我想从Activity B获取一些数据，然后将它们放到DataBase中，然后保存它们。然后用Activity A中的这些数据创建listView，但是我有错误。
public class MainActivity extends ActionBarActivity implements View.OnClickListener {
Button btnadd;
LinearLayout llMain;
Time today = new Time(Time.getCurrentTimezone());
DBAdapter myDb;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ActionBar actionBar = getSupportActionBar();
actionBar.hide();
btnadd = (Button) findViewById(R.id.button);
//llMain = (LinearLayout) findViewById(R.id.llMain);
btnadd.setOnClickListener(this);
openDB();
populateListView();
}
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.button:
Intent intent = new Intent(this, result.class);
startActivityForResult(intent, 1);
break;
}
}
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
String name = data.getStringExtra("name");
String group = data.getStringExtra("group");
today.setToNow();
String timestamp = today.format("%Y-%m-%d %H:%M:%S");
myDb.insertRow(name,timestamp,group);
populateListView();
}
private void openDB(){
myDb = new DBAdapter(this);
myDb.open();
}
private void populateListView(){
Cursor cursor = myDb.getAllRows();
String[] fromFieldNames = new String[]{DBAdapter.KEY_ROWID,DBAdapter.KEY_TASK};
int[] toViewIDs = new int[]{R.id.textView3,R.id.textView6};
SimpleCursorAdapter myCursorAdapter;
myCursorAdapter = new SimpleCursorAdapter(getBaseContext(),R.layout.item_layout,cursor,fromFieldNames,toViewIDs,0);
ListView myList = (ListView) findViewById(R.id.listView);
myList.setAdapter(myCursorAdapter);
}
}
ResultActivity：
public class result extends ActionBarActivity implements View.OnClickListener {
EditText etName;
Button btnOk;
EditText etData;
boolean bIcon = true;
ImageButton star;
String group;
Intent intent = new Intent();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_result);
ActionBar actionBar = getSupportActionBar();
actionBar.hide();
etName = (EditText) findViewById(R.id.editText);
btnOk = (Button) findViewById(R.id.button2);
star = (ImageButton) findViewById(R.id.imageButton);
btnOk.setOnClickListener(this);
star.setOnClickListener(this);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_result, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.button2:
intent.putExtra("task", etName.getText().toString());
setResult(RESULT_OK, intent);
finish();
break;
case R.id.imageButton:
if (bIcon) {
star.setImageResource(R.drawable.star1);
group = "top";
}
else
star.setImageResource(R.drawable.star);
group = null;
intent.putExtra("group",group);
bIcon = !bIcon;
break;
}
}
将对DBAdapter：
public class DBAdapter {
private static final String TAG = "DBAdapter"; //used for logging database version changes
// Field Names:
public static final String KEY_ROWID = "_id";
public static final String KEY_TASK = "task";
public static final String KEY_DATE = "date";
public static final String KEY_GROUP = "group";
public static final String[] ALL_KEYS = new String[] {KEY_ROWID, KEY_TASK, KEY_DATE,KEY_GROUP};
// Column Numbers for each Field Name:
public static final int COL_ROWID = 0;
public static final int COL_TASK = 1;
public static final int COL_DATE = 2;
public static final int COL_GROUP = 3;
// DataBase info:
public static final String DATABASE_NAME = "dbToDo";
public static final String DATABASE_TABLE = "mainToDo";
public static final int DATABASE_VERSION = 2; // The version number must be incremented each time a change to DB structure occurs.
//SQL statement to create database
private static final String DATABASE_CREATE_SQL =
"CREATE TABLE " + DATABASE_TABLE
+ " (" + KEY_ROWID + " INTEGER PRIMARY KEY AUTOINCREMENT, "
+ KEY_TASK + " TEXT NOT NULL, " +KEY_GROUP + " TEXT, "
+ KEY_DATE + " TEXT"
+ ");";
private final Context context;
private DatabaseHelper myDBHelper;
private SQLiteDatabase db;
public DBAdapter(Context ctx) {
this.context = ctx;
myDBHelper = new DatabaseHelper(context);
}
// Open the database connection.
public DBAdapter open() {
db = myDBHelper.getWritableDatabase();
return this;
}
// Close the database connection.
public void close() {
myDBHelper.close();
}
// Add a new set of values to be inserted into the database.
