安卓Banner实现轮播图

来源：互联网发布：淘宝运营多少人编辑：程序博客网时间：2024/06/08 13:48

效果图
这里写图片描述

一.配置权限

<uses-permission android:name="android.permission.INTERNET" /><uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /><uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" /><uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" /><uses-permission android:name="android.permission.ACCESS_WIFI_STATE" /><uses-permission android:name="android.permission.READ_PHONE_STATE" /><uses-permission android:name="android.permission.CAMERA" /><uses-permission android:name="android.permission.VIBRATE" />

二.导入依赖包

compile 'com.squareup.okio:okio:1.5.0'compile 'com.squareup.okhttp3:okhttp:3.2.0'compile 'com.squareup.okhttp3:logging-interceptor:3.4.1'compile 'com.google.code.gson:gson:2.8.2'compile 'com.youth.banner:banner:1.4.9'compile 'com.github.bumptech.glide:glide:3.7.0'

三.进行写代码
3.1 activity_main.XML

    <com.youth.banner.Banner        android:id="@+id/mybanner"        android:layout_width="match_parent"        android:layout_height="150dp">    </com.youth.banner.Banner>

3.2 创建一个GlideImageLoader 图片加载类

public class GlideImageLoader extends ImageLoader {    @Override    public void displayImage(Context context, Object path, ImageView imageView) {        Glide.with(context).load(path).into(imageView);    }}

3.3 创建MyApp类

public class MyApp extends Application {    public static MyApp mInstance;    @Override    public void onCreate() {        super.onCreate();        mInstance = this;    }    public static MyApp getInstance() {        return mInstance;    }}

3.4 创建utils工具包里边放工具类
这里写图片描述
3.4.1 GsonArrayCallback

import android.os.Handler;import com.google.gson.Gson;import com.google.gson.JsonArray;import com.google.gson.JsonElement;import com.google.gson.JsonParser;import java.io.IOException;import java.lang.reflect.ParameterizedType;import java.lang.reflect.Type;import java.util.ArrayList;import java.util.List;import okhttp3.Call;import okhttp3.Callback;import okhttp3.Response;/** * 1. 类的用途 如果要将得到的json直接转化为集合 建议使用该类 * 该类的onUi() onFailed()方法运行在主线程 */public abstract class GsonArrayCallback<T> implements Callback {    private Handler handler = OkHttp3Utils.getInstance().getHandler();    //主线程处理    public abstract void onUi(List<T> list);    //主线程处理    public abstract void onFailed(Call call, IOException e);    //请求失败    @Override    public void onFailure(final Call call, final IOException e) {        handler.post(new Runnable() {            @Override            public void run() {                onFailed(call, e);            }        });    }    //请求json 并直接返回集合 主线程处理    @Override    public void onResponse(Call call, Response response) throws IOException {        final List<T> mList = new ArrayList<T>();        String json = response.body().string();        JsonArray array = new JsonParser().parse(json).getAsJsonArray();        Gson gson = new Gson();        Class<T> cls = null;        Class clz = this.getClass();        ParameterizedType type = (ParameterizedType) clz.getGenericSuperclass();        Type[] types = type.getActualTypeArguments();        cls = (Class<T>) types[0];        for(final JsonElement elem : array){            //循环遍历把对象添加到集合            mList.add((T) gson.fromJson(elem, cls));        }            handler.post(new Runnable() {                @Override                public void run() {                    onUi(mList);                }            });    }}

