What?
A quick article on how to display a OK/Cancel popup which I use as a message to the user for debug purposes.
Why?
It's similar to javascript's message box or confirm box, only Android let's you redesign the dialog. For my purposes I have used an XML as the layout.
How?
This displays a standard Ok/cancel message popup which you attach to some event
import android.app.AlertDialog;
import android.content.DialogInterface;
new AlertDialog.Builder(this)
.setTitle("Some Title")
.setMessage("some message")
.setPositiveButton("OK", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface arg0, int arg1) {
// Some stuff to do when ok got clicked
}
})
.setNegativeButton("cancel", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface arg0, int arg1) {
// Some stuff to do when cancel got clicked
}
})
.show();
Additional: Pre-populating default value and returning input
Lots of confusing answers out there on the web but here's an all-in-one where I
- Open an AlertDialog designed with a custom XML layout
- Set the hint text of a specific user input field (EditText)
- Store the input in a TextView (invisible or visible) held in the calling XML
/* 201411041253 */
private String hangar_aircraft_name;
public void editHangarAircraftName(View view) {
// get current value for hint
TextView currentName = (TextView) findViewById(R.id.hangar_aircraft_001_header);
hangar_aircraft_name = currentName.getText().toString();
// get the AlertDialog XML layout file
final View v = getLayoutInflater().inflate(R.layout.my_custom_dialog, null);
// set the hint of the EditText in the AlertDialog
EditText inputText = (EditText) v.findViewById(R.id.hangar_item_menu_name_field);
inputText.setHint(hangar_aircraft_name);
// Start building the AlertDialog
AlertDialog.Builder b = new AlertDialog.Builder(this);
// set the view of the AlertDialog along with changes (eg. changed "hint")
b.setView(v);
// set OK button action
b.setPositiveButton(R.string.button_ok, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int whichButton) {
// Get the f !!!
Dialog f = (Dialog) dialog;
// this is the EditText that has the value I want
EditText inputTemp = (EditText) f.findViewById(R.id.my_input_field);
// this is the TextView to store the value in (not the AlertDialog but main xml)
TextView newName = (TextView) findViewById(R.id.hangar_aircraft_001_name);
// setting header text to returned input
newName.setText(inputTemp.getText().toString());
}
});
// set Cancel button action
b.setNegativeButton(R.string.button_cancel, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
}
});
// create and show the alertDialog
b.create().show();
}
The key mistake I was doing was trying to recalculate which view the main activity item was in.
