I have read many articles about serious problem with dialog box that get disappear after screen orientation changes ! Actually the reason for the disappearance , when the screen orientation changes the Android sys. refresh the activity causing restart of activity class! But I have a solution for that hope u enjoy the matter!
Save state concept is used here, with android activity's override methods called
- Override the
onRetainNonConfigurationInstance() method to return the Object you would like to retain. - When your Activity is created again, call
getLastNonConfigurationInstance() to recover your Object.
thats
public Object onRetainNonConfigurationInstance() {
final MyDataObject data = collectMyLoadedData();
return data;
} This following lines should be declared in the on create method to get the state of the activity. final MyDataObject data = (MyDataObject) getLastNonConfigurationInstance();
if (data == null) {
data = loadMyData();
}
I am posting the code Hope U understand more clear......
code having two layout file main.xml contain only one button and second Layout file name contain two EDITTEXT and one button http://developer.android.com/guide/topics/resources/runtime-changes.html this is from where i got the info.... if u want to know more about this issue....
package in.ultraneo.savestate;
import java.security.PublicKey;
import android.app.Activity;
import android.content.DialogInterface;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
public class SavestateinandroidActivity extends Activity {
/** Called when the activity is first created. */
Button btn1;
Button btn2;
EditText edit1,edit2;
String DIALOGSTATUS="0";
String restore = "";
CustomizeDialog custo;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
btn1 = (Button)findViewById(R.id.button1);
MyDataObject data = (MyDataObject) getLastNonConfigurationInstance();
if (data == null) {
data = loadMyData();
new Toast(this).makeText(this, "there is no data",Toast.LENGTH_SHORT).show();
custo = new CustomizeDialog(this, R.layout.dialogstate);
DIALOGSTATUS="0";
edit1 = (EditText)custo.findViewById(R.id.editText1);
edit1.setText("");
edit2 = (EditText)custo.findViewById(R.id.editText2);
edit2.setText("");
btn2 = (Button)custo.findViewById(R.id.button1);
} else {
if(data.string3=="1")
{
DIALOGSTATUS="1";
restore = "1";
custo = new CustomizeDialog(this, R.layout.dialogstate);
edit1 = (EditText)custo.findViewById(R.id.editText1);
edit2 = (EditText)custo.findViewById(R.id.editText2);
edit1.setText(data.string1);
edit2.setText(data.string2);
custo.show();
}
}
custo.setOnShowListener(new DialogInterface.OnShowListener() {
@Override
public void onShow(DialogInterface dialog) {
DIALOGSTATUS="1";
new Toast(getBaseContext()).makeText(getBaseContext(),"Show", 1000).show();
}
});
custo.setOnDismissListener(new DialogInterface.OnDismissListener() {
@Override
public void onDismiss(DialogInterface dialog) {
DIALOGSTATUS="0";
edit1.setText("");
edit2.setText("");
restore ="0";
new Toast(getBaseContext()).makeText(getBaseContext(),"Dism", 1000).show();
}
});
btn1.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
restore = "1";
custo.show();
btn2.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
custo.dismiss();
}
});
}
});
}
private MyDataObject loadMyData() {
MyDataObject da = new MyDataObject();
return da;
}
public Object onRetainNonConfigurationInstance() {
final MyDataObject data = collectMyLoadedData();
return data;
}
private MyDataObject collectMyLoadedData() {
if(restore.equals("1")){
MyDataObject da = new MyDataObject();
da.string1 = edit1.getText().toString();
da.string2 = edit2.getText().toString();
da.string3 = DIALOGSTATUS;
return da;
}else
{
return null;
}
}
}
********************
package in.ultraneo.savestate;
public class MyDataObject {
String string1;
String string2;
String string3;
public MyDataObject loadMyData()
{
return this;
}
}
