练习:放入三张图片,使其滑动显示,并在最后一张跳转到另一个界面。
布局:
<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" tools:context=".ViewPagerActivity"> <android.support.v4.view.ViewPager android:layout_width="match_parent" android:layout_height="match_parent" android:id="@+id/vp" android:background="#161616"
> </android.support.v4.view.ViewPager> </RelativeLayout>
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="match_parent" android:layout_height="match_parent"> <ImageView android:layout_width="100dp" android:layout_height="100dp" android:id="@+id/iv" android:src="@mipmap/ic_launcher" android:scaleType="centerCrop" /> <TextView android:layout_width="100dp" android:layout_height="wrap_content" android:id="@+id/tv" android:gravity="center" android:text="测试" /> </LinearLayout>
单个图片效果:图片在上,文字在下。
如图:
代码:
package com.example.administrator.jreduch05; import android.app.Activity; import android.content.Intent; import android.os.Bundle; import android.support.v4.view.PagerAdapter; import android.support.v4.view.ViewPager; import android.view.View; import android.view.ViewGroup; import android.widget.ImageView; import java.util.ArrayList; import java.util.List; public class ViewPagerActivity extends Activity { private ViewPager vp; private List<ImageView> imgList; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_view_pager); vp=(ViewPager) findViewById(R.id.vp); vp.addOnPageChangeListener(new ViewPager.OnPageChangeListener() { @Override public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) { } @Override public void onPageSelected(int position) { if(position==2){ Intent intent=new Intent(ViewPagerActivity.this,zuoe81_2Activity.class); startActivity(intent); finish();
} } @Override public void onPageScrollStateChanged(int state) { } }); imgList=new ArrayList<>(); //将图片放到List中 ImageView img=new ImageView(this); img.setImageResource(R.mipmap.renrou); imgList.add(img); img= new ImageView(this); img.setImageResource(R.mipmap.zhaopian); imgList.add(img); img= new ImageView(this); img.setImageResource(R.mipmap.jietu1); imgList.add(img); vp.setAdapter(new MyViewPagerAdapter(imgList)); } public class MyViewPagerAdapter extends PagerAdapter{ private List<ImageView> imgList; public MyViewPagerAdapter(List<ImageView> imgList){ this.imgList=imgList; } @Override public int getCount() { return imgList.size(); } @Override public boolean isViewFromObject(View view, Object object) { return view==object; } @Override public Object instantiateItem(ViewGroup container, int position) { //往ViewPager里放图片 container.addView(imgList.get(position)); return imgList.get(position); } @Override public void destroyItem(ViewGroup container, int position, Object object) { // container.removeView(imgList.get(position)); } } }