Przykład dla marcino95nod http://forum.android.com.pl/f829/przeja-cia-pomiae-dzy-ekranami-362605/

activity_main.xml

<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/editText1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:ems="10"
        android:inputType="numberSigned" >

        <requestFocus />
    </EditText>

    <EditText
        android:id="@+id/editText2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:ems="10"
        android:inputType="numberSigned" />

    <Button
        android:id="@+id/button1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Activity 2" />

</LinearLayout>

activity_three.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content" >

        <TextView
            android:id="@+id/textView1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentLeft="true"
            android:layout_alignParentTop="true"
            android:text="Medium Text"
            android:textAppearance="?android:attr/textAppearanceMedium" />

        <TextView
            android:id="@+id/textView2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentRight="true"
            android:layout_alignParentTop="true"
            android:text="Medium Text"
            android:textAppearance="?android:attr/textAppearanceMedium" />

        <TextView
            android:id="@+id/textView3"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentTop="true"
            android:layout_centerHorizontal="true"
            android:text="Medium Text"
            android:textAppearance="?android:attr/textAppearanceMedium" />
    </RelativeLayout>

</LinearLayout>

activity_two.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content" >

        <TextView
            android:id="@+id/textView1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentLeft="true"
            android:layout_alignParentTop="true"
            android:text="Medium Text"
            android:textAppearance="?android:attr/textAppearanceMedium" />

        <TextView
            android:id="@+id/textView2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentRight="true"
            android:layout_alignParentTop="true"
            android:text="Medium Text"
            android:textAppearance="?android:attr/textAppearanceMedium" />

    </RelativeLayout>

    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:text="Button" />

    <Button
        android:id="@+id/button2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:text="Button" />

</LinearLayout>

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.intent"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="18" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name" >
        <activity
            android:name="com.example.intent.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.intent.TwoActivity"
            android:label="@string/title_activity_two" >
        </activity>
        <activity
            android:name="com.example.intent.ThreeActivity"
            android:label="@string/title_activity_three" >
        </activity>
    </application>

</manifest>

MainActivity.java

package com.example.intent;

import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;

public class MainActivity extends Activity implements OnClickListener {

	private TextView mTextView1;
	private TextView mTextView2;
	private Button mButton;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		mTextView1 = (TextView) findViewById(R.id.editText1);
		mTextView2 = (TextView) findViewById(R.id.editText2);
		mButton = (Button) findViewById(R.id.button1);
		mButton.setOnClickListener(this);
	}

	@Override
	public void onClick(View v) {
		if (v == mButton) {
			Intent i = new Intent(this, TwoActivity.class);
			i.putExtra(TwoActivity.EXTRA_TEXT_1, mTextView1.getText().toString());
			i.putExtra(TwoActivity.EXTRA_TEXT_2, mTextView2.getText().toString());
			startActivity(i);
		}

	}

}

strings.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>

    <string name="app_name">intent</string>
    <string name="action_settings">Settings</string>
    <string name="hello_world">Hello world!</string>
    <string name="title_activity_two">TwoActivity</string>
    <string name="title_activity_three">MainActivity</string>
    <string name="button1">Groszek</string>
    <string name="button2">Fasolka</string>
    
</resources>

ThreeActivity.java

package com.example.intent;

import android.os.Bundle;
import android.app.Activity;
import android.widget.TextView;

public class ThreeActivity extends Activity {

	public static final String EXTRA_TEXT_1 = "text1";
	public static final String EXTRA_TEXT_2 = "text2";
	public static final String EXTRA_BUTTON = "button";
	public static final int BUTTON_1 = 1;
	public static final int BUTTON_2 = 2;

	private TextView mTextView1;
	private TextView mTextView2;
	private TextView mTextView3;
	private String mText1;
	private String mText2;
	private int mButton;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_three);

		mTextView1 = (TextView) findViewById(R.id.textView1);
		mTextView2 = (TextView) findViewById(R.id.textView2);
		mTextView3 = (TextView) findViewById(R.id.textView3);

		Bundle extra = getIntent().getExtras();
		if (extra.isEmpty())
			finish();

		mText1 = extra.getString(EXTRA_TEXT_1);
		mText2 = extra.getString(EXTRA_TEXT_2);
		mButton = extra.getInt(EXTRA_BUTTON);

		if (mText1 != null)
			mTextView1.setText(mText1);
		if (mText2 != null)
			mTextView2.setText(mText2);

		mTextView3.setText((mButton == 1) ? (R.string.button1) : (R.string.button2));
	}
}

TwoActivity.java

package com.example.intent;

import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;

public class TwoActivity extends Activity implements OnClickListener {
	public static final String EXTRA_TEXT_1 = "text1";
	public static final String EXTRA_TEXT_2 = "text2";

	private TextView mTextView1;
	private TextView mTextView2;
	private Button mButton1;
	private Button mButton2;
	private String mText1;
	private String mText2;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_two);
		mTextView1 = (TextView) findViewById(R.id.textView1);
		mTextView2 = (TextView) findViewById(R.id.textView2);
		mButton1 = (Button) findViewById(R.id.button1);
		mButton1.setOnClickListener(this);
		mButton2 = (Button) findViewById(R.id.button2);
		mButton2.setOnClickListener(this);

		Bundle extra = getIntent().getExtras();
		if (extra.isEmpty())
			finish();

		mText1 = extra.getString(EXTRA_TEXT_1);
		mText2 = extra.getString(EXTRA_TEXT_2);

		if (mText1 != null)
			mTextView1.setText(mText1);
		if (mText2 != null)
			mTextView2.setText(mText2);

	}

	@Override
	public void onClick(View v) {
		if (v == mButton1 || v == mButton2) {
			Intent i = new Intent(this, ThreeActivity.class);
			i.putExtras(getIntent().getExtras());
			if (v == mButton1) {
				i.putExtra(ThreeActivity.EXTRA_BUTTON, ThreeActivity.BUTTON_1);
			} else {
				i.putExtra(ThreeActivity.EXTRA_BUTTON, ThreeActivity.BUTTON_2);
			}
			startActivity(i);
		}

	}
}