public long insertRow(String task, String date,String group) {
ContentValues initialValues = new ContentValues();
initialValues.put(KEY_TASK, task);
initialValues.put(KEY_DATE, date);
initialValues.put(KEY_GROUP, group);
// Insert the data into the database.
return db.insert(DATABASE_TABLE, null, initialValues);
}
// Delete a row from the database, by rowId (primary key)
public boolean deleteRow(long rowId) {
String where = KEY_ROWID + "=" + rowId;
return db.delete(DATABASE_TABLE, where, null) != 0;
}
public void deleteAll() {
Cursor c = getAllRows();
long rowId = c.getColumnIndexOrThrow(KEY_ROWID);
if (c.moveToFirst()) {
do {
deleteRow(c.getLong((int) rowId));
} while (c.moveToNext());
}
c.close();
}
// Return all data in the database.
public Cursor getAllRows() {
String where = null;
Cursor c = db.query(true, DATABASE_TABLE, ALL_KEYS, where, null, null, null, null, null);
if (c != null) {
c.moveToFirst();
}
return c;
}
// Get a specific row (by rowId)
public Cursor getRow(long rowId) {
String where = KEY_ROWID + "=" + rowId;
Cursor c = db.query(true, DATABASE_TABLE, ALL_KEYS,
where, null, null, null, null, null);
if (c != null) {
c.moveToFirst();
}
return c;
}
// Change an existing row to be equal to new data.
public boolean updateRow(long rowId, String task, String date,String group) {
String where = KEY_ROWID + "=" + rowId;
ContentValues newValues = new ContentValues();
newValues.put(KEY_TASK, task);
newValues.put(KEY_DATE, date);
newValues.put(KEY_GROUP, group);
// Insert it into the database.
return db.update(DATABASE_TABLE, newValues, where, null) != 0;
}
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_SQL);
}
@Override
public void onUpgrade(SQLiteDatabase _db, int oldVersion, int newVersion) {
Log.w(TAG, "Upgrading application's database from version " + oldVersion
+ " to " + newVersion + ", which will destroy all old data!");
// Destroy old database:
_db.execSQL("DROP TABLE IF EXISTS " + DATABASE_TABLE);
// Recreate new database:
onCreate(_db);
}
}
}
ERROR：
06-15 15:02:34.759 223-265/? E/ThermalDaemon﹕ CPU1 Max freq recover to 1188000
06-15 15:02:35.710 223-265/? E/ThermalDaemon﹕ CPU1 Max freq recover to 1188000
06-15 15:02:36.080 631-660/? E/power﹕ Can not write CPU_PERF_LEVEL_LOCK. (Invalid argument)
06-15 15:02:36.180 23620-23620/? E/Trace﹕ error opening trace file: No such file or directory (2)
06-15 15:02:36.190 631-1443/? E/Surface﹕ Invalid SurfaceControl
06-15 15:02:36.321 23620-23620/com.example.user.campus E/SQLiteLog﹕ (1) near "group": syntax error
06-15 15:02:36.331 631-659/? E/EmbeddedLogger﹕ App crashed! Process: com.example.user.campus
06-15 15:02:36.331 631-659/? E/EmbeddedLogger﹕ App crashed! Package: com.example.user.campus v1 (1.0)
06-15 15:02:36.331 631-659/? E/EmbeddedLogger﹕ Application Label: Campus
06-15 15:02:36.331 23620-23620/com.example.user.campus E/AndroidRuntime﹕ FATAL EXCEPTION: main
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.user.campus/com.example.user.campus.MainActivity}: android.database.sqlite.SQLiteException: near "group": syntax error (code 1): , while compiling: CREATE TABLE mainToDo (_id INTEGER PRIMARY KEY AUTOINCREMENT, task TEXT NOT NULL, group TEXT, date TEXT);
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2463)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2520)
at android.app.ActivityThread.access$600(ActivityThread.java:162)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1366)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:158)
