很簡單，通過呼叫系統的intent，我們可以開啟各種檔案，不熟悉的朋友可以瞭解下action、datatype、uri的相關知識。

通用方法如下：

    public static Intent openFile(String filePath){  
      
            File file = new File(filePath);  
            if(!file.exists()) return null;  
            /* 取得副檔名 */  
            String end=file.getName().substring(file.getName().lastIndexOf(".") + 1,file.getName().length()).toLowerCase();   
            /* 依副檔名的型別決定MimeType */  
            if(end.equals("m4a")||end.equals("mp3")||end.equals("mid")||  
                    end.equals("xmf")||end.equals("ogg")||end.equals("wav")){  
                return getAudioFileIntent(filePath);  
            }else if(end.equals("3gp")||end.equals("mp4")){  
                return getAudioFileIntent(filePath);  
            }else if(end.equals("jpg")||end.equals("gif")||end.equals("png")||  
                    end.equals("jpeg")||end.equals("bmp")){  
                return getImageFileIntent(filePath);  
            }else if(end.equals("apk")){  
                return getApkFileIntent(filePath);  
            }else if(end.equals("ppt")){  
                return getPptFileIntent(filePath);  
            }else if(end.equals("xls")){  
                return getExcelFileIntent(filePath);  
            }else if(end.equals("doc")){  
                return getWordFileIntent(filePath);  
            }else if(end.equals("pdf")){  
                return getPdfFileIntent(filePath);  
            }else if(end.equals("chm")){  
                return getChmFileIntent(filePath);  
            }else if(end.equals("txt")){  
                return getTextFileIntent(filePath,false);  
            }else{  
                return getAllIntent(filePath);  
            }  
        }  
          
        //Android獲取一個用於開啟APK檔案的intent  
        public static Intent getAllIntent( String param ) {  
      
            Intent intent = new Intent();    
            intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);    
            intent.setAction(android.content.Intent.ACTION_VIEW);    
            Uri uri = Uri.fromFile(new File(param ));  
            intent.setDataAndType(uri,"*/*");   
            return intent;  
        }  
        //Android獲取一個用於開啟APK檔案的intent  
        public static Intent getApkFileIntent( String param ) {  
      
            Intent intent = new Intent();    
            intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);    
            intent.setAction(android.content.Intent.ACTION_VIEW);    
            Uri uri = Uri.fromFile(new File(param ));  
            intent.setDataAndType(uri,"application/vnd.android.package-archive");   
            return intent;  
        }  
      
        //Android獲取一個用於開啟VIDEO檔案的intent  
        public static Intent getVideoFileIntent( String param ) {  
      
            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(new File(param ));  
            intent.setDataAndType(uri, "video/*");  
            return intent;  
        }  
      
        //Android獲取一個用於開啟AUDIO檔案的intent  
        public static Intent getAudioFileIntent( String param ){  
      
            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(new File(param ));  
            intent.setDataAndType(uri, "audio/*");  
            return intent;  
        }  
      
        //Android獲取一個用於開啟Html檔案的intent     
        public static Intent getHtmlFileIntent( String param ){  
      
            Uri uri = Uri.parse(param ).buildUpon().encodedAuthority("com.android.htmlfileprovider").scheme("content").encodedPath(param ).build();  
            Intent intent = new Intent("android.intent.action.VIEW");  
            intent.setDataAndType(uri, "text/html");  
            return intent;  
        }  
      
        //Android獲取一個用於開啟圖片檔案的intent  
        public static Intent getImageFileIntent( String param ) {  
      
            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(new File(param ));  
            intent.setDataAndType(uri, "image/*");  
            return intent;  
        }  
      
        //Android獲取一個用於開啟PPT檔案的intent     
        public static Intent getPptFileIntent( String param ){    
      
            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(new File(param ));     
            intent.setDataAndType(uri, "application/vnd.ms-powerpoint");     
            return intent;     
        }     
      
        //Android獲取一個用於開啟Excel檔案的intent     
        public static Intent getExcelFileIntent( String param ){    
      
            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(new File(param ));     
            intent.setDataAndType(uri, "application/vnd.ms-excel");     
            return intent;     
        }     
      
        //Android獲取一個用於開啟Word檔案的intent     
        public static Intent getWordFileIntent( String param ){    
      
            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(new File(param ));     
            intent.setDataAndType(uri, "application/msword");     
            return intent;     
        }     
      
        //Android獲取一個用於開啟CHM檔案的intent     
        public static Intent getChmFileIntent( String param ){     
      
            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(new File(param ));     
            intent.setDataAndType(uri, "application/x-chm");     
            return intent;     
        }     
      
        //Android獲取一個用於開啟文字檔案的intent     
        public static Intent getTextFileIntent( String param, boolean paramBoolean){     
      
            Intent intent = new Intent("android.intent.action.VIEW");     
            intent.addCategory("android.intent.category.DEFAULT");     
            intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);     
            if (paramBoolean){     
                Uri uri1 = Uri.parse(param );     
                intent.setDataAndType(uri1, "text/plain");     
            }else{     
                Uri uri2 = Uri.fromFile(new File(param ));     
                intent.setDataAndType(uri2, "text/plain");     
            }     
            return intent;     
        }    
        //Android獲取一個用於開啟PDF檔案的intent     
        public static Intent getPdfFileIntent( String param ){     
      
            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(new File(param ));     
            intent.setDataAndType(uri, "application/pdf");     
            return intent;     
        }  

來自：http://blog.csdn.net/eclipsexys/article/details/39552501