Android viewpager在最后一页滑动之后跳转到主页面的实例代码
先给大家说下实现思路
主要有是两个监听:
一是addOnPageChangeListener();二是setOnTouchListener();
addOnPageChangeListener()主要是为了获取position(滑动到了第几页)
setOnTouchListener()主要是判断在最后一页中是否向左滑动了,然后进入主页
在没给大家分享代码之前,先给大家展示下效果图:
主要功能代码
addOnPageChangeListener(); viewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() { @Override public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) { } @Override public void onPageSelected(int position) { currentItem = position;//获取位置,即第几页 Log.i("Guide","监听改变"+position); } @Override public void onPageScrollStateChanged(int state) { } }); setOnTouchListener(); viewPager.setOnTouchListener(new View.OnTouchListener() { float startX; float startY;//没有用到 float endX; float endY;//没有用到 @Override public boolean onTouch(View v, MotionEvent event) { switch (event.getAction()){ case MotionEvent.ACTION_DOWN: startX=event.getX(); startY=event.getY(); break; case MotionEvent.ACTION_UP: endX=event.getX(); endY=event.getY(); WindowManager windowManager= (WindowManager) getApplicationContext().getSystemService(Context.WINDOW_SERVICE); //获取屏幕的宽度 Point size = new Point(); windowManager.getDefaultDisplay().getSize(size); int width=size.x; //首先要确定的是,是否到了最后一页,然后判断是否向左滑动,并且滑动距离是否符合,我这里的判断距离是屏幕宽度的4分之一(这里可以适当控制) if(currentItem==(imageViews.size()-1)&&startX-endX>=(width/4)){ Log.i(LOG,"进入了触摸"); goToMainActivity();//进入主页 overridePendingTransition(R.anim.slide_in_right,R.anim.slide_in_left);//这部分代码是切换Activity时的动画,看起来就不会很生硬 } break; } return false; } });
以下是全部代码
GuideActivity package com.tc.mobileshop; import android.content.Context; import android.content.Intent; import android.graphics.Point; import android.support.v4.view.PagerAdapter; import android.support.v4.view.ViewPager; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.util.Log; import android.view.Display; import android.view.MotionEvent; import android.view.View; import android.view.ViewGroup; import android.view.WindowManager; import android.widget.ImageView; import com.tc.mobileshop.utils.DisplayUtils; import java.util.ArrayList; import java.util.List; public class GuideActivity extends AppCompatActivity { private static final String LOG = "GuideActivity"; int touchCount; int currentItem; List<Integer> imageIDList; List<ImageView> imageViews; ViewPager viewPager; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_guide); //初始化引导数据 initGuideData(); //初始化引导页 initGuideView(); //初始化分页控件 iniView(); } /** * 初始化引导页数据 */ private void initGuideData() { imageIDList = new ArrayList(); imageIDList.add(R.mipmap.apk_img1); imageIDList.add(R.mipmap.apk_img2); imageIDList.add(R.mipmap.apk_img3); } /** * 初始化引导页 */ private void initGuideView() { imageViews = new ArrayList<>(); for (int i = 0; i < imageIDList.size(); i++) { imageViews.add(new ImageView(this)); } } /** * 初始化分页控件 */ private void iniView() { viewPager = (ViewPager) findViewById(R.id.guide_pager); viewPager.setAdapter(new GuideAdapter()); viewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() { @Override public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) { } @Override public void onPageSelected(int position) { currentItem = position; Log.i("Guide","监听改变"+position); } @Override public void onPageScrollStateChanged(int state) { } }); viewPager.setOnTouchListener(new View.OnTouchListener() { float startX; float startY; float endX; float endY; @Override public boolean onTouch(View v, MotionEvent event) { switch (event.getAction()){ case MotionEvent.ACTION_DOWN: startX=event.getX(); startY=event.getY(); break; case MotionEvent.ACTION_UP: endX=event.getX(); endY=event.getY(); WindowManager windowManager= (WindowManager) getApplicationContext().getSystemService(Context.WINDOW_SERVICE); //获取屏幕的宽度 Point size = new Point(); windowManager.getDefaultDisplay().getSize(size); int width=size.x; //首先要确定的是,是否到了最后一页,然后判断是否向左滑动,并且滑动距离是否符合,我这里的判断距离是屏幕宽度的4分之一(这里可以适当控制) if(currentItem==(imageViews.size()-1)&&startX-endX>0&&startX-endX>=(width/4)){ Log.i(LOG,"进入了触摸"); goToMainActivity(); overridePendingTransition(R.anim.slide_in_right,R.anim.slide_in_left); } break; } return false; } }); } private void goToMainActivity() { Intent intent=new Intent(this,MainActivity.class); startActivity(intent); finish(); } /** * Viewpager适配器 */ private class GuideAdapter extends PagerAdapter { @Override public int getCount() { return imageViews.size(); } /** * 判断当前分页是不是view * 由于ViewPager里面的分页可以填入Fragment * * @param view * @param object * @return */ @Override public boolean isViewFromObject(View view, Object object) { return view == object; } /** * 清理内存 * 从第一页滑动到第二页,此时第一页的内存应该释放 * * @param container * @param position * @param object */ @Override public void destroyItem(ViewGroup container, int position, Object object) { container.removeView(imageViews.get(position));//释放滑动过后的前一页 } /** * 得到---->暂时是没有用的 * * @param object * @return */ @Override public int getItemPosition(Object object) { return super.getItemPosition(object); } /** * 初始化分页 * * @param container * @param position * @return */ @Override public Object instantiateItem(ViewGroup container, int position) { ImageView imageView = imageViews.get(position); imageView.setImageResource(imageIDList.get(position)); ViewGroup.LayoutParams viewLayoutParams = new ViewGroup.LayoutParams ( DisplayUtils.dip2px(GuideActivity.this, 170), DisplayUtils.dip2px(GuideActivity.this, 200) ); container.addView(imageView,viewLayoutParams);//设置图片的宽高 return imageView; } } }
以下为动画资源代码
slide_in_left.xml
<?xml version="1.0" encoding="utf-8"?> <set xmlns:android="http://schemas.android.com/apk/res/android"> <translate android:duration="1000" android:fromXDelta="0%p" android:toXDelta="-100%" /> </set> slide_in_right.xml <?xml version="1.0" encoding="utf-8"?> <set xmlns:android="http://schemas.android.com/apk/res/android"> <translate android:duration="1000" android:fromXDelta="100%p" android:toXDelta="0" /> </set>
以上所述是小编给大家介绍的Android viewpager在最后一页滑动之后跳转到主页面的实例代码,希望对大家有所帮助,如果大家有任何疑问请给我留言,小编会及时回复大家的。在此也非常感谢大家对我们网站的支持!
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