تبادل اطلاعات بین اکتیویتی ها با اینتنت (Intent)

<Button
	android:id="@+id/button1"
	android:layout_width="wrap_content"
	android:layout_height="wrap_content"
	android:text="Click to go to the second Activity"
	android:onClick="onClick" />

<?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:layout_width="fill_parent"
		android:layout_height="wrap_content"
		android:text="welcome to second Activity"/>

	<Button
		android:id="@+id/button1"
		android:layout_width="wrap_content"
		android:layout_height="wrap_content"
		android:text="click to return to main activity"
		android:onClick="onClick2" />
</LinearLayout>

package com.example.passingdata;
import android.app.Activity;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.view.View;
import android.widget.*;
public class SecondActivity extends Activity {
	@Override
	public void onCreate(Bundle savedInstanceState)
	{
		super.onCreate(savedInstanceState);
		setContentView(R.layout.secondactivity);
		
		//--get the data passed in using getStrigExtra()--
		Toast.makeText(this, getIntent().getStringExtra("str1"),
		Toast.LENGTH_SHORT).show();
		
		//--get the data passed in using getIntExtra--
		Toast.makeText(this, Integer.toString(getIntent().getIntExtra("age1", 0)),
		Toast.LENGTH_SHORT).show();
		
		//--get the Bundle passed in--
		Bundle b = getIntent().getExtras();
		
		//--get the data using the get String()--
		Toast.makeText(this, b.getString("str2"), Toast.LENGTH_SHORT).show();
		
		//--get the data using the getInt()--
		Toast.makeText(this, Integer.toString(b.getInt("age2")),
		Toast.LENGTH_SHORT).show();
	}
	public void onClick2(View v)
	{
		//--use an Intent object to return data--
		Intent i=new Intent();
		
		//--use the putExtra() method to return some value..--
		i.putExtra("age3", 45);
		
		//--use the setData() method to return some value--
		i.setData(Uri.parse("something passed back to main activity"));
		
		//--set the result with the OK and the Intent object--
		setResult(RESULT_OK,i);
		
		//--destroy the current activity--
		finish();
	}
}

package com.example.passingdata;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Toast;
public class MainActivity extends Activity {
	@Override
	protected void onCreate(Bundle savedInstanceState){
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
	}
	public void onClick(View v){
		Intent i=new Intent("learn.PassingData.SecondActivity");
		
		//--use putExtra() to add new name/value pairs--
		i.putExtra("str1", "this is a string");
		i.putExtra("age1", 25);
		
		//--use a Bundle object to add new name/value pairs--
		Bundle b=new Bundle();
		b.putString("str2", "this is another string");
		b.putInt("age2", 35);
		
		//--attach the Bundle object to the Intent object--
		i.putExtras(b);
		
		//--start activity to get a result back--
		startActivityForResult(i,1);
	}
	public void onActivityResult(int requestCode,int resultCode, Intent data){
		
		//--check if the request code id 1--
		if(requestCode == 1){
			
			//-- if the result is OK--
			if(resultCode == RESULT_OK){
				
				//--get the result using getIntExtra()--
				Toast.makeText(this, Integer.toString(data.getIntExtra("age3", 0)),
				Toast.LENGTH_SHORT).show();
				
				//--get the result using getData()--
				Toast.makeText(this, data.getData().toString(), Toast.LENGTH_SHORT).show();
			}
		}
	}
}

<activity
	android:name=".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:label="Second Activity"
	android:name=".SecondActivity">
	<intent-filter>
		<action android:name="learn.PassingData.SecondActivity" />
		<category android:name="android.intent.category.DEFAULT" />
	</intent-filter>
</activity>

//--use putExtra() to add new name/value pairs--
i.putExtra("str1", "this is a string");
i.putExtra("age1", 25);

//--use a Bundle object to add new name/value pairs--
Bundle b=new Bundle();
b.putString("str2", "this is another string");
b.putInt("age2", 35);

//--attach the Bundle object to the Intent object--
i.putExtras(b);

//--get the data passed in using getIntExtra--
Toast.makeText(this, Integer.toString(getIntent().getIntExtra("age1", 0)),
Toast.LENGTH_SHORT).show();

//--get the Bundle passed in--
Bundle b = getIntent().getExtras();

//--use the setData() method to return some value--
i.setData(Uri.parse("something passed back to main activity"));

//--get the result using getData()--
Toast.makeText(this, data.getData().toString(), Toast.LENGTH_SHORT).show();