GetAPictureFromInternet网络编程

来源：互联网发布：黑马程序员的亲身经历编辑：程序博客网时间：2024/06/06 06:52

这是《Android 4.0网络编程详解》书上的一个例子，可能是由于版本的原因吧，报了很多错。
新建android工程GetAPictureFromInternet
布局文件main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:id="@+id/LinearLayout1"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical"    tools:context="com.example.getapicturefrominternet.MainActivity" >    <TextView        android:id="@+id/textView1"        android:layout_width="match_parent"        android:layout_height="50sp"        android:text="图片路径："        android:textSize="40sp" />    <EditText        android:id="@+id/path"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:background="@android:drawable/edit_text"        android:text="http://10.107.56.64:8080/ServerForPicture/girl.jpg" >        <!-- 不要用localhost，localhost表示android虚拟机的本机地址，我们要访问的是自己电脑的ip -->        <requestFocus />    </EditText>    <Button        android:id="@+id/button1"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="查看" />    <ImageView        android:id="@+id/imageView1"        android:layout_width="match_parent"        android:layout_height="match_parent" /></LinearLayout>

这里写图片描述

然后是新建服务器
File—>New–>Other–>Server–>Tomcat v7.0 Server–>Finish

新建web项目
File–>New–>Project–>Dynamic WebProject。一路next，最后
这里写图片描述
勾选Generate XXX选项

右键新建的web项目，Run As–>Run On Server.补全地址就会有如下的画面
这里写图片描述
至此，服务器搭建完成

接下来是android工程的编码
MainActivity.java

package com.example.getapicturefrominternet;import android.app.Activity;import android.graphics.Bitmap;import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.EditText;import android.widget.ImageView;public class MainActivity extends Activity {    private EditText path;    private ImageView image;    private Button button;    private Bitmap bitmap;    private Handler myHandler = new Handler(){        public void handleMessage(Message msg) {            if(msg.what == 0){                image.setImageBitmap(bitmap);            }        };    };    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);        path = (EditText)findViewById(R.id.path);        image = (ImageView)findViewById(R.id.imageView1);        button = (Button)findViewById(R.id.button1);        button.setOnClickListener(new OnClickListener() {            @Override            public void onClick(View v) {                final String pathString = path.getText().toString();                new Thread(new Runnable() {                    @Override                    public void run() {                        bitmap = ImageService.getBitmap(pathString);                        myHandler.sendEmptyMessage(0);                    }                }).start();            }        });    }}

ImageService.java

package com.example.getapicturefrominternet;import java.io.ByteArrayOutputStream;import java.io.IOException;import java.io.InputStream;import java.net.HttpURLConnection;import java.net.MalformedURLException;import java.net.URL;import android.graphics.Bitmap;import android.graphics.BitmapFactory;public class ImageService {    public static Bitmap getBitmap(String path) {        Bitmap bitmap = null;        try {            URL url = new URL(path);            HttpURLConnection connection = (HttpURLConnection) url                    .openConnection();            connection.setConnectTimeout(500);            connection.setRequestMethod("GET");            if (connection.getResponseCode() == 200) {                InputStream inputStream = connection.getInputStream();                byte[] buffer = new byte[1024];                int len = -1;                ByteArrayOutputStream bos = new ByteArrayOutputStream();                while ((len = inputStream.read(buffer)) != -1) {                    bos.write(buffer, 0, len);                }                byte[] data = bos.toByteArray();                bos.close();                bitmap = BitmapFactory.decodeByteArray(data, 0, data.length);            }        } catch (MalformedURLException e) {            e.printStackTrace();        } catch (IOException e) {            e.printStackTrace();        }        return bitmap;    }}

书上的代码有问题，按照书上的敲运行一直出错。第一，网络处理函数没有开线程；第二，ImageService的实现也有问题。调试了一大会儿

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