根据okHttp简单的封装了一个根据url下载文件并更新进度的工具类，在此记录下，以后要使用可以进行参考
先来看看效果图：
接下来看看具体的代码实现
首先在：app中添加项目对于Okhttp的依赖：
//okhttp
compile 'com.squareup.okhttp3:okhttp:3.3.1'
新建Java文件DownloadUtil.java
package com.demo.test;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import okhttp3.Call;
import okhttp3.Callback;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.Response;
public class DownloadUtil {
private static DownloadUtil downloadUtil;
private final OkHttpClient okHttpClient;
public static DownloadUtil get() {
if (downloadUtil == null) {
downloadUtil = new DownloadUtil();
}
return downloadUtil;
}
private DownloadUtil() {
okHttpClient = new OkHttpClient();
}
public void download(final String url, final String destFileDir, final String destFileName, final OnDownloadListener listener) {
Request request = new Request.Builder().url(url).build();
okHttpClient.newCall(request).enqueue(new Callback() {
@Override
public void onFailure(Call call, IOException e) {
// 下载失败监听回调
listener.onDownloadFailed(e);
}
@Override
public void onResponse(Call call, Response response) throws IOException {
InputStream is = null;
byte[] buf = new byte[2048];
int len = 0;
FileOutputStream fos = null;
// 储存下载文件的目录
File dir = new File(destFileDir);
if (!dir.exists()) {
dir.mkdirs();
}
File file = new File(dir, destFileName);
try {
is = response.body().byteStream();
long total = response.body().contentLength();
fos = new FileOutputStream(file);
long sum = 0;
while ((len = is.read(buf)) != -1) {
fos.write(buf, 0, len);
sum += len;
int progress = (int) (sum * 1.0f / total * 100);
// 下载中更新进度条
listener.onDownloading(progress);
}
fos.flush();
// 下载完成
listener.onDownloadSuccess(file);
} catch (Exception e) {
listener.onDownloadFailed(e);
} finally {
try {
if (is != null)
is.close();
} catch (IOException e) {
}
try {
if (fos != null)
fos.close();
} catch (IOException e) {
}
}
}
});
}
public interface OnDownloadListener {
void onDownloadSuccess(File file);
void onDownloading(int progress);
void onDownloadFailed(Exception e);
}
}
使用方法
public void downFile(String url) {
progressDialog = new ProgressDialog(SplashActivity.this);
progressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
progressDialog.setTitle("正在下载");
progressDialog.setMessage("请稍后...");
progressDialog.setProgress(0);
progressDialog.setMax(100);
progressDialog.show();
progressDialog.setCancelable(false);
DownloadUtil.get().download(url, Environment.getExternalStorageDirectory().getAbsolutePath(), "kuoke.apk", new DownloadUtil.OnDownloadListener() {
@Override
public void onDownloadSuccess(File file) {
if (progressDialog != null && progressDialog.isShowing()) {
progressDialog.dismiss();
}
//下载完成进行相关逻辑操作
}
@Override
public void onDownloading(int progress) {
progressDialog.setProgress(progress);
}
@Override
public void onDownloadFailed(Exception e) {
//下载异常进行相关提示操作
}
});
}简单的工具封装，仅供参考，大神多多指教，一起进步