okHttp日常使用笔记

网络框架有很多，Okhttp是比较出名的一个，参考宏洋大神博客，写下自己的笔记，供参考

1.首先gradle，没什么好说的，就是依赖这几个，因为用的是别人封装过的okhttp

compile ‘com.squareup.okhttp:okhttp:2.4.0’
compile ‘com.squareup.okio:okio:1.5.0’
compile ‘com.google.code.gson:gson:2.6.2’

2.Activity中的代码

package com.caobo.okhttptest;import android.app.Activity;import android.os.Bundle;import android.util.Log;import android.widget.TextView;import com.caobo.okhttptest.GsonTest.Person;import com.caobo.okhttptest.okhttpUility.OkHttpClientManager;import com.squareup.okhttp.Request;import java.util.List;/** * 1.以上就是发送一个get请求的步骤，首先构造一个Request对象，参数最起码有个url * 2.然后通过request的对象去构造得到一个Call对象，类似于将你的请求封装成了任务，既然是任务，就会有execute()和cancel()等方法 * 3.最后，我们希望以异步的方式去执行请求，所以我们调用的是call.enqueue，将call加入调度队列，然后等待任务执行完成，我们在Callback中即可得到结果 * 4.每次请求还是比较麻烦的，所以我们自己还是要封装一下 * * eg："http://www.weather.com.cn/data/list3/city.xml" */public class MainActivity extends Activity {    private TextView mTextView;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        mTextView = (TextView) findViewById(R.id.test);        //okHttp发送网络Get请求,注意这里我们指定的是String类型如：.ResultCallback<String>        OkHttpClientManager.getAsyn("http://www.weather.com.cn/data/list3/city.xml", new OkHttpClientManager.ResultCallback<String>() {            @Override            public void onError(Request request, Exception e) {                e.printStackTrace();            }            @Override            public void onResponse(String response) {                //注意这里是Ui线程                //mTextView.setText(response);            }        });        //http://www.imooc.com/api/teacher?type=4&num=30        //整合的Gson,暂时不会用,解析不出来        OkHttpClientManager.getAsyn("http://www.imooc.com/api/teacher?type=4&num=30",                new OkHttpClientManager.ResultCallback<List<Person>>()                {                    @Override                    public void onError(Request request, Exception e)                    {                        e.printStackTrace();                    }                    @Override                    public void onResponse(List<Person> us)                    {                        Log.e("TAG", us.size() + "");                        mTextView.setText(us.get(1).getMsg());                    }                });    }}

3.封装类，直接贴代码
这个是处理图片用的，目前我没有用的到，只测试了get请求
ImageUtils.java

package com.caobo.okhttptest.okhttpUility;import android.graphics.BitmapFactory;import android.util.DisplayMetrics;import android.view.View;import android.view.ViewGroup;import android.widget.ImageView;import java.io.InputStream;import java.lang.reflect.Field;/** * Created by zhy on 15/11/6. */public class ImageUtils{/**     * 根据InputStream获取图片实际的宽度和高度     *     * @param imageStream     * @return     */    public static ImageSize getImageSize(InputStream imageStream)    {        BitmapFactory.Options options = new BitmapFactory.Options();        options.inJustDecodeBounds = true;        BitmapFactory.decodeStream(imageStream, null, options);        return new ImageSize(options.outWidth, options.outHeight);    }    public static class ImageSize    {        int width;        int height;        public ImageSize()        {        }        public ImageSize(int width, int height)        {            this.width = width;            this.height = height;        }        @Override        public String toString()        {            return "ImageSize{" +                    "width=" + width +                    ", height=" + height +                    '}';        }    }    public static int calculateInSampleSize(ImageSize srcSize, ImageSize targetSize)    {        // 源图片的宽度        int width = srcSize.width;        int height = srcSize.height;        int inSampleSize = 1;        int reqWidth = targetSize.width;        int reqHeight = targetSize.height;        if (width > reqWidth && height > reqHeight)        {            // 计算出实际宽度和目标宽度的比率            int widthRatio = Math.round((float) width / (float) reqWidth);            int heightRatio = Math.round((float) height / (float) reqHeight);            inSampleSize = Math.max(widthRatio, heightRatio);        }        return inSampleSize;    }/**     * 根据ImageView获适当的压缩的宽和高     *     * @param view     * @return     */    public static ImageSize getImageViewSize(View view)    {        ImageSize imageSize = new ImageSize();        imageSize.width = getExpectWidth(view);        imageSize.height = getExpectHeight(view);        return imageSize;    }/**     * 根据view获得期望的高度     *     * @param view     * @return     */    private static int getExpectHeight(View view)    {        int height = 0;        if (view == null) return 0;        final ViewGroup.LayoutParams params = view.getLayoutParams();        //如果是WRAP_CONTENT，此时图片还没加载，getWidth根本无效        if (params != null && params.height != ViewGroup.LayoutParams.WRAP_CONTENT)        {            height = view.getWidth(); // 获得实际的宽度        }        if (height <= 0 && params != null)        {            height = params.height; // 获得布局文件中的声明的宽度        }        if (height <= 0)        {            height = getImageViewFieldValue(view, "mMaxHeight");// 获得设置的最大的宽度        }        //如果宽度还是没有获取到，憋大招，使用屏幕的宽度        if (height <= 0)        {            DisplayMetrics displayMetrics = view.getContext().getResources()                    .getDisplayMetrics();            height = displayMetrics.heightPixels;        }        return height;    }/**     * 根据view获得期望的宽度     *     * @param view     * @return     */    private static int getExpectWidth(View view)    {        int width = 0;        if (view == null) return 0;        final ViewGroup.LayoutParams params = view.getLayoutParams();        //如果是WRAP_CONTENT，此时图片还没加载，getWidth根本无效        if (params != null && params.width != ViewGroup.LayoutParams.WRAP_CONTENT)        {            width = view.getWidth(); // 获得实际的宽度        }        if (width <= 0 && params != null)        {            width = params.width; // 获得布局文件中的声明的宽度        }        if (width <= 0)        {            width = getImageViewFieldValue(view, "mMaxWidth");// 获得设置的最大的宽度        }        //如果宽度还是没有获取到，憋大招，使用屏幕的宽度        if (width <= 0)        {            DisplayMetrics displayMetrics = view.getContext().getResources()                    .getDisplayMetrics();            width = displayMetrics.widthPixels;        }        return width;    }/**     * 通过反射获取imageview的某个属性值     *     * @param object     * @param fieldName     * @return     */    private static int getImageViewFieldValue(Object object, String fieldName)    {        int value = 0;        try        {            Field field = ImageView.class.getDeclaredField(fieldName);            field.setAccessible(true);            int fieldValue = field.getInt(object);            if (fieldValue > 0 && fieldValue < Integer.MAX_VALUE)            {                value = fieldValue;            }        } catch (Exception e)        {        }        return value;    }}

