问题与描述的完全一样。我正在使用 SQL 数据库来保存两个字符串和一个 int。int 是微调器的位置。它似乎可以很好地保存和更新，但是当我返回页面查看它时，它会重置微调器。我知道它保存了正确的位置，因为我的列表视图显示了保存的位置。
{*旁注（可能不重要）有趣地更改一个特定的代码行会更改微调器重置的内容。如果我使用该方法
trket.setSelection(codeIndex);
它将微调器设置在位置 3
但是，如果我使用代码
trket.setId(codeIndex);
它将微调器设置在位置 0}
现在我的代码。
这第一类是您查看/编辑/保存/删除条目的地方有很多额外的代码。对不起。它已经尽可能地修剪了。
public class TestEdit extends Activity implements OnClickListener,OnItemSelectedListener{
private long rowID;
private EditText caret,lapet;
private Spinner trket;
String a,b,c,message,pps,tys,rh1s,rh2s,sr1s,sr2s,de1s,de2s,dc1s,dc2s,ar1s,ar2s,c1s,c2s,t1s,t2s,bb1s,bb2s,li1s,li2s,la1s,la2s,lb1s,lb2s,df1s,df2s,g1s,g2s,g3s,g4s,g5s,g6s,g7s,gfs,tss,hps,tqs,lbs,mils,rpms,partss,commentss;
String[] paths = { "six","five", "four", "three", "two", "one"};
Button paste,sa,sh,cb;
int position;
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.test_tunepage);
caret = (EditText) findViewById(R.id.editText1);
lapet = (EditText) findViewById(R.id.editText2);
trket = (Spinner) findViewById(R.id.spinner1);
sa = (Button)findViewById(R.id.delete);
sa.setOnClickListener(this);
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, paths
);
trket.setAdapter(adapter);
trket.setOnItemSelectedListener(this);
Bundle extras = getIntent().getExtras();
if (extras != null)
{
rowID = extras.getLong("row_id");
caret.setText(extras.getString("car"));
lapet.setText(extras.getString("lap"));
trket.setSelection(position);
}
Button saveButton =(Button) findViewById(R.id.save);
saveButton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v)
{
if (caret.getText().length() != 0)
{
AsyncTask<Object, Object, Object> saveContactTask =
new AsyncTask<Object, Object, Object>()
{
@Override
protected Object doInBackground(Object... params)
{
saveContact();
return null;
}
@Override
protected void onPostExecute(Object result)
{
finish();
}
};
saveContactTask.execute((Object[]) null);
}
else
{
AlertDialog.Builder alert = new AlertDialog.Builder(TestEdit.this);
alert.setTitle(R.string.errorTitle);
alert.setMessage(R.string.errorMessage);
alert.setPositiveButton(R.string.errorButton, null);
alert.show();
}
}
});
}
private void deleteContact()
{
AlertDialog.Builder alertt = new AlertDialog.Builder(TestEdit.this);
alertt.setTitle(R.string.confirmTitle);
alertt.setMessage(R.string.confirmMessage);
alertt.setPositiveButton(R.string.delete_btn,
new DialogInterface.OnClickListener()
{
@Override
public void onClick(DialogInterface dialog, int button)
{
final TestDbCon dbConnector =
new TestDbCon(TestEdit.this);
AsyncTask<Long, Object, Object> deleteTask =
new AsyncTask<Long, Object, Object>()
{
@Override
protected Object doInBackground(Long... params)
{
dbConnector.deleteContact(params[0]);
return null;
}
@Override
protected void onPostExecute(Object result)
{
finish();
}
};
deleteTask.execute(new Long[] { rowID });
}
}
);
alertt.setNegativeButton(R.string.cancel_btn, null).show();
}
@Override
protected void onResume()
{
super.onResume();
new LoadContacts().execute(rowID);
}
private class LoadContacts extends AsyncTask<Long, Object, Cursor>
{
TestDbCon dbConnector = new TestDbCon(TestEdit.this);
@Override
protected Cursor doInBackground(Long... params)
{
try {
dbConnector.open();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return dbConnector.getOneContact(params[0]);
}
@Override
protected void onPostExecute(Cursor result)
{
super.onPostExecute(result);
if (result != null && result.moveToFirst()) {
// get the column index for each data item
int nameIndex = result.getColumnIndex("car");
int capIndex = result.getColumnIndex("lap");
int codeIndex = result.getColumnIndex("trk");
lapet.setText(result.getString(capIndex));
//trket.setId(codeIndex);
trket.setSelection(codeIndex);
caret.setText(result.getString(nameIndex));
}
result.close();
dbConnector.close();
}
}
private void saveContact()
{
TestDbCon dbConnector = new TestDbCon(this);
if (getIntent().getExtras() == null)
{
dbConnector.insertContact(
caret.getText().toString(),//1
lapet.getText().toString(),
trket.getLastVisiblePosition());
}
else
{
dbConnector.updateContact(rowID,
caret.getText().toString(),
lapet.getText().toString(),
trket.getLastVisiblePosition());
}
}
@Override
public void onClick(View v) {
switch(v.getId()){
case R.id.delete:
deleteContact();
break;}
}
private void getstrings() {
// TODO Auto-generated method stub
a=caret.getText().toString();
b=lapet.getText().toString();
}
@Override
public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2, long arg3) {
position = trket.getSelectedItemPosition();
}
@Override
public void onNothingSelected(AdapterView<?> arg0) {
// TODO Auto-generated method stub
}
}
我确实相信这是唯一重要的课程，但是如果您可能还想看其他内容，请告诉我。我会一直在这里查看。
谢谢！