ViewPager无限轮播+手动滑动+AsyncTask异步交互机制实例
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我们来讲一个Viewpager无线轮播的实例，这个实例中用到了手动滑动，以及AsyncTask异步交互机制
首先是自动轮播匹配的小圆点的文件，放在drawable中，我们为选中的小圆点文件取名为dot_focus
<?xml version="1.0" encoding="utf-8"?><shape xmlns:android="http://schemas.android.com/apk/res/android" > <corners android:radius="8dp"/> <solid android:color="#59b536"/></shape>未选中状态小圆点文件 dot_normal
<?xml version="1.0" encoding="utf-8"?><shape xmlns:android="http://schemas.android.com/apk/res/android" ><corners android:radius="8dp"/> <solid android:color="#c2c2c2"/></shape>接下来是布局
主页面布局
<LinearLayout 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" android:orientation="vertical" > <RelativeLayout android:layout_width="match_parent" android:layout_height="160dp" > <android.support.v4.view.ViewPager android:id="@+id/main_vp" android:layout_width="match_parent" android:layout_height="160dp" /> <LinearLayout android:id="@+id/main_dots_layout" android:layout_width="match_parent" android:layout_height="wrap_content" android:gravity="center_horizontal" android:layout_alignBottom="@id/main_vp" android:orientation="horizontal" > </LinearLayout> </RelativeLayout> <TableRow android:layout_width="match_parent" android:layout_height="40dp" android:orientation="horizontal" android:layout_marginTop="3dp" > <Button android:id="@+id/main_bt_one" android:layout_width="wrap_content" android:layout_height="wrap_content" android:background="#666666" android:layout_weight="1" android:text="默认" /> <View android:layout_width="0.5dp" android:layout_height="match_parent" android:background="#cccccc" /> <Button android:id="@+id/main_bt_two" android:layout_width="wrap_content" android:layout_height="wrap_content" android:background="#eaeaea" android:layout_weight="1" android:text="销量" /> <View android:layout_width="0.5dp" android:layout_height="match_parent" android:background="#cccccc" /> <Button android:id="@+id/main_bt_three" android:layout_width="wrap_content" android:layout_height="wrap_content" android:background="#eaeaea" android:layout_weight="1" android:text="信誉" /> <View android:layout_width="0.5dp" android:layout_height="match_parent" android:background="#cccccc" /> <Button android:id="@+id/main_bt_four" android:layout_width="wrap_content" android:layout_height="wrap_content" android:background="#eaeaea" android:layout_weight="1" android:text="价格" /> <View android:layout_width="0.5dp" android:layout_height="match_parent" android:background="#cccccc" /> </TableRow> <View android:layout_width="match_parent" android:layout_height="0.5dp" android:background="#cccccc" /> <ListView android:id="@+id/main_lv" android:layout_width="match_parent" android:layout_height="match_parent" /></LinearLayout>listview的信息匹配页面 main_lv_item
<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" > <TableRow android:layout_width="match_parent" android:layout_height="120dp" android:gravity="center_vertical" android:background="#fff" android:orientation="horizontal" > <ImageView android:id="@+id/main_lv_item_iv" android:layout_width="100dp" android:layout_height="120dp" android:src="@drawable/ic_launcher" /> <LinearLayout android:layout_width="match_parent" android:layout_height="120dp" android:layout_marginLeft="5dp" android:orientation="vertical" > <TextView android:id="@+id/main_lv_item_tv_title" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginTop="5dp" android:textSize="16sp" android:text="标题" /> <TextView android:id="@+id/main_lv_item_tv_brand" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginTop="5dp" android:textSize="16sp" android:text="品牌" /> <TextView android:id="@+id/main_lv_item_tv_xiao" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginTop="5dp" android:textSize="16sp" android:text="销量" /> <RelativeLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_marginTop="10dp" > <TextView