自定义Banner轮播图片

//activity_main

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_main"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.bwie.test.kaoshiti.MainActivity">
    <com.bwie.test.view.CustomBanner
        android:id="@+id/custom_banner"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">
    </com.bwie.test.view.CustomBanner>
    <Button
        android:layout_width="match_parent"
        android:layout_height="50dp"
        android:background="@drawable/btnbg"
        android:text="按钮"/>

</LinearLayout>
      

//activity_details

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.bwie.test.view.DetailsActivity">
    <WebView
        android:id="@+id/webView"
        android:layout_width="match_parent"
        android:layout_height="match_parent">
    </WebView>

</RelativeLayout>
      

//banner_layout

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <android.support.v4.view.ViewPager
        android:id="@+id/banner_view_pager"
        android:layout_width="match_parent"
        android:layout_height="200dp">
    </android.support.v4.view.ViewPager>

    <LinearLayout
        android:id="@+id/linear_bannner"
        android:layout_centerHorizontal="true"
        android:layout_alignBottom="@+id/banner_view_pager"
        android:layout_marginBottom="10dp"
        android:orientation="horizontal"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content">
    </LinearLayout>

</RelativeLayout>
      

drawable文件夹下//btnbg

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle">
    <corners android:radius="20dp"></corners>
    <gradient
        android:startColor="#f00"
        android:endColor="#f89"
        android:angle="45"/>
</shape>      

//shape_01

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
    <!-- 颜色 -->
    <solid android:color="#f89"></solid>
    <!-- 圆角 -->
    <corners android:radius="10dp"></corners>
    <!-- 大小 -->
    <size android:height="10dp" android:width="10dp"></size>
</shape>      

//shape_02

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
    <!-- 颜色 -->
    <solid android:color="#f00"></solid>
    <!-- 圆角 -->
    <corners android:radius="10dp"></corners>
    <!-- 大小 -->
    <size android:height="10dp" android:width="10dp"></size>
</shape>      

//MainActivity

public class MainActivity extends AppCompatActivity {
    private CustomBanner banner;
    List<String> list = new ArrayList<>();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        //需求   实现与banner一样的轮播图
        banner = (CustomBanner) findViewById(R.id.custom_banner);

        //请求数据进行解析展示
        getDataFromNet();
    }

    public void getDataFromNet() {
        OkHttp3Util.doGet("http://120.27.23.105/ad/getAd", new Callback() {
            @Override
            public void onFailure(Call call, IOException e) {

            }

            @Override
            public void onResponse(Call call, Response response) throws IOException {
                if (response.isSuccessful()) {
                    String json = response.body().string();

                    final DetalBean detalBean = new Gson().fromJson(json, DetalBean.class);

                    //因为图片的连接在一起,所以要截断
//                    String[] images = detalBean.getData().getImages().split("\\|");
                    list = new ArrayList<>();

                    for (int i = 0; i < detalBean.getData().size(); i++) {
//                        list.add(images[i]);
                        if (detalBean.getData().get(i).getIcon() != null) {
                            // 图片添加到集合
                            list.add(detalBean.getData().get(i).getIcon());
                        }
                    }

                    runOnUiThread(new Runnable() {
                        @Override
                        public void run() {
                            //设置显示轮播
                            banner.setImageUrls(list);
                            //设置点击事件
                            banner.setClickListner(new CustomBanner.OnClickLisner() {
                                @Override
                                public void onItemClick(int position) {
                                    if (detalBean.getData().get(position).getType() == 0) {
                                        //跳转到详情页面
                                        Intent intent = new Intent(MainActivity.this, DetailsActivity.class);
                                        intent.putExtra("url", detalBean.getData().get(position).getUrl());
                                        startActivity(intent);
                                    } else {
                                        Toast.makeText(MainActivity.this, "点击" + position, Toast.LENGTH_SHORT).show();
                                    }
                                }
                            });
                        }
                    });
                }
            }
        });
    }
}
      

自定义View//DetailsActivity

public class DetailsActivity extends AppCompatActivity {
    private WebView webView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_details);
        webView = (WebView) findViewById(R.id.webView);
        Intent intent = getIntent();
        //接收传过来的值
        String url = intent.getStringExtra("url");
        //加载
        webView.loadUrl(url);//加载网址到视图
        //设置
        webView.setWebViewClient(new WebViewClient());
        WebSettings settings = webView.getSettings();
        settings.setJavaScriptEnabled(true);
        settings.setJavaScriptCanOpenWindowsAutomatically(true);
    }
}
      

//CustomBanner

public class CustomBanner extends FrameLayout {
    private ViewPager viewPager;
    private LinearLayout linearLayout;
    private List<String> list;
    int time = 2;

    //消息接受
    Handler hander = new Handler() {
        @Override
        public void handleMessage(Message msg) {
            super.handleMessage(msg);
            if (msg.what == 0) {
                int currentItem = viewPager.getCurrentItem();
                viewPager.setCurrentItem(currentItem + 1);
                //再次发送
                sendEmptyMessageDelayed(0, time * 1000);
            }
        }
    };
    private ArrayList<ImageView> listDoc;
    private OnClickLisner onClickLisner;

