//下载具体操作
private void download() {
try {
URL url = new URL(downloadUrl);
//打开连接
URLConnection conn = url.openConnection();
//打开输入流
InputStream is = conn.getInputStream();
//获得长度
int contentLength = conn.getContentLength();
Log.e(TAG, "contentLength = " + contentLength);
//创建文件夹 MyDownLoad，在存储卡下
String dirName = Environment.getExternalStorageDirectory() + "/MyDownLoad/";
File file = new File(dirName);
//不存在创建
if (!file.exists()) {
file.mkdir();
}
//下载后的文件名
String fileName = dirName + "xiaomibianqian.apk";
File file1 = new File(fileName);
if (file1.exists()) {
file1.delete();
}
//创建字节流
byte[] bs = new byte[1024];
int len;
OutputStream os = new FileOutputStream(fileName);
//写数据
while ((len = is.read(bs)) != -1) {
os.write(bs, 0, len);
}
//完成后关闭流
Log.e(TAG, "download-finish");
os.close();
is.close();
} catch (Exception e) {
e.printStackTrace();
}
}
}
String dirName = Environment.getExternalStorageDirectory() + "/MyDownLoad/";
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/> <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