at android.app.ActivityThread.main(ActivityThread.java:5751)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1083)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:850)
at dalvik.system.NativeStart.main(Native Method)
Caused by: android.database.sqlite.SQLiteException: near "group": syntax error (code 1): , while compiling: CREATE TABLE mainToDo (_id INTEGER PRIMARY KEY AUTOINCREMENT, task TEXT NOT NULL, group TEXT, date TEXT);
at android.database.sqlite.SQLiteConnection.nativePrepareStatement(Native Method)
at android.database.sqlite.SQLiteConnection.acquirePreparedStatement(SQLiteConnection.java:909)
at android.database.sqlite.SQLiteConnection.prepare(SQLiteConnection.java:520)
at android.database.sqlite.SQLiteSession.prepare(SQLiteSession.java:588)
at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:58)
at android.database.sqlite.SQLiteStatement.<init>(SQLiteStatement.java:31)
at android.database.sqlite.SQLiteDatabase.executeSql(SQLiteDatabase.java:1719)
at android.database.sqlite.SQLiteDatabase.execSQL(SQLiteDatabase.java:1650)
at com.example.user.campus.DBAdapter$DatabaseHelper.onCreate(DBAdapter.java:131)
at android.database.sqlite.SQLiteOpenHelper.getDatabaseLocked(SQLiteOpenHelper.java:252)
at android.database.sqlite.SQLiteOpenHelper.getWritableDatabase(SQLiteOpenHelper.java:164)
at com.example.user.campus.DBAdapter.open(DBAdapter.java:53)
at com.example.user.campus.MainActivity.openDB(MainActivity.java:109)
at com.example.user.campus.MainActivity.onCreate(MainActivity.java:53)
at android.app.Activity.performCreate(Activity.java:5165)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1103)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2419)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2520)
at android.app.ActivityThread.access$600(ActivityThread.java:162)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1366)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:158)
at android.app.ActivityThread.main(ActivityThread.java:5751)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1083)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:850)
at dalvik.system.NativeStart.main(Native Method)
06-15 15:02:38.093 631-660/? E/power﹕ request perf lock level(0) is invalid. (Invalid argument)
06-15 15:02:39.774 223-265/? E/ThermalDaemon﹕ CPU1 Max freq recover to 1188000
06-15 15:03:00.116 223-265/? E/ThermalDaemon﹕ CPU1 Max freq recover to 1188000
06-15 15:03:04.511 223-265/? E/ThermalDaemon﹕ CPU1 Max freq recover to 1188000
06-15 15:03:04.751 223-271/? E/ThermalDaemon﹕ ril.data.radio_tech prop: change from 9 to 15
06-15 15:03:17.645 223-265/? E/ThermalDaemon﹕ CPU1 Max freq recover to 1188000
06-15 15:03:17.775 223-271/? E/ThermalDaemon﹕ ril.data.radio_tech prop: change from 15 to 3
06-15 15:03:18.776 223-271/? E/ThermalDaemon﹕ ril.data.radio_tech prop: change from 3 to 9
06-15 15:04:00.120 223-265/? E/ThermalDaemon﹕ CPU1 Max freq recover to 1188000
06-15 15:05:56.244 223-265/? E/ThermalDaemon﹕ CPU1 Max freq recover to 1188000
06-15 15:06:59.762 223-265/? E/ThermalDaemon﹕ CPU1 Max freq recover to 1188000
06-15 15:07:00.192 223-271/? E/ThermalDaemon﹕ ril.data.radio_tech prop: change from 9 to 15
06-15 15:07:03.326 223-265/? E/ThermalDaemon﹕ CPU1 Max freq recover to 1188000
06-15 15:07:08.701 223-265/? E/ThermalDaemon﹕ CPU1 Max freq recover to 1188000
06-15 15:07:09.212 223-271/? E/ThermalDaemon﹕ ril.data.radio_tech prop: change from 15 to 3
