ViewPager循环显示

 

好久没有写博客了，今天加一个ViewPager页面的循环显示，添加了一个删除页面的小按钮：

 

MainActivity.java

 

package com.yt.viewpagerlooper;

import java.util.ArrayList;
import java.util.List;

import android.os.Bundle;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v4.view.ViewPager.OnPageChangeListener;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;
import android.app.Activity;

public class MainActivity extends Activity {

	String[] strs = new String[] { "1", "2", "3", "4", "5", "6"};
	int[] resIds = new int[]{R.drawable.step1,R.drawable.step2,R.drawable.step3,R.drawable.step4,R.drawable.step5,R.drawable.step6};
	List<String> titles = new ArrayList<String>();
	List<Integer> resIDs = new ArrayList<Integer>();
	private ViewPager viewPager;
	private int curPage = 0;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		for(int i=0; i<strs.length; i++){
			resIDs.add(resIds[i]);
			titles.add(strs[i]);
		}
		
		viewPager = (ViewPager) findViewById(R.id.viewPager);
		MyPagerAdapter adapter = new MyPagerAdapter();
		viewPager.setAdapter(adapter);
		viewPager.setOnPageChangeListener(new MyPageChage());
		Button btn = (Button) findViewById(R.id.btn);
		btn.setOnClickListener(new OnClickListener() {	
			@Override
			public void onClick(View v) {
				titles.remove(curPage);
				resIDs.remove(curPage);
				System.out.println("删除：" + curPage);
				viewPager.getAdapter().notifyDataSetChanged();
			}
		});
	}
	
	
	@Override
	public boolean onTouchEvent(MotionEvent event) {
		System.out.println(event.getX() + " Activity");
		return super.onTouchEvent(event);
	}

	class MyPageChage implements OnPageChangeListener {

		@Override
		public void onPageScrollStateChanged(int arg0) {

		}

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

		}

		@Override
		public void onPageSelected(int position) {
			curPage = position % titles.size();
			System.out.println(curPage);
		}

	}

	private boolean isFirst = true;

	class MyPagerAdapter extends PagerAdapter {

		@Override
		public int getCount() {
			return Integer.MAX_VALUE;
		}

		@Override
		public boolean isViewFromObject(View arg0, Object arg1) {
			return arg0 == arg1;
		}

		@Override
		public Object instantiateItem(ViewGroup container, int position) {
			View view = View.inflate(MainActivity.this, R.layout.page_item, null);
			TextView tv = (TextView) view.findViewById(R.id.title);
			ImageView iv = (ImageView) view.findViewById(R.id.iv);
			tv.setText(titles.get(position % titles.size()));
			iv.setImageResource(resIDs.get(position % titles.size()));
			viewPager.addView(view);
			return view;
		}

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

		@Override
		public int getItemPosition(Object object) {
			return PagerAdapter.POSITION_NONE;
		}
		
	}

}

 

布局文件：activity_main.xml

 

<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">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/hello_world" />

    <android.support.v4.view.ViewPager
        android:id="@+id/viewPager"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="#ffff00" />

      <Button
        android:layout_centerHorizontal="true"
        android:layout_alignParentBottom="true"
        android:id="@+id/btn"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="删除一个View" />
    
</RelativeLayout>

 

ViewPager中页面的布局文件：page_item.xml

 

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <TextView
        android:id="@+id/title"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="#66ffffff" />

    <ImageView
        android:id="@+id/iv"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_below="@id/title"
        android:scaleType="fitXY"
        android:src="@drawable/ic_launcher" />

</RelativeLayout>

 

源码下载地址：http://download.csdn.net/detail/yuan936845015/6573023