Android How to - Create email preference dialog

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The following code shows how to create preference dialog for email value.

Example

res/xml/prefs.xml

<?xml version="1.0" encoding="utf-8"?>
<!--
  Copyright (c) 2012 Manning
  See the file license.txt for copying permission.
-->

<PreferenceScreen
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:key="pref_first_preferencescreen_key"
    android:title="Preferences">

    <PreferenceCategory
        android:title="User">

        <EditTextPreference
            android:key="pref_username"
            android:summary="Username:"
            android:title="Username"/>

    </PreferenceCategory>

    <PreferenceCategory
        android:title="Application">

        <Preference
            android:key="pref_rate"
            android:summary="Rate the app in the store!"
            android:title="Rate the app"/>

        <Preference
            android:key="pref_share"
            android:summary="Share the app with your friends"
            android:title="Share it"/>

        <com.manning.androidhacks.hack004.preference.EmailDialog
            android:dialogIcon="@drawable/ic_launcher"
            android:dialogTitle="Send Feedback"
            android:dialogMessage="Do you want to send an email with feedback?"
            android:key="pref_sendemail_key"
            android:negativeButtonText="Cancel"
            android:positiveButtonText="OK"
            android:summary="Send your feedback by e-mail"
            android:title="Send Feedback"/>

        <com.manning.androidhacks.hack004.preference.AboutDialog
            android:dialogIcon="@drawable/ic_launcher"
            android:dialogTitle="About"
            android:key="pref_about_key"
            android:negativeButtonText="@null"
            android:title="About"/>

    </PreferenceCategory>

</PreferenceScreen>

Main activity Java code

/*******************************************************************************
 * Copyright (c) 2012 Manning/*w w  w.  j a v  a2 s .com*/
 * See the file license.txt for copying permission.
 ******************************************************************************/

import android.content.Intent;
import android.content.SharedPreferences;
import android.content.SharedPreferences.OnSharedPreferenceChangeListener;
import android.net.Uri;
import android.os.Bundle;
import android.preference.EditTextPreference;
import android.preference.Preference;
import android.preference.PreferenceActivity;

public class MainActivity extends PreferenceActivity implements
    OnSharedPreferenceChangeListener {

  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    addPreferencesFromResource(R.xml.prefs);

    Preference sharePref = findPreference("pref_share");
    Intent shareIntent = new Intent();
    shareIntent.setAction(Intent.ACTION_SEND);
    shareIntent.setType("text/plain");
    shareIntent.putExtra(Intent.EXTRA_SUBJECT, "Check this app!");
    shareIntent.putExtra(Intent.EXTRA_TEXT,
        "Check this awesome app at: ...");
    sharePref.setIntent(shareIntent);

    Preference ratePref = findPreference("pref_rate");
    Uri uri = Uri.parse("market://details?id=" + getPackageName());
    Intent goToMarket = new Intent(Intent.ACTION_VIEW, uri);
    ratePref.setIntent(goToMarket);

    updateUserText();
  }

  @Override
  protected void onResume() {
    super.onResume();

    getPreferenceScreen().getSharedPreferences()
        .registerOnSharedPreferenceChangeListener(this);

  }

  @Override
  protected void onPause() {
    super.onPause();

    getPreferenceScreen().getSharedPreferences()
        .unregisterOnSharedPreferenceChangeListener(this);
  }

  @Override
  public void onSharedPreferenceChanged(
      SharedPreferences sharedPreferences, String key) {

    if (key.equals("pref_username")) {
      updateUserText();
    }
  }

  private void updateUserText() {
    EditTextPreference pref;
    pref = (EditTextPreference) findPreference("pref_username");
    String user = pref.getText();

    if (user == null) {
      user = "?";
    }

    pref.setSummary(String.format("Username: %s", user));
  }
}

Launch Email Util Java code

/*******************************************************************************
 * Copyright (c) 2012 Manning/*  w w  w . j  a v a 2s .co m*/
 * See the file license.txt for copying permission.
 ******************************************************************************/
package com.manning.androidhacks.hack004.util;

import android.content.Context;
import android.content.Intent;

public class LaunchEmailUtil {

  public static void launchEmailToIntent(Context context) {
    Intent intent = new Intent(Intent.ACTION_SEND);
    intent.setType("message/rfc822");
    intent.putExtra(Intent.EXTRA_EMAIL,
        new String[] { "feed@back.com" });
    intent.putExtra(Intent.EXTRA_SUBJECT, "[50AH] Feedback");
    intent.putExtra(Intent.EXTRA_TEXT, "Feedback:\n");
    context
        .startActivity(Intent.createChooser(intent, "Send feedback"));
  }
}

AboutDialog Java file

/*******************************************************************************
 * Copyright (c) 2012 Manning/*  w  w w  .  j av a  2 s. c  o m*/
 * See the file license.txt for copying permission.
 ******************************************************************************/

import android.content.Context;
import android.content.pm.PackageManager.NameNotFoundException;
import android.preference.DialogPreference;
import android.text.Html;
import android.text.method.LinkMovementMethod;
import android.util.AttributeSet;
import android.view.View;
import android.widget.LinearLayout;
import android.widget.TextView;

public class AboutDialog extends DialogPreference {

  private Context mContext;
  private String mVersionNumber;

  public AboutDialog(Context context) {
    this(context, null);
  }

  public AboutDialog(Context context, AttributeSet attrs) {
    this(context, attrs, 0);

  }

  public AboutDialog(Context context, AttributeSet attrs, int defStyle) {
    super(context, attrs, defStyle);
    mContext = context;
  }

  @Override
  protected View onCreateDialogView() {
    LinearLayout layout = new LinearLayout(mContext);
    layout.setOrientation(LinearLayout.VERTICAL);
    TextView splashText = new TextView(mContext);
    String fmt = "Version %s<br />"
        + "<a href=\"http://manning.com/sessa\">MoreInfo</a>";
    try {
      String pkg = mContext.getPackageName();
      mVersionNumber = mContext.getPackageManager().getPackageInfo(pkg,
          0).versionName;
    } catch (NameNotFoundException e) {
      e.printStackTrace();
    }

    if (mVersionNumber != null) {
      String aboutMsg = String.format(fmt, mVersionNumber);
      splashText.setText(Html.fromHtml(aboutMsg));
      splashText.setMovementMethod(LinkMovementMethod.getInstance());
    }

    layout.addView(splashText);

    return layout;
  }
}

EmailDialog Java code

/*******************************************************************************
 * Copyright (c) 2012 Manning//w  w w  .  j  av  a2s.c  o  m
 * See the file license.txt for copying permission.
 ******************************************************************************/
import android.content.Context;
import android.content.DialogInterface;
import android.preference.DialogPreference;
import android.util.AttributeSet;

public class EmailDialog extends DialogPreference {
  Context mContext;

  public EmailDialog(Context context) {
    this(context, null);
  }

  public EmailDialog(Context context, AttributeSet attrs) {
    this(context, attrs, 0);
  }

  public EmailDialog(Context context, AttributeSet attrs, int defStyle) {
    super(context, attrs, defStyle);
    mContext = context;
  }

  @Override
  public void onClick(DialogInterface dialog, int which) {
    super.onClick(dialog, which);

    if (DialogInterface.BUTTON_POSITIVE == which) {
      LaunchEmailUtil.launchEmailToIntent(mContext);
    }
  }
}

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