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SQLiteデータベースからデータを取得し、リストビューで表示する方法。SQLiteデータベースからデータを読み込んでリストビューで表示する方法
私は私のコードでこれをやっているが、私はエラーを取得しています：
public class ShoewDataListActivity extends ListActivity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.grupadd);
Button btnAdd = (Button) findViewById(R.id.btnAdd);
Button view=(Button) findViewById(R.id.btnShowData);
view.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
displayResultList();
}
});
btnAdd.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
boolean didItWork = true;
try {
EditText edtAddName=(EditText) findViewById(R.id.editNameAdd);
String name = edtAddName.getText().toString();
AddData entry = new AddData(ShoewDataListActivity.this);
entry.open();
entry.createEntry(name);
entry.close();
} catch (Exception e) {
// e.printStackTrace();
didItWork = false;
String error = e.toString();
Dialog d = new Dialog(ShoewDataListActivity.this);
d.setTitle("What happend...!!");
TextView tv = new TextView(ShoewDataListActivity.this);
tv.setText("...." + error + "....");
d.setContentView(tv);
d.show();
} finally {
if (didItWork) {
// Dialog d = new Dialog(GroupActivity.this);
// d.setTitle("This is ok..........!!");
// TextView tv= new TextView(GroupActivity.this);
// tv.setText("....SuccessFull....");
// d.setContentView(tv);
// d.show();
Toast.makeText(getBaseContext(), "Project Saved",
Toast.LENGTH_LONG).show();
}
}
}
});
}
private void displayResultList() {
TextView tView = new TextView(this);
AddData info = new AddData(this);
ArrayList<String> results = new ArrayList<String>();
results = info.fatchData();
tView.setText("This data is retrieved from the database and only 4 "
+ "of the results are displayed");
getListView().addHeaderView(tView);
setListAdapter(new ArrayAdapter<String>(this,
android.R.layout.simple_list_item_1, results));
getListView().setTextFilterEnabled(true);
}
}
そして、私のDbhelperクラスです：
public class AddData {
public static final String TAG = DbHelper.class.getSimpleName();
public static final String DB_NAME = "Grup.db";
public static final int DB_VERSION = 1;
public static final String TABLE = "Grups";
public static final String C_ID = BaseColumns._ID;
public static final String C_CREATED_AT = "easy_ass_created_At";
public static final String C_NAME = "name";
private DbHelper ourHelper;
private final Context ourContext;
private SQLiteDatabase ourDatabase;
public class DbHelper extends SQLiteOpenHelper {
// public static final String TAG = DbHelper.class.getSimpleName();
// public static final String DB_NAME = "Grup.db";
// public static final int DB_VERSION = 1;
// public static final String TABLE = "Grups";
// public static final String C_ID = BaseColumns._ID;
// public static final String C_CREATED_AT = "easy_ass_created_At";
// public static final String C_NAME = "name";
public DbHelper(Context context) {
super(context, DB_NAME, null, DB_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db) {
String sql = ("create table " + TABLE + " (" + C_ID
+ " integer primary key autoincrement, " + C_NAME
+ " text not null" + ");");
db.execSQL(sql);
Log.d(TAG, "OnCreate sql" + sql);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
db.execSQL("drop table if exists " + TABLE);
this.onCreate(db);
Log.d("TAG", "********On Upgrate Drop Table*****");
}
}
public AddData(Context context) {
ourContext = context;
}
public AddData open() throws SQLException {
ourHelper = new DbHelper(ourContext);
ourDatabase = ourHelper.getReadableDatabase();
return this;
}
public void close() {
ourHelper.close();
}
public long createEntry(String name) {
ContentValues cv = new ContentValues();
cv.put(C_NAME, name);
return ourDatabase.insert(TABLE, null, cv);
}
public String getData() {
String[] columns = new String[] { C_ID, C_NAME };
Cursor c = ourDatabase.query(TABLE, columns, null, null, null, null,
null);
String result = "";
// int iRow=c.getColumnIndex(C_ID);
int iName = c.getColumnIndex(C_NAME);
// for(c.moveToFirst();!c.isAfterLast();c.moveToLast()){
for (boolean hasItem = c.moveToFirst(); hasItem; hasItem = c
.moveToNext()) {
result = result + " " + c.getString(iName) + "\n";
c.moveToNext();
}
c.close();
return result;
}
public ArrayList<String> fatchData(){
String[] columns = new String[] { C_ID, C_NAME };
Cursor c = ourDatabase.query(TABLE, columns, null, null, null, null,
null);
String result="";
ArrayList<String> result1=new ArrayList<String>();
// int iRow=c.getColumnIndex(C_ID);
int iName = c.getColumnIndex(C_NAME);
// for(c.moveToFirst();!c.isAfterLast();c.moveToLast()){
for (boolean hasItem = c.moveToFirst(); hasItem; hasItem = c
.moveToNext()) {
result = " " + c.getString(iName) + "\n";
result1.add(result);
c.moveToNext();
}
c.close();
return result1;
}
}
：https://github.com/ariefbayu/android-list-form-db – ariefbayu
どのようなエラーがありますか？ここに投稿してください。 –
私は – user1160288