4.preference management

Preference Management
Step1. Create a newAndroidProject.
Step2. Add the followingcode toyouractivityxml file andname itas “main.xml”.
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<Button
android:id="@+id/check_pref_button"
android:layout_height="wrap_content"
android:text="@string/view_username_string"
android:textSize="24sp"
android:padding="24dp"
android:gravity="center" >
</Button>
</LinearLayout>
Add“user_prefs_fragment.xml”
<fragment xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/userPreferenceFragment"
android:layout_height="match_parent"
class="YourPackagename.ViewAndUpdatePreferencesActivity$UserPr
eferenceFragment"
android:orientation="vertical" >
</fragment>
Addthe followingcode inthe “layout/xml/user_prefs.xml
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android"
android:key="@+id/pref_screen" >
<EditTextPreference
android:dialogMessage="Enter Your User Name"
android:dialogTitle="Change User Name"
android:key="uname"
android:negativeButtonText="Cancel"
android:positiveButtonText="Submit"
android:title="User Name"

>
</EditTextPreference>
</PreferenceScreen>
Step3. Add the followingcode intoyour“values.xml file
<string name="view_username_string">View User Name</string>
Step4. Your androidmanifestshouldlike this.
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.zaheerabbas.myapplication">
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" >
</uses-permission>
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity android:name=".PreferencesActivityExample">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".ViewAndUpdatePreferencesActivity" >
</activity>
</application>
</manifest>
Step5. Add these twoactivities.
PreferencesActivityExample
public class PreferencesActivityExample extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
// Open a User Preferences Entry Activity

final Button button = (Button) findViewById(R.id.check_pref_button);
button.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
startActivity(new Intent(
PreferencesActivityExample.this,
ViewAndUpdatePreferencesActivity.class));
}
});
}
}
ViewAndUpdatePreferencesActivity
public class ViewAndUpdatePreferencesActivity extends Activity {
private static final String USERNAME = "uname";
@Override
protected void onCreate(Bundle savedInstanceState) {
setContentView(R.layout.user_prefs_fragment);
}
// Fragment that displays the username preference
public static class UserPreferenceFragment extends PreferenceFragment {
protected static final String TAG = "UserPrefsFragment";
private OnSharedPreferenceChangeListener mListener;
private Preference mUserNamePreference;
@Override
public void onCreate(Bundle savedInstanceState) {
// Load the preferences from an XML resource
addPreferencesFromResource(R.xml.user_prefs);
// Get the username Preference
mUserNamePreference = (Preference) getPreferenceManager()
.findPreference(USERNAME);
// Attach a listener to update summary when username changes
mListener = new OnSharedPreferenceChangeListener() {
@Override
public void onSharedPreferenceChanged(
SharedPreferences sharedPreferences, String key) {
mUserNamePreference.setSummary(sharedPreferences.getString(
USERNAME, "None Set"));
}
};
// Get SharedPreferences object managed by the PreferenceManager for
// this Fragment
SharedPreferences prefs = getPreferenceManager()
.getSharedPreferences();

// Register a listener on the SharedPreferences object
prefs.registerOnSharedPreferenceChangeListener(mListener);
// Invoke callback manually to display the current username
mListener.onSharedPreferenceChanged(prefs, USERNAME);
}
}
}
Step7. Done.

4.preference management

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