<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="match_parent"

    android:layout_height="wrap_content"

    android:orientation="vertical" >

    <ProgressBar

        android:id="@+id/pb_progress"

        style="?android:attr/progressBarStyleHorizontal"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:layout_margin="10dp" />

    <TextView

        android:id="@+id/tv_result"

        android:layout_width="match_parent"

        android:layout_height="wrap_content" />

    <Button

        android:id="@+id/btn_start_download"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:layout_marginTop="10dp"

        android:text="下载" />

</LinearLayout>

 import com.yolanda.nohttp.Headers;

 import com.yolanda.nohttp.NoHttp;

 import com.yolanda.nohttp.download.DownloadListener;

 import com.yolanda.nohttp.download.DownloadRequest;

 import com.yolanda.nohttp.error.ArgumentError;

 import com.yolanda.nohttp.error.ClientError;

 import com.yolanda.nohttp.error.NetworkError;

 import com.yolanda.nohttp.error.ServerError;

 import com.yolanda.nohttp.error.StorageReadWriteError;

 import com.yolanda.nohttp.error.StorageSpaceNotEnoughError;

 import com.yolanda.nohttp.error.TimeoutError;

 import com.yolanda.nohttp.error.URLError;

 import com.yolanda.nohttp.error.UnKnownHostError;

 import com.yolanda.nohttp5.R;

 import com.yolanda.nohttp5.config.AppConfig;

 import com.yolanda.nohttp5.nohttp.CallServer;

 import com.yolanda.nohttp5.util.Toast;

 import android.app.Activity;

 import android.os.Bundle;

 import android.os.Environment;

 import android.view.View;

 import android.widget.ProgressBar;

 import android.widget.TextView;

 public class DownloadActivity extends Activity implements View.OnClickListener, DownloadListener {

     private final static String PROGRESS_KEY = "download_progress";

     /**

      * 下载按钮、暂停、开始等.

      */

     private TextView mBtnStart;

     /**

      * 下载状态.

      */

     private TextView mTvResult;

     /**

      * 下载进度条.

      */

     private ProgressBar mProgressBar;

     /***

      * 下载地址.

      */

     private String url = "http://m.apk.67mo.com/apk/999129_21769077_1443483983292.apk";

     /**

      * 下载请求.

      */

     private DownloadRequest downloadRequest;

     @Override

     protected void onCreate(Bundle savedInstanceState) {

         super.onCreate(savedInstanceState);

         setContentView(R.layout.activity_download);

         mProgressBar = (ProgressBar) findViewById(R.id.pb_progress);

         mBtnStart = (TextView) findViewById(R.id.btn_start_download);

         mTvResult = (TextView) findViewById(R.id.tv_result);

         mBtnStart.setOnClickListener(this);

         // url 下载地址

         // fileFolder 保存的文件夹

         // fileName 文件名

         // isRange 是否断点续传下载

         // isDeleteOld 如果发现文件已经存在是否删除后重新下载

         String path = Environment.getExternalStorageDirectory().getAbsolutePath();

         downloadRequest = NoHttp.createDownloadRequest(url, path, "nohttp.apk", true, false);

         // 检查已经下载了一半的文件是什么状态

         int status = downloadRequest.checkBeforeStatus();

         if (status == DownloadRequest.STATUS_FINISH) {// 文件已经下载完成

             mTvResult.setText("下载完成");

             mBtnStart.setText("已经下载完成");

             // ... 提示用户安装apk

         } else if (status == DownloadRequest.STATUS_RESTART) {// 代表文件不存在，需要从头下载

             mTvResult.setText("");

             mBtnStart.setText("下载");

         } else if (status == DownloadRequest.STATUS_RESUME) {// 代表文件已经下载了一半了

             int progress = AppConfig.getInstance().getInt(PROGRESS_KEY, );

             mProgressBar.setProgress(progress);

             mTvResult.setText("已经下载了 " + progress + "%");

             mBtnStart.setText("继续下载");

         }

     }

     @Override

     public void onClick(View v) {

         if (downloadRequest.isStarted()) {

             // 暂停下载

             downloadRequest.cancel(true);

         } else {

             // what 区分下载

             // downloadRequest 下载请求对象

             // downloadListener 下载监听

             CallServer.getDownloadInstance().add(, downloadRequest, this);

         }

     }

     /**

      * @param what 代表哪一个下载

      * @param isResume 是不是断点续续传开始下载的

      * @param beforeLenght 断点开始的地方的文件大小

      * @param headers 本地请求的时候的响应头

      * @param allCount 本次需要下载多少

      */

     @Override

     public void onStart(int what, boolean isResume, long beforeLenght, Headers headers, long allCount) {

         int progress = AppConfig.getInstance().getInt(PROGRESS_KEY, );

         mTvResult.setText("已下载: " + progress + "%");

         mBtnStart.setText("暂停");

     }

     @Override

     public void onProgress(int what, int progress, long fileCount) {

         AppConfig.getInstance().putInt(PROGRESS_KEY, progress);

         mProgressBar.setProgress(progress);

         mTvResult.setText("已经下载了 " + progress + "%");

     }

     @Override

     public void onDownloadError(int what, Exception exception) {

         mBtnStart.setText("再次尝试");

         String message = "下载出错了：";

         if (exception instanceof ClientError) {

             message += "客户端错误";

         } else if (exception instanceof ServerError) {

             message += "服务器发生内部错误";

         } else if (exception instanceof NetworkError) {

             message += "网络不可用，请检查网络";

         } else if (exception instanceof StorageReadWriteError) {

             message += "存储卡错误，请检查存储卡";

         } else if (exception instanceof StorageSpaceNotEnoughError) {

             message += "存储位置空间不足";

         } else if (exception instanceof TimeoutError) {

             message += "下载超时";

         } else if (exception instanceof UnKnownHostError) {

             message += "服务器找不到";

         } else if (exception instanceof URLError) {

             message += "url地址错误";

         } else if (exception instanceof ArgumentError) {

             message += "下载参数错误";

         } else {

             message += "未知错误";

         }

         mTvResult.setText(message);

     }

     @Override

     public void onFinish(int what, String filePath) {

         Toast.show("下载完成");

         mTvResult.setText("下载完成，文件保存在：" + filePath);

     }

     @Override

     public void onCancel(int what) {

         mTvResult.setText("下载暂停");

         mBtnStart.setText("继续下载");

     }

 }