【移動(dòng)應(yīng)用開發(fā)技術(shù)】Android中怎么利用HttpURLConnection下載網(wǎng)絡(luò)圖片

本篇文章給大家分享的是有關(guān)Android中怎么利用HttpURLConnection下載網(wǎng)絡(luò)圖片，在下覺得挺實(shí)用的，因此分享給大家學(xué)習(xí)，希望大家閱讀完這篇文章后可以有所收獲，話不多說(shuō)，跟著在下一起來(lái)看看吧。package

xxxxx.utils;

import

android.app.Activity;

import

android.app.WallpaperManager;

import

android.graphics.Bitmap;

import

android.graphics.BitmapFactory;

import

android.os.Environment;

import

java.io.File;

import

java.io.FileOutputStream;

import

java.io.IOException;

import

java.io.InputStream;

import

.HttpURLConnection;

import

.MalformedURLException;

import

.URL;

public

class

HttpURLConnectionUtil

{

public

static

void

setWallpaper(final

Activity

activity,

final

String

imgUrl)

{

//Log.e("壁紙",

"鏈接："

+

imgUrl);

new

Thread(new

Runnable()

{

@Override

public

void

run()

{

try

{

URL

httpUrl

=

new

URL(imgUrl);//獲取傳入進(jìn)來(lái)的url地址

并捕獲解析過(guò)程產(chǎn)生的異常

//使用是Http訪問(wèn)

所以用HttpURLConnection

同理如果使用的是https

則用HttpsURLConnection

try

{

HttpURLConnection

conn

=

(HttpURLConnection)

httpUrl.openConnection();//通過(guò)httpUrl開啟一個(gè)HttpURLConnection對(duì)象

conn.setReadTimeout(5000);//設(shè)置顯示超市時(shí)間為5秒

conn.setRequestMethod("GET");//設(shè)置訪問(wèn)方式

conn.setDoInput(true);//設(shè)置可以獲取輸入流

InputStream

in

=

conn.getInputStream();//獲取輸入流

//創(chuàng)建一個(gè)寫入ID卡的文件對(duì)象

FileOutputStream

out

=

null;

File

download

=

null;

String

filename

=

String.valueOf(System.currentTimeMillis());//獲取系統(tǒng)時(shí)間

//判斷文件是否存在

Environment.MEDIA_MOUNTEDID卡是否掛載

如果是則創(chuàng)建文件對(duì)象

if

(Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED))

{

File

parent

=

Environment.getExternalStorageDirectory();//獲取ID卡目錄

download

=

new

File(parent,

filename);//在父類的目錄下創(chuàng)建一個(gè)以當(dāng)前下載的系統(tǒng)時(shí)間為文件名的文件

out

=

new

FileOutputStream(download);

}

byte[]

b

=

new

byte[2

*

1024];

int

len;

if

(out

!=

null)

{//id卡如果存在

則寫入

while

((len

=

in.read(b))

!=

-1)

{

out.write(b,

0,

len);

}

}

//讀取該文件中的內(nèi)容

final

Bitmap

bitmap

=

BitmapFactory.decodeFile(download.getAbsolutePath());

activity.runOnUiThread(new

Runnable()

{

@Override

public

void

run()

{

//設(shè)置圖片為壁紙

//Bitmap

bitmap

=

BitmapFactory.decodeResource(this.getResources(),R.drawable.bg_user_top);//設(shè)置項(xiàng)目res中的圖片

WallpaperManager

manager

=

WallpaperManager.getInstance(activity);

try

{

manager.setBitmap(bitmap);

UiUtil.showToastLong(activity,

"壁紙?jiān)O(shè)置成功，請(qǐng)?jiān)谧烂嫔喜榭?);

}

catch

(IOException

e)

{

UiUtil.showToast(activity,

"壁紙?jiān)O(shè)置成失敗");

e.printStackTrace();

}

}

});

}

catch

(IOException

e)

{

e