开篇都不知道要叨叨啥,唉~,直接进入正题——>go!!
界面就是一个button,就不贴了。
MainActivity
package com.fun.downloaduploaddemo;
import android.os.Bundle;
import android.os.Environment;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;
import java.io.File;
public class MainActivity extends AppCompatActivity {
private Button buttonDownloadFile;
private DownLoadModel model = new DownLoadModel();
private static final String BASE_PATH = Environment.getExternalStorageDirectory().getPath() + File.separator + "aqsc" + File.separator;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
buttonDownloadFile = (Button) findViewById(R.id.bt_downloadFile);
if (model.fileIsExists(BASE_PATH + "在三国杀怪升级当战神.txt")) {
buttonDownloadFile.setText("文件已经下载");
}
buttonDownloadFile.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String url = "http://txt.bookben.com/c_down/2018/03/139675/在三国杀怪升级当战神(书本网www.bookben.com).txt";
if (model.fileIsExists(BASE_PATH + "在三国杀怪升级当战神.txt")) {
Toast.makeText(MainActivity.this, "文件已经存在,正在打开文件!", Toast.LENGTH_SHORT).show();
File file = new File(BASE_PATH + "在三国杀怪升级当战神.txt");
model.openFile(MainActivity.this, file);
} else {
model = new DownLoadModel(MainActivity.this, url, "在三国杀怪升级当战神.txt");
}
}
});
}
@Override
protected void onResume() {
super.onResume();
if (model.fileIsExists(BASE_PATH + "在三国杀怪升级当战神.txt")) {
buttonDownloadFile.setText("文件已经下载");
} else {
buttonDownloadFile.setText("文件下载");
}
}
@Override
protected void onPause() {
super.onPause();
buttonDownloadFile.setText("文件已经下载");
}
}
onResume方法中检查在下载目录中是否存在该文件,存在更改button的text为已经下载,下载完成后直接打开文件,Activity进入onPause方法,重写onPause方法更改button状态。
DownLoadModel
package com.fun.downloaduploaddemo;
import android.Manifest;
import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.net.Uri;
import android.os.Environment;
import android.support.v4.app.ActivityCompat;
import android.text.TextUtils;
import android.util.Log;
import android.widget.Toast;
import org.xutils.common.Callback;
import org.xutils.http.RequestParams;
import org.xutils.x;
import java.io.File;
public class DownLoadModel {
private Context context;
private String url;
private String fileName;
private ProgressDialog progressDialog;
private static final String BASE_PATH = Environment.getExternalStorageDirectory().getPath() + File.separator + "aqsc" + File.separator;
public DownLoadModel(Context context, String url, String fileName) {
this.context = context;
this.url = url;
this.fileName = fileName;
verifyStoragePermissions((Activity) context);
String path = BASE_PATH + fileName;
downloadFile(url, path);
}
public DownLoadModel() {
}
private static final int REQUEST_EXTERNAL_STORAGE = 1;
private static String[] PERMISSIONS_STORAGE = {
Manifest.permission.READ_EXTERNAL_STORAGE,
Manifest.permission.WRITE_EXTERNAL_STORAGE
};
/**
* 检查应用程序是否允许写入存储设备
* 如果应用程序不允许那么会提示用户授予权限
*
* @param activity
*/
public static void verifyStoragePermissions(Activity activity) {
// Check if we have write permission
int permission = ActivityCompat.checkSelfPermission(activity, Manifest.permission.WRITE_EXTERNAL_STORAGE);
if (permission != PackageManager.PERMISSION_GRANTED) {
// We don't have permission so prompt the user
ActivityCompat.requestPermissions(
activity,
PERMISSIONS_STORAGE,
REQUEST_EXTERNAL_STORAGE
);
}
}
private void downloadFile(final String url, final String path) {
progressDialog = new ProgressDialog(context);
RequestParams requestParams = new RequestParams(url);
requestParams.setSaveFilePath(path);
x.http().get(requestParams, new Callback.ProgressCallback<File>() {
@Override
public void onWaiting() {
}
@Override
public void onStarted() {
}
@Override
public void onLoading(long total, long current, boolean isDownloading) {
progressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
progressDialog.setMessage("亲,努力下载中。。。");
progressDialog.show();
progressDialog.setMax((int) total);
progressDialog.setProgress((int) current);
}
@Override
public void onSuccess(File result) {
Toast.makeText(context, "下载成功", Toast.LENGTH_SHORT).show();
Log.e("result", "result=" + result);
progressDialog.dismiss();