    //创建类时,自动创建了三个构造方法,当调用本类时,都会走构造方法里的方法,也就是初始化
    public CustomBanner(@NonNull Context context) {
        super(context);
        init();
    }

    public CustomBanner(@NonNull Context context, @Nullable AttributeSet attrs) {
        super(context, attrs);
        init();
    }

    public CustomBanner(@NonNull Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        init();
    }

    //初始化方法
    private void init() {
        //找到banner布局
        View view = View.inflate(getContext(), R.layout.banner_layout, this);
        //找到控件
        viewPager = view.findViewById(R.id.banner_view_pager);
        linearLayout = view.findViewById(R.id.linear_bannner);
    }

    /**
     * 对外提供设置image路径的方法
     * 当我调用这个方法的时候,给它传一个集合,集合中装的是要展示的图片
     */
    public void setImageUrls(List<String> list) {
        this.list = list;
        //当集合为空的时候,不至于报错
        if (list == null) {
            return;
        }
        //设置适配器  当我获取到数据的时候,我要让它首先能展示图片,然后在做手动滑动,最后实现无线自动轮播

        LunBoAdapter lunBoAdapter = new LunBoAdapter(getContext(), list);
        viewPager.setAdapter(lunBoAdapter);
        //加载小圆点
        initDoc();
        //显示中间某个位置   就是初始化的时候,可以让他来回翻动
        viewPager.setCurrentItem(list.size() * 10000);
        //使用handler自动轮播
        hander.sendEmptyMessageDelayed(0, time * 1000);

        viewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
            @Override
/*
* 当用手指滑动翻页的时候，如果翻动成功了（滑动的距离够长），
* 手指抬起来就会立即执行这个方法，position就是当前滑动到的页面。如果直接setCurrentItem翻页，那position就和setCurrentItem的参数一致，
* 这种情况在onPageScrolled执行方法前就会立即执行
* */
            public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
                //在选中某一页的时候,切换小圆点的背景
                for (int i = 0; i < listDoc.size(); i++) {
                    if (position % listDoc.size() == i) {
                        listDoc.get(i).setBackgroundResource(R.drawable.shape_01);
                    } else {
                        listDoc.get(i).setBackgroundResource(R.drawable.shape_02);
                    }
                }
            }

            @Override
            public void onPageSelected(int position) {

            }

            @Override
            public void onPageScrollStateChanged(int state) {

            }
        });
    }

    /**
     * 点击事件
     * @param onClickLisner
     */
    public void setClickListner(OnClickLisner onClickLisner) {
        this.onClickLisner = onClickLisner;
    }

    private class LunBoAdapter extends PagerAdapter {
        private List<String> list;
        private Context context;

        public LunBoAdapter(Context context, List<String> list) {
            this.context = context;
            this.list = list;
        }

        //我要重写两个方法,才能实现功能
        @Override
        public int getCount() {
            return Integer.MAX_VALUE;
        }

        @Override
        public boolean isViewFromObject(View view, Object object) {
            return view == object;
        }

        //加载 当页面滑动时,预加载左右两个图片
        @Override
        public Object instantiateItem(ViewGroup container, final int position) {
            //创建imageView
            ImageView imageView = new ImageView(getContext());
            //铺满横屏
            imageView.setScaleType(ImageView.ScaleType.FIT_XY);
            //加载这张图片
            Glide.with(getContext()).load(list.get(position % list.size())).into(imageView);

            //点击事件
            imageView.setOnClickListener(new OnClickListener() {
                @Override
                public void onClick(View view) {
                    //触发
                    onClickLisner.onItemClick(position%list.size());
                }
            });
            //添加到容器
            container.addView(imageView);
            //返回
            return imageView;
        }

        //销毁
        @Override
        public void destroyItem(ViewGroup container, int position, Object object) {
            container.removeView((View) object);
        }
    }

    private void initDoc() {
        //创建一个集合,记录这些小圆点
        listDoc = new ArrayList<ImageView>();
        //清空布局
//        linearLayout.removeAllViews();

        for (int i = 0; i < list.size(); i++) {
            //创建一个图片的占位
            ImageView docImage = new ImageView(getContext());
            if (i == 0) {
                //默认小圆点第一个显示带颜色
                docImage.setBackgroundResource(R.drawable.shape_01);
            } else {
                //其他变成平常的 颜色
                docImage.setBackgroundResource(R.drawable.shape_02);
            }
            //添加到集合   设置完小圆点添加到集合   可能是每次设置完之后都添加再展示
            listDoc.add(docImage);

