圖片輪播在很多app中需要使用到,下面源碼是通過Android ViewPgaer控件實現圖片輪播。
源碼下載:http://download.csdn.net/detail/zouchao911/8308427
效果圖:
1、MainActivity.java文件代碼:
- package com.example.picturecarousel;
- import java.util.ArrayList;
- import java.util.List;
- import java.util.concurrent.Executors;
- import java.util.concurrent.ScheduledExecutorService;
- import java.util.concurrent.TimeUnit;
- import android.os.Bundle;
- import android.os.Handler;
- import android.os.Message;
- import android.app.Activity;
- import android.support.v4.view.PagerAdapter;
- import android.support.v4.view.ViewPager;
- import android.support.v4.view.ViewPager.OnPageChangeListener;
- import android.view.Menu;
- import android.view.MotionEvent;
- import android.view.View;
- import android.view.View.OnTouchListener;
- import android.view.ViewGroup;
- import android.widget.ImageView;
- import android.widget.ImageView.ScaleType;
- import android.widget.LinearLayout;
- import android.widget.ViewFlipper;
- public class MainActivity extends Activity {
- private ViewPager view_pager;
- private LinearLayout ll_dotGroup;
- private int imgResIds[] = new int[] { R.drawable.a, R.drawable.b,
- R.drawable.c, R.drawable.d };
- private int curIndex = 0;
- PicsAdapter picsAdapter;
- @Override
- protected void onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- setContentView(R.layout.activity_main);
- view_pager = (ViewPager) findViewById(R.id.view_pager);
- ll_dotGroup = (LinearLayout) findViewById(R.id.dotgroup);
- picsAdapter = new PicsAdapter(); // 創建適配器
- picsAdapter.setData(imgResIds);
- view_pager.setAdapter(picsAdapter); // 設置適配器
- view_pager.setOnPageChangeListener(new MyPageChangeListener()); //設置頁面切換監聽器
- initPoints(imgResIds.length); // 初始化圖片小圓點
- startAutoScroll(); // 開啓自動播放
- }
- // 初始化圖片輪播的小圓點
- private void initPoints(int count) {
- for (int i = 0; i < count; i++) {
- ImageView iv = new ImageView(this);
- LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(
- 15, 15);
- params.setMargins(0, 0, 20, 0);
- iv.setLayoutParams(params);
- iv.setImageResource(R.drawable.dot1);
- ll_dotGroup.addView(iv);
- }
- ((ImageView) ll_dotGroup.getChildAt(curIndex))
- .setImageResource(R.drawable.dot2);
- }
- // 自動播放
- private void startAutoScroll() {
- ScheduledExecutorService scheduledExecutorService = Executors
- .newSingleThreadScheduledExecutor();
- // 每隔2秒鐘切換一張圖片
- scheduledExecutorService.scheduleWithFixedDelay(new ViewPagerTask(), 2,
- 10, TimeUnit.SECONDS);
- }
- // 切換圖片任務
- private class ViewPagerTask implements Runnable {
- @Override
- public void run() {
- runOnUiThread(new Runnable() {
- @Override
- public void run() {
- int count = picsAdapter.getCount();
- view_pager.setCurrentItem((curIndex + 1) % count);
- }
- });
- }
- }
- // 定義ViewPager控件頁面切換監聽器
- class MyPageChangeListener implements OnPageChangeListener {
- @Override
- public void onPageScrolled(int position, float positionOffset,
- int positionOffsetPixels) {
- }
- @Override
- public void onPageSelected(int position) {
- ImageView imageView1 = (ImageView) ll_dotGroup.getChildAt(position);
- ImageView imageView2 = (ImageView) ll_dotGroup.getChildAt(curIndex);
- if (imageView1 != null) {
- imageView1.setImageResource(R.drawable.dot2);
- }
- if (imageView2 != null) {
- imageView2.setImageResource(R.drawable.dot1);
- }
- curIndex = position;
- }
- boolean b = false;
- @Override
- public void onPageScrollStateChanged(int state) {
- //這段代碼可不加,主要功能是實現切換到末尾後返回到第一張
- switch (state) {
- case 1:// 手勢滑動
- b = false;
- break;
- case 2:// 界面切換中
- b = true;
- break;
- case 0:// 滑動結束,即切換完畢或者加載完畢
- // 當前爲最後一張,此時從右向左滑,則切換到第一張
- if (view_pager.getCurrentItem() == view_pager.getAdapter()
- .getCount() - 1 && !b) {
- view_pager.setCurrentItem(0);
- }
- // 當前爲第一張,此時從左向右滑,則切換到最後一張
- else if (view_pager.getCurrentItem() == 0 && !b) {
- view_pager.setCurrentItem(view_pager.getAdapter()
- .getCount() - 1);
- }
- break;
- default:
- break;
- }
- }
- }
- // 定義ViewPager控件適配器
- class PicsAdapter extends PagerAdapter {
- private List<ImageView> views = new ArrayList<ImageView>();
- @Override
- public int getCount() {
- if (views == null) {
- return 0;
- }
- return views.size();
- }
- public void setData(int[] imgResIds) {
- for (int i = 0; i < imgResIds.length; i++) {
- ImageView iv = new ImageView(MainActivity.this);
- ViewGroup.LayoutParams params = new ViewGroup.LayoutParams(
- ViewGroup.LayoutParams.MATCH_PARENT,
- ViewGroup.LayoutParams.MATCH_PARENT);
- iv.setLayoutParams(params);
- iv.setScaleType(ScaleType.FIT_XY);
- iv.setImageResource(imgResIds[i]);
- views.add(iv);
- }
- }
- public Object getItem(int position) {
- if (position < getCount())
- return views.get(position);
- return null;
- }
- @Override
- public boolean isViewFromObject(View arg0, Object arg1) {
- return arg0 == arg1;
- }
- @Override
- public void destroyItem(View container, int position, Object object) {
- if (position < views.size())
- ((ViewPager) container).removeView(views.get(position));
- }
- @Override
- public int getItemPosition(Object object) {
- return views.indexOf(object);
- }
- @Override
- public Object instantiateItem(View container, int position) {
- if (position < views.size()) {
- final ImageView imageView = views.get(position);
- ((ViewPager) container).addView(imageView);
- return views.get(position);
- }
- return null;
- }
- }
- }
2、主佈局文件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"
- tools:context=".MainActivity" >
- <RelativeLayout
- android:layout_width="match_parent"
- android:layout_height="150dp"
- android:layout_marginBottom="5dp"
- android:orientation="vertical" >
- <android.support.v4.view.ViewPager
- android:id="@+id/view_pager"
- android:layout_width="match_parent"
- android:layout_height="match_parent"
- android:layout_gravity="center" >
- </android.support.v4.view.ViewPager>
- <LinearLayout
- android:id="@+id/dotgroup"
- android:layout_width="match_parent"
- android:layout_height="wrap_content"
- android:layout_alignParentBottom="true"
- android:gravity="center"
- android:layout_marginBottom="15dp"
- android:orientation="horizontal" >
- </LinearLayout>
- </RelativeLayout>
- </RelativeLayout>