网络通用图片下载器
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网络通用图片下载器 |
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工具类： NetImageViewer.java package cn.zengfansheng.imageviewer.utils;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.ProtocolException;
import java.net.URL;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Handler;
import android.os.Message;
/**
* 网络图片通用下载器工具类
*/
public abstract class NetImageViewer {
// 1、子线程下载图片
// 2、子线程下载图片完成后，通知主线程更新UI
/**
* 3、下载完毕后，调用的方法
*
* @param bitmap
*/
public abstract void onImageLoaded(Bitmap bitmap);
/**
* 2、图片下载后，如何处理
*/
private Handler handler = new Handler() {
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
Bitmap bitmap = (Bitmap) msg.obj;
onImageLoaded(bitmap);
}
};
/**
* 1、到指定的path下载图片，然后发送消息
*
* @param path 图片的路径
* @throws IOException
*/
public void downloadImage(final String path) {
new Thread() {
@Override
public void run() {
try {
// 1、获取url
URL url = new URL(path);
// 2、获取url的HttpURLConnection
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
// 3、设置连接的请求信息
conn.setRequestMethod("GET");
conn.setReadTimeout(5000);
conn.setConnectTimeout(5000);
// 4、如果服务器返回码为200
int code = conn.getResponseCode();
if (code == 200) {
// 5、获取输入流
InputStream in = conn.getInputStream();
// 6、将输入流转成Bitmap对象
Bitmap bitmap = BitmapFactory.decodeStream(in);
// 7、发送消息
Message msg = new Message();
msg.obj = bitmap;
handler.sendMessage(msg);
}
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (ProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
}.start();
}
} |
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测试类： package cn.zengfansheng.imageviewer;
import android.app.Activity;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.widget.ImageView;
import cn.zengfansheng.imageviewer.utils.NetImageViewer;
public class MainActivity extends Activity {
private ImageView iv;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
iv = (ImageView) this.findViewById(R.id.iv);
NetImageViewer netImageViewer = new NetImageViewer() {
@Override
public void onImageLoaded(Bitmap bitmap) {
iv.setImageBitmap(bitmap);
}
};
netImageViewer.downloadImage("http://192.168.221.221:8080/me/beauty.jpg");
}
} |