关于android的网络访问——实现网络图片查看器

       代码很简单，知识实现一个简单的网络图片查看器的功能，具体实现过程的照片我就不贴了，具体实现的代码如下：

   

             一。布局代码：

                 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >

<EditText
android:id="@+id/imagePath"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="http://www.faxingw.cn/userimg/201110/30147.jpg">
</EditText>

<Button
android:id="@+id/check"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="查看图片" />

<ImageView
android:id="@+id/imageView"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />

</LinearLayout>
   二。功能实现代码：

  package org.jrue.netImageCehecker.activity;

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.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.os.Handler;
import android.os.Looper;
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 imagePath;
private Button btn_check;
private ImageView iv;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

inti();
}

private void inti() {
imagePath = (EditText)findViewById(R.id.imagePath);
btn_check = (Button)findViewById(R.id.check);
iv = (ImageView)findViewById(R.id.imageView);

btn_check.setOnClickListener(new OnClickListener() {

@Override
public void onClick(View v) {
new Thread(runnable).start();
}
});
}

private Runnable runnable = new Runnable(){

@Override
public void run() {
String path = imagePath.getText().toString().trim();
byte[] data = null;
try {
URL url = new URL(path);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setConnectTimeout(5000);
conn.setRequestMethod("GET");
if(conn.getResponseCode() == 200){
InputStream is = conn.getInputStream();
ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
byte[] buffer = new byte[1024];
int len = 0;
while((len = is.read(buffer))!= -1){
outputStream.write(buffer, 0, len);
}
outputStream.close();
data = outputStream.toByteArray();
}

Bitmap bitmap = BitmapFactory.decodeByteArray(data, 0, data.length);
Looper.prepare();
Message msg = new Message();
msg.what = 0;
msg.obj = bitmap;
handler.sendMessage(msg);
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}

}

};
private Handler handler = new Handler(){
public void handleMessage(Message msg) {
if(msg.what == 0){
iv.setImageBitmap((Bitmap) msg.obj);
}
};
};

}

很简单，而且代码放在一起比较冗杂，感兴趣的可以细分下来，定义service包，utils包之类的，以实现代码清晰化。这是很好的编码风格。这里只为展示需要，并没有做多大的处理。