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即使有這個應用程序沒有錯誤，但每個Vactivity被調用時崩潰。 LogCat顯示該表Analysis_for_Today沒有名爲Activated的列。請幫助我找到我在這裏做錯了什麼。有沒有列錯誤：SQLite的Android的
MainActivity類別（推出第一）：
public class MainActivity extends Activity{
long currentTimeMillis;
long endTimeMillis;
public int count = 0;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
currentTimeMillis = System.currentTimeMillis();
final MediaPlayer mp = MediaPlayer.create(this, R.drawable.beep);
Button b = (Button) findViewById(R.id.button1);
b.setOnClickListener(new View.OnClickListener(){
public void onClick(View v) {
mp.start();
if(mp.isPlaying())
count++;
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
@Override
protected void onStop() {
// TODO Auto-generated method stub
super.onStop();
endTimeMillis = System.currentTimeMillis();
SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(this);
SharedPreferences.Editor editor = preferences.edit();
editor.putString("on",String.valueOf(currentTimeMillis));
editor.putString("off",String.valueOf(endTimeMillis));
editor.putInt("count", count);
editor.commit();
Intent intent =new Intent(MainActivity.this, Vactivity.class);
startActivity(intent);
}
}
Vactivity類（啓動時MainActivity退出）：
public class Vactivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(this);
String onValue = preferences.getString("on", "");
String offValue = preferences.getString("off", "");
int no = preferences.getInt("count", 0);
DataBaseHandler db = new DataBaseHandler(this);
db.addDetails(new PassValues(onValue, offValue, no));
setContentView(R.layout.activity_v);
}
}
PassValues類：
}
數據庫處理器類（處理DB）：
public class DataBaseHandler extends SQLiteOpenHelper {
private static final int DATABASE_VERSION = 1;
private static final String DATABASE_NAME = "Analysis_DB";
private static final String TABLE_TODAY = "Analysis_for_Today";
private static final String ID = "_ID";
private static final String ON = "Activated";
private static final String OFF = "Terminated";
private static final String COUNT = "Times_Dozed";
public DataBaseHandler(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db) {
String CREATE_CONTACTS_TABLE = "CREATE TABLE " + TABLE_TODAY + "("
+ ID + " INTEGER PRIMARY KEY," + ON + " TEXT,"
+ OFF + " TEXT," + COUNT + " INTEGER," +")";
db.execSQL(CREATE_CONTACTS_TABLE);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// Drop older table if existed
db.execSQL("DROP TABLE IF EXISTS " + TABLE_TODAY);
// Create tables again
onCreate(db);
}
public void addDetails(PassValues p)
{
SQLiteDatabase db = this.getWritableDatabase();
ContentValues values = new ContentValues();
values.put(ID, 1);
values.put(ON, p.get_onValue());
values.put(OFF, p.get_offValue());
values.put(COUNT, p.get_count());
// Inserting Row
db.insert(TABLE_TODAY, null, values);
db.close(); // Closing database connection
}
}
部分的logcat的：
04-12 07:54:46.197: E/SQLiteLog(2604): (1) table Analysis_for_Today has no column named Activated
04-12 07:54:46.287: E/SQLiteDatabase(2604): Error inserting Activated=1397303677511 Terminated=1397303685201 Times_Dozed=1 _ID=1
04-12 07:54:46.287: E/SQLiteDatabase(2604): android.database.sqlite.SQLiteException: table Analysis_for_Today has no column named Activated (code 1): , while compiling: INSERT INTO Analysis_for_Today(Activated,Terminated,Times_Dozed,_ID) VALUES (?,?,?,?)
嘗試按我的解決方案，給我這個反饋。 –