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我一直试图在Android上创建一个简单的数据库，其中有一个表获取三个值，一个用于id，一个用于事件desc。另一个是字符串格式的时间。问题是，它无故崩溃，我找不到原因。这里是MainActivity：试图使用SQLite第一次使Android数据库，我的应用程序不断崩溃
public class MainActivity extends ListActivity {
private static final int MENU_EDIT = Menu.FIRST+1;
private static final int MENU_REMOVE = Menu.FIRST+2;
ArrayList <String> Events = new ArrayList<String>();
ArrayList <Integer> ids = new ArrayList<Integer>();
ListView lview = (ListView)findViewById(R.id.listview);
DBHandler db;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// registerForContextMenu(getListView());
db = new DBHandler(this);
// db.addInfo(new Day_Info("stef", "123"));
loadList();
}
private void loadList() {
try{
Events.clear();
ids.clear();
for(Day_Info e:db.getAllInfo()){
Events.add(e.getEvents()+", "+e.getTime());
ids.add(e.getId());
}
ArrayAdapter<String> adapter=new ArrayAdapter<String>(this,
android.R.layout.simple_list_item_2,Events);
lview.setAdapter(adapter);
}
catch(Exception e){
Toast.makeText(this, "Problem Loading List", Toast.LENGTH_LONG).show();
}
}
，这里是我的数据库类：
class DBHandler extends SQLiteOpenHelper {
private static final String TABLE_NAME = "INFO";
private static final String DATABASE_NAME = "Schedule";
private static final String EVENT_DB ="event";
private static final String TIME_DB = "time";
public DBHandler(Context context) {
super(context, DATABASE_NAME, null, 1);
//Log.d("Database", "Database created");
}
@Override
public void onCreate(SQLiteDatabase db) {
String TABLE_CREATION = "CREATE TABLE "+ TABLE_NAME +" (_id INTEGER PRIMARY KEY AUTOINCREMENT, EVENT TEXT not null,TIME TEXT not null)";
db.execSQL(TABLE_CREATION);
Log.d("Database", "Tables created");
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion,
int newVersion) {
}
void addInfo(Day_Info info){
SQLiteDatabase db = this.getWritableDatabase();
ContentValues cv = new ContentValues();
cv.put(EVENT_DB, info.getEvents());
cv.put(TIME_DB, info.getTime());
db.insert(TABLE_NAME, null, cv);
db.close();
}
public ArrayList<Day_Info> getAllInfo(){
ArrayList<Day_Info> List = new ArrayList<Day_Info>();
String selectQuery = "SELECT * FROM "+TABLE_NAME;
SQLiteDatabase db = this.getReadableDatabase();
Cursor cursor = db.rawQuery(selectQuery, null);
if(cursor.moveToFirst()){
do{
Day_Info info= new Day_Info();
info.setId(Integer.parseInt(cursor.getString(0)));
info.setEvents(cursor.getString(1));
info.setTime(cursor.getString(2));
List.add(info);
}while(cursor.moveToNext());
cursor.close();
}
return List;
}
}
发表的logcat你的错误，它会帮助我们检测到你的问题:) – zozelfelfo
把你的logcat和它抛出的错误 –
没有logcat的崩溃。 '不可能！' –