NoHttp封装--05 文件下载

摘要：下载下载按钮暂停开始等下载状态下载进度条下载地址下载请求下载地址保存的文件夹文件名是否断点续传下载如果发现文件已经存在是否删除后重新下载检查已经下载了一半的文件是什么状态文件已经下载完成下载完成已经下载完成提示用户安装代表文件不存在，需要从

xml

java:

  1 import com.yolanda.nohttp.Headers;
  2 import com.yolanda.nohttp.NoHttp;
  3 import com.yolanda.nohttp.download.DownloadListener;
  4 import com.yolanda.nohttp.download.DownloadRequest;
  5 import com.yolanda.nohttp.error.ArgumentError;
  6 import com.yolanda.nohttp.error.ClientError;
  7 import com.yolanda.nohttp.error.NetworkError;
  8 import com.yolanda.nohttp.error.ServerError;
  9 import com.yolanda.nohttp.error.StorageReadWriteError;
 10 import com.yolanda.nohttp.error.StorageSpaceNotEnoughError;
 11 import com.yolanda.nohttp.error.TimeoutError;
 12 import com.yolanda.nohttp.error.URLError;
 13 import com.yolanda.nohttp.error.UnKnownHostError;
 14 import com.yolanda.nohttp5.R;
 15 import com.yolanda.nohttp5.config.AppConfig;
 16 import com.yolanda.nohttp5.nohttp.CallServer;
 17 import com.yolanda.nohttp5.util.Toast;
 18 
 19 import android.app.Activity;
 20 import android.os.Bundle;
 21 import android.os.Environment;
 22 import android.view.View;
 23 import android.widget.ProgressBar;
 24 import android.widget.TextView;
 25 
 26 public class DownloadActivity extends Activity implements View.OnClickListener, DownloadListener {
 27 
 28     private final static String PROGRESS_KEY = "download_progress";
 29     /**
 30      * 下载按钮、暂停、开始等.
 31      */
 32     private TextView mBtnStart;
 33     /**
 34      * 下载状态.
 35      */
 36     private TextView mTvResult;
 37     /**
 38      * 下载进度条.
 39      */
 40     private ProgressBar mProgressBar;
 41     /***
 42      * 下载地址.
 43      */
 44     private String url = "http://m.apk.67mo.com/apk/999129_21769077_1443483983292.apk";
 45     /**
 46      * 下载请求.
 47      */
 48     private DownloadRequest downloadRequest;
 49 
 50     @Override
 51     protected void onCreate(Bundle savedInstanceState) {
 52         super.onCreate(savedInstanceState);
 53         setContentView(R.layout.activity_download);
 54 
 55         mProgressBar = (ProgressBar) findViewById(R.id.pb_progress);
 56         mBtnStart = (TextView) findViewById(R.id.btn_start_download);
 57         mTvResult = (TextView) findViewById(R.id.tv_result);
 58         mBtnStart.setOnClickListener(this);
 59 
 60         // url 下载地址
 61         // fileFolder 保存的文件夹
 62         // fileName 文件名
 63         // isRange 是否断点续传下载
 64         // isDeleteOld 如果发现文件已经存在是否删除后重新下载
 65         String path = Environment.getExternalStorageDirectory().getAbsolutePath();
 66         downloadRequest = NoHttp.createDownloadRequest(url, path, "nohttp.apk", true, false);
 67 
 68         // 检查已经下载了一半的文件是什么状态
 69         int status = downloadRequest.checkBeforeStatus();
 70         if (status == DownloadRequest.STATUS_FINISH) {// 文件已经下载完成
 71             mTvResult.setText("下载完成");
 72             mBtnStart.setText("已经下载完成");
 73             // ... 提示用户安装apk
 74         } else if (status == DownloadRequest.STATUS_RESTART) {// 代表文件不存在，需要从头下载
 75             mTvResult.setText("");
 76             mBtnStart.setText("下载");
 77         } else if (status == DownloadRequest.STATUS_RESUME) {// 代表文件已经下载了一半了
 78             int progress = AppConfig.getInstance().getInt(PROGRESS_KEY, 0);
 79             mProgressBar.setProgress(progress);
 80             mTvResult.setText("已经下载了 " + progress + "%");
 81             mBtnStart.setText("继续下载");
 82         }
 83     }
 84 
 85     @Override
 86     public void onClick(View v) {
 87         if (downloadRequest.isStarted()) {
 88             // 暂停下载
 89             downloadRequest.cancel(true);
 90         } else {
 91             // what 区分下载
 92             // downloadRequest 下载请求对象
 93             // downloadListener 下载监听
 94             CallServer.getDownloadInstance().add(0, downloadRequest, this);
 95         }
 96     }
 97 
 98     /**
 99      * @param what 代表哪一个下载
100      * @param isResume 是不是断点续续传开始下载的
101      * @param beforeLenght 断点开始的地方的文件大小
102      * @param headers 本地请求的时候的响应头
103      * @param allCount 本次需要下载多少
104      */
105     @Override
106     public void onStart(int what, boolean isResume, long beforeLenght, Headers headers, long allCount) {
107         int progress = AppConfig.getInstance().getInt(PROGRESS_KEY, 0);
108         mTvResult.setText("已下载: " + progress + "%");
109         mBtnStart.setText("暂停");
110     }
111 
112     @Override
113     public void onProgress(int what, int progress, long fileCount) {
114         AppConfig.getInstance().putInt(PROGRESS_KEY, progress);
115         mProgressBar.setProgress(progress);
116         mTvResult.setText("已经下载了 " + progress + "%");
117     }
118 
119     @Override
120     public void onDownloadError(int what, Exception exception) {
121         mBtnStart.setText("再次尝试");
122 
123         String message = "下载出错了：";
124         if (exception instanceof ClientError) {
125             message += "客户端错误";
126         } else if (exception instanceof ServerError) {
127             message += "服务器发生内部错误";
128         } else if (exception instanceof NetworkError) {
129             message += "网络不可用，请检查网络";
130         } else if (exception instanceof StorageReadWriteError) {
131             message += "存储卡错误，请检查存储卡";
132         } else if (exception instanceof StorageSpaceNotEnoughError) {
133             message += "存储位置空间不足";
134         } else if (exception instanceof TimeoutError) {
135             message += "下载超时";
136         } else if (exception instanceof UnKnownHostError) {
137             message += "服务器找不到";
138         } else if (exception instanceof URLError) {
139             message += "url地址错误";
140         } else if (exception instanceof ArgumentError) {
141             message += "下载参数错误";
142         } else {
143             message += "未知错误";
144         }
145         mTvResult.setText(message);
146     }
147 
148     @Override
149     public void onFinish(int what, String filePath) {
150         Toast.show("下载完成");
151         mTvResult.setText("下载完成，文件保存在：" + filePath);
152     }
153 
154     @Override
155     public void onCancel(int what) {
156         mTvResult.setText("下载暂停");
157         mBtnStart.setText("继续下载");
158     }
159 
160 }