Androidx学习笔记（47）--- 借助xUtils实现下载

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HttpUtils本身就支持多线程断点续传，使用起来非常的方便

创建HttpUtils对象
```
HttpUtils http = new HttpUtils();
```

下载文件

http.download(url, //下载请求的网址        target, //下载的数据保存路径和文件名        true, //是否开启断点续传        true, //如果服务器响应头中包含了文件名，那么下载完毕后自动重命名        new RequestCallBack<File>() {//侦听下载状态    //下载成功此方法调用    @Override    public void onSuccess(ResponseInfo<File> arg0) {        tv.setText("下载成功" + arg0.result.getPath());    }    //下载失败此方法调用，比如文件已经下载、没有网络权限、文件访问不到，方法传入一个字符串参数告知失败原因    @Override    public void onFailure(HttpException arg0, String arg1) {        tv.setText("下载失败" + arg1);    }    //在下载过程中不断的调用，用于刷新进度条    @Override    public void onLoading(long total, long current, boolean isUploading) {        super.onLoading(total, current, isUploading);        //设置进度条总长度        pb.setMax((int) total);        //设置进度条当前进度        pb.setProgress((int) current);        tv_progress.setText(current * 100 / total + "%");    }});

代码

public class MainActivity extends Activity {private TextView tv_failure;private TextView tv_progress;private ProgressBar pb;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);tv_failure = (TextView) findViewById(R.id.tv_failure);tv_progress = (TextView) findViewById(R.id.tv_progress);pb = (ProgressBar) findViewById(R.id.pb);}public void click(View v){HttpUtils utils = new HttpUtils();String fileName = "QQPlayer.exe";//确定下载地址String path = "http://192.168.13.13:8080/" + fileName;utils.download(path, //下载地址"sdcard/QQPlayer.exe", //文件保存路径true,//是否支持断点续传true, new RequestCallBack<File>() {//下载成功后调用@Overridepublic void onSuccess(ResponseInfo<File> arg0) {Toast.makeText(MainActivity.this, arg0.result.getPath(), 0).show();}//下载失败调用@Overridepublic void onFailure(HttpException arg0, String arg1) {// TODO Auto-generated method stubtv_failure.setText(arg1);}//显示进度的时候调用@Overridepublic void onLoading(long total, long current,boolean isUploading) {// TODO Auto-generated method stubsuper.onLoading(total, current, isUploading);pb.setMax((int)total);pb.setProgress((int)current);tv_progress.setText(current * 100 / total + "%");}});}}

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