3.4.2 GsonObjectCallback

import android.os.Handler;import com.google.gson.Gson;import java.io.IOException;import java.lang.reflect.ParameterizedType;import java.lang.reflect.Type;import okhttp3.Call;import okhttp3.Callback;import okhttp3.Response;/** * 1. 类的用途 如果要将得到的json直接转化为集合 建议使用该类 * 该类的onUi() onFailed()方法运行在主线程 */public abstract class GsonObjectCallback<T> implements Callback {    private Handler handler = OkHttp3Utils.getInstance().getHandler();    //主线程处理    public abstract void onUi(T t);    //主线程处理    public abstract void onFailed(Call call, IOException e);    //请求失败    @Override    public void onFailure(final Call call, final IOException e) {        handler.post(new Runnable() {            @Override            public void run() {                onFailed(call, e);            }        });    }    //请求json 并直接返回泛型的对象 主线程处理    @Override    public void onResponse(Call call, Response response) throws IOException {        String json = response.body().string();        Class<T> cls = null;        Class clz = this.getClass();        ParameterizedType type = (ParameterizedType) clz.getGenericSuperclass();        Type[] types = type.getActualTypeArguments();        cls = (Class<T>) types[0];        Gson gson = new Gson();        final T t = gson.fromJson(json, cls);        handler.post(new Runnable() {            @Override            public void run() {            onUi(t);            }        });    }}

3.4.3 NetWorkUtils

import android.content.Context;import android.net.ConnectivityManager;import android.net.NetworkInfo;/** * 1. 类的用途 联网判断 */public class NetWorkUtils {    //判断网络是否连接    public static boolean isNetWorkAvailable(Context context) {        //网络连接管理器        ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);        //网络信息        NetworkInfo info = connectivityManager.getActiveNetworkInfo();        if (info != null) {            return true;        }        return false;    }}

