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最近做了个下载文件的功能, 下载简单....放到缓存里...除非用户有意愿留下来的,..才存在SD卡里,,..这是一个开发者节操问题...护住安卓手机口碑....也是护住行业......下载好文件....但是不是所有文件 俺们的app都能打开....这就需要其他应用打开的功能了.....话不多说,上代码
if(fileAttachment.getDisplayName().endsWith(".apk")){
startActivity(new File(path));
}else{
openFile(new File(path));
}如果是apk文件...让它去安装吧...
private void startActivity(File file) {
File apkFile = file;
Intent intent = new Intent(Intent.ACTION_VIEW);
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
//版本高于6.0，权限不一样
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
intent.setFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
Uri contentUri = FileProvider.getUriForFile(this, getApplicationContext().getPackageName() + ".provider", apkFile);
intent.setDataAndType(contentUri, "application/vnd.android.package-archive");
//兼容8.0
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
boolean hasInstallPermission = getPackageManager().canRequestPackageInstalls();
if (!hasInstallPermission) {
startInstallPermissionSettingActivity();
}
}
} else {
intent.setDataAndType(Uri.fromFile(apkFile), "application/vnd.android.package-archive");
}
startActivity(intent);
}
/**
* 跳转到设置-允许安装未知来源-页面
*/
@RequiresApi(api = Build.VERSION_CODES.O)
private void startInstallPermissionSettingActivity() {
//注意这个是8.0新API
Intent intent = new Intent(Settings.ACTION_MANAGE_UNKNOWN_APP_SOURCES);
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(intent);
}如果不是....我哪知道是什么文件子咯....只能列出手机里大多数应用....给用户自己选择了...是什么牛马...用户你自己智能选择吧
Demo演示一个txt文件调用其他应用打开....上图
那么上方法....将文件传到openFile方法里
private void openFile(File file) {
try {
Intent intent = new Intent();
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
//设置intent的Action属性
intent.setAction(Intent.ACTION_VIEW);
//获取文件file的MIME类型
String type = getMyMIMEType(file);
//设置intent的data和Type属性。android 7.0以上crash,改用provider
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
Uri fileUri = FileProvider.getUriForFile(this, getApplicationContext().getPackageName() + ".provider", file);//android 7.0以上
intent.setDataAndType(fileUri, type);
grantUriPermission(this, fileUri, intent);
} else {
intent.setDataAndType(Uri.fromFile(file), type);
}
//跳转
this.startActivity(intent);
} catch (Exception e) {
e.printStackTrace();
}
}
private static void grantUriPermission(Context context, Uri fileUri, Intent intent) {
List<ResolveInfo> resInfoList = context.getPackageManager().queryIntentActivities(intent, PackageManager.MATCH_DEFAULT_ONLY);
for (ResolveInfo resolveInfo : resInfoList) {
String packageName = resolveInfo.activityInfo.packageName;
context.grantUriPermission(packageName, fileUri, Intent.FLAG_GRANT_WRITE_URI_PERMISSION |
Intent.FLAG_GRANT_READ_URI_PERMISSION);
}
}
/**
* 根据文件后缀名获得对应的MIME类型。
*
* @param file
*/
private static String getMyMIMEType(File file) {
String type = "*/*";
String fName = file.getName();
//获取后缀名前的分隔符"."在fName中的位置。
int dotIndex = fName.lastIndexOf(".");
if (dotIndex < 0) {
return type;
}
/* 获取文件的后缀名 */
String end = fName.substring(dotIndex, fName.length()).toLowerCase();
if (end == "") return type;
//在MIME和文件类型的匹配表中找到对应的MIME类型。
for (int i = 0; i < MIME_MapTable.length; i++) { //MIME_MapTable??在这里你一定有疑问，这个MIME_MapTable是什么？
if (end.equals(MIME_MapTable[i][0]))
type = MIME_MapTable[i][1];
}
return type;
}这样就顺利完成啦....
private static final String[][] MIME_MapTable = {
//{后缀名， MIME类型}
{".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"},
{".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"},
{"", "*/*"}
};
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