Java 为什么在缓存中创建文件时会出现异常

是否有与正在下载的文件同名的文件夹

在创建文件

PrintWriter

之前，您可以尝试使用以下方法清理该文件：

 File file = new File(mainAct.getCacheDir(), "Details.txt");
                try {
                    if(file.createNewFile()){   
                        Log.e("making file", " file made");
                    }
                PrintWriter write = new PrintWriter(file);
                String everyThing = s.name + "\n" +s.time + "\n" + s.onoff +"\n";
                for(boolean b : s.daysofweek){
                    if(b == true){
                        everyThing += "1";
                    }
                    else{
                        everyThing += "0";
                    }
                }
                everyThing += "\n";
                for(boolean b : s.sensors){
                    if(b == true){
                        everyThing += "1";
                    }
                    else{
                        everyThing += "0";
                    }
                }
                everyThing += "\n" + "End";
                write.print(everyThing);
                write.close();
            } catch (FileNotFoundException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
                Log.e("error occured", e.toString());
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } 

---

顺便说一句