NoHttp封装--05 文件下载
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2022-06-05 08:14:38
xml java: ......
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:
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 }