key. However, "rowid" is automatically used as a unique
* identifier, so when making requests, we will use "_id" as an alias for "rowid"
*/
private static final String FTS_TABLE_CREATE =
"CREATE VIRTUAL TABLE " + FTS_VIRTUAL_TABLE +
" USING fts3 (" +
KEY_WORD + ", " +
KEY_SONGCONT + ");";
SongbookOpenHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
mHelperContext = context;
}
@Override
public void onCreate(SQLiteDatabase db) {
mDatabase = db;
mDatabase.execSQL(FTS_TABLE_CREATE);
loadSongbook();
}
/**
* Starts a thread to load the database table with songs
*/
private void loadSongbook() {
new Thread(new Runnable() {
public void run() {
try {
loadSongs();
} catch (IOException e) {
throw new RuntimeException(e);
}
}
}).start();
}
private void loadSongs() throws IOException {
Log.d(TAG, "Loading songs...");
final Resources resources = mHelperContext.getResources();
InputStream inputStream = resources.openRawResource(R.raw.songbook);
BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));
try {
String line;
String thesong;
while ((line = reader.readLine()) != null) {
thesong = line.replace("$", System.getProperty("line.separator"));
String[] strings = TextUtils.split(thesong, "%");
if (strings.length < 2) continue;
long id = addSong(strings[0].trim(), strings[1].trim());
if (id < 0) {
Log.e(TAG, "unable to add song: " + strings[0].trim());
}
}
} finally {
reader.close();
}
Log.d(TAG, "DONE loading songs.");
}
public long addSong(String song, String songcont) {
ContentValues initialValues = new ContentValues();
initialValues.put(KEY_WORD, song);
initialValues.put(KEY_SONGCONT, songcont);
return mDatabase.insert(FTS_VIRTUAL_TABLE, null, initialValues);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
Log.w(TAG, "Upgrading database from version " + oldVersion + " to "
+ newVersion + ", which will destroy all old data");
db.execSQL("DROP TABLE IF EXISTS " + FTS_VIRTUAL_TABLE);
onCreate(db);
}
}
Searchable.java
公共類可搜索的擴展ActionBarActivity {
private TextView mTextView; private ListView mListView; LinearLayout MySong;
@SuppressWarnings("deprecation")
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.search);
mTextView = (TextView) findViewById(R.id.text);
mListView = (ListView) findViewById(R.id.list);
handleIntent(getIntent());
Cursor cursor = managedQuery(SbProvider.CONTENT_URI, null, null,
new String[] {"Lotv"}, null);
String[] from = new String[] { SbDatabase.KEY_WORD,
SbDatabase.KEY_SONGCONT };
int[] to = new int[] { R.id.song, R.id.songcont };
SimpleCursorAdapter songs = new SimpleCursorAdapter(this,
R.layout.result, cursor, from, to);
mListView.setAdapter(songs);
mListView.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Intent songIntent = new Intent(getApplicationContext(), Song.class);
Uri data = Uri.withAppendedPath(SbProvider.CONTENT_URI,
String.valueOf(id));
songIntent.setData(data);
startActivity(songIntent);
}
});
mTextView.setText("568 Songs of Worship!");
}
@Override
protected void onNewIntent(Intent intent) {
handleIntent(intent);
}
private void handleIntent(Intent intent) {
if (Intent.ACTION_VIEW.equals(intent.getAction())) {
Intent songIntent = new Intent(this, Song.class);
songIntent.setData(intent.getData());
startActivity(songIntent);
} else if (Intent.ACTION_SEARCH.equals(intent.getAction())) {
String query = intent.getStringExtra(SearchManager.QUERY);
showResults(query);
}
}
private void showResults(String query) {
Cursor cursor = managedQuery(SbProvider.CONTENT_URI, null, null,
new String[] {query}, null);
String[] from = new String[] { SbDatabase.KEY_WORD,
SbDatabase.KEY_SONGCONT };
int[] to = new int[] { R.id.song,
R.id.songcont };
SimpleCursorAdapter songs = new SimpleCursorAdapter(this,
R.layout.result, cursor, from, to);
mListView.setAdapter(songs);
mListView.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Intent songIntent = new Intent(getApplicationContext(), Song.class);
Uri data = Uri.withAppendedPath(SbProvider.CONTENT_URI,
String.valueOf(id));
songIntent.setData(data);
startActivity(songIntent);
}
});
if (cursor == null) {
mTextView.setText(getString(R.string.no_songs, new Object[] {query}));
} else {
int count = cursor.getCount();
String countString = getResources().getQuantityString(R.plurals.search_results,
count, new Object[] {count, query});
mTextView.setText(countString);
}
}
}
}
Song.java是我需要你幫忙解決一個按鈕，允許用戶去在接下來的ImageButton
公共類宋另一首歌延伸ActionBarActivity {
RelativeLayout MySong;
TextView songcont;
private ImageButton Previous;
private ImageButton Next;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.song);
Uri uri = getIntent().getData();
Cursor cursor = managedQuery(uri, null, null, null, null);
if (cursor == null) {
finish();
} else {
cursor.moveToFirst();
TextView songcont = (TextView) findViewById(R.id.songcont);
songcont.setMovementMethod(new ScrollingMovementMethod());
int wIndex = cursor.getColumnIndexOrThrow(SbDatabase.KEY_WORD);
int dIndex = cursor.getColumnIndexOrThrow(SbDatabase.KEY_SONGCONT);
setTitle(cursor.getString(wIndex));
songcont.setText(cursor.getString(dIndex));
Previous = (ImageButton)findViewById (R.id.imageButton1);
Next = (ImageButton)findViewById (R.id.imageButton2);
Next.setOnClickListener(new OnClickListener() {
public void onClick(View arg0) {
Intent songIntent = new Intent(getApplicationContext(), Song.class);
//Uri data = Uri.withAppendedPath(SbProvider.CONTENT_URI, String.valueOf(id));
Uri data = Uri.withAppendedPath(SbProvider.CONTENT_URI, String.valueOf(id));
songIntent.setData(data);
startActivity(songIntent);
}
});
} } }
感謝，但我無法實現一個循環，但檢查我工作 – 2015-02-24 11:13:04