android之通过URL来获取网络资源并下载资源简单实例

时间：2022-11-26 11:06:40

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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://img1.gtimg.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;
}

}

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity" >

    <ImageView 
        android:id="@+id/show"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:contentDescription="@string/hello_world"/>

</LinearLayout>

 

</pre><pre code_snippet_id="86820" snippet_file_name="blog_20131128_4_1113442" name="code" class="html"> <uses-permission 
        android:name="android.permission.INTERNET"/>



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