3.4.4 OkHttp3Utils

import android.content.Context;import android.content.Intent;import android.net.Uri;import android.os.Environment;import android.os.Handler;import android.util.Log;import com.bwie.test.app.MyApp;import java.io.File;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStream;import java.util.Map;import java.util.concurrent.TimeUnit;import okhttp3.Cache;import okhttp3.CacheControl;import okhttp3.Call;import okhttp3.Callback;import okhttp3.FormBody;import okhttp3.Interceptor;import okhttp3.MediaType;import okhttp3.MultipartBody;import okhttp3.OkHttpClient;import okhttp3.Request;import okhttp3.RequestBody;import okhttp3.Response;import okhttp3.logging.HttpLoggingInterceptor;/** * 1. 类的用途 封装OkHttp3的工具类 用单例设计模式 */public class OkHttp3Utils {    /**     * 懒汉 安全 加同步     * 私有的静态成员变量 只声明不创建     * 私有的构造方法     * 提供返回实例的静态方法     */    private static OkHttp3Utils okHttp3Utils = null;    private OkHttp3Utils() {    }    public static OkHttp3Utils getInstance() {        if (okHttp3Utils == null) {            //加同步安全            synchronized (OkHttp3Utils.class) {                if (okHttp3Utils == null) {                    okHttp3Utils = new OkHttp3Utils();                }            }        }        return okHttp3Utils;    }    private static OkHttpClient okHttpClient = null;    public synchronized static OkHttpClient getOkHttpClient() {        if (okHttpClient == null) {            //判空 为空创建实例            // okHttpClient = new OkHttpClient();/** * 和OkHttp2.x有区别的是不能通过OkHttpClient直接设置超时时间和缓存了，而是通过OkHttpClient.Builder来设置， * 通过builder配置好OkHttpClient后用builder.build()来返回OkHttpClient， * 所以我们通常不会调用new OkHttpClient()来得到OkHttpClient，而是通过builder.build()： */            //  File sdcache = getExternalCacheDir();            //缓存目录            File sdcache = new File(Environment.getExternalStorageDirectory(), "cache");            int cacheSize = 10 * 1024 * 1024;            //OkHttp3拦截器            HttpLoggingInterceptor httpLoggingInterceptor = new HttpLoggingInterceptor(new HttpLoggingInterceptor.Logger() {                @Override                public void log(String message) {                    Log.i("xxx", message.toString());                }            });            //Okhttp3的拦截器日志分类 4种            httpLoggingInterceptor.setLevel(HttpLoggingInterceptor.Level.BODY);            okHttpClient = new OkHttpClient.Builder().connectTimeout(15, TimeUnit.SECONDS)                    //添加OkHttp3的拦截器                    .addInterceptor(httpLoggingInterceptor)                    .addNetworkInterceptor(new CacheInterceptor())                    .writeTimeout(20, TimeUnit.SECONDS).readTimeout(20, TimeUnit.SECONDS)                    .cache(new Cache(sdcache.getAbsoluteFile(), cacheSize))                    .build();        }        return okHttpClient;    }    private static Handler mHandler = null;    public synchronized static Handler getHandler() {        if (mHandler == null) {            mHandler = new Handler();        }        return mHandler;    }    /**     * get请求     * 参数1 url     * 参数2 回调Callback     */    public static void doGet(String url, Callback callback) {        //创建OkHttpClient请求对象        OkHttpClient okHttpClient = getOkHttpClient();        //创建Request        Request request = new Request.Builder().url(url).build();        //得到Call对象        Call call = okHttpClient.newCall(request);        //执行异步请求        call.enqueue(callback);    }    /**     * post请求     * 参数1 url     * 参数2 回调Callback     */    public static void doPost(String url, Map<String, String> params, Callback callback) {        //创建OkHttpClient请求对象        OkHttpClient okHttpClient = getOkHttpClient();        //3.x版本post请求换成FormBody 封装键值对参数        FormBody.Builder builder = new FormBody.Builder();        //遍历集合        for (String key : params.keySet()) {            builder.add(key, params.get(key));        }        //创建Request        Request request = new Request.Builder().url(url).post(builder.build()).build();        Call call = okHttpClient.newCall(request);        call.enqueue(callback);    }    /**     * post请求上传文件     * 参数1 url     * 参数2 回调Callback     */    public static void uploadPic(String url, File file, String fileName) {        //创建OkHttpClient请求对象        OkHttpClient okHttpClient = getOkHttpClient();        //创建RequestBody 封装file参数        RequestBody fileBody = RequestBody.create(MediaType.parse("application/octet-stream"), file);        //创建RequestBody 设置类型等        RequestBody requestBody = new MultipartBody.Builder().setType(MultipartBody.FORM).addFormDataPart("file", fileName, fileBody).build();        //创建Request        Request request = new Request.Builder().url(url).post(requestBody).build();        //得到Call        Call call = okHttpClient.newCall(request);        //执行请求        call.enqueue(new Callback() {            @Override            public void onFailure(Call call, IOException e) {            }            @Override            public void onResponse(Call call, Response response) throws IOException {                //上传成功回调 目前不需要处理            }        });    }    /**     * Post请求发送JSON数据     * 参数一：请求Url     * 参数二：请求的JSON     * 参数三：请求回调     */    public static void doPostJson(String url, String jsonParams, Callback callback) {        RequestBody requestBody = RequestBody.create(MediaType.parse("application/json; charset=utf-8"), jsonParams);        Request request = new Request.Builder().url(url).post(requestBody).build();        Call call = getOkHttpClient().newCall(request);        call.enqueue(callback);    }    /**     * 下载文件 以流的形式把apk写入的指定文件 得到file后进行安装     * 参数一：请求Url     * 参数二：保存文件的路径名     * 参数三：保存文件的文件名     */    public static void download(final Context context, final String url, final String saveDir) {        Request request = new Request.Builder().url(url).build();        Call call = getOkHttpClient().newCall(request);        call.enqueue(new Callback() {            @Override            public void onFailure(Call call, IOException e) {                Log.i("xxx", e.toString());            }            @Override            public void onResponse(Call call, final Response response) throws IOException {                InputStream is = null;                byte[] buf = new byte[2048];                int len = 0;                FileOutputStream fos = null;                try {                    is = response.body().byteStream();                    //apk保存路径                    final String fileDir = isExistDir(saveDir);                    //文件                    File file = new File(fileDir, getNameFromUrl(url));                    fos = new FileOutputStream(file);                    while ((len = is.read(buf)) != -1) {                        fos.write(buf, 0, len);                    }                    fos.flush();                    //apk下载完成后 调用系统的安装方法                    Intent intent = new Intent(Intent.ACTION_VIEW);                    intent.setDataAndType(Uri.fromFile(file), "application/vnd.android.package-archive");                    context.startActivity(intent);                } catch (IOException e) {                    e.printStackTrace();                } finally {                    if (is != null) is.close();                    if (fos != null) fos.close();                }            }        });    }    /**     * @param saveDir     * @return     * @throws IOException 判断下载目录是否存在     */    public static String isExistDir(String saveDir) throws IOException {        // 下载位置        if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {            File downloadFile = new File(Environment.getExternalStorageDirectory(), saveDir);            if (!downloadFile.mkdirs()) {                downloadFile.createNewFile();            }            String savePath = downloadFile.getAbsolutePath();            Log.e("savePath", savePath);            return savePath;        }        return null;    }    /**     * @param url     * @return 从下载连接中解析出文件名     */    private static String getNameFromUrl(String url) {        return url.substring(url.lastIndexOf("/") + 1);    }    /**     * 为okhttp添加缓存，这里是考虑到服务器不支持缓存时，从而让okhttp支持缓存     */    private static class CacheInterceptor implements Interceptor {        @Override        public Response intercept(Chain chain) throws IOException {            // 有网络时 设置缓存超时时间1个小时            int maxAge = 60 * 60;            // 无网络时，设置超时为1天            int maxStale = 60 * 60 * 24;            Request request = chain.request();            if (NetWorkUtils.isNetWorkAvailable(MyApp.getInstance())) {                //有网络时只从网络获取                request = request.newBuilder().cacheControl(CacheControl.FORCE_NETWORK).build();            } else {                //无网络时只从缓存中读取                request = request.newBuilder().cacheControl(CacheControl.FORCE_CACHE).build();               /* Looper.prepare();                Toast.makeText(MyApp.getInstance(), "走拦截器缓存", Toast.LENGTH_SHORT).show();                Looper.loop();*/            }            Response response = chain.proceed(request);            if (NetWorkUtils.isNetWorkAvailable(MyApp.getInstance())) {                response = response.newBuilder()                        .removeHeader("Pragma")                        .header("Cache-Control", "public, max-age=" + maxAge)                        .build();            } else {                response = response.newBuilder()                        .removeHeader("Pragma")                        .header("Cache-Control", "public, only-if-cached, max-stale=" + maxStale)                        .build();            }            return response;        }    }}

