Android中ViewPage的使用

ViewPage的使用

package com.gfive.help;import java.io.File;import java.util.ArrayList;import java.util.List;import com.gfive.help.tools.Tools;import android.app.Activity;import android.content.Context;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.os.Bundle;import android.os.Environment;import android.os.Parcelable;import android.support.v4.view.PagerAdapter;import android.support.v4.view.ViewPager;import android.support.v4.view.ViewPager.OnPageChangeListener;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.view.Window;import android.view.ViewGroup.LayoutParams;import android.widget.ImageView;import android.widget.Toast;public class ViewPageActivity extends Activity {ViewPager viewPager;ArrayList<View> list;ViewGroup main, group;ImageView imageView;ImageView[] imageViews;private static int c_id = 0;private static final String IMAGE_PATH = "/gfive/images";/** * 图片类型 */public static final String IMAGE_TYPE = "image_type";private String imageType;@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);this.requestWindowFeature(Window.FEATURE_NO_TITLE);if(!Tools.existSDcard(this)){//如果没有内存卡，请绕开finish();}imageType = getIntent().getStringExtra(IMAGE_TYPE);//获取图片类型LayoutInflater inflater = getLayoutInflater();List<Bitmap> lists = getBitmaps();list = new ArrayList<View>();ImageView iv = null;for(int i = 0;i<lists.size();i++){iv = new ImageView(this);iv.setImageBitmap(lists.get(i));list.add(iv);}imageViews = new ImageView[list.size()];ViewGroup main = (ViewGroup) inflater.inflate(R.layout.tutorials_layout, null);ViewGroup group = (ViewGroup) main.findViewById(R.id.viewGroup);viewPager = (ViewPager) main.findViewById(R.id.viewPager);for (int i = 0; i < list.size(); i++) {imageView = new ImageView(ViewPageActivity.this);imageView.setLayoutParams(new LayoutParams(12, 12));imageViews[i] = imageView;if (i == 0) {imageViews[i].setBackgroundResource(R.drawable.guide_dot_white);} else {imageViews[i].setBackgroundResource(R.drawable.guide_dot_black);}group.addView(imageView);}setContentView(main);viewPager.setAdapter(new MyAdapter());viewPager.setOnPageChangeListener(new MyListener());viewPager.setCurrentItem(300);}class MyAdapter extends PagerAdapter {@Overridepublic int getCount() {return Integer.MAX_VALUE;}@Overridepublic boolean isViewFromObject(View arg0, Object arg1) {return arg0 == arg1;}@Overridepublic int getItemPosition(Object object) {return super.getItemPosition(object);}@Overridepublic void destroyItem(View arg0, int arg1, Object arg2) {}@Overridepublic Object instantiateItem(View arg0, int arg1) {try {((ViewPager) arg0).addView(list.get(arg1 % list.size()), 0);} catch (Exception e) {}return list.get(arg1 % list.size());}@Overridepublic void restoreState(Parcelable arg0, ClassLoader arg1) {}@Overridepublic Parcelable saveState() {return null;}@Overridepublic void startUpdate(View arg0) {}@Overridepublic void finishUpdate(View arg0) {}}class MyListener implements OnPageChangeListener {// 当滑动状态改变时调用@Overridepublic void onPageScrollStateChanged(int arg0) {}// 当当前页面被滑动时调用@Overridepublic void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {if(position==list.size()-1){//最后一页是关掉帮助finish();}}// 当新的页面被选中时调用@Overridepublic void onPageSelected(int location) {if (location > 2 && list.size()>0) {location = location % list.size();}c_id = location;for (int i = 0; i < imageViews.length; i++) {imageViews[location].setBackgroundResource(R.drawable.guide_dot_white);if (location != i) {imageViews[i].setBackgroundResource(R.drawable.guide_dot_black);}}}}@Overrideprotected void onDestroy() {finish();super.onDestroy();}/** * 获取手机中的图片集合 * @return */private List<Bitmap> getBitmaps(){int i = 1;List<Bitmap> bitmaps = new ArrayList<Bitmap>();StringBuilder sbPath = new StringBuilder();sbPath.append(Tools.SDCARD_STORAGE_PATH).append(IMAGE_PATH).append(imageType);while(true){File file = new File(sbPath.toString()+("guide_img"+i+".png").toString());if(!file.exists()) break;bitmaps.add(BitmapFactory.decodeFile(sbPath.toString()+("guide_img"+i+".png")));i++;}return bitmaps;}}

　　布局文件：

<?xml version="1.0" encoding="utf-8"?> <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical" > <android.support.v4.view.ViewPager android:id="@+id/viewPager" android:layout_width="fill_parent" android:layout_height="wrap_content" /> <RelativeLayout android:layout_width="fill_parent" android:layout_height="wrap_content" android:orientation="vertical" > <LinearLayout android:id="@+id/viewGroup" android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_alignParentBottom="true" android:layout_marginBottom="30dp" android:gravity="center_horizontal" android:orientation="horizontal" /> </RelativeLayout> </FrameLayout>

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