易采站长站为您分析Android中实现下载URL地址的网络资源的实例,其中还有一个进行多线程下载的Java代码示例,非常典型,需要的朋友可以参考下
通过URL来获取网络资源并下载资源简单实例：
package com.android.xiong.urltest;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
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.Message;
import android.view.Menu;
import android.widget.ImageView;
public class MainActivity extends Activity {
ImageView show;
Bitmap bitmap;
Handler handler = new Handler() {
@Override
public void handleMessage(Message msg) {
if (msg.what == 0x123) {
// 使用ImageView显示该图片
show.setImageBitmap(bitmap);
}
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
show = (ImageView) findViewById(R.id.show);
new Thread() {
@Override
public void run() {
// 定义一个URL对象
URL url;
try {
url = new URL(
"http://www.easck.com/news/pics/hv1/37/195/1468/95506462.jpg");
// 打开该URL的资源输入流
InputStream is = url.openStream();
// 从InputStream中解析出图片
bitmap = BitmapFactory.decodeStream(is);
// 发送消息
handler.sendEmptyMessage(0x123);
is.close();
// 再次打开RL对应的资源输入流
is = url.openStream();
// 打开手机文件对应的输出流
OutputStream os = openFileOutput("KEQIANG.JPG", MODE_APPEND);
byte[] buff = new byte[1024];
int hasRead = 0;
// 将URL资源下载到本地
while ((hasRead = is.read(buff)) > 0) {
os.write(buff, 0, hasRead);
}
is.close();
os.close();
} catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}.start();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}