            //添加到线性布局
            //第一个参数为宽的设置，第二个参数为高的设置。
            //（用的时候注意修改LinearLayout前缀,其实很多时候可以不写它的）
            LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT);
            //设置   设置MarginS  margin与padding  设置边距的
            params.setMargins(5, 0, 5, 0);
            //整个小圆点的父布局添加布局图片的控件    第二个参数是设置位置
            linearLayout.addView(docImage, params);
        }
    }

    //内部接口
    public interface OnClickLisner{
        void onItemClick(int position);
    }
}
      

util文件夹下//OkHttp3Util

public class OkHttp3Util {
    private static OkHttpClient okHttpClient = null;

    private OkHttp3Util() {
    }

    public static OkHttpClient getInstance() {

        if (okHttpClient == null) {
            //加同步安全
            synchronized (OkHttp3Util.class) {
                if (okHttpClient == null) {
                    //okhttp可以缓存数据....指定缓存路径
                    File sdcache = new File(Environment.getExternalStorageDirectory(), "cache");
                    //指定缓存大小
                    int cacheSize = 10 * 1024 * 1024;

                    okHttpClient = new OkHttpClient.Builder()//构建器
                            .connectTimeout(15, TimeUnit.SECONDS)//连接超时
                            .writeTimeout(20, TimeUnit.SECONDS)//写入超时
                            .readTimeout(20, TimeUnit.SECONDS)//读取超时
                            .cache(new Cache(sdcache.getAbsoluteFile(), cacheSize))//设置缓存
                            .build();
                }
            }
        }
        return okHttpClient;
    }

    /**
     * get请求
     * 参数1 url
     * 参数2 回调Callback
     */
    public static void doGet(String oldUrl, Callback callback) {
        //创建OkHttpClient请求对象
        OkHttpClient okHttpClient = getInstance();
        //创建Request
        Request request = new Request.Builder().url(oldUrl).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 Map<String, String> params post请求的时候给服务器传的数据
     *      add..("","")
     *      add()
     */
    public static void doPost(String url, Map<String, String> params, Callback callback) {
        //创建OkHttpClient请求对象
        OkHttpClient okHttpClient = getInstance();
        //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,,,map集合遍历方式
        for (String key : params.keySet()) {
            builder.add(key, params.get(key));

        }
        //创建Request....formBody...new formBody.Builder()...add()....build()
        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....包括图片....流的形式传任意文件...
     * 参数1 url
     * file表示上传的文件
     * fileName....文件的名字,,例如aaa.jpg
     * params ....传递除了file文件 其他的参数放到map集合
     */
    public static void uploadFile(String url, File file, String fileName,Map<String,String> params,Callback callback) {
        //创建OkHttpClient请求对象
        OkHttpClient okHttpClient = getInstance();

        //MultipartBody多功能的请求实体对象,,,formBody只能传表单形式的数据
        MultipartBody.Builder builder = new MultipartBody.Builder();
        builder.setType(MultipartBody.FORM);

        //参数
        if (params != null){
            for (String key : params.keySet()){
                builder.addFormDataPart(key,params.get(key));
            }
        }

        //文件...参数name指的是请求路径中所接受的参数...如果路径接收参数键值是fileeeee,此处应该改变
        builder.addFormDataPart("file",fileName,RequestBody.create(MediaType.parse("application/octet-stream"),file));

        //构建
        MultipartBody multipartBody = builder.build();

        //创建Request
        Request request = new Request.Builder().url(url).post(multipartBody).build();

        //得到Call
        Call call = okHttpClient.newCall(request);
        //执行请求
        call.enqueue(callback);
    }

    /**
     * Post请求发送JSON数据....{"name":"zhangsan","pwd":"123456"}
     * 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 = getInstance().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er：请求Url
     * 参数san：保存文件的文件夹....download
     */
    public static void download(final Activity context, final String url, final String saveDir) {
        Request request = new Request.Builder().url(url).build();
        Call call = getInstance().newCall(request);
        call.enqueue(new Callback() {
            @Override
            public void onFailure(Call call, IOException e) {
                //com.orhanobut.logger.Logger.e(e.getLocalizedMessage());
            }

            @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();//以字节流的形式拿回响应实体内容
                    //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();

                    context.runOnUiThread(new Runnable() {
                        @Override
                        public void run() {
                            Toast.makeText(context, "下载成功:" + fileDir + "," + getNameFromUrl(url), Toast.LENGTH_SHORT).show();
                        }
                    });

                    //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();
                }
            }
        });
    }

    /**
     * 判断下载目录是否存在......并返回绝对路径
     *
     * @param saveDir
     * @return
     * @throws IOException
     */
    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);
    }
}
      

//添加的依赖

compile 'com.google.code.gson:gson:2.8.2'
compile 'com.nostra13.universalimageloader:universal-image-loader:1.9.5'
compile 'com.android.support.test:runner:0.5'
compile 'com.android.support.test.espresso:espresso-core:2.2.2'

compile 'com.squareup.okhttp3:okhttp:3.6.0'
compile 'com.squareup.okio:okio:1.11.0'
compile files('libs/glide-3.7.0.jar')      

//添加的权限

<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"/>