Here is source code of the Program to Write to Demonstrate Intent in Preference Screen in Android. The program is successfully compiled and run on a Windows system using Eclipse Ide. The program output is also shown below.
In some cases, you might want a preference item to open a different activity instead of a settings screen, such as a web browser to view a web page. To invoke an Intent when the user selects a preference item, add an element as a child of the corresponding element.
For example, here’s how you can use a preference item to open a web page:
<Preference android:title="@string/prefs_web_page" > <intent android:action="android.intent.action.VIEW" android:data="http://www.example.com" /> </Preference>
You can create both implicit and explicit intents using the following attributes:
android:action :- The action to assign, as per the setAction() method.
android:data :- The data to assign, as per the setData() method.
android:mimeType :- The MIME type to assign, as per the setType() method.
android:targetClass :- The class part of the component name, as per the setComponent() method.
android:targetPackage :- The package part of the component name, as per the setComponent() method.
MainActivity.java
package com.example.prefernceintent; import android.os.Bundle; import android.app.Activity; import android.content.Intent; import android.view.Menu; import android.view.View; import android.widget.Button; public class MainActivity extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); Button but2 = (Button) findViewById(R.id.button1); but2.setOnClickListener(new View.OnClickListener() { Intent in = new Intent("com.example.prefernceintent.Pref"); @Override public void onClick(View v) { // TODO Auto-generated method stub startActivity(in); } }); } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.main, menu); return true; } }
Pref.java
package com.example.prefernceintent; import java.util.List; import android.os.Bundle; import android.preference.PreferenceActivity; public class Pref extends PreferenceActivity { @Override protected void onCreate(Bundle savedInstanceState) { // TODO // Auto-generated method stub super.onCreate(savedInstanceState); addPreferencesFromResource(R.xml.pref); } }
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" android:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" tools:context=".MainActivity" > <Button android:id="@+id/button1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentBottom="true" android:layout_alignParentLeft="true" android:layout_alignParentRight="true" android:layout_marginBottom="188dp" android:text="LAUNCH" /> </RelativeLayout>
pref.xml
<?xml version="1.0" encoding="utf-8"?> <PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android" android:title="...." > <PreferenceScreen android:key="button_voicemail_category_key" android:persistent="false" android:title="voicemail" > <ListPreference android:key="button_voicemail_provider_key" android:title="voicemail_provider" /> <PreferenceScreen android:key="button_voicemail_setting_key" android:persistent="false" android:title="voicemail_settings" > </PreferenceScreen> <RingtonePreference android:key="button_voicemail_ringtone_key" android:ringtoneType="notification" android:title="voicemail_ringtone_title" /> <Preference android:title="prefs_web_page" > <intent android:action="android.intent.action.VIEW" android:data="http://www.google.com" /> </Preference> </PreferenceScreen> </PreferenceScreen>
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.example.prefernceintent" android:versionCode="1" android:versionName="1.0" > <uses-sdk android:minSdkVersion="11" android:targetSdkVersion="17" /> <application android:allowBackup="true" android:icon="@drawable/ic_launcher" android:label="@string/app_name" android:theme="@style/AppTheme" > <activity android:name="com.example.prefernceintent.MainActivity" android:label="@string/app_name" > <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> <activity android:name="com.example.prefernceintent.Pref" android:theme="@android:style/Theme.Black.NoTitleBar" > <intent-filter> <action android:name="com.example.prefernceintent.Pref" /> <category android:name="android.intent.category.DEFAULT" /> </intent-filter> </activity> </application> </manifest>
