Android Network数据存储

package com.Aina.Android;

import java.io.BufferedInputStream;
import java.io.InputStream;
import java.net.URL;
import java.net.URLConnection;

import org.apache.http.util.ByteArrayBuffer;

import android.app.Activity;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.view.KeyEvent;
import android.widget.TextView;

public class Test_Network extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        this.setTitle("1>.按下CENTER键发送邮件 2>.按下KEY_DOWN键下载网络上的数据");
    }

	@Override
	public boolean onKeyDown(int keyCode, KeyEvent event) {
		if(keyCode==KeyEvent.KEYCODE_DPAD_CENTER){
			Uri uri = Uri.parse("mailto:xxxx.com");//邮件地址,注意:此处一定要加<mailto:>,否则无法发送.
			Intent intent = new Intent(Intent.ACTION_SENDTO,uri);//创建Intent
			intent.putExtra(Intent.EXTRA_SUBJECT, "数据备份");//设置邮件主题
			intent.putExtra(Intent.EXTRA_TEXT, "100000备份数据");//设置邮件内容
			this.startActivity(intent);
//			this.finish();
		}else if(keyCode==KeyEvent.KEYCODE_DPAD_DOWN){
			TextView tv = (TextView) this.findViewById(R.id.TextView);
			String myString = "";
			try{
				URL url = new URL("http://192.168.1.3:8080/android.txt");//定义访问的地址
				URLConnection urlconn = url.openConnection();//打开连接
				InputStream input = urlconn.getInputStream();//获得输入流
				int count = 0;
//				BufferedInputStream bis = new BufferedInputStream(input);
//				ByteArrayBuffer baf = new ByteArrayBuffer(100);				
//				while((count = bis.read())!=-1){
//					baf.append((byte)count);
//				}
//				myString = new String(baf.toByteArray());
				
				StringBuffer sb = new StringBuffer();
				while((count = input.read())!=-1){
					sb.append((char)count);
				}
				myString = sb.toString();
			}catch(Exception ex){
				myString = ex.getMessage();
				ex.printStackTrace();
				
			}
			tv.setText(myString);
		}
		return super.onKeyDown(keyCode, event);
	}
    
    
}

由于在程序中访问了网络，我们需要在AndroidManifest.xml文件中给于权限：
<uses-permission android:name="android.permission.INTERNET" />