AndroidFileHelper打开各种类型文件

使用Android系统支持的或者第三方APK打开各种类型的文件

原理&＃xff1a;根据文件名后缀&＃xff0c;判断出文件的类型&＃xff0c;如PPT/TXT/PDF等类型&＃xff0c;设置Intent的Data and Type

FileHelper源代码

package com.example.common;import java.io.File;import android.content.Context;
import android.content.Intent;
import android.net.Uri;
import android.text.TextUtils;
import android.util.Log;
import android.widget.Toast;public class FileHelper {private static final String TAG &＃61; "FileHelper";public static void openFile(String filePath, Context context){if(TextUtils.isEmpty(filePath)||null &＃61;&＃61; context){Log.e(TAG, "--openFile--filePath is empty or context is null, retun");return;}File file &＃61; new File(filePath);if(null !&＃61; file && file.exists()){String fileName &＃61; file.getName();Log.d(TAG, "--file is exist, filePath:"&＃43;filePath&＃43;"--fileName:"&＃43;fileName);String fileType &＃61; "*/*";String end &＃61; fileName.substring(fileName.lastIndexOf(".") &＃43; 1, fileName.length()).toLowerCase();if(end.equals("m4a")||end.equals("mp3")||end.equals("mid")|| end.equals("xmf")||end.equals("ogg")||end.equals("wav")){fileType &＃61; "audio/*";}else if(end.equals("jpg")||end.equals("gif")||end.equals("png")||end.equals("jpeg")||end.equals("bmp")||end.equals(".pic")){fileType &＃61; "image/*";}else if(end.equals("txt")){fileType &＃61; "text/plain";}else if(end.equals("pdf")){fileType &＃61; "application/pdf";}else if(end.equals("doc")){fileType &＃61; "application/msword";}else if(end.equals("xls")){fileType &＃61; "application/vnd.ms-excel";}else if(end.equals("ppt")){fileType &＃61; "application/vnd.ms-powerpoint";}// 可以扩展自己需要的类型Log.d(TAG, "--fileType:"&＃43;fileType);Intent intent &＃61; new Intent();intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);intent.setAction(android.content.Intent.ACTION_VIEW);intent.setDataAndType(Uri.fromFile(file), fileType);try {context.startActivity(intent);} catch (Exception e) {e.printStackTrace();Log.e(TAG, "--can not startActivity--");Toast.makeText(context, "暂不支持打开该文件", Toast.LENGTH_SHORT).show();}}}}


注意点
1. 在使用context.startActivity(intent);使&＃xff0c;要加上try catch&＃xff0c;不然若不存在打开该类型的应用&＃xff0c;则会crash
异常如下&＃xff1a;

android.content.ActivityNotFoundException: No Activity found to handle Intent { act&＃61;android.intent.action.VIEW dat&＃61;file:///sdcard/1.ppt typ&＃61;application/vnd.ms-powerpoint flg&＃61;0x10000000 }

1. 该工具类并未判断文件是否真的类型和后缀一致。如“.pic”结尾的文本文件&＃xff0c;用系统“图库”打开可能是黑的或者出现异常。
   异常如下&＃xff1a;

Caused by: java.lang.NullPointerException: Attempt to invoke virtual method &＃39;java.lang.String com.android.gallery3d.data.Path.getPrefix()&＃39; on a null object reference
07-07 16:08:20.672: E/AndroidRuntime(7816): at com.android.gallery3d.data.DataManager.getDefaultSetOf(DataManager.java:278)
07-07 16:08:20.672: E/AndroidRuntime(7816): at com.android.gallery3d.app.GalleryActivity.startViewAction(GalleryActivity.java:206)
07-07 16:08:20.672: E/AndroidRuntime(7816): at com.android.gallery3d.app.GalleryActivity.initializeByIntent(GalleryActivity.java:96)
07-07 16:08:20.672: E/AndroidRuntime(7816): at com.android.gallery3d.app.GalleryActivity.onCreate(GalleryActivity.java:73)
07-07 16:08:20.672: E/AndroidRuntime(7816): at android.app.Activity.performCreate(Activity.java:5990)
07-07 16:08:20.672: E/AndroidRuntime(7816): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1106)
07-07 16:08:20.672: E/AndroidRuntime(7816): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2278)
07-07 16:08:20.672: E/AndroidRuntime(7816): ... 10 more
07-07 16:08:20.702: W/ActivityManager(931): Force finishing activity 1 com.android.gallery3d/.app.GalleryActivity