簡單處理原理：javascript
public void openFile0(File file){
String fileName = file.getAbsolutePath();
if(fileName.endsWith(".png")
|| fileName.endsWith(".jpg")
|| fileName.endsWith(".jpeg")
|| fileName.endsWith(".gif")){
Intent intent = new Intent();
intent.setAction(android.content.Intent.ACTION_VIEW);
intent.setDataAndType(Uri.fromFile(file), "image/*");
startActivity(intent);
}else if(fileName.endsWith(".mp4")
|| fileName.endsWith(".3gp")
|| fileName.endsWith(".avi")
|| fileName.endsWith(".flv")
|| fileName.endsWith(".wmv")
|| fileName.endsWith(".rmvb")
|| fileName.endsWith(".asf")
|| fileName.endsWith(".mkv")
|| fileName.endsWith(".mpg")){
Intent intent = new Intent();
intent.setAction(android.content.Intent.ACTION_VIEW);
intent.setDataAndType(Uri.fromFile(file), "video/*");
startActivity(intent);
}else if(fileName.endsWith(".mp3")
|| fileName.endsWith(".ogg")
|| fileName.endsWith(".ape")){
Intent intent = new Intent();
intent.setAction(android.content.Intent.ACTION_VIEW);
intent.setDataAndType(Uri.fromFile(file), "audio/*");
startActivity(intent);
}else if(fileName.endsWith(".apk")){
Intent intent = new Intent();
intent.setAction("android.intent.action.VIEW");
intent.addCategory("android.intent.category.DEFAULT");
intent.setDataAndType(Uri.fromFile(file), "application/vnd.android.package-archive");
startActivity(intent);
}
}
/**============================================================================**/
/**============================================================================**/html
通用性處理關鍵代碼:java
/**
* 調用可能打開文件的軟件打開文件
* @param file
*/
public void openFile(File file){
Intent intent = new Intent();
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
//設置intent的Action屬性
intent.setAction(Intent.ACTION_VIEW);
//獲取文件file的MIME類型
String type = getMIMEType(file);
//設置intent的data和Type屬性。
intent.setDataAndType(/*uri*/Uri.fromFile(file), type);
//跳轉
try {
startActivity(intent); // 可能無應用可打開, 避免程序崩潰
} catch (Exception e) {
Toast.makeText(MainActivity.this, "無應用可打開此文件", Toast.LENGTH_SHORT).show();
return;
}
}
/**
* 根據文件後綴名得到對應的MIME類型。
* @param file
*/
private String getMIMEType(File file) {
String type="*/*";
String fName = file.getName();
//獲取後綴名前的分隔符"."在fName中的位置。
int dotIndex = fName.lastIndexOf(".");
if(dotIndex < 0){
return type;
}
/* 獲取文件的後綴名*/
String end=fName.substring(dotIndex,fName.length()).toLowerCase(Locale.CHINA);
if(end=="")return type;
//在MIME和文件類型的匹配表中找到對應的MIME類型。
for(int i=0;i<FileFormatParams.MIME_MapTable.length;i++){
if(end.equals(FileFormatParams.MIME_MapTable[i][0]))
type = FileFormatParams.MIME_MapTable[i][1];
}
return type;
}
/**
* 文件後綴對應文件類型。
*
*/
public class FileFormatParams {
public static final String MIME_MapTable[][]={
//{後綴名，MIME類型}
{".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"},
{".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"},
{"", "*/*"}
};
}