안드로이드 Activity 끼리 파라미터 전달하기.

http://about-android.blogspot.com/2009/12/passing-data-or-parameter-to-another.html

Shared Preference
Preferences are typically name value pairs. They can be stored as “Shared Preferences” across various activities in an application (note currently it cannot be shared across processes). First we need to put our value in to the context. And the context object lets you retrieve SharedPreferences through the method Context.getSharedPreferences().

1. Make a Shared Preference Collection
2. Retrieve Shared Preference Collection

Make a Shared Preference Collection
    SharedPreferences myPrefs = this.getSharedPreferences("contact", MODE_WORLD_READABLE);
    SharedPreferences.Editor prefsEditor = myPrefs.edit();
    prefsEditor.putString("sample", "this is test commands");
    prefsEditor.commit();

Retrieve Shared Preference Collection
    SharedPreferences myPrefs = this.getSharedPreferences("contact", MODE_WORLD_READABLE);
    prefsEditor.getString("sample", "DEFAULT VALUE");


 1. Create a two Activity [MainActivity & ChildActivity]
 
Activity : 1 -  MainActivity
 public class MainActivity extends Activity {
     /** Called when the activity is first created. */
     @Override
     public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.main);
     }
}
 
 Activity : 2 - ChildActivity
 public class ChildActivity extends Activity {
     /**
      * @see android.app.Activity#onCreate(Bundle)
      */
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         // TODO Put your code here
     }
 }
 

2.  Define Your Shared collection
    SharedPreferences myPrefs = this.getSharedPreferences("contact", MODE_WORLD_READABLE);
        SharedPreferences.Editor prefsEditor = myPrefs.edit();
        prefsEditor.putString("sample", "this is test commands");
        prefsEditor.commit();      

3. Call the child Activity from mainactivity
    startActivity(new Intent(this,ChildActivity.class));
 
4. Get the Value from MainActivity in ChildActivity
     SharedPreferences myPrefs = this.getSharedPreferences("contact", MODE_WORLD_READABLE);

5. Toast the Message
    Toast.makeText(this, myPrefs.getString("sample", "DEFAULT VALUE"), Toast.LENGTH_LONG).show();   
 
 
 Full Source :MainActivity.java
 
 import android.app.Activity;
 import android.content.Intent;
 import android.content.SharedPreferences;
 import android.os.Bundle;
 
 public class MainActivity extends Activity {
     /** Called when the activity is first created. */
     @Override
     public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.main);
         SharedPreferences myPrefs = this.getSharedPreferences("contact", MODE_WORLD_READABLE);
         SharedPreferences.Editor prefsEditor = myPrefs.edit();
         prefsEditor.putString("sample", "this is test commands");
         prefsEditor.commit();       
         startActivity(new Intent(this,ChildActivity.class));
     }
}

-------ChildActivity.java----------
import android.app.Activity;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.widget.Toast;

public class ChildActivity extends Activity {
    /**
     * @see android.app.Activity#onCreate(Bundle)
     */
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        SharedPreferences myPrefs = this.getSharedPreferences("contact", MODE_WORLD_READABLE);
        Toast.makeText(this, myPrefs.getString("sample", "DEFAULT VALUE"), Toast.LENGTH_LONG).show();       
    }
}