Reading
Add Comment
Android shared preference Example code
Android Shared preferences are used to store data in key and value pair so that we can retrieve the value on the basis of key.
It is widely used to get information from user such as in settings.
Android Preferences Example
How about we see a straightforward case of android shared preference.
activity_main.xml
File: activity_main.xml
<RelativeLayout 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"
tools:context=".MainActivity" >
<TextView
android:id="@+id/txtPrefs"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:text="Data:" />
<Button
android:id="@+id/storeinformation"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/showinformation"
android:layout_centerHorizontal="true"
android:layout_marginTop="18dp"
android:text="Store Information" />
<Button
android:id="@+id/showinformation"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="17dp"
android:text="Show Information" />
</RelativeLayout>
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity" >
<TextView
android:id="@+id/txtPrefs"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:text="Data:" />
<Button
android:id="@+id/storeinformation"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/showinformation"
android:layout_centerHorizontal="true"
android:layout_marginTop="18dp"
android:text="Store Information" />
<Button
android:id="@+id/showinformation"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="17dp"
android:text="Show Information" />
</RelativeLayout>
array.xml
File: array.xml
<?xml version="1.0" encoding="utf-8"?>
<resources>
<string-array name="listOptions">
<item>English</item>
<item>Hindi</item>
<item>Other</item>
</string-array>
<string-array name="listValues">
<item>English Language</item>
<item>Hindi Language</item>
<item>Other Language</item>
</string-array>
</resources>
<resources>
<string-array name="listOptions">
<item>English</item>
<item>Hindi</item>
<item>Other</item>
</string-array>
<string-array name="listValues">
<item>English Language</item>
<item>Hindi Language</item>
<item>Other Language</item>
</string-array>
</resources>
prefs.xml
File: prefs.xml
<?xml version="1.0" encoding="utf-8"?>
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android" >
<PreferenceCategory
android:summary="Username and password information"
android:title="Login information" >
<EditTextPreference
android:key="username"
android:summary="Please enter your login username"
android:title="Username" />
<EditTextPreference
android:key="password"
android:summary="Enter your password"
android:title="Password" />
</PreferenceCategory>
<PreferenceCategory
android:summary="Username and password information"
android:title="Settings" >
<CheckBoxPreference
android:key="checkBox"
android:summary="On/Off"
android:title="Keep me logged in" />
<ListPreference
android:entries="@array/listOptions"
android:entryValues="@array/listValues"
android:key="listpref"
android:summary="List preference example"
android:title="List preference" />
</PreferenceCategory>
</PreferenceScreen>
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android" >
<PreferenceCategory
android:summary="Username and password information"
android:title="Login information" >
<EditTextPreference
android:key="username"
android:summary="Please enter your login username"
android:title="Username" />
<EditTextPreference
android:key="password"
android:summary="Enter your password"
android:title="Password" />
</PreferenceCategory>
<PreferenceCategory
android:summary="Username and password information"
android:title="Settings" >
<CheckBoxPreference
android:key="checkBox"
android:summary="On/Off"
android:title="Keep me logged in" />
<ListPreference
android:entries="@array/listOptions"
android:entryValues="@array/listValues"
android:key="listpref"
android:summary="List preference example"
android:title="List preference" />
</PreferenceCategory>
</PreferenceScreen>
Preference Activity Class
File: PreferenceDemoActivity.java
package com.example.preferences;
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.View;
import android.widget.Button;
import android.widget.TextView;
public class PreferenceDemoActivity extends Activity {
TextView textView;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button storeinformation = (Button) findViewById(R.id.storeinformation);
Button showinformation = (Button) findViewById(R.id.showinformation);
textView = (TextView) findViewById(R.id.txtPrefs);
View.OnClickListener listener = new View.OnClickListener() {
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.storeinformation:
Intent intent = new Intent(PreferenceDemoActivity.this,PrefsActivity.class);
startActivity(intent);
break;
case R.id.showinformation:
displaySharedPreferences();
break;
default:
break;
}
}
};
storeinformation.setOnClickListener(listener);
showinformation.setOnClickListener(listener);
}
private void displaySharedPreferences() {
SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(PreferenceDemoActivity.this);
String username = prefs.getString("username", "Default NickName");
String passw = prefs.getString("password", "Default Password");
boolean checkBox = prefs.getBoolean("checkBox", false);
String listPrefs = prefs.getString("listpref", "Default list prefs");
StringBuilder builder = new StringBuilder();
builder.append("Username: " + username + "\n");
builder.append("Password: " + passw + "\n");
builder.append("Keep me logged in: " + String.valueOf(checkBox) + "\n");
builder.append("List preference: " + listPrefs);
textView.setText(builder.toString());
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}
}
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.View;
import android.widget.Button;
import android.widget.TextView;
public class PreferenceDemoActivity extends Activity {
TextView textView;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button storeinformation = (Button) findViewById(R.id.storeinformation);
Button showinformation = (Button) findViewById(R.id.showinformation);
textView = (TextView) findViewById(R.id.txtPrefs);
View.OnClickListener listener = new View.OnClickListener() {
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.storeinformation:
Intent intent = new Intent(PreferenceDemoActivity.this,PrefsActivity.class);
startActivity(intent);
break;
case R.id.showinformation:
displaySharedPreferences();
break;
default:
break;
}
}
};
storeinformation.setOnClickListener(listener);
showinformation.setOnClickListener(listener);
}
private void displaySharedPreferences() {
SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(PreferenceDemoActivity.this);
String username = prefs.getString("username", "Default NickName");
String passw = prefs.getString("password", "Default Password");
boolean checkBox = prefs.getBoolean("checkBox", false);
String listPrefs = prefs.getString("listpref", "Default list prefs");
StringBuilder builder = new StringBuilder();
builder.append("Username: " + username + "\n");
builder.append("Password: " + passw + "\n");
builder.append("Keep me logged in: " + String.valueOf(checkBox) + "\n");
builder.append("List preference: " + listPrefs);
textView.setText(builder.toString());
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}
}
PrefsActivity class
File: PrefsActivity.java
package com.example.preferences;
import android.os.Bundle;
import android.preference.PreferenceActivity;
public class PrefsActivity extends PreferenceActivity{
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
addPreferencesFromResource(R.xml.prefs);
}
}
import android.os.Bundle;
import android.preference.PreferenceActivity;
public class PrefsActivity extends PreferenceActivity{
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
addPreferencesFromResource(R.xml.prefs);
}
}
Android Preferences ExampleAndroid shared preference is used to store and retrieve primitive information. In android, string, integer, long, number etc. are considered as primitive data type.Android Shared preferences are used to store data in key and value pair so that we can retrieve the value on the basis of key. It is widely used to get information from user such as in settings. Android Preferences ExampleLet's see a simple example of android shared preference.activity_main.xmlDrag one textview and two buttons from the pallete.
File: activity_main.xml
array.xmlIt is created inside res/values directory.
File: array.xml
prefs.xmlIt is created inside res/xml directory.
File: prefs.xml
Preference Demo Activity Class
File: PreferenceDemoActivity.java
PrefsActivity class
File: PrefsActivity.java
Output: |
0 comments:
Post a Comment