Java 如何将字符串数据从sqlite发送到另一个活动
我有一个sqlite数据库，我成功地从中获取了所有数据，并将其存储在字符串数据中，然后使用另一个java类显示它，该类只有Toast 现在我正在尝试将此数据发送到另一个活动 我如何做到这一点 NotesDbAdapter.java：Java 如何将字符串数据从sqlite发送到另一个活动,java,android,Java,Android,我有一个sqlite数据库，我成功地从中获取了所有数据，并将其存储在字符串数据中，然后使用另一个java类显示它，该类只有Toast 现在我正在尝试将此数据发送到另一个活动 我如何做到这一点 NotesDbAdapter.java： public class NotesDbAdapter { public static final String KEY_TITLE = "title"; public static final String KEY_DATE = "date";
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();
}}
public class NoteEdit extends Activity {
public static int numTitle = 1;
public static String curDate = "";
public static String curText = "";
private EditText mTitleText;
private EditText mBodyText;
private TextView mDateText;
private Long mRowId;
private Cursor note;
private NotesDbAdapter mDbHelper;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mDbHelper = new NotesDbAdapter(this);
mDbHelper.open();
setContentView(R.layout.note_edit);
// getActionBar().setDisplayHomeAsUpEnabled(true);
setTitle(R.string.app_name);
mTitleText = (EditText) findViewById(R.id.title);
mBodyText = (EditText) findViewById(R.id.body);
mDateText = (TextView) findViewById(R.id.notelist_date);
long msTime = System.currentTimeMillis();
Date curDateTime = new Date(msTime);
SimpleDateFormat formatter = new SimpleDateFormat("d'/'M'/'y");
curDate = formatter.format(curDateTime);
mDateText.setText(""+curDate);
mRowId = (savedInstanceState == null) ? null :
(Long) savedInstanceState.getSerializable(NotesDbAdapter.KEY_ROWID);
if (mRowId == null) {
Bundle extras = getIntent().getExtras();
mRowId = extras != null ? extras.getLong(NotesDbAdapter.KEY_ROWID)
: null;
}
populateFields();
}
public static class LineEditText extends EditText{
// we need this constructor for LayoutInflater
public LineEditText(Context context, AttributeSet attrs) {
super(context, attrs);
mRect = new Rect();
mPaint = new Paint();
mPaint.setStyle(Paint.Style.FILL_AND_STROKE);
mPaint.setColor(Color.BLUE);
}
private Rect mRect;
private Paint mPaint;
@Override
protected void onDraw(Canvas canvas) {
int height = getHeight();
int line_height = getLineHeight();
int count = height / line_height;
if (getLineCount() > count)
count = getLineCount();
Rect r = mRect;
Paint paint = mPaint;
int baseline = getLineBounds(0, r);
for (int i = 0; i < count; i++) {
canvas.drawLine(r.left, baseline + 1, r.right, baseline + 1, paint);
baseline += getLineHeight();
super.onDraw(canvas);
}
}
}
@Override
protected void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
saveState();
outState.putSerializable(NotesDbAdapter.KEY_ROWID, mRowId);
}
@Override
protected void onPause() {
super.onPause();
saveState();
}
@Override
protected void onResume() {
super.onResume();
populateFields();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.noteedit_menu, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.menu_about:
/* Here is the introduce about myself */
AlertDialog.Builder dialog = new AlertDialog.Builder(NoteEdit.this);
dialog.setTitle("About");
dialog.setMessage("This project "
);
dialog.setPositiveButton("OK", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
