我有sqlite数据库我成功从中获取了所有数据并将其存储在String数据中，然后使用另一个只有Toast的java类显示它。
现在我正在尝试将此数据发送到另一个活动。
这是我通过点击具有此方法的按钮从数据库收到的数据
public void viewDetails(View view){
String data= mDbHelper.getALLData();
Message.message(this,data);
}
我使用另一个Toast中的class显示数据称为消息，而viewDetails方法从<{p}中获取数据
getALLData
NotesDbAdapter.java:我试图使用意图，但它没有用
这是NotesDbAdapter.java：
public String getALLData(){
mDb = mDbHelper.getWritableDatabase();
String[] columns={KEY_ROWID ,KEY_TITLE,KEY_BODY};
Cursor cursor = mDb.query(DATABASE_TABLE, columns, null, null, null, null, null);
StringBuffer buffer=new StringBuffer();
while (cursor.moveToNext()){
int cid=cursor.getInt(0);
String title=cursor.getString(1);
String body=cursor.getString(2);
buffer.append(cid+" "+title+" "+body+"\n");
}
return buffer.toString();
这是我存储数据的NoteEdit活动，此活动还有一个按钮，用于获取数据并将其显示为
public class NotesDbAdapter {
public static final String KEY_TITLE = "title";
public static final String KEY_DATE = "date";
public static final String KEY_BODY = "body";
public static final String KEY_ROWID = "_id";
private static final String TAG = "NotesDbAdapter";
private DatabaseHelper mDbHelper;
private SQLiteDatabase mDb;
/**
* Database creation sql statement
*/
private static final String DATABASE_CREATE =
"create table notes (_id integer primary key autoincrement, "
+ "title text not null, body text not null, date text not null);";
private static final String DATABASE_NAME = "data";
private static final String DATABASE_TABLE = "notes";
private static final int DATABASE_VERSION = 2;
private final Context mCtx;
private static class DatabaseHelper extends SQLiteOpenHelper {
DatabaseHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL(DATABASE_CREATE);
}
@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 notes");
onCreate(db);
}
}
/**
* Constructor - takes the context to allow the database to be
* opened/created
*
* @param ctx the Context within which to work
*/
public NotesDbAdapter(Context ctx) {
this.mCtx = ctx;
}
/**
* Open the notes database. If it cannot be opened, try to create a new
* instance of the database. If it cannot be created, throw an exception to
* signal the failure
*
* @return this (self reference, allowing this to be chained in an
* initialization call)
* @throws SQLException if the database could be neither opened or created
*/
public NotesDbAdapter open() throws SQLException {
mDbHelper = new DatabaseHelper(mCtx);
mDb = mDbHelper.getWritableDatabase();
return this;
}
public void close() {
mDbHelper.close();
}
/**
* Create a new note using the title and body provided. If the note is
* successfully created return the new rowId for that note, otherwise return
* a -1 to indicate failure.
*
* @param title the title of the note
* @param body the body of the note
* @return rowId or -1 if failed
*/
public long createNote(String title, String body, String date) {
ContentValues initialValues = new ContentValues();
initialValues.put(KEY_TITLE, title);
initialValues.put(KEY_BODY, body);
initialValues.put(KEY_DATE, date);
return mDb.insert(DATABASE_TABLE, null, initialValues);
}
/**
* Delete the note with the given rowId
*
* @param rowId id of note to delete
* @return true if deleted, false otherwise
*/
public boolean deleteNote(long rowId) {
return mDb.delete(DATABASE_TABLE, KEY_ROWID + "=" + rowId, null) > 0;
}
/**
* Return a Cursor over the list of all notes in the database
*
* @return Cursor over all notes
*/
public Cursor fetchAllNotes() {
return mDb.query(DATABASE_TABLE, new String[] {KEY_ROWID, KEY_TITLE,
KEY_BODY,KEY_DATE}, null, null, null, null, null);
}
/**
* Return a Cursor positioned at the note that matches the given rowId
*
* @param rowId id of note to retrieve
* @return Cursor positioned to matching note, if found
* @throws SQLException if note could not be found/retrieved
*/
public Cursor fetchNote(long rowId) throws SQLException {
Cursor mCursor =
mDb.query(true, DATABASE_TABLE, new String[] {KEY_ROWID,
KEY_TITLE, KEY_BODY,KEY_DATE}, KEY_ROWID + "=" + rowId, null,
null, null, null, null);
if (mCursor != null) {
mCursor.moveToFirst();
}
return mCursor;
}
/**
* Update the note using the details provided. The note to be updated is
* specified using the rowId, and it is altered to use the title and body
* values passed in
*
* @param rowId id of note to update
* @param title value to set note title to
* @param body value to set note body to
* @return true if the note was successfully updated, false otherwise
*/
public boolean updateNote(long rowId, String title, String body,String date) {
ContentValues args = new ContentValues();
args.put(KEY_TITLE, title);
args.put(KEY_BODY, body);
//This lines is added for personal reason
args.put(KEY_DATE, date);
//One more parameter is added for data
return mDb.update(DATABASE_TABLE, args, KEY_ROWID + "=" + rowId, null) > 0;
}
public String getALLData(){
mDb = mDbHelper.getWritableDatabase();
String[] columns={KEY_ROWID ,KEY_TITLE,KEY_BODY};
Cursor cursor = mDb.query(DATABASE_TABLE, columns, null, null, null, null, null);
StringBuffer buffer=new StringBuffer();
while (cursor.moveToNext()){
int cid=cursor.getInt(0);
String title=cursor.getString(1);
String body=cursor.getString(2);
buffer.append(cid+" "+title+" "+body+"\n");
}
return buffer.toString();
}}
这是有Toast的消息
The NoteEdit activity where I store data:
我想要做的是在viewDetails方法中收集这些数据后将其发送到另一个活动中，然后将其转换为另一个活动，这样我就可以执行其他操作，而不是只用Toast显示它
我希望你现在明白我的报价
答案 0 :(得分：1)
只需使用Intent传递data即可，DestinationActivity
void viewDetails(View view){
String data = mDbHelper.getALLData();
Intent intent = new Intent(this, DestinationActivity.class);
intent.putExtra(Intent.EXTRA_TEXT, data);
startActivity(intent);
}
现在，在DestinationActivity中，将data检索为
String data = getIntent().getStringExtra(Intent.EXTRA_TEXT);
答案 1 :(得分：0)
public class Message {
public static void message(Context context,String message){
Toast.makeText(context, message, Toast.LENGTH_LONG).show();
}
}
public class Message {
public static void message(Context context,String message){
Toast.makeText(context, message, Toast.LENGTH_LONG).show();
}
}