引用开源框架通过AsyncHttpClient实现网络图片查看器

步骤：

1.添加权限（访问网络权限）

2.创建异步请求对象

3.执行post请求（指定url路径，新建AsyncHttpResponseHandler方法）

a) 如果成功创建工厂对象

b) 工厂对象的decodeByteArray把字节转换成Bitmap对象

c) 设置图片

 

实例项目解析

项目要求：通过editText文本输入框中的网址，点击查看按钮，进行网络图片显示

运行效果如下：

    

 

重点代码：均有详细解析，请认真查看注释

1、在AndroidManifest.xml中添加权限

    <uses-permission android:name="android.permission.INTERNET"/>

 

2、布局文件activity_main.xml

 

 package com.example.photowatch;

 import org.apache.http.Header;

 import android.app.Activity;
 import android.graphics.Bitmap;
 import android.graphics.BitmapFactory;
 import android.os.Bundle;
 import android.view.View;
 import android.widget.EditText;
 import android.widget.ImageView;

 import com.loopj.android.http.AsyncHttpClient;
 import com.loopj.android.http.AsyncHttpResponseHandler;

 public class MainActivity extends Activity {

     private EditText et_url;
     private ImageView img_info;

     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
         // 获取控件对象

         et_url = (EditText) findViewById(R.id.et_url);
         img_info = (ImageView) findViewById(R.id.img_info);
     };

     public void show(View v) {

         int id = v.getId();
         switch (id) {
         case R.id.btn_show:
             //请求地址
             String url = et_url.getText().toString();
             //创建网络请求对象
             AsyncHttpClient client= new AsyncHttpClient();
              client.get(url, new AsyncHttpResponseHandler() {
                 @Override
                 public void onSuccess(int statusCode, Header[] headers, byte[] responseBody) {
                     if (statusCode == 200) {
                         //创建工厂对象
                         BitmapFactory bitmapFactory = new BitmapFactory();
                         //工厂对象的decodeByteArray把字节转换成Bitmap对象
                         Bitmap bitmap = bitmapFactory.decodeByteArray(responseBody, 0, responseBody.length);
                         //设置图片
                         img_info.setImageBitmap(bitmap);
                     }
                 }

                 @Override
                 public void onFailure(int statusCode, Header[] headers,
                         byte[] responseBody, Throwable error) {
                     error.printStackTrace();
                 }
             });
             break;

         default:
             break;
         }

     }

 }

3、MainActivity.java

 package com.example.photowatch;

 import org.apache.http.Header;

 import android.app.Activity;
 import android.graphics.Bitmap;
 import android.graphics.BitmapFactory;
 import android.os.Bundle;
 import android.view.View;
 import android.widget.EditText;
 import android.widget.ImageView;

 import com.loopj.android.http.AsyncHttpClient;
 import com.loopj.android.http.AsyncHttpResponseHandler;

 public class MainActivity extends Activity {

     private EditText et_url;
     private ImageView img_info;

     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
         // 获取控件对象

         et_url = (EditText) findViewById(R.id.et_url);
         img_info = (ImageView) findViewById(R.id.img_info);
     };

     public void show(View v) {

         int id = v.getId();
         switch (id) {
         case R.id.btn_show:
             //请求地址
             String url = et_url.getText().toString();
             //创建网络请求对象
             AsyncHttpClient client= new AsyncHttpClient();
              client.get(url, new AsyncHttpResponseHandler() {
                 @Override
                 public void onSuccess(int statusCode, Header[] headers, byte[] responseBody) {
                     if (statusCode == 200) {
                         //创建工厂对象
                         BitmapFactory bitmapFactory = new BitmapFactory();
                         //工厂对象的decodeByteArray把字节转换成Bitmap对象
                         Bitmap bitmap = bitmapFactory.decodeByteArray(responseBody, 0, responseBody.length);
                         //设置图片
                         img_info.setImageBitmap(bitmap);
                     }
                 }

                 @Override
                 public void onFailure(int statusCode, Header[] headers,
                         byte[] responseBody, Throwable error) {
                     error.printStackTrace();
                 }
             });
             break;

         default:
             break;
         }

     }

 }

重点代码就是这些，自己动手查看一下效果吧！~

 

开源框架资源：http://download.csdn.net/detail/zhaoyazhi2129/7400787

源码：http://download.csdn.net/detail/zhaoyazhi2129/7400815

转发请标明原文地址  http://blog.csdn.net/zhaoyazhi2129/article/details/27048527