}
});
dialog.show();
return true;
case R.id.menu_delete:
if(note != null){
note.close();
note = null;
}
if(mRowId != null){
mDbHelper.deleteNote(mRowId);
}
finish();
return true;
//speech button
case R.id.menu_speech:
//saveState();
//finish();
return true;
case R.id.menu_save:
saveState();
finish();
return true;
/* case android.R.id.home:
finish(); */
default:
return super.onOptionsItemSelected(item);
}
}
private void saveState() {
String title = mTitleText.getText().toString();
String body = mBodyText.getText().toString();
if(mRowId == null){
long id = mDbHelper.createNote(title, body, curDate);
if(id > 0){
mRowId = id;
}else{
Log.e("saveState","failed to create note");
}
}else{
if(!mDbHelper.updateNote(mRowId, title, body, curDate)){
Log.e("saveState","failed to update note");
}
}
}
private void populateFields() {
if (mRowId != null) {
note = mDbHelper.fetchNote(mRowId);
startManagingCursor(note);
mTitleText.setText(note.getString(
note.getColumnIndexOrThrow(NotesDbAdapter.KEY_TITLE)));
mBodyText.setText(note.getString(
note.getColumnIndexOrThrow(NotesDbAdapter.KEY_BODY)));
curText = note.getString(
note.getColumnIndexOrThrow(NotesDbAdapter.KEY_BODY));
}
}
public void viewDetails(View view){
String data= mDbHelper.getALLData();
Message.message(this,data);
}
}
public类notedit扩展活动{
公共静态int numTitle=1；
公共静态字符串curDate=“”；
公共静态字符串curText=“”；
私有编辑文本mTitleText；
私人编辑文本；
私有文本视图mDateText；
私人长mRowId；
私人光标注释；
私人票据登记簿；
@凌驾
创建时受保护的void（Bundle savedInstanceState）{
super.onCreate（savedInstanceState）；
mDbHelper=新的NotesDbAdapter（本）；
mDbHelper.open（）；
setContentView（R.layout.note\u编辑）；
//getActionBar（）.setDisplayHomeAsUpEnabled（true）；
setTitle（R.string.app_name）；
mTitleText=（EditText）findViewById（R.id.title）；
mBodyText=（EditText）findViewById（R.id.body）；
mDateText=（TextView）findViewById（R.id.notelist\u日期）；
long msTime=System.currentTimeMillis（）；
日期curDateTime=新日期（msTime）；
SimpleDataFormat格式化程序=新的SimpleDataFormat（“d'/'M'/'y”）；
curDate=formatter.format（curDateTime）；
mDateText.setText（“+curDate”）；
mRowId=（savedInstanceState==null）？null:
（Long）savedInstanceState.getSerializable（NotesDbAdapter.KEY_ROWID）；
if（mRowId==null）{
Bundle extras=getIntent（）.getExtras（）；
mRowId=extras！=null？extras.getLong（NotesDbAdapter.KEY\u ROWID）
：null；
}
populateFields（）；
}
公共静态类LineEditText扩展了EditText{
//我们需要这个构造器来实现LayoutFlater
公共LineEditText（上下文、属性集属性）{
超级（上下文，attrs）；
mRect=新的Rect（）；
mPaint=新油漆（）；
mPaint.setStyle（绘制、样式、填充和笔划）；
mPaint.setColor（Color.BLUE）；
}
私人直肠；
私人油漆；
@凌驾
受保护的void onDraw（画布）{
int height=getHeight（）；
int line_height=getLineHeight（）；
int count=高度/线条高度；
如果（getLineCount（）>count）
count=getLineCount（）；
Rect r=mRect；
油漆油漆=mPaint；
int基线=getLineBounds（0，r）；
for（int i=0；i0）{
mRowId=id；
}否则{
Log.e（“保存状态”，“无法创建注释”）；
}
}否则{
if（！mDbHelper.updateNote（mRowId、title、body、curDate））{
Log.e（“保存状态”，“无法更新注释”）
Intent intent=new Intent(getApplicationContext(), SecondActivity.class);
intent.putExtra("key1", "your value1 here");
intent.putExtra("key2", "your value2 here");
startActivity(intent);
String your_value1=getIntent().getStringExtra("key1");
String your_value2=getIntent().getStringExtra("key2");