Thứ Hai, 9 tháng 7, 2012

PreferenceFragment with ListPreference

0
05:03
Last post describe a simple example of PreferenceFragment with CheckBoxPreference and EditTextPreference. ListPreference will be added on the PreferenceFragment in this exercise.

PreferenceFragment with ListPreference


First of all, create /res/values/arrays.xml to define our arrays of entries (listDisplayWord) and entryValues (listReturnValue).
<?xml version="1.0" encoding="utf-8"?>
<resources>
<string-array name="listDisplayWord">
<item>Option 1</item>
<item>Option 2</item>
<item>Option 3</item>
</string-array>
<string-array name="listReturnValue">
<item>1 is selected</item>
<item>2 is selected</item>
<item>3 is selected</item>
</string-array>
</resources>


Modify /res/xml/preferences.xml to add <ListPreference>.
<PreferenceScreen
xmlns:android="http://schemas.android.com/apk/res/android">

<PreferenceCategory
android:title="PreferenceCategory A">

<CheckBoxPreference
android:key="checkbox_preference"
android:title="title_checkbox_preference"
android:summary="summary_checkbox_preference" />

</PreferenceCategory>

<PreferenceCategory
android:title="PreferenceCategory B">

<EditTextPreference
android:key="edittext_preference"
android:title="title_edittext_preference"
android:summary="summary_edittext_preference"
android:dialogTitle="dialog_title_edittext_preference" />

</PreferenceCategory>

<PreferenceCategory
android:title="ListPreference">

<ListPreference
android:key="list_preference"
android:title="title_list_preference"
android:summary="summary_list_preference"
android:entries="@array/listDisplayWord"
android:entryValues="@array/listReturnValue"
android:dialogTitle="dialog_title_list_preference" />

</PreferenceCategory>

</PreferenceScreen>


Modify /res/layout/activity_main.xml (the main layout) to add a TextView to display ListPreference.
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >

<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="@dimen/padding_medium"
android:text="@string/hello_world"
tools:context=".MainActivity" />

<CheckBox
android:id="@+id/prefCheckBox"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="CheckBoxPreference" />

<TextView
android:id="@+id/prefEditText"
android:layout_width="fill_parent"
android:layout_height="wrap_content" />

<TextView
android:id="@+id/list_pref"
android:layout_width="fill_parent"
android:layout_height="wrap_content"/>

</LinearLayout>


package com.example.androidpreferencefragment;

import android.os.Bundle;
import android.preference.PreferenceManager;
import android.app.Activity;
import android.content.Intent;
import android.content.SharedPreferences;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.CheckBox;
import android.widget.TextView;

public class MainActivity extends Activity {

CheckBox prefCheckBox;
TextView prefEditText;
TextView myListPref;

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

prefCheckBox = (CheckBox)findViewById(R.id.prefCheckBox);
prefEditText = (TextView)findViewById(R.id.prefEditText);
myListPref = (TextView)findViewById(R.id.list_pref);

loadPref();
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {

/*
* Because it's onlt ONE option in the menu.
* In order to make it simple, We always start SetPreferenceActivity
* without checking.
*/

Intent intent = new Intent();
intent.setClass(MainActivity.this, SetPreferenceActivity.class);
startActivityForResult(intent, 0);

return true;
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
// TODO Auto-generated method stub
//super.onActivityResult(requestCode, resultCode, data);

/*
* To make it simple, always re-load Preference setting.
*/

loadPref();
}

private void loadPref(){
SharedPreferences mySharedPreferences = PreferenceManager.getDefaultSharedPreferences(this);

boolean my_checkbox_preference = mySharedPreferences.getBoolean("checkbox_preference", false);
prefCheckBox.setChecked(my_checkbox_preference);

String my_edittext_preference = mySharedPreferences.getString("edittext_preference", "");
prefEditText.setText(my_edittext_preference);

String myListPreference = mySharedPreferences.getString("list_preference", "1 is selected");
myListPref.setText(myListPreference);

}

}


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