06-15 15:07:10.924 223-265/? E/ThermalDaemon﹕ CPU1 Max freq recover to 1188000
06-15 15:07:11.204 223-271/? E/ThermalDaemon﹕ ril.data.radio_tech prop: change from 3 to 102
06-15 15:08:03.760 223-265/? E/ThermalDaemon﹕ CPU1 Max freq recover to 1188000
06-15 15:08:06.052 223-265/? E/ThermalDaemon﹕ CPU1 Max freq recover to 1188000
06-15 15:08:06.303 223-271/? E/ThermalDaemon﹕ ril.data.radio_tech prop: change from 102 to 3
06-15 15:08:06.993 223-265/? E/ThermalDaemon﹕ CPU1 Max freq recover to 1188000
06-15 15:08:07.304 223-271/? E/ThermalDaemon﹕ ril.data.radio_tech prop: change from 3 to 15
06-15 15:08:13.260 223-265/? E/ThermalDaemon﹕ CPU1 Max freq recover to 1188000
06-15 15:08:13.320 223-271/? E/ThermalDaemon﹕ ril.data.radio_tech prop: change from 15 to 3
06-15 15:08:14.321 223-271/? E/ThermalDaemon﹕ ril.data.radio_tech prop: change from 3 to 9
06-15 15:08:49.539 223-265/? E/ThermalDaemon﹕ CPU1 Max freq recover to 1188000
06-15 15:08:50.390 223-271/? E/ThermalDaemon﹕ ril.data.radio_tech prop: change from 9 to 3
06-15 15:08:51.020 223-265/? E/ThermalDaemon﹕ CPU1 Max freq recover to 1188000
06-15 15:08:51.391 223-271/? E/ThermalDaemon﹕ ril.data.radio_tech prop: change from 3 to 15
06-15 15:08:54.224 223-265/? E/ThermalDaemon﹕ CPU1 Max freq recover to 1188000
06-15 15:08:54.394 223-271/? E/ThermalDaemon﹕ ril.data.radio_tech prop: change from 15 to 3
06-15 15:08:55.395 223-271/? E/ThermalDaemon﹕ ril.data.radio_tech prop: change from 3 to 9
06-15 15:08:58.468 223-265/? E/ThermalDaemon﹕ CPU1 Max freq recover to 1188000
06-15 15:09:00.390 223-265/? E/ThermalDaemon﹕ CPU1 Max freq recover to 1188000
06-15 15:09:00.400 223-271/? E/ThermalDaemon﹕ ril.data.radio_tech prop: change from 9 to 15
06-15 15:09:07.939 223-265/? E/ThermalDaemon﹕ CPU1 Max freq recover to 1188000
06-15 15:09:08.419 223-271/? E/ThermalDaemon﹕ ril.data.radio_tech prop: change from 15 to 9
06-15 15:10:00.104 223-265/? E/ThermalDaemon﹕ CPU1 Max freq recover to 1188000
06-15 15:10:56.364 223-265/? E/ThermalDaemon﹕ CPU1 Max freq recover to 1188000
06-15 15:11:21.771 223-265/? E/ThermalDaemon﹕ CPU1 Max freq recover to 1188000
06-15 15:11:21.972 24191-24191/? E/Trace﹕ error opening trace file: No such file or directory (2)
06-15 15:11:22.202 24217-24217/? E/Trace﹕ error opening trace file: No such file or directory (2)
06-15 15:11:23.043 223-265/? E/ThermalDaemon﹕ CPU1 Max freq recover to 1188000
06-15 15:11:23.673 223-271/? E/ThermalDaemon﹕ ril.data.radio_tech prop: change from 9 to 3
06-15 15:11:24.324 223-265/? E/ThermalDaemon﹕ CPU1 Max freq recover to 1188000
06-15 15:11:24.674 223-271/? E/ThermalDaemon﹕ ril.data.radio_tech prop: change from 3 to 15
06-15 15:11:27.317 223-265/? E/ThermalDaemon﹕ CPU1 Max freq recover to 1188000
06-15 15:11:33.063 223-265/? E/ThermalDaemon﹕ CPU1 Max freq recover to 1188000
06-15 15:11:33.564 223-265/? E/ThermalDaemon﹕ CPU1 Max freq recover to 1188000
06-15 15:11:33.694 223-271/? E/ThermalDaemon﹕ ril.data.radio_tech prop: change from 15 to 9
06-15 15:12:01.904 223-265/? E/ThermalDaemon﹕ CPU1 Max freq recover to 1188000
06-15 15:12:02.745 223-271/? E/ThermalDaemon﹕ ril.data.radio_tech prop: change from 9 to 15
06-15 15:12:09.412 223-265/? E/ThermalDaemon﹕ CPU1 Max freq recover to 1188000
06-15 15:12:09.763 223-271/? E/ThermalDaemon﹕ ril.data.radio_tech prop: change from 15 to 9
06-15 15:13:00.106 223-265/? E/ThermalDaemon﹕ CPU1 Max freq recover to 1188000
答案 0 :(得分：3)