OKHttp下载文件

使用OkHttp实现文件下载

最新推荐文章于 2024-09-10 16:08:18 发布

原创最新推荐文章于 2024-09-10 16:08:18 发布 · 5.1k 阅读

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#okhttp下载文件 #java.io.FileNotFoundException

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private static final OkHttpClient client = new OkHttpClient();
private static final int REQUEST_EXTERNAL_STORAGE = 1;

//调用方法。先请求权限
public void downloadFile(){
	verifyStoragePermissions(MainActivity.this);
	downloadFile("要下载的文件路径");
}

//下载文件
private void downloadFile(final String url){
	new Thread(){
		public void run(){
			download(url);
		}
	}.start();
}

//下载
public static void download(final String url){
	final long startTime = System.currentTimeMillis();
	Log.i("DOWNLOAD","startTime="+startTime);
	Request request = new Request.Builder().url(url).build();
	client.newCall(request).enqueue(new Callback() {
		@Override
		public void onFailure(Call call, IOException e) {
			// 下载失败
			e.printStackTrace();
			Log.i("DOWNLOAD","download failed");
		}
		@Override
		public void onResponse(Call call, Response response) throws IOException {
			Sink sink = null;
			BufferedSink bufferedSink = null;
			try {
				String mSDCardPath= Environment.getExternalStorageDirectory().getAbsolutePath();//SD卡路径
                //String appPath= getApplicationContext().getFilesDir().getAbsolutePath();//此APP的files路径
				File dest = new File(appPath,url.substring(url.lastIndexOf("/") + 1));
                    sink = Okio.sink(dest);
                    bufferedSink = Okio.buffer(sink);
                    bufferedSink.writeAll(response.body().source());

                    bufferedSink.close();
                    Log.i("DOWNLOAD","download success");
                    Log.i("DOWNLOAD","totalTime="+ (System.currentTimeMillis() - startTime));
                } catch (Exception e) {
                    e.printStackTrace();
                    Log.i("DOWNLOAD","download failed");
                } finally {
                    if(bufferedSink != null){
                        bufferedSink.close();
                    }
                }
            }
        });
    }

//请求权限代码

 private static String[] PERMISSIONS_STORAGE = {
            Manifest.permission.READ_EXTERNAL_STORAGE,
            Manifest.permission.WRITE_EXTERNAL_STORAGE };
    public static void verifyStoragePermissions(Activity activity) {
        int permission = ActivityCompat.checkSelfPermission(activity,
                Manifest.permission.WRITE_EXTERNAL_STORAGE);
        if (permission != PackageManager.PERMISSION_GRANTED) {
            ActivityCompat.requestPermissions(activity, PERMISSIONS_STORAGE,
                    REQUEST_EXTERNAL_STORAGE);
        }
    }

//需要添加的权限

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />