public class SettingsActivity extends AppCompatActivity {
private Context context;
private DogDatabaseHelper dbHelper;
private ListView mListView;
private ArrayList<String> names = new ArrayList<String>();
@Override
public void onCreate(Bundle savedInstance){
super.onCreate(savedInstance);
setContentView(R.layout.settings);
mListView = (ListView)findViewById(R.id.listforall);
context = this;
DogDatabaseHelper dbHelper = new DogDatabaseHelper(getApplicationContext());
SQLiteDatabase db = dbHelper.getWritableDatabase();
Cursor cursor = db.rawQuery("select name from dog",null);
int count = cursor.getColumnIndex("name");
if(cursor.moveToFirst()){
do{
names.add(cursor.getString(cursor.getColumnIndex("name")));
}while (cursor.moveToNext());
AdapterForNames namesAdapter = new AdapterForNames(this,names);
namesAdapter.notifyDataSetChanged();
mListView.setAdapter(namesAdapter);
mListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> adapterView, View view, int position, long id) {
Intent intent = new Intent(SettingsActivity.this,SetupActivity.class);
intent.putExtra("name",names.get(position));
startActivity(intent);
}
});
}
}
这是ListView
我正在使用的,但是在更新数据库之后,我无法ListView
刷新,我想我应该在重新启动方法中放入一些代码?但不知道该怎么办。有什么帮助吗?
更改以下代码:
public class SettingsActivity extends AppCompatActivity {
private Context context;
private DogDatabaseHelper dbHelper;
private ListView mListView;
private ArrayList<String> names = new ArrayList<String>();
@Override
public void onCreate(Bundle savedInstance){
super.onCreate(savedInstance);
setContentView(R.layout.settings);
mListView = (ListView)findViewById(R.id.listforall);
context = this;
DogDatabaseHelper dbHelper = new DogDatabaseHelper(getApplicationContext());
SQLiteDatabase db = dbHelper.getWritableDatabase();
Cursor cursor = db.rawQuery("select name from dog",null);
int count = cursor.getColumnIndex("name");
if(cursor.moveToFirst()){
do{
names.add(cursor.getString(cursor.getColumnIndex("name")));
}while (cursor.moveToNext());
AdapterForNames namesAdapter = new AdapterForNames(this,names);
namesAdapter.notifyDataSetChanged();
mListView.setAdapter(namesAdapter);
mListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> adapterView, View view, int position, long id) {
Intent intent = new Intent(SettingsActivity.this,SetupActivity.class);
intent.putExtra("name",names.get(position));
startActivity(intent);
}
});
}
}
使用以下代码:
public class SettingsActivity extends AppCompatActivity {
private Context context;
private DogDatabaseHelper dbHelper;
private ListView mListView;
private ArrayList<String> names = new ArrayList<String>();
@Override
public void onCreate(Bundle savedInstance){
super.onCreate(savedInstance);
setContentView(R.layout.settings);
context = this;
AdapterForNames namesAdapter = new AdapterForNames(this,names);
mListView = (ListView)findViewById(R.id.listforall);
mListView.setAdapter(namesAdapter);
mListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> adapterView, View view, int position, long id) {
Intent intent = new Intent(SettingsActivity.this,SetupActivity.class);
intent.putExtra("name",names.get(position));
startActivity(intent);
}
});
DogDatabaseHelper dbHelper = new DogDatabaseHelper(getApplicationContext());
SQLiteDatabase db = dbHelper.getWritableDatabase();
Cursor cursor = db.rawQuery("select name from dog",null);
int count = cursor.getColumnIndex("name");
if(cursor.moveToFirst()){
do{
names.add(cursor.getString(cursor.getColumnIndex("name")));
namesAdapter.notifyDataSetChanged();
} while (cursor.moveToNext());
}
}
希望能帮助到你!
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