3.5 创建bean类封装数据(此处省略)
3.6 MainActivity

import android.os.Bundle;import android.support.v7.app.AppCompatActivity;import com.bwie.test.app.GlideImageLoader;import com.bwie.test.utils.GsonObjectCallback;import com.bwie.test.utils.OkHttp3Utils;import com.youth.banner.Banner;import java.io.IOException;import java.util.ArrayList;import java.util.List;import okhttp3.Call;public class MainActivity extends AppCompatActivity {    List<HomeBean.DataBean.Ad1Bean> ad1;    List mlist=new ArrayList();    String mpath="http://result.eolinker.com/umIPmfS6c83237d9c70c7c9510c9b0f97171a308d13b611?uri=homepage";    Banner  mbanner;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        mbanner= (Banner) findViewById(R.id.mybanner);        GetDate(mpath);    }    private void GetDate(String url){        OkHttp3Utils.getInstance().doGet(url, new GsonObjectCallback<HomeBean>() {            @Override            public void onUi(HomeBean homeBean) {                for(int i=0; i<homeBean.getData().getAd1().size();i++){                    String ad1s = homeBean.getData().getAd1().get(i).getImage();                    mlist.add(ad1s);                }                //设置图片加载器                mbanner.setImageLoader(new GlideImageLoader());                mbanner.setImages(mlist);                mbanner.start();            }            @Override            public void onFailed(Call call, IOException e) {            }        });    }}

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