Android编程开发之打开文件的Intent及使用方法
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2023-11-16 16:53:58
本文实例讲述了android编程开发之打开文件的intent及使用方法。分享给大家供大家参考，具体如下：
在写文件管理系统时会用到各种打开不同格式的文件的需求，由于and...
本文实例讲述了android编程开发之打开文件的intent及使用方法。分享给大家供大家参考，具体如下：
在写文件管理系统时会用到各种打开不同格式的文件的需求，由于android系统默认内置了一些可以打开的系统应用，但还是不能满足需求，比如打开视频文件、word等，需要安装相应的播放软件才可以使用，这时程序会通过intent查找可以使用的软件实现通过代码打开一个文件需要2部分，一部分是要获取到不同文件的后缀，以便根据需求匹配相应的intent，另一个就是不同格式的文件打开的intent不同
1、在values目录下定义后缀数组文件fileendings
<?xml version="1.0" encoding="utf-8"?> <resources> <array name="fileendingimage"> <item>.png</item> <item>.gif</item> <item>.jpg</item> <item>.jpeg</item> <item>.bmp</item> </array> <array name="fileendingaudio"> <item>.mp3</item> <item>.wav</item> <item>.ogg</item> <item>.midi</item> </array> <array name="fileendingvideo"> <item>.mp4</item> <item>.rmvb</item> <item>.avi</item> <item>.flv</item> </array> <array name="fileendingpackage"> <item>.jar</item> <item>.zip</item> <item>.rar</item> <item>.gz</item> <item>.apk</item> <item>.img</item> </array> <array name="fileendingwebtext"> <item>.htm</item> <item>.html</item> <item>.php</item> <item>.jsp</item> </array> <array name="fileendingtext"> <item>.txt</item> <item>.java</item> <item>.c</item> <item>.cpp</item> <item>.py</item> <item>.xml</item> <item>.json</item> <item>.log</item> </array> <array name="fileendingword"> <item>.doc</item> <item>.docx</item> </array> <array name="fileendingexcel"> <item>.xls</item> <item>.xlsx</item> </array> <array name="fileendingppt"> <item>.ppt</item> <item>.pptx</item> </array> <array name="fileendingpdf"> <item>.p<?xml version="1.0" encoding="utf-8"?> <resources> <array name="fileendingimage"> <item>.png</item> <item>.gif</item> <item>.jpg</item> <item>.jpeg</item> <item>.bmp</item> </array> <array name="fileendingaudio"> <item>.mp3</item> <item>.wav</item> <item>.ogg</item> <item>.midi</item> </array> <array name="fileendingvideo"> <item>.mp4</item> <item>.rmvb</item> <item>.avi</item> <item>.flv</item> </array> <array name="fileendingpackage"> <item>.jar</item> <item>.zip</item> <item>.rar</item> <item>.gz</item> <item>.apk</item> <item>.img</item> </array> <array name="fileendingwebtext"> <item>.htm</item> <item>.html</item> <item>.php</item> <item>.jsp</item> </array> <array name="fileendingtext"> <item>.txt</item> <item>.java</item> <item>.c</item> <item>.cpp</item> <item>.py</item> <item>.xml</item> <item>.json</item> <item>.log</item> </array> <array name="fileendingword"> <item>.doc</item> <item>.docx</item> </array> <array name="fileendingexcel"> <item>.xls</item> <item>.xlsx</item> </array> <array name="fileendingppt"> <item>.ppt</item> <item>.pptx</item> </array> <array name="fileendingpdf"> <item>.pdf</item> </array> </resources>df</item> </array> </resources>
2、定义openfiles工具类，只需传输file参数即可，然后通过返回的intent打开文件
public class openfiles {
//android获取一个用于打开html文件的intent
public static intent gethtmlfileintent(file file)
{
uri uri = uri.parse(file.tostring()).buildupon().encodedauthority("com.android.htmlfileprovider").scheme("content").encodedpath(file.tostring()).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(file file)
{
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(file);
intent.setdataandtype(uri, "image/*");
return intent;
}
//android获取一个用于打开pdf文件的intent
public static intent getpdffileintent(file file)
{
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(file);
intent.setdataandtype(uri, "application/pdf");
return intent;
}
//android获取一个用于打开文本文件的intent
public static intent gettextfileintent(file file)
{
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(file);
intent.setdataandtype(uri, "text/plain");
return intent;
}
//android获取一个用于打开音频文件的intent
public static intent getaudiofileintent(file file)