android:id="@+id/main_lv_item_tv_price" android:layout_width="wrap_content" android:layout_height="wrap_content" android:textColor="#f00" android:textSize="14sp" android:text="价格" /> <TextView android:id="@+id/main_lv_item_tv_good" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentRight="true" android:layout_alignParentTop="true" android:layout_marginRight="14dp" android:text="好评" android:textSize="14sp" /> </RelativeLayout> </LinearLayout> </TableRow> <View android:layout_width="match_parent" android:layout_height="0.5dp" android:background="#ccc" /></LinearLayout>我们这里单独写一个imageloader工具类 ImageLoadUtils，存放加载图片的方法
public class ImageLoadUtils { /* * 初始化ImageLoad配置信息 * (注意在application中初始化这样 就会保证程序一运行就会初始化配置) */ public static void initConfiguation(Context context){ //获取配置对象 Builder configuation = new ImageLoaderConfiguration.Builder(context); //设置内存的缓存的图片大小 configuation.memoryCacheExtraOptions(400, 800) //设置缓存进磁盘的图片大小 .diskCacheExtraOptions(400, 800, null) .writeDebugLogs(); //获取ImageLoader实例初始化环境信息 ImageLoader.getInstance().init(configuation.build()); } /* * 初始化视图选项 */ public static DisplayImageOptions initOptions(){ DisplayImageOptions options = new DisplayImageOptions.Builder() //图片加载是显示的图片 .showImageOnLoading(R.drawable.ic_launcher) //图片加载失败时显示的图片 .showImageOnFail(R.drawable.ic_launcher) //是否缓存进内存 .cacheInMemory(true) //是否缓存进sd卡 .cacheOnDisk(true) .build(); return options; }}写一个MyApplication第三方实现类
public class MyApplication extends Application { @Override public void onCreate() { super.onCreate(); // 初始化ImageLoader并传入全局上下文 ImageLoadUtils.initConfiguation(getApplicationContext()); }}我们接下来写一下listview适配器类MyAdapter和iewpager适配器类MyPagerAdapter
public class MyAdapter extends BaseAdapter{ private Context context; private DisplayImageOptions options; private List<MyItem> list; public MyAdapter(Context context,DisplayImageOptions options, List<MyItem> list) { super(); this.context = context; this.options = options; this.list = list; } @Override public int getCount() { // TODO Auto-generated method stub return list.size(); } @Override public Object getItem(int position) { // TODO Auto-generated method stub return null; } @Override public long getItemId(int position) { // TODO Auto-generated method stub return 0; } @Override public View getView(int position, View convertView, ViewGroup parent) { ViewHolder holder = null; if(convertView == null){ convertView = View.inflate(context, R.layout.main_lv_item, null); holder = new ViewHolder(); //找控件 holder.iv = (ImageView) convertView.findViewById(R.id.main_lv_item_iv); holder.title = (TextView) convertView.findViewById(R.id.main_lv_item_tv_title); holder.brand = (TextView)convertView.findViewById(R.id.main_lv_item_tv_brand); holder.xiao = (TextView)convertView.findViewById(R.id.main_lv_item_tv_xiao); holder.price = (TextView)convertView.findViewById(R.id.main_lv_item_tv_price); holder.good = (TextView)convertView.findViewById(R.id.main_lv_item_tv_good); convertView.setTag(holder); }else{ holder = (ViewHolder) convertView.getTag(); } ImageLoader.getInstance().displayImage(list.get(position).img, holder.iv, options); holder.title.setText(list.get(position).title); holder.brand.setText("品牌:"+list.get(position).brand); holder.xiao.setText("销量:"+list.get(position).salesVolume); holder.price.setText("￥:"+list.get(position).price); holder.good.setText("好评:"+list.get(position).good); return convertView; } class ViewHolder{ ImageView iv; TextView title; TextView brand; TextView xiao; TextView price; TextView good; }}public class MyAdapter extends BaseAdapter{ private Context context; private DisplayImageOptions options; private List<MyItem> list; public MyAdapter(Context context,DisplayImageOptions options, List<MyItem> list) { super(); this.context = context; this.options = options; this.list = list; } @Override public int getCount() { // TODO Auto-generated method stub return list.size(); } @Override public Object getItem(int position) { // TODO Auto-generated method stub return null; } @Override public long getItemId(int position) { // TODO Auto-generated method stub return 0; } @Override public View getView(int position, View convertView, ViewGroup parent) { ViewHolder holder = null; if(convertView == null){ convertView = View.inflate(context, R.layout.main_lv_item, null); holder = new ViewHolder(); //找控件 holder.iv = (ImageView) convertView.findViewById(R.id.main_lv_item_iv); holder.title = (TextView) convertView.findViewById(R.id.main_lv_item_tv_title); holder.brand = (TextView)convertView.findViewById(R.id.main_lv_item_tv_brand); holder.xiao = (TextView)convertView.findViewById(R.id.main_lv_item_tv_xiao); holder.price = (TextView)convertView.findViewById(R.id.main_lv_item_tv_price); holder.good = (TextView)convertView.findViewById(R.id.main_lv_item_tv_good); convertView.setTag(holder); }else{ holder = (ViewHolder) convertView.getTag(); } ImageLoader.getInstance().displayImage(list.get(position).img, holder.iv, options); holder.title.setText(list.get(position).title); holder.brand.setText("品牌:"+list.get(position).brand); holder.xiao.setText("销量:"+list.get(position).salesVolume); holder.price.setText("￥:"+list.get(position).price); holder.good.setText("好评:"+list.get(position).good); return convertView; } class ViewHolder{ ImageView iv; TextView title; TextView brand; TextView xiao; TextView price; TextView good; }}接下来是我们通过这个网址解析到的json数据得到的bean类，这里应该写在工具类之前，原谅我这里疏忽了
public class Bean { public List<MyItem> item; public class MyItem{ public String brand; public String good; public String img; public String salesVolume; public String price; public String title; }}最后使我们的MainActivity的编写
public class MainActivity extends Activity implements OnClickListener { private ViewPager main_vp; private Button main_bt_one; private Button main_bt_two; private Button main_bt_three; private Button main_bt_four; private ListView main_lv; private List<ImageView> dotsLlist; private LinearLayout dots_layout; private List<MyItem> vpimag = new ArrayList<MyItem>(); private List<MyItem> listmr = new ArrayList<MyItem>(); private List<MyItem> listxl = new ArrayList<MyItem>(); private List<MyItem> listxy = new ArrayList<MyItem>(); private List<MyItem> listjg = new ArrayList<MyItem>(); private DisplayImageOptions options; Handler handler = new Handler() { public void handleMessage(android.os.Message msg) { if (msg.what == 1) { int currentItem = main_vp.getCurrentItem(); currentItem++; main_vp.setCurrentItem(currentItem); handler.sendEmptyMessageDelayed(1, 3000); } }; }; private MyAdapter adapter; private Button[] bts; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); //请求去掉窗口title requestWindowFeature(Window.FEATURE_NO_TITLE); setContentView(R.layout.activity_main); // 初始化ImageImageLoader options = ImageLoadUtils.initOptions(); // 找控件 findComp(); // 初始化小圆点 initDots(); // 执行异步请求 MyAsyncTask task = new MyAsyncTask(); task.execute("http://172.17.29.120/localuser/ljy/shoptest/commodity.json"); } /* * 初始化小圆点的方法 */ private void initDots() { // 创建存储小圆点控件的集合 dotsLlist = new ArrayList<ImageView>(); // 在存储集合之前需要清除信息 dotsLlist.clear(); dots_layout.removeAllViews(); for (int i = 0; i < 3; i++) { ImageView img = new ImageView(this); if (i == 0) { img.setImageResource(R.drawable.dots_focus); } else { img.setImageResource(R.drawable.dots_normal); } dotsLlist.add(img); LayoutParams params = new LayoutParams(16, 16); params.setMargins(8, 0, 8, 0); dots_layout.addView(img, params); } } /* * 所需控件 */ private void findComp() { main_vp = (ViewPager) findViewById(R.id.main_vp); dots_layout = (LinearLayout) findViewById(R.id.main_dots_layout); main_bt_one = (Button) findViewById(R.id.main_bt_one); main_bt_two = (Button) findViewById(R.id.main_bt_two); main_bt_three = (Button) findViewById(R.id.main_bt_three); main_bt_four = (Button) findViewById(R.id.main_bt_four); main_lv = (ListView) findViewById(R.id.main_lv); bts = new Button[] {main_bt_one,main_bt_two,main_bt_three,main_bt_four}; // 设置四个按钮的监听并实现onClickListener接口 main_bt_one.setOnClickListener(this); main_bt_two.setOnClickListener(this); main_bt_three.setOnClickListener(this); main_bt_four.setOnClickListener(this); } // 创建异步请求列 class MyAsyncTask extends AsyncTask<String, Void, Bean[]> { @Override protected Bean[] doInBackground(String... params) { Bean[] bean = getNetData(params[0]); return bean; } @Override protected void onPostExecute(Bean[] result) { super.onPostExecute(result); // 设置数据的分配 setData(result); } /* * 数据分配与设置适配器器的方法 */ private void setData(Bean[] result) { // 清除集合数据 vpimag.clear(); listjg.clear(); listmr.clear(); listxl.clear(); listxy.clear(); // 获取对应数据 List<MyItem> img = result[0].item; List<MyItem> mr = result[1].item; List<MyItem> xl = result[2].item; List<MyItem> xy = result[3].item; List<MyItem> jg = result[4].item; // 将解析的数据存储到对应成员集和 vpimag = img; listmr = mr; listxl = xl; listxy = xy; listjg = jg; // 为viewpager设置适配器 MyPagerAdapter myPagerAdapter = new MyPagerAdapter( MainActivity.this, vpimag, options); main_vp.setAdapter(myPagerAdapter); // 为ListView设置适配器 setListAdapter(listmr); // 设置viewpager的监听 setpagerlistener(); handler.sendEmptyMessageDelayed(1, 3000); } /* * viewpager的监听方法 */ private void setpagerlistener() { main_vp.setOnPageChangeListener(new OnPageChangeListener() { @Override public void onPageSelected(int arg0) { for (int i = 0; i < dotsLlist.size(); i++) { if (i == arg0 % dotsLlist.size()) { dotsLlist.get(i).setImageResource( R.drawable.dots_focus); } else { dotsLlist.get(i).setImageResource( R.drawable.dots_normal); } } } @Override public void onPageScrolled(int arg0, float arg1, int arg2) { // TODO Auto-generated method stub } @Override public void onPageScrollStateChanged(int arg0) { // TODO Auto-generated method stub } }); } } // 创建重网络获取数据的方法 public Bean[] getNetData(String path) { try { HttpClient client = new DefaultHttpClient(); // 执行请求 HttpResponse response = client.execute(new HttpGet(path)); int statusCode = response.getStatusLine().getStatusCode(); if (statusCode == 200) { InputStream in = response.getEntity().getContent(); int len = 0; byte[] b = new byte[1024]; ByteArrayOutputStream baos = new ByteArrayOutputStream(); while ((len = in.read(b)) != -1) { baos.write(b, 0, len); } String json = baos.toString("GBK"); // Log.i("HOME", "json:"+json); Gson gson = new Gson(); Bean[] bean = gson.fromJson(json, Bean[].class); return bean; }else{ Toast.makeText(MainActivity.this, "服务器连接失败！", 0).show(); } } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } return null; } /** * 在这里创建适配器方法供按钮调用 */ public void setListAdapter(List<MyItem> item) { adapter = new MyAdapter(MainActivity.this, options, item); main_lv.setAdapter(adapter); } /* * 改变按钮北京的按钮 * 其中颜色在values文件的styles中配置 */ public void updateColor(int arg){ for (int i = 0; i < bts.length; i++) { if(i == arg){ bts[i].setBackgroundResource(R.color.bt_focus); }else{ bts[i].setBackgroundResource(R.color.bt_normal); } } } // 重写按钮的点击方法 @Override public void onClick(View v) { // 获取点击按钮的id int id = v.getId(); switch (id) { case R.id.main_bt_one: setListAdapter(listmr); updateColor(0); break; case R.id.main_bt_two: updateColor(1); setListAdapter(listxl); break; case R.id.main_bt_three: updateColor(2); setListAdapter(listxy); break; case R.id.main_bt_four: updateColor(3); setListAdapter(listjg); break; } }}以上所有就是我的关于viewpager的无限轮播的简单实例，希望可以帮到大家
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