Android 图片轮播（最简单的）
布局文件
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" > <FrameLayout android:layout_width="match_parent" android:layout_height="300dip" > <android.support.v4.view.ViewPager android:id="@+id/vp" android:layout_width="match_parent" android:layout_height="match_parent" /> <LinearLayout android:layout_width="match_parent" android:layout_height="35dip" android:layout_gravity="bottom" android:background="#33000000" android:gravity="center" android:orientation="vertical" > <TextView android:id="@+id/title" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="图片标题" android:textColor="@android:color/white" /> <LinearLayout android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginTop="3dip" android:orientation="horizontal" > <View android:id="@+id/dot_0" android:layout_width="5dip" android:layout_height="5dip" android:layout_marginLeft="2dip" android:layout_marginRight="2dip" android:background="@drawable/dot_yes"/> <View android:id="@+id/dot_1" android:layout_width="5dip" android:layout_height="5dip" android:layout_marginLeft="2dip" android:layout_marginRight="2dip" android:background="@drawable/dot_no"/> <View android:id="@+id/dot_2" android:layout_width="5dip" android:layout_height="5dip" android:layout_marginLeft="2dip" android:layout_marginRight="2dip" android:background="@drawable/dot_no"/> <View android:id="@+id/dot_3" android:layout_width="5dip" android:layout_height="5dip" android:layout_marginLeft="2dip" android:layout_marginRight="2dip" android:background="@drawable/dot_no"/> <View android:id="@+id/dot_4" android:layout_width="5dip" android:layout_height="5dip" android:layout_marginLeft="2dip" android:layout_marginRight="2dip" android:background="@drawable/dot_no"/> </LinearLayout> </LinearLayout> </FrameLayout> </RelativeLayout>
在一个fragment中使用
package com.example.administrator.yunphone.View; import android.app.Fragment; import android.os.Bundle; import android.os.Handler; import android.support.annotation.Nullable; import android.support.v4.view.PagerAdapter; import android.support.v4.view.ViewPager; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.ImageView; import android.widget.TextView; import com.example.administrator.yunphone.R; import java.util.ArrayList; import java.util.List; import java.util.concurrent.Executors; import java.util.concurrent.ScheduledExecutorService; import java.util.concurrent.TimeUnit; /** * Created by Administrator on 2016/7/13. */ public class HomeFragment extends Fragment { private View mView; private ViewPager mViewPaper; private List<ImageView> images; private List<View> dots; private int currentItem; //记录上一次点的位置 private int oldPosition = 0; //存放图片的id private int[] imageIds = new int[]{ R.drawable.home_bg, R.drawable.home_bg, R.drawable.home_bg, R.drawable.home_bg, R.drawable.home_bg }; //存放图片的标题 private String[] titles = new String[]{ "轮播1", "轮播2", "轮播3", "轮播4", "轮播5" }; private TextView title; private ViewPagerAdapter adapter; private ScheduledExecutorService scheduledExecutorService; @Nullable @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { mView=inflater.inflate(R.layout.fragment_home_layout, null); setView(); return mView; } private void setView(){ mViewPaper = (ViewPager)mView.findViewById(R.id.vp); //显示的图片 images = new ArrayList<ImageView>(); for(int i = 0; i < imageIds.length; i++){ ImageView imageView = new ImageView(getActivity()); imageView.setBackgroundResource(imageIds[i]); images.add(imageView); } //显示的小点 dots = new ArrayList<View>(); dots.add(mView.findViewById(R.id.dot_0)); dots.add(mView.findViewById(R.id.dot_1)); dots.add(mView.findViewById(R.id.dot_2)); dots.add(mView.findViewById(R.id.dot_3)); dots.add(mView.findViewById(R.id.dot_4)); title = (TextView) mView.findViewById(R.id.title); title.setText(titles[0]); adapter = new ViewPagerAdapter(); mViewPaper.setAdapter(adapter); mViewPaper.setOnPageChangeListener(new ViewPager.OnPageChangeListener() { @Override public void onPageSelected(int position) { title.setText(titles[position]); dots.get(position).setBackgroundResource(R.drawable.dot_yes); dots.get(oldPosition).setBackgroundResource(R.drawable.dot_no); oldPosition = position; currentItem = position; } @Override public void onPageScrolled(int arg0, float arg1, int arg2) { } @Override public void onPageScrollStateChanged(int arg0) { } }); } /*定义的适配器*/ public class ViewPagerAdapter extends PagerAdapter{ @Override public int getCount() { return images.size(); } @Override public boolean isViewFromObject(View arg0, Object arg1) { return arg0 == arg1; } @Override public void destroyItem(ViewGroup view, int position, Object object) { // TODO Auto-generated method stub // super.destroyItem(container, position, object); // view.removeView(view.getChildAt(position)); // view.removeViewAt(position); view.removeView(images.get(position)); } @Override public Object instantiateItem(ViewGroup view, int position) { // TODO Auto-generated method stub view.addView(images.get(position)); return images.get(position); } } /** * 利用线程池定时执行动画轮播 */ @Override public void onStart() { // TODO Auto-generated method stub super.onStart(); scheduledExecutorService = Executors.newSingleThreadScheduledExecutor(); scheduledExecutorService.scheduleWithFixedDelay( new ViewPageTask(), 2, 2, TimeUnit.SECONDS); } /** * 图片轮播任务 * @author liuyazhuang * */ private class ViewPageTask implements Runnable{ @Override public void run() { currentItem = (currentItem + 1) % imageIds.length; mHandler.sendEmptyMessage(0); } } /** * 接收子线程传递过来的数据 */ private Handler mHandler = new Handler(){ public void handleMessage(android.os.Message msg) { mViewPaper.setCurrentItem(currentItem); }; }; @Override public void onStop() { // TODO Auto-generated method stub super.onStop(); if(scheduledExecutorService != null){ scheduledExecutorService.shutdown(); scheduledExecutorService = null; } } }
