添加相关OKHttp的依赖后，复制以下代码即可。
final String url = "http://192.168.3.127:8081/aaaa.txt";
final String fileName = "aaaa.txt";
final long startTime = System.currentTimeMillis();
OkHttpClient okHttpClient =new OkHttpClient();
Request request =new Request.Builder()
.url(url)
.addHeader("Connection", "close")
.build();
okHttpClient.newCall(request).enqueue(new Callback() {
@Override
public void onFailure(Call call, IOException e) {
Logger.e("@" + e.getMessage());
closeloading();
showShortToast("下载失败");
}
@Override
public void onResponse(Call call, Response response)throws IOException {
showloading("正在下载1%");
InputStream is =null;
byte[] buf =new byte[2048];
int len =0;
FileOutputStream fos =null;
String savePath = Environment.getExternalStorageDirectory().getAbsolutePath(); // 储存下载文件的目录
File filedir =new File(savePath);
if (!filedir.exists()) {
filedir.mkdir();
}
try {
is = response.body().byteStream();
long total = response.body().contentLength();
File file =new File(savePath, fileName);
if (file.exists()) {
file.delete(); // 覆盖（删除原先的文件）
}
fos =new FileOutputStream(file);
long sum =0;
int oldProgress = -1;
while ((len = is.read(buf)) != -1) {
fos.write(buf, 0, len);
sum += len;
int progress = (int) (sum *1.0f / total *100);
if (oldProgress != progress) {
oldProgress = progress;
Logger.i("下载进度" + progress);
showloading("正在下载" + progress + "%");
}
}
fos.flush();
closeloading();
showShortToast("下载完成");
Logger.i("下载完成，用时：" + (System.currentTimeMillis() -startTime));
}catch (Exception e) {
closeloading();
showShortToast("下载失败");
Logger.e("下载失败" + e.getMessage());
}finally {
try {
if (is !=null) {
is.close();
}
}catch (IOException e) {
Logger.e("11" + e.getMessage());
}
try {
if (fos !=null) {
fos.close();
}
}catch (IOException e) {
Logger.e("22" + e.getMessage());
}
}
}
});
安装：注意Android7.0后和前的区别
参考：https://blog.csdn.net/u010356768/article/details/89212742
try {
Intent intent =new Intent(Intent.ACTION_VIEW);
File apkFile =new File(fullPath);
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
intent.setFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
Uri uri = FileProvider.getUriForFile(getActivity(), *****+".provider", apkFile);
intent.setDataAndType(uri, "application/vnd.android.package-archive");
}else {
intent.setDataAndType(Uri.fromFile(apkFile), "application/vnd.android.package-archive");
}
startActivity(intent);
}catch (Exception e) {
Logger.e("无法安装" + e.getMessage());
}