OkHttpClientManager.java

package com.caobo.okhttptest.okhttpUility;import android.graphics.BitmapFactory;import android.util.DisplayMetrics;import android.view.View;import android.view.ViewGroup;import android.widget.ImageView;import java.io.InputStream;import java.lang.reflect.Field;/** * Created by zhy on 15/11/6. */public class ImageUtils{/**     * 根据InputStream获取图片实际的宽度和高度     *     * @param imageStream     * @return     */    public static ImageSize getImageSize(InputStream imageStream)    {        BitmapFactory.Options options = new BitmapFactory.Options();        options.inJustDecodeBounds = true;        BitmapFactory.decodeStream(imageStream, null, options);        return new ImageSize(options.outWidth, options.outHeight);    }    public static class ImageSize    {        int width;        int height;        public ImageSize()        {        }        public ImageSize(int width, int height)        {            this.width = width;            this.height = height;        }        @Override        public String toString()        {            return "ImageSize{" +                    "width=" + width +                    ", height=" + height +                    '}';        }    }    public static int calculateInSampleSize(ImageSize srcSize, ImageSize targetSize)    {        // 源图片的宽度        int width = srcSize.width;        int height = srcSize.height;        int inSampleSize = 1;        int reqWidth = targetSize.width;        int reqHeight = targetSize.height;        if (width > reqWidth && height > reqHeight)        {            // 计算出实际宽度和目标宽度的比率            int widthRatio = Math.round((float) width / (float) reqWidth);            int heightRatio = Math.round((float) height / (float) reqHeight);            inSampleSize = Math.max(widthRatio, heightRatio);        }        return inSampleSize;    }/**     * 根据ImageView获适当的压缩的宽和高     *     * @param view     * @return     */    public static ImageSize getImageViewSize(View view)    {        ImageSize imageSize = new ImageSize();        imageSize.width = getExpectWidth(view);        imageSize.height = getExpectHeight(view);        return imageSize;    }/**     * 根据view获得期望的高度     *     * @param view     * @return     */    private static int getExpectHeight(View view)    {        int height = 0;        if (view == null) return 0;        final ViewGroup.LayoutParams params = view.getLayoutParams();        //如果是WRAP_CONTENT，此时图片还没加载，getWidth根本无效        if (params != null && params.height != ViewGroup.LayoutParams.WRAP_CONTENT)        {            height = view.getWidth(); // 获得实际的宽度        }        if (height <= 0 && params != null)        {            height = params.height; // 获得布局文件中的声明的宽度        }        if (height <= 0)        {            height = getImageViewFieldValue(view, "mMaxHeight");// 获得设置的最大的宽度        }        //如果宽度还是没有获取到，憋大招，使用屏幕的宽度        if (height <= 0)        {            DisplayMetrics displayMetrics = view.getContext().getResources()                    .getDisplayMetrics();            height = displayMetrics.heightPixels;        }        return height;    }/**     * 根据view获得期望的宽度     *     * @param view     * @return     */    private static int getExpectWidth(View view)    {        int width = 0;        if (view == null) return 0;        final ViewGroup.LayoutParams params = view.getLayoutParams();        //如果是WRAP_CONTENT，此时图片还没加载，getWidth根本无效        if (params != null && params.width != ViewGroup.LayoutParams.WRAP_CONTENT)        {            width = view.getWidth(); // 获得实际的宽度        }        if (width <= 0 && params != null)        {            width = params.width; // 获得布局文件中的声明的宽度        }        if (width <= 0)        {            width = getImageViewFieldValue(view, "mMaxWidth");// 获得设置的最大的宽度        }        //如果宽度还是没有获取到，憋大招，使用屏幕的宽度        if (width <= 0)        {            DisplayMetrics displayMetrics = view.getContext().getResources()                    .getDisplayMetrics();            width = displayMetrics.widthPixels;        }        return width;    }/**     * 通过反射获取imageview的某个属性值     *     * @param object     * @param fieldName     * @return     */    private static int getImageViewFieldValue(Object object, String fieldName)    {        int value = 0;        try        {            Field field = ImageView.class.getDeclaredField(fieldName);            field.setAccessible(true);            int fieldValue = field.getInt(object);            if (fieldValue > 0 && fieldValue < Integer.MAX_VALUE)            {                value = fieldValue;            }        } catch (Exception e)        {        }        return value;    }}

4,github地址：https://github.com/Androidcaobo/OkhttpTest
宏洋原博客：http://blog.csdn.net/lmj623565791/article/details/47911083