Share Data Across Application in Android

                      Share Data Across Application in android using Shared Preference


* Android allow us to share data across applications.
* Context.MODE_WORLD_READABLE is important thing in shared preference for global data access.
* Run both project in the same emulator, Follow the below steps,


Step 1:

Create the android application name as "SharedPref1"

Package name as "com.sharepref1"

Copy the below code and paste it in main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <EditText
        android:id="@+id/edit_share_value"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" >
        <requestFocus />
    </EditText>

    <Button
        android:id="@+id/btn_share_value"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Share Data" />

</LinearLayout>


Copy the below code and paste it in your java class(SharedPref1Activity).

package com.sharedpref1;

import android.app.Activity;
import android.content.Context;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;

public class SharedPref1Activity extends Activity {
    EditText editShareValue;
    Button btnShareValue;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        btnShareValue = (Button) this.findViewById(R.id.btn_share_value);
        editShareValue = (EditText) this.findViewById(R.id.edit_share_value);

        btnShareValue.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub

                String strShareValue = editShareValue.getText().toString()
                        .trim();
                SharedPreferences prefs = getSharedPreferences("demopref",
                        Context.MODE_WORLD_READABLE);
                SharedPreferences.Editor editor = prefs.edit();
                editor.putString("demostring", strShareValue);
                editor.commit();

            }
        });
    }
}

save and run the program ,enter any data and click Share Data button.



Step 2:
Create the android application name as "SharedPref2"

Package name as "com.sharepref2"

Copy the below code and paste it in main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <TextView
        android:id="@+id/text_display_value"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceLarge" />

    <Button
        android:id="@+id/btn_display_value"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Display Value" />

</LinearLayout>


Copy the below code and paste it in your java class(SharedPref2Activity).


package com.sharedpref2;

import android.app.Activity;
import android.content.Context;
import android.content.SharedPreferences;
import android.content.pm.PackageManager.NameNotFoundException;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;

public class SharedPref2Activity extends Activity {
    TextView displaySharedValue;
    Button displayValue;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        displaySharedValue = (TextView) this
                .findViewById(R.id.text_display_value);
        displayValue = (Button) this.findViewById(R.id.btn_display_value);
        displayValue.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                Context con;
                try {

                    con = createPackageContext("com.sharedpref1", 0);
                    SharedPreferences pref = con.getSharedPreferences(
                            "demopref", Context.MODE_PRIVATE);
                    String data = pref.getString("demostring", "No Value");
                    displaySharedValue.setText(data);
                } catch (NameNotFoundException e) {
                    Log.e("Not data shared", e.toString());
                }
            }
        });

    }
}

save and run the program in the same emulator which you run the first one.

Now click DisplayValue button.Now you get the data which you entered in sharedpref1.

Full source code SharedPref