การใช้ Intent เพื่อเปิดหน้า Activity และส่งข้อมูลระหว่าง Activity

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<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
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    android:layout_width="match_parent"
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    android:layout_height="match_parent" >
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    <Button
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        android:id="@+id/button_about"
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        android:layout_width="wrap_content"
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        android:layout_height="wrap_content"
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        android:text="About"
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        android:paddingTop="24dp"
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        android:paddingBottom="24dp"
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        android:paddingLeft="48dp"
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        android:paddingRight="48dp"
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        android:layout_centerVertical="true"
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        android:layout_centerHorizontal="true"/>
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    <ImageView
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        android:layout_width="128dp"
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        android:layout_height="128dp"
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        android:id="@+id/imageView"
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        android:src="@drawable/ic_launcher"
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        android:layout_above="@+id/button_back"
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        android:layout_centerHorizontal="true"/>
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</RelativeLayout>

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<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
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    android:layout_width="match_parent"
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    android:layout_height="match_parent">
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    <TextView
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        android:text="AboutActivity"
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        android:layout_width="wrap_content"
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        android:layout_height="wrap_content"
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        android:textSize="36sp"
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        android:layout_marginTop="32dp"
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        android:layout_alignParentTop="true"
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        android:layout_centerHorizontal="true"/>
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    <Button
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        android:id="@+id/button_back"
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        android:layout_width="wrap_content"
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        android:layout_height="wrap_content"
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        android:text="Back"
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        android:paddingTop="24dp"
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        android:paddingBottom="24dp"
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        android:paddingLeft="48dp"
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        android:paddingRight="48dp"
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        android:layout_centerVertical="true"
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        android:layout_centerHorizontal="true"/>
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</RelativeLayout>

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Intent intent = new Intent(this, AboutActivity.class);
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startActivity(intent);

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package com.devahoy.sample.intent;
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import android.content.Intent;
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import android.os.Bundle;
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import android.support.v7.app.ActionBarActivity;
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import android.view.View;
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import android.widget.Button;
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public class MainActivity extends ActionBarActivity {
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    @Override
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    protected void onCreate(Bundle savedInstanceState) {
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        super.onCreate(savedInstanceState);
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        setContentView(R.layout.activity_main);
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        Button buttonAbout = (Button) findViewById(R.id.button_about);
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        buttonAbout.setOnClickListener(new View.OnClickListener() {
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            @Override
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            public void onClick(View v) {
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                Intent intent = new Intent(MainActivity.this, AboutActivity.class);
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                startActivity(intent);
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            }
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        });
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    }
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}

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Intent intent = new Intent(this, MainActivity.class);
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startActivity(intent);

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package com.devahoy.sample.intent;
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import android.os.Bundle;
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import android.support.v7.app.ActionBarActivity;
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import android.view.View;
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import android.widget.Button;
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public class AboutActivity extends ActionBarActivity {
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    @Override
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    protected void onCreate(Bundle savedInstanceState) {
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        super.onCreate(savedInstanceState);
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        setContentView(R.layout.activity_about);
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        Button buttonBack = (Button) findViewById(R.id.button_back);
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        buttonBack.setOnClickListener(new View.OnClickListener() {
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            @Override
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            public void onClick(View v) {
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                finish();
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            }
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        });
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    }
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}

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Intent intent = new Intent(this, AboutActivity.class);
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startActivity(intent);
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finish();

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Intent intent = new Intent(this, MainActivity.class);
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startActivity(intent);
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finish();

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<activity android:name=".AboutActivity">
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</activity>

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btnSubmit.setOnClickListener(new OnClickListener() {
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    @Override
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    public void onClick(View v) {
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        Intent intent = new Intent(this, AboutActivity.class);
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        startActivity(intent);
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    }
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});

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btnSubmit.setOnClickListener(new OnClickListener() {
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    @Override
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    public void onClick(View v) {
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        Intent intent = new Intent(MainActivity.this, AboutActivity.class);
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        //หรือแบบนี้
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        //Intent intent = new Intent(getApplicationContext(), AboutActivity.class);
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        startActivity(intent);
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    }
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});

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public class YourClass extends Activity {
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    private Context mContext;
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    @Override
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    protected void onCreate(Bundle savedInstanceState) {
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        mContext = getApplicationContext();
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    }
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}

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Intent intent = new Intent(getActivity(), AboutActivity.class);
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startActivity(intent);

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Intent intent = new Intent(this, AboutActivity.class);
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intent.putExtra("name", "devahoy");
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intent.putExtra("isSmart", true);
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intent.putExtra("star", 5);
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startActivity(intent);

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Bundle bundle = getIntent().getExtras();
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if (bundle != null) {
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    String name = bundle.getString("name");
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    int star = bundle.getInt("star");
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    boolean isSmart = bundle.getBoolean("smart");
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    String result = String.format("Name is %s, star : %s, smart : %s",
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            name, star, isSmart);
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    Toast.makeText(this, "Name : " + result, Toast.LENGTH_SHORT).show();
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}