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.
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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
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: }