{
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(file);
intent.setdataandtype(uri, "audio/*");
return intent;
}
//android获取一个用于打开视频文件的intent
public static intent getvideofileintent(file file)
{
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(file);
intent.setdataandtype(uri, "video/*");
return intent;
}
//android获取一个用于打开chm文件的intent
public static intent getchmfileintent(file file)
{
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(file);
intent.setdataandtype(uri, "application/x-chm");
return intent;
}
//android获取一个用于打开word文件的intent
public static intent getwordfileintent(file file)
{
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(file);
intent.setdataandtype(uri, "application/msword");
return intent;
}
//android获取一个用于打开excel文件的intent
public static intent getexcelfileintent(file file)
{
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(file);
intent.setdataandtype(uri, "application/vnd.ms-excel");
return intent;
}
//android获取一个用于打开ppt文件的intent
public static intent getpptfileintent(file file)
{
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(file);
intent.setdataandtype(uri, "application/vnd.ms-powerpoint");
return intent;
}
//android获取一个用于打开apk文件的intent
public static intent getapkfileintent(file file)
{
intent intent = new intent();
intent.addflags(intent.flag_activity_new_task);
intent.setaction(android.content.intent.action_view);
intent.setdataandtype(uri.fromfile(file), "application/vnd.android.package-archive");
return intent;
}
}
3、定义用于检查要打开的文件的后缀是否在遍历后缀数组中
private boolean checkendswithinstringarray(string checkitsend,
string[] fileendings){
for(string aend : fileendings){
if(checkitsend.endswith(aend))
return true;
}
return false;
}
4、通过调用openfiles类返回的intent，打开相应的文件
if(currentpath!=null&¤tpath.isfile())
{
string filename = currentpath.tostring();
intent intent;
if(checkendswithinstringarray(filename, getresources().
getstringarray(r.array.fileendingimage))){
intent = openfiles.getimagefileintent(currentpath);
startactivity(intent);
}else if(checkendswithinstringarray(filename, getresources().
getstringarray(r.array.fileendingwebtext))){
intent = openfiles.gethtmlfileintent(currentpath);
startactivity(intent);
}else if(checkendswithinstringarray(filename, getresources().
getstringarray(r.array.fileendingpackage))){
intent = openfiles.getapkfileintent(currentpath);
startactivity(intent);
}else if(checkendswithinstringarray(filename, getresources().
getstringarray(r.array.fileendingaudio))){
intent = openfiles.getaudiofileintent(currentpath);
startactivity(intent);
}else if(checkendswithinstringarray(filename, getresources().
getstringarray(r.array.fileendingvideo))){
intent = openfiles.getvideofileintent(currentpath);
startactivity(intent);
}else if(checkendswithinstringarray(filename, getresources().
getstringarray(r.array.fileendingtext))){
intent = openfiles.gettextfileintent(currentpath);
startactivity(intent);
}else if(checkendswithinstringarray(filename, getresources().
getstringarray(r.array.fileendingpdf))){
intent = openfiles.getpdffileintent(currentpath);
startactivity(intent);
}else if(checkendswithinstringarray(filename, getresources().
getstringarray(r.array.fileendingword))){
intent = openfiles.getwordfileintent(currentpath);
startactivity(intent);
}else if(checkendswithinstringarray(filename, getresources().
getstringarray(r.array.fileendingexcel))){
intent = openfiles.getexcelfileintent(currentpath);
startactivity(intent);
}else if(checkendswithinstringarray(filename, getresources().
getstringarray(r.array.fileendingppt))){
intent = openfiles.getpptfileintent(currentpath);
startactivity(intent);
}else
{
showmessage("无法打开，请安装相应的软件！");
}
}else
{
showmessage("对不起，这不是文件！");
}
希望本文所述对大家android程序设计有所帮助。