package demo.com.viewpagerdemo;
import android.content.Intent;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
 
import java.util.ArrayList;
import java.util.List;
public class MainActivity extends AppCompatActivity implements ViewPager.OnPageChangeListener {

    private ViewPager viewPager;
    private List<MyFragment> fragmentList;
    private MyFragmentAdapter adapter;
    private boolean isPress;//手指是否觸控式螢幕幕
 
private boolean isOpen;//是否開啟下一個activity
@Override
protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
viewPager = (ViewPager) findViewById(R.id.viewPager);
fragmentList = new ArrayList<>();
        for (int i = 1
 
; i < 6; i++) {
            MyFragment fragment = new MyFragment();
fragment.setText("第" + i + "頁");
fragmentList.add(fragment);
}

        adapter = new MyFragmentAdapter(getSupportFragmentManager());
viewPager.setAdapter(adapter);
viewPager.addOnPageChangeListener(this);
}

    @Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
        if (fragmentList.size() - 1 == position && isPress && positionOffsetPixels == 0 && !isOpen) {
            isOpen = true;//防止多次新增activity
Intent intent = new Intent(this, SecondActivity.class);
//            startActivity(intent);
startActivityForResult(intent,1);
}
    }

    @Override
public void onPageSelected(int position) {

    }

    @Override
public void onPageScrollStateChanged(int state) {
        if (state == ViewPager.SCROLL_STATE_DRAGGING) {
            isPress = true;
} else {//必須寫else，不然的話，倒數第二頁就開始自動跳轉了
isPress = false;
}
    }

    class MyFragmentAdapter extends FragmentPagerAdapter {

        public MyFragmentAdapter(FragmentManager fm) {
            super(fm);
}

        @Override
public Fragment getItem(int position) {
            return fragmentList.get(position);
}

        @Override
public int getCount() {
            return fragmentList.size();
}
    }

    @Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
isOpen=false;
}
}