android移动开发-单文件下载-基于官方DownLoadManager进行

代码取自Demo ,实现单文件下载并弹出打开方式，由于采用意图Intent方式，所以很多高度定制的Rom就可能进入异常了，我在后期会整合网络资源，整理出一个新的方案！

/**
* Created by Administrator on 2016/11/23.
*/

public class DownLoadMng {
/**
* 得到一个经过基本初始化的请求实例
*
* @param url
* @return
*/
public static DownloadManager.Request getRequest(String url) {

DownloadManager.Request request = new DownloadManager.Request(Uri.parse(url));
//设置在什么网络情况下进行下载
request.setAllowedNetworkTypes(DownloadManager.Request.NETWORK_WIFI);
//设置通知栏标题
request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE);
request.setTitle("通知栏显示");
request.setDescription("通知栏下拉的条目上显示");
request.setAllowedOverRoaming(false);

return request;
}

/**
* 这个好用
*
* @param activity activity引用，用于跳intent
* @param path     文件路径
*/
public static void openFile2(Activity activity, String path) {
File f = new File(path);
Intent intent = new Intent();
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
intent.setAction(android.content.Intent.ACTION_VIEW);

/* 调用getMIMEType()来取得MimeType */
String type = getMIMEType(f);
/* 设置intent的file与MimeType */
intent.setDataAndType(Uri.fromFile(f), type);
try {
activity.startActivity(intent);
} catch (ActivityNotFoundException e) {
Toast.makeText(context, "附件无法打开，请下载相关软件！", 500).show();
}
}

/* 判断文件MimeType的method */
private static String getMIMEType(File f) {
String type = "";
String fName = f.getName();
/* 取得扩展名 */
String end = fName.substring(fName.lastIndexOf(".") + 1, fName.length()).toLowerCase();

/* 依扩展名的类型决定MimeType */
if (end.equals("m4a") || end.equals("mp3") || end.equals("mid") ||
end.equals("xmf") || end.equals("ogg") || end.equals("wav")) {
type = "audio";
} else if (end.equals("3gp") || end.equals("mp4")) {
type = "video";
} else if (end.equals("jpg") || end.equals("gif") || end.equals("png") ||
end.equals("jpeg") || end.equals("bmp")) {
type = "image";
} else if (end.equals("apk")) {
/* android.permission.INSTALL_PACKAGES */
type = "application/vnd.android.package-archive";
} else if (end.equals("xls")) {
type = "application/vnd.ms-excel";
} else if (end.equals("word") || end.contains("doc")) {
type = "application/msword";
}
/*如果无法直接打开，就跳出软件列表给用户选择 */
if (end.equals("apk")) {
} else {
type += "/*";
}
return type;
}

/**
* 这个有隐藏bug  不用了   并且下面的方法全引用自此方法  故不用
*
* @param filePath
* @return
*/
@Deprecated
public static Intent openFile(String filePath) {

File file = new File(filePath);
if (!file.exists()) return null;
/* 取得扩展名 */
String end = file.getName().substring(file.getName().lastIndexOf(".") + 1, file.getName().length()).toLowerCase();
/* 依扩展名的类型决定MimeType */
if (end.equals("m4a") || end.equals("mp3") || end.equals("mid") ||
end.equals("xmf") || end.equals("ogg") || end.equals("wav")) {
return getAudioFileIntent(filePath);
} else if (end.equals("3gp") || end.equals("mp4")) {
return getAudioFileIntent(filePath);
} else if (end.equals("jpg") || end.equals("gif") || end.equals("png") ||
end.equals("jpeg") || end.equals("bmp")) {
return getImageFileIntent(filePath);
} else if (end.equals("apk")) {
return getApkFileIntent(filePath);
} else if (end.equals("ppt")) {
return getPptFileIntent(filePath);
} else if (end.equals("xls")) {
return getExcelFileIntent(filePath);
} else if (end.equals("doc")) {
return getWordFileIntent(filePath);
} else if (end.equals("pdf")) {
return getPdfFileIntent(filePath);
} else if (end.equals("chm")) {
return getChmFileIntent(filePath);
} else if (end.equals("txt")) {
return getTextFileIntent(filePath, false);
} else {
return getAllIntent(filePath);
}
}

//Android获取一个用于打开APK文件的intent
@Deprecated
public static Intent getAllIntent(String param) {

Intent intent = new Intent();
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
intent.setAction(android.content.Intent.ACTION_VIEW);
Uri uri = Uri.fromFile(new File(param));
intent.setDataAndType(uri, "*/*");
return intent;
}

//Android获取一个用于打开APK文件的intent
public static Intent getApkFileIntent(String param) {

Intent intent = new Intent();
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
intent.setAction(android.content.Intent.ACTION_VIEW);
Uri uri = Uri.fromFile(new File(param));
intent.setDataAndType(uri, "application/vnd.android.package-archive");
return intent;
}

//Android获取一个用于打开VIDEO文件的intent
public static Intent getVideoFileIntent(String param) {

Intent intent = new Intent("android.intent.action.VIEW");
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
intent.putExtra("oneshot", 0);
intent.putExtra("configchange", 0);
Uri uri = Uri.fromFile(new File(param));
intent.setDataAndType(uri, "video/*");
return intent;
}

//Android获取一个用于打开AUDIO文件的intent
public static Intent getAudioFileIntent(String param) {

