okHttp日常使用笔记

布满荆棘的人生 2022-09-26 08:29 179阅读 0赞

> 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**

4,github地址：[https://github.com/Androidcaobo/OkhttpTest][https_github.com_Androidcaobo_OkhttpTest]  
宏洋原博客：[http://blog.csdn.net/lmj623565791/article/details/47911083][http_blog.csdn.net_lmj623565791_article_details_47911083]

[https_github.com_Androidcaobo_OkhttpTest]: https://github.com/Androidcaobo/OkhttpTest
[http_blog.csdn.net_lmj623565791_article_details_47911083]: http://blog.csdn.net/lmj623565791/article/details/47911083