Android(安卓)FileHelper 打开各种类型文件
16lz
2021-01-25
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：根据文件名后缀，判断出文件的类型，如PPT/TXT/PDF等类型，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 = "FileHelper"; public static void openFile(String filePath, Context context){ if(TextUtils.isEmpty(filePath)||null == context){ Log.e(TAG, "--openFile--filePath is empty or context is null, retun"); return; } File file = new File(filePath); if(null != file && file.exists()){ String fileName = file.getName(); Log.d(TAG, "--file is exist, filePath:"+filePath+"--fileName:"+fileName); String fileType = "*/*"; String end = fileName.substring(fileName.lastIndexOf(".") + 1, fileName.length()).toLowerCase(); if(end.equals("m4a")||end.equals("mp3")||end.equals("mid")|| end.equals("xmf")||end.equals("ogg")||end.equals("wav")){ fileType = "audio/*"; } else if(end.equals("jpg")||end.equals("gif")||end.equals("png")|| end.equals("jpeg")||end.equals("bmp")||end.equals(".pic")){ fileType = "image/*"; } else if(end.equals("txt")){ fileType = "text/plain"; } else if(end.equals("pdf")){ fileType = "application/pdf"; } else if(end.equals("doc")){ fileType = "application/msword"; } else if(end.equals("xls")){ fileType = "application/vnd.ms-excel"; } else if(end.equals("ppt")){ fileType = "application/vnd.ms-powerpoint"; } // 可以扩展自己需要的类型 Log.d(TAG, "--fileType:"+fileType); Intent intent = 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，要加上try catch，不然若不存在打开该类型的应用，则会crash
异常如下：
android.content.ActivityNotFoundException: No Activity found to handle Intent { act=android.intent.action.VIEW dat=file:///sdcard/1.ppt typ=application/vnd.ms-powerpoint flg=0x10000000 }- 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，用系统“图库”打开可能是黑的或者出现异常。
异常如下：
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String com.android.gallery3d.data.Path.getPrefix()' on a null object reference07-07 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 more07-07 16:08:20.702: W/ActivityManager(931): Force finishing activity 1 com.android.gallery3d/.app.GalleryActivity更多相关文章
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