Intent intent = new Intent("android.intent.action.VIEW");
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
intent.putExtra("oneshot", 0);
intent.putExtra("configchange", 0);
Uri uri = Uri.fromFile(new File(param));
intent.setDataAndType(uri, "audio/*");
return intent;
}

//Android获取一个用于打开Html文件的intent
public static Intent getHtmlFileIntent(String param) {

Uri uri = Uri.parse(param).buildUpon().encodedAuthority("com.android.htmlfileprovider").scheme("content").encodedPath(param).build();
Intent intent = new Intent("android.intent.action.VIEW");
intent.setDataAndType(uri, "text/html");
return intent;
}

//Android获取一个用于打开图片文件的intent
public static Intent getImageFileIntent(String param) {

Intent intent = new Intent("android.intent.action.VIEW");
intent.addCategory("android.intent.category.DEFAULT");
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
Uri uri = Uri.fromFile(new File(param));
intent.setDataAndType(uri, "image/*");
return intent;
}

//Android获取一个用于打开PPT文件的intent
public static Intent getPptFileIntent(String param) {

Intent intent = new Intent("android.intent.action.VIEW");
intent.addCategory("android.intent.category.DEFAULT");
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
Uri uri = Uri.fromFile(new File(param));
intent.setDataAndType(uri, "application/vnd.ms-powerpoint");
return intent;
}

//Android获取一个用于打开Excel文件的intent
public static Intent getExcelFileIntent(String param) {

Intent intent = new Intent("android.intent.action.VIEW");
intent.addCategory("android.intent.category.DEFAULT");
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
Uri uri = Uri.fromFile(new File(param));
intent.setDataAndType(uri, "application/vnd.ms-excel");
return intent;
}

//Android获取一个用于打开Word文件的intent
public static Intent getWordFileIntent(String param) {

Intent intent = new Intent("android.intent.action.VIEW");
intent.addCategory("android.intent.category.DEFAULT");
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
Uri uri = Uri.fromFile(new File(param));
intent.setDataAndType(uri, "application/msword");
return intent;
}

//Android获取一个用于打开CHM文件的intent
public static Intent getChmFileIntent(String param) {

Intent intent = new Intent("android.intent.action.VIEW");
intent.addCategory("android.intent.category.DEFAULT");
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
Uri uri = Uri.fromFile(new File(param));
intent.setDataAndType(uri, "application/x-chm");
return intent;
}

//Android获取一个用于打开文本文件的intent
public static Intent getTextFileIntent(String param, boolean paramBoolean) {

Intent intent = new Intent("android.intent.action.VIEW");
intent.addCategory("android.intent.category.DEFAULT");
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
if (paramBoolean) {
Uri uri1 = Uri.parse(param);
intent.setDataAndType(uri1, "text/plain");
} else {
Uri uri2 = Uri.fromFile(new File(param));
intent.setDataAndType(uri2, "text/plain");
}
return intent;
}

//Android获取一个用于打开PDF文件的intent
public static Intent getPdfFileIntent(String param) {

Intent intent = new Intent("android.intent.action.VIEW");
intent.addCategory("android.intent.category.DEFAULT");
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
Uri uri = Uri.fromFile(new File(param));
intent.setDataAndType(uri, "application/pdf");
return intent;
}
}

private void downLoad(){
DownloadManager.Request request = DownLoadMng.getRequest(url);
//设置文件存放目录
path = "/yangguang";//Environment.getExternalStorageDirectory().getAbsolutePath()
isFolderExist(path);//文件夹判空
filename = accessmodel.getData().getFile_list().get(position).getTitle();
request.setDestinationInExternalPublicDir(path, filename);
absolutePath = path + "/" + filename;
downManager = (DownloadManager) getActivity().getSystemService(Context.DOWNLOAD_SERVICE);
id = downManager.enqueue(request);
getActivity().registerReceiver(receiver, new IntentFilter(DownloadManager.ACTION_DOWNLOAD_COMPLETE));// 监听下载状态
}
private BroadcastReceiver receiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
//这里可以取得下载的id，这样就可以知道哪个文件下载完成了。适用与多个下载任务的监听
Log.v("intent", "" + intent.getLongExtra(DownloadManager.EXTRA_DOWNLOAD_ID, 0));
queryDownloadStatus();
}
};

private void queryDownloadStatus() {
DownloadManager.Query query = new DownloadManager.Query();
query.setFilterById(id);
Cursor c = downManager.query(query);
if (c.moveToFirst()) {
int status = c.getInt(c.getColumnIndex(DownloadManager.COLUMN_STATUS));
switch (status) {
case DownloadManager.STATUS_PAUSED:
Log.v("debug", "STATUS_PAUSED");
case DownloadManager.STATUS_PENDING:
Log.v("debug", "STATUS_PENDING");
case DownloadManager.STATUS_RUNNING:
//正在下载，不做任何事情
Log.v("debug", "下载中");
break;
case DownloadManager.STATUS_SUCCESSFUL:
//完成
showToast("下载完成");
try {
DownLoadMng.openFile2(getActivity(), absolutePath);
} catch (Exception e) {
e.printStackTrace();
DebugLogUtil.getInstance().Error("打开失败~" + e);
}
break;
case DownloadManager.STATUS_FAILED:
//清除已下载的内容，重新下载
showToast("下载失败");
//                    Log.v("debug", "STATUS_FAILED");
//                    downManager.remove(id);
//                    id.edit().clear().commit();
break;
}
}
}