NoHttp封装--05 文件下载

xml

<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>

java:

 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");
     }

 }