Hi Friends
Today i am going to explain Android SharedPreferences.
Android SharedPreferences:
Android supports the usage of the SharedPreferences class for persisting key-value pairs (preferences)of primitive data types in the Android file system.
The definition of these preferences can be done via an XML resource.
The
PreferenceManager class provides methods to get access to preferences stored in a certain file. Step to Create SharedPreference:-
1. create object of SharedPreference in following way.
SharedPreferences spref = (SharedPreferences)PreferenceManager.getDefaultSharedPreferences(this);
2. Getting value from SharedPreference:
count = spref.getInt("appcount", 0);
3. Setting new value for preference:
SharedPreferences.Editor editor = spref.edit();
editor.putInt("appcount", count);
editor.commit(); // Very important
Now i am going to explain shared preference with very simple example that count how many times your application open.
Java Source code for application:-
package in.androidshivendra.sharedpreferenceexample;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.app.Activity;
import android.content.SharedPreferences;
import android.view.Menu;
import android.widget.TextView;
import android.widget.Toast;
public class MainActivity extends Activity {
TextView tv;
SharedPreferences spref;
int count ;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
spref= (SharedPreferences)PreferenceManager.getDefaultSharedPreferences(this);
count = spref.getInt("appcount", 1);
tv = (TextView)findViewById(R.id.textView1);
tv.setText("you have "+count+"time open it");
count++;
SharedPreferences.Editor editor = spref.edit();
editor.putInt("appcount", count);
editor.commit(); // Very important
}
@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;
}
}
Layout xml code:-
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" >
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/hello_world" />
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:text="Large Text"
android:textAppearance="?android:attr/textAppearanceLarge" />
OutPutScreen:-
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