How to Update Android Activity's UI from Alert Dialog

Question

I have an Activity whose layout is in the file main.xml that contains a TextView with the id my_view and a Button with the id open_alert . Clicking on the button will open an AlertDialog which is dismissed on clicking ok. Once the AlertDialog is cancelled i need to update the value of the TextView from the activity.

I am not able to update the value of TextView from the activity.

Answer 1

Just implement onClick listener for positive button:

new AlertDialog.Builder(this)
  .setPositiveButton(R.string.ok, new DialogInterface.OnClickListener() {
     public void onClick(DialogInterface dialog, int whichButton)
     {
       TextView text = (TextView) v.findViewById(R.id.my_view);
       if (text != null)
       {
         text.setText("new text");
       }
     })
  .setNegativeButton(R.string.cancel, null).create().show();

Answer 2

One way is to restart the activity on the OnClickListener in your Alert. If you want to pass a value into the view, just add an extra attribute in the intent and reset the value in the TextView. I have posted a rough code for reference.

alert.setNeutralButton("OK", new OnClickListener() {

        public void onClick(DialogInterface dialog, int which) {
            //create a new intent
            Intent intent = new Intent("YOUR ACTIVITY NAME");
            //add your value in the intent
            int value = //your value
            intent.putExtra("value",value );
                            //start your activity
            startActivity(intent);
        }
    });

and in your activity

Intent intent = getIntent();
yourTextView.setText(intent.getExtras().getString("value"));

Don't know if this is the most efficient way to do it, but should work.

Answer 3

First, you should make sure that the android:editable attribute is present in the XML file and set to true for the target TextView. Then, in the onClick() method you will just need to use setText().