NoHttp封裝--05 文件下載

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="下載" />

</LinearLayout>

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      * 下載按鈕、暫停、開始等.
 31      */
 32     private TextView mBtnStart;
 33     /**
 34      * 下載狀態.
 35      */
 36     private TextView mTvResult;
 37     /**
 38      * 下載進度條.
 39      */
 40     private ProgressBar mProgressBar;
 41     /***
 42      * 下載地址.
 43      */
 44     private String url = "http://m.apk.67mo.com/apk/999129_21769077_1443483983292.apk";
 45     /**
 46      * 下載請求.
 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 下載地址
 61         // fileFolder 保存的文件夾
 62         // fileName 文件名
 63         // isRange 是否斷點續傳下載
 64         // isDeleteOld 如果發現文件已經存在是否刪除後重新下載
 65         String path = Environment.getExternalStorageDirectory().getAbsolutePath();
 66         downloadRequest = NoHttp.createDownloadRequest(url, path, "nohttp.apk", true, false);
 67 
 68         // 檢查已經下載了一半的文件是什麼狀態
 69         int status = downloadRequest.checkBeforeStatus();
 70         if (status == DownloadRequest.STATUS_FINISH) {// 文件已經下載完成
 71             mTvResult.setText("下載完成");
 72             mBtnStart.setText("已經下載完成");
 73             // ... 提示用戶安裝apk
 74         } else if (status == DownloadRequest.STATUS_RESTART) {// 代表文件不存在，需要從頭下載
 75             mTvResult.setText("");
 76             mBtnStart.setText("下載");
 77         } else if (status == DownloadRequest.STATUS_RESUME) {// 代表文件已經下載了一半了
 78             int progress = AppConfig.getInstance().getInt(PROGRESS_KEY, 0);
 79             mProgressBar.setProgress(progress);
 80             mTvResult.setText("已經下載了 " + progress + "%");
 81             mBtnStart.setText("繼續下載");
 82         }
 83     }
 84 
 85     @Override
 86     public void onClick(View v) {
 87         if (downloadRequest.isStarted()) {
 88             // 暫停下載
 89             downloadRequest.cancel(true);
 90         } else {
 91             // what 區分下載
 92             // downloadRequest 下載請求對象
 93             // downloadListener 下載監聽
 94             CallServer.getDownloadInstance().add(0, downloadRequest, this);
 95         }
 96     }
 97 
 98     /**
 99      * @param what 代表哪一個下載
100      * @param isResume 是不是斷點續續傳開始下載的
101      * @param beforeLenght 斷點開始的地方的文件大小
102      * @param headers 本地請求的時候的響應頭
103      * @param allCount 本次需要下載多少
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("已下載: " + progress + "%");
109         mBtnStart.setText("暫停");
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("已經下載了 " + progress + "%");
117     }
118 
119     @Override
120     public void onDownloadError(int what, Exception exception) {
121         mBtnStart.setText("再次嘗試");
122 
123         String message = "下載出錯了：";
124         if (exception instanceof ClientError) {
125             message += "客戶端錯誤";
126         } else if (exception instanceof ServerError) {
127             message += "伺服器發生內部錯誤";
128         } else if (exception instanceof NetworkError) {
129             message += "網路不可用，請檢查網路";
130         } else if (exception instanceof StorageReadWriteError) {
131             message += "存儲卡錯誤，請檢查存儲卡";
132         } else if (exception instanceof StorageSpaceNotEnoughError) {
133             message += "存儲位置空間不足";
134         } else if (exception instanceof TimeoutError) {
135             message += "下載超時";
136         } else if (exception instanceof UnKnownHostError) {
137             message += "伺服器找不到";
138         } else if (exception instanceof URLError) {
139             message += "url地址錯誤";
140         } else if (exception instanceof ArgumentError) {
141             message += "下載參數錯誤";
142         } else {
143             message += "未知錯誤";
144         }
145         mTvResult.setText(message);
146     }
147 
148     @Override
149     public void onFinish(int what, String filePath) {
150         Toast.show("下載完成");
151         mTvResult.setText("下載完成，文件保存在：" + filePath);
152     }
153 
154     @Override
155     public void onCancel(int what) {
156         mTvResult.setText("下載暫停");
157         mBtnStart.setText("繼續下載");
158     }
159 
160 }