从视图分页器开始活动

Question

我是Android编程的新手，我正在使用View Pager和自定义适配器创建简介幻灯片。我有两张简介幻灯片，我希望第三张幻灯片本身是“注册”活动。在我当前的实现中，第三张幻灯片只是活动的布局，而不是活动本身。

您能建议怎么做吗？

这是我的WelcomeActivity.java（我要启动LoginActivity.java）

public class WelcomeActivity extends AppCompatActivity {
Button next;
ViewPager vp;
LinearLayout layoutBars;
MyViewPAdaptor vpAdaptor;
TextView dots[];
int[] layouts;
PrefManager prfManager;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    prfManager = new PrefManager(this);
    if (!prfManager.getIsFirstTimeLaunch()) {
        launchHomeScreen();
        finish();
    }
    setContentView(R.layout.activity_welcome);
    next = (Button) findViewById(R.id.btn_next);
    vp = (ViewPager) findViewById(R.id.view_pager);
    layoutBars = (LinearLayout) findViewById(R.id.layoutDots);
    vpAdaptor = new MyViewPAdaptor();
    layouts = new int[]{
            R.layout.welcome_screen1,
            R.layout.welcome_screen2,
            R.layout.activity_login};
    vp.setAdapter(vpAdaptor);

    // adding bottom dots
    addBottomDots(0);

    // making notification bar transparent
    changeStatusBarColor();

    vp.addOnPageChangeListener(viewPagerPageChangeListener);

    next.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            // checking for last page
            // if last page home screen will be launched
            int current = getItem(+1);
            if (current < layouts.length-1) {
                // move to next screen
                vp.setCurrentItem(current);
            } else {
                launchLoginScreen();
            }
        }
    });
}

private void addBottomDots(int currentPage) {
    dots = new TextView[layouts.length];

    int[] colorsActive = getResources().getIntArray(R.array.array_dot_active);
    int[] colorsInactive = getResources().getIntArray(R.array.array_dot_inactive);

    layoutBars.removeAllViews();
    for (int i = 0; i < dots.length; i++) {
        dots[i] = new TextView(this);
        dots[i].setText(Html.fromHtml("&#8226;"));
        dots[i].setTextSize(35);
        dots[i].setTextColor(colorsInactive[currentPage]);
        layoutBars.addView(dots[i]);
    }

    if (dots.length > 0)
        dots[currentPage].setTextColor(colorsActive[currentPage]);
}

private int getItem(int i) {
    return vp.getCurrentItem() + i;
}

private void launchHomeScreen() {
    prfManager.setFirstTimeLaunch(false);
    startActivity(new Intent(WelcomeActivity.this, MainActivity.class));
    finish();
}
private void launchLoginScreen() {
    prfManager.setFirstTimeLaunch(false);
    startActivity(new Intent(WelcomeActivity.this, LoginActivity.class));
}

//  viewpager change listener
ViewPager.OnPageChangeListener viewPagerPageChangeListener = new ViewPager.OnPageChangeListener() {

    @Override
    public void onPageSelected(int position) {
        addBottomDots(position);

        // changing the next button text 'NEXT' / 'GOT IT'
        if (position == layouts.length - 1) {
            // last page. make button text to GOT IT
            next.setText(getString(R.string.start));
        } else {
            // still pages are left
            next.setText(getString(R.string.next));
        }
    }

    @Override
    public void onPageScrolled(int arg0, float arg1, int arg2) {

    }

    @Override
    public void onPageScrollStateChanged(int arg0) {

    }
};

/**
 * Making notification bar transparent
 */
private void changeStatusBarColor() {
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
        Window window = getWindow();
        window.addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS);
        window.setStatusBarColor(Color.TRANSPARENT);
    }
}

/**
 * View pager adapter
 */
public class MyViewPAdaptor extends PagerAdapter {
    private LayoutInflater layoutInflater;

    public MyViewPAdaptor() {
    }

    @Override
    public Object instantiateItem(ViewGroup container, int position) {
        layoutInflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);

        View view = layoutInflater.inflate(layouts[position], container, false);
        container.addView(view);

        return view;
    }

    @Override
    public int getCount() {
        return layouts.length;
    }

    @Override
    public boolean isViewFromObject(View view, Object obj) {
        return view == obj;
    }


    @Override
    public void destroyItem(ViewGroup container, int position, Object object) {
        View view = (View) object;
        container.removeView(view);
    }
}

}

Answer 1