Passing the click events back to the dilaog's host in android

In this post i am going to show you how to get the dialog's click events back to the host activity or fragment. By default the click events of a dialog is handled by the DialogFragment. You can transfer the click events back to the host activity or fragment by declaring an interface in the dilalog class.

Ads by Google

---

---

In this example we have a TextView in the activity_main.xml file. We have to change the font color of the TextView using an alert dialog with single choice list. So the user can select a color from the dilalog and we set that particular color as the font color for the TextView.

ColorDialog.java

1:  public class ColorDialog extends DialogFragment  
2:  {  
3:   CharSequence[] sequence = {"RED","GREEN","BLUE"};  
4:   String color_selection;  
5:       @Override  
6:       public Dialog onCreateDialog(Bundle savedInstanceState) {  
7:            AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());  
8:            builder.setTitle("Choose your color...");  
9:            builder.setSingleChoiceItems(sequence, -1, new OnClickListener() {  
10:                 @Override  
11:                 public void onClick(DialogInterface dialog, int which) {  
12:                      color_selection = (String)sequence[which];  
13:                 }  
14:            });  
15:            builder.setPositiveButton("OK", new OnClickListener() {  
16:                 @Override  
17:                 public void onClick(DialogInterface dialog, int which) {  
18:                 color_interface.positiveClick(ColorDialog.this,color_selection);  
19:                 }  
20:            });  
21:            builder.setNegativeButton("CANCEL", new OnClickListener() {  
22:                 @Override  
23:                 public void onClick(DialogInterface dialog, int which) {  
24:                      color_interface.negetiveClick(ColorDialog.this);  
25:                 }  
26:            });  
27:            return builder.create();  
28:       }  
29:       public interface ColorInterface  
30:       {  
31:            public void positiveClick(DialogFragment dialog,String color_selection);  
32:            public void negetiveClick(DialogFragment dialog);  
33:       }  
34:       ColorInterface color_interface;  
35:       @Override  
36:            public void onAttach(Activity activity) {  
37:                 // TODO Auto-generated method stub  
38:                 super.onAttach(activity);  
39:                 try  
40:                 {  
41:                 color_interface = (ColorInterface) activity;  
42:                 }  
43:                 catch(ClassCastException e)  
44:                 {  
45:                      throw new ClassCastException(activity.toString() + "must override methods..");  
46:                 }  
47:            }  
48:  }  

MainActivity.java

1:  public class MainActivity extends FragmentActivity implements ColorInterface {  
2:  TextView text_view;  
3:       @Override  
4:       protected void onCreate(Bundle savedInstanceState) {  
5:            super.onCreate(savedInstanceState);  
6:            setContentView(R.layout.activity_main);  
7:            text_view = (TextView) findViewById(R.id.textView1);  
8:            text_view.setOnClickListener(new OnClickListener() {  
9:                 @Override  
10:                 public void onClick(View arg0) {  
11:                 ColorDialog dialog = new ColorDialog();  
12:                 dialog.show(getSupportFragmentManager(), "my_tag");  
13:                 }  
14:            });  
15:       }  
16:       @Override  
17:       public void positiveClick(DialogFragment dialog,String color_selection) {  
18:            if(color_selection.equals("RED"))  
19:            {  
20:                 text_view.setTextColor(Color.RED);  
21:            }  
22:            else if (color_selection.equals("BLUE"))  
23:            {  
24:                 text_view.setTextColor(Color.BLUE);  
25:            }  
26:            else if (color_selection.equals("GREEN"))  
27:            {  
28:                 text_view.setTextColor(Color.GREEN);  
29:            }       
30:       }  
31:       @Override  
32:       public void negetiveClick(DialogFragment dialog) {  
33:            Toast.makeText(getBaseContext(), "No color selected..",Toast.LENGTH_SHORT).show();  
34:       }  
35:  }  

CLICK HERE TO DOWNLOAD THIS PROJECT
CLICK HERE TO VIEW VIDEO TUTORIAL OF THIS TOPIC