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我有一個數據庫，我可以創建和刪除新記錄。我希望將這些記錄顯示在另一個活動的列表視圖中。從sqlite數據庫創建列表視圖
數據庫：
public class DBHelper extends SQLiteOpenHelper {
// Database Version
private static final int DATABASE_VERSION = 1;
// Database Name
private static final String DATABASE_NAME = "spinnerExample";
// Labels table name
private static final String TABLE_LABELS = "labels";
// Labels Table Columns names
private static final String KEY_ID = "id";
private static final String KEY_NAME = "name";
public DBHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
// Creating Tables
@Override
public void onCreate(SQLiteDatabase db) {
// Category table create query
String CREATE_CATEGORIES_TABLE = "CREATE TABLE " + TABLE_LABELS + "("
+ KEY_ID + " INTEGER PRIMARY KEY," + KEY_NAME + " TEXT)";
db.execSQL(CREATE_CATEGORIES_TABLE);
}
// Upgrading database
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// Drop older table if existed
db.execSQL("DROP TABLE IF EXISTS " + TABLE_LABELS);
// Create tables again
onCreate(db);
}
/**
* Inserting new lable into lables table
* */
public void insertLabel(String label){
SQLiteDatabase db = this.getWritableDatabase();
ContentValues values = new ContentValues();
values.put(KEY_NAME, label);
// Inserting Row
db.insert(TABLE_LABELS, null, values);
db.close(); // Closing database connection
}
/**
* Removing label
* */
public void removeLabel(String label){
SQLiteDatabase db = this.getWritableDatabase();
ContentValues values = new ContentValues();
values.put(KEY_NAME, label);
// Removing Row
db.delete(TABLE_LABELS, KEY_NAME + "=?", new String[] {label});
db.close(); // Closing database connection
}
/**
* Getting all labels
* returns list of labels
* */
public List<String> getAllLabels(){
List<String> labels = new ArrayList<String>();
// Select All Query
String selectQuery = "SELECT * FROM " + TABLE_LABELS;
SQLiteDatabase db = this.getReadableDatabase();
Cursor cursor = db.rawQuery(selectQuery, null);
// looping through all rows and adding to list
if (cursor.moveToFirst()) {
do {
labels.add(cursor.getString(1));
} while (cursor.moveToNext());
}
// closing connection
cursor.close();
db.close();
// returning lables
return labels;
}
}
列表視圖的佈局：
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Modules"
android:layout_margin="10dp"
android:textStyle="bold"
android:textSize="30dp"
android:layout_gravity="center"/>
<ListView
android:id="@+id/lst_module"
android:layout_width="match_parent"
android:layout_height="330dp"
android:layout_marginRight="7dp"
android:layout_marginLeft="7dp"
android:layout_marginTop="7dp" >
</ListView>
<Button
android:id="@+id/btn_edtmodule"
android:layout_width="fill_parent"
android:layout_height="64dp"
android:text="Edit Modules"
android:textStyle="bold"
android:layout_marginLeft="10dp"
android:layout_marginRight="10dp"/>
</LinearLayout>
Activity類：
public class Module extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.module);
Button editModule = (Button) findViewById(R.id.btn_edtmodule);
editModule.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
startActivity(new Intent("sg.edu.tp.iit.mns.VotingAppMain"));
}
});
}
竟被我d想知道活動課的代碼是什麼。有人可以幫我解決問題。即時通訊這個Android世界非常新。