openFile(context, result);
}
@Override
public void onError(Throwable ex, boolean isOnCallback) {
ex.printStackTrace();
Toast.makeText(context, "下载失败,请检查网络和SD卡", Toast.LENGTH_SHORT).show();
progressDialog.dismiss();
}
@Override
public void onCancelled(CancelledException cex) {
}
@Override
public void onFinished() {
}
});
}
/**
* 根据文件后缀名匹配MIMEType
*
* @param file
* @return
*/
private static String getMIMEType(File file) {
String type = "*/*";
String name = file.getName();
int index = name.lastIndexOf('.');
if (index < 0) {
return type;
}
String end = name.substring(index, name.length()).toLowerCase();
if (TextUtils.isEmpty(end)) return type;
for (int i = 0; i < MIME_MapTable.length; i++) {
if (end.equals(MIME_MapTable[i][0]))
type = MIME_MapTable[i][1];
}
return type;
}
/**
* 打开文件
*
* @param context
* @param file 文件
*/
public void openFile(Context context, File file) {
Intent intent = new Intent();
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
intent.setAction(Intent.ACTION_VIEW);
String type = getMIMEType(file);
//设置intent的data和Type属性。
intent.setDataAndType(Uri.fromFile(file), type);
context.startActivity(intent);
}
/**
* 自动安装apk文件
*
* @param context
* @param file
*/
public static void openApk(Context context, File file) {
Intent intent = new Intent(Intent.ACTION_VIEW);
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
intent.setDataAndType(Uri.fromFile(file), "application/vnd.android.package-archive");
context.startActivity(intent);
}
//判断文件是否存在
public boolean fileIsExists(String strFile) {
try {
File f = new File(strFile);
if (!f.exists()) {
return false;
}
} catch (Exception e) {
return false;
}
return true;
}
private static final String[][] MIME_MapTable = {
{".3gp", "video/3gpp"},
{".apk", "application/vnd.android.package-archive"},
{".asf", "video/x-ms-asf"},
{".avi", "video/x-msvideo"},
{".bin", "application/octet-stream"},
{".bmp", "image/bmp"},
{".c", "text/plain"},
{".class", "application/octet-stream"},
{".conf", "text/plain"},
{".cpp", "text/plain"},
{".doc", "application/msword"},
{".docx", "application/vnd.openxmlformats-officedocument.wordprocessingml.document"},
{".xls", "application/vnd.ms-excel"},
{".xlsx", "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"},
{".exe", "application/octet-stream"},
{".gif", "image/gif"},
{".gtar", "application/x-gtar"},
{".gz", "application/x-gzip"},
{".h", "text/plain"},
{".htm", "text/html"},
{".html", "text/html"},
{".jar", "application/java-archive"},
{".java", "text/plain"},
{".jpeg", "image/jpeg"},
{".jpg", "image/jpeg"},
{".js", "application/x-javascript"},
{".log", "text/plain"},
{".m3u", "audio/x-mpegurl"},
{".m4a", "audio/mp4a-latm"},
{".m4b", "audio/mp4a-latm"},
{".m4p", "audio/mp4a-latm"},
{".m4u", "video/vnd.mpegurl"},
{".m4v", "video/x-m4v"},
{".mov", "video/quicktime"},
{".mp2", "audio/x-mpeg"},
{".mp3", "audio/x-mpeg"},
{".mp4", "video/mp4"},
{".mpc", "application/vnd.mpohun.certificate"},
{".mpe", "video/mpeg"},
{".mpeg", "video/mpeg"},
{".mpg", "video/mpeg"},
{".mpg4", "video/mp4"},
{".mpga", "audio/mpeg"},
{".msg", "application/vnd.ms-outlook"},
{".ogg", "audio/ogg"},
{".pdf", "application/pdf"},
{".png", "image/png"},
{".pps", "application/vnd.ms-powerpoint"},
{".ppt", "application/vnd.ms-powerpoint"},
{".pptx", "application/vnd.openxmlformats-officedocument.presentationml.presentation"},
{".prop", "text/plain"},
{".rc", "text/plain"},
{".rmvb", "audio/x-pn-realaudio"},
{".rtf", "application/rtf"},
{".sh", "text/plain"},
{".tar", "application/x-tar"},
{".tgz", "application/x-compressed"},
{".txt", "text/plain"},
{".wav", "audio/x-wav"},
{".wma", "audio/x-ms-wma"},
{".wmv", "audio/x-ms-wmv"},
{".wps", "application/vnd.ms-works"},
{".xml", "text/plain"},
{".z", "application/x-compress"},
{".zip", "application/x-zip-compressed"},
{"", "*/*"}
};
}
因为http post请求目标网站会出现 405 Not Allowed 的错误,原因为是Apache、IIS、Nginx等绝大多数web服务器,都不允许静态文件响应POST请求,所以我用的是x.http().get(requestParams, new Callback.ProgressCallback<File>()),没用x.http().post(requestParams, new Callback.ProgressCallback<File>())方法。
小白一枚有什么问题请多多包涵,不过一定要告诉我,继续写bug!!!