我想要保存按鈕在數據庫中點擊選中複選框的位置並關閉應用程序。使用這些位置,當我打開應用程序時,恢復複選框的選定狀態。任何人都可以幫助我嗎?在sqlite數據庫中保存所選複選框的位置並恢復複選框的狀態
public class MainActivity extends AppCompatActivity {
MyCustomAdapter dataAdapter = null;
String str, str1;
SharedPreferences pref;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
pref = getSharedPreferences("MYPref", Context.MODE_PRIVATE);
str1 = pref.getString("key","");
List<String> list = Arrays.asList(str1.split(","));
System.out.println(list);
displayListView();
checkButtonClick();
}
private void displayListView()
{
//HERE I WANT TO RETRIEVE THE POSITIONS TO SET EARLIER SELECTED CHECKOX AGAIN SELECTED
\t \t
ArrayList<States> stateList = new ArrayList<States>();
States _states = new States("AP","Andhra Pradesh",false);
stateList.add(_states);
_states = new States("DL","Delhi",false);
stateList.add(_states);
_states = new States("GA","Goa",false);
stateList.add(_states);
_states = new States("JK","Jammu & Kashmir",false);
stateList.add(_states);
_states = new States("KA","Karnataka",false);
stateList.add(_states);
_states = new States("KL","Kerala",false);
stateList.add(_states);
_states = new States("RJ","Rajasthan",false);
stateList.add(_states);
_states = new States("WB","West Bengal",false);
stateList.add(_states);
dataAdapter = new MyCustomAdapter(this,R.layout.state_info, stateList);
ListView listView = (ListView) findViewById(R.id.listView1);
listView.setAdapter(dataAdapter);
}
private void checkButtonClick()
{
Button myButton = (Button) findViewById(R.id.findSelected);
myButton.setOnClickListener(new View.OnClickListener()
{
@Override
public void onClick(View v)
{
StringBuffer responseText = new StringBuffer();
responseText.append("The following were selected...\n");
ArrayList<States> stateList = dataAdapter.stateList;
for(int i=0;i<stateList.size();i++)
{
States state = stateList.get(i);
if(state.isSelected())
{
responseText.append("\n" + state.getName());
// HERE I WANT TO SAVE POSITIONS
}
}
Toast.makeText(getApplicationContext(),
responseText, Toast.LENGTH_LONG).show();
}
});
}
}
public class MyCustomAdapter extends ArrayAdapter<States> {
public ArrayList<States> stateList;
public MyCustomAdapter(Context context, int textViewResourceId, ArrayList<States> stateList)
{
super(context, textViewResourceId, stateList);
this.stateList = new ArrayList<States>();
this.stateList.addAll(stateList);
}
private class ViewHolder
{
TextView code;
CheckBox name;
}
@Override
public View getView(int position, View convertView, ViewGroup parent)
{
ViewHolder holder = null;
Log.v("ConvertView", String.valueOf(position));
if (convertView == null)
{
LayoutInflater vi = (LayoutInflater)getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = vi.inflate(R.layout.state_info, null);
holder = new ViewHolder();
holder.code = (TextView) convertView.findViewById(R.id.code);
holder.name = (CheckBox) convertView.findViewById(R.id.checkBox1);
convertView.setTag(holder);
holder.name.setOnClickListener(new View.OnClickListener()
{
public void onClick(View v)
{
CheckBox cb = (CheckBox) v;
States _state = (States) cb.getTag();
/* Toast.makeText(getApplicationContext(), "Clicked on Checkbox: " + cb.getText() + " is " + cb.isChecked(),
Toast.LENGTH_LONG).show();*/
_state.setSelected(cb.isChecked());
}
});
}
else
{
holder = (ViewHolder) convertView.getTag();
}
States state = stateList.get(position);
holder.code.setText(" (" + state.getCode() + ")");
holder.name.setText(state.getName());
holder.name.setChecked(state.isSelected());
holder.name.setTag(state);
return convertView;
}
}
public class States {
String code = null;
String name = null;
boolean selected = false;
public States(String code, String name, boolean selected) {
this.code = code;
this.name = name;
this.selected = selected;
}
public String getCode() {
return code;
}
public void setCode(String code) {
this.code = code;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public boolean isSelected() {
return selected;
}
public void setSelected(boolean selected) {
this.selected = selected;
}
}
因此你的數據庫是你的SharedPreferences?你爲什麼不使用SQLiteDatabase – kggoh
你能告訴我如何保存位置並使用sqlite恢復複選框嗎? –