Android Open Source - clusterkraf Single Choice Dialog Fragment

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License

The source code is released under:

Apache License

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Java Source Code

package com.twotoasters.clusterkraf.sample;
/*  w ww . j  a  v a 2 s . c om*/
import java.lang.ref.WeakReference;
import java.text.NumberFormat;

import android.app.Activity;
import android.app.AlertDialog;
import android.app.Dialog;
import android.content.DialogInterface;
import android.content.DialogInterface.OnClickListener;
import android.os.Bundle;
import android.support.v4.app.DialogFragment;
import android.support.v4.app.Fragment;

public class SingleChoiceDialogFragment extends DialogFragment {

  private WeakReference<Host> hostRef;

  public static final String KEY_TITLE = "title";
  public static final String KEY_OPTION = "option";
  public static final String KEY_CHOICES_STRINGS = "choices strings";
  public static final String KEY_CHOICES_INTS = "choices ints";
  public static final String KEY_SELECTION = "selection";

  public SingleChoiceDialogFragment() {
    // no-op
  }

  public static SingleChoiceDialogFragment newInstance(Bundle args) {
    if (args != null) {
      if (args.containsKey(KEY_TITLE) == false || args.containsKey(KEY_OPTION) == false
          || (args.containsKey(KEY_CHOICES_STRINGS) == false && args.containsKey(KEY_CHOICES_INTS) == false)
          || args.containsKey(KEY_SELECTION) == false) {
        throw new RuntimeException("at least one required arg was missing");
      }
    } else {
      throw new RuntimeException("args must not be null");
    }
    SingleChoiceDialogFragment fragment = new SingleChoiceDialogFragment();
    fragment.setArguments(args);
    return fragment;
  }

  @Override
  public Dialog onCreateDialog(Bundle savedInstanceState) {
    Dialog dialog = null;
    Activity activity = getActivity();
    Bundle args = getArguments();
    String title = args.getString(KEY_TITLE);
    String[] choices = new String[0];
    if (args.containsKey(KEY_CHOICES_STRINGS)) {
      choices = args.getStringArray(KEY_CHOICES_STRINGS);
    } else if (args.containsKey(KEY_CHOICES_INTS)) {
      int[] choicesInts = args.getIntArray(KEY_CHOICES_INTS);
      choices = new String[choicesInts.length];
      NumberFormat nf = NumberFormat.getInstance();
      for (int i = 0; i < choicesInts.length; i++) {
        choices[i] = nf.format(choicesInts[i]);
      }
    }
    int selection = args.getInt(KEY_SELECTION);
    if (activity != null) {
      AlertDialog.Builder builder = new AlertDialog.Builder(activity);
      builder.setTitle(title);
      builder.setSingleChoiceItems(choices, selection, new OnClickListener() {

        @Override
        public void onClick(DialogInterface dialog, int which) {
          Host host = hostRef.get();
          if (host != null) {
            host.onOptionChosen(getArguments().getInt(KEY_OPTION), which);
          } else {
            throw new RuntimeException("No host");
          }
          dialog.dismiss();
        }
      });
      dialog = builder.create();
    }
    return dialog;
  }

  public void setHost(Host host) {
    hostRef = new WeakReference<Host>(host);
  }

  @Override
  public void onAttach(Activity activity) {
    super.onAttach(activity);
    Fragment parent = getParentFragment();
    if (parent instanceof Host) {
      setHost((Host)parent);
    } else {
      throw new RuntimeException("Parent fragment must implement Host");
    }
  }

  public interface Host {
    void onOptionChosen(int option, int index);
  }
}

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