android範例23, 換頁，及回到上一頁

package ex23.MultiActivity;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;

public class MainActivity extends Activity
{

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

    public void gotoSecondActivity(View v)//換到下一頁
    {
        Intent it = new Intent(this, SecondActivity.class); //建立 Intent 並設定目標 Activity
        startActivity(it); // 啟動 Intent 中的目標
    }

}


package ex23.MultiActivity;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;

public class SecondActivity extends Activity
{

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

  public void goBack(View v)//回到上一頁
    {
        finish(); // 結束 Activity, 即可回到前一個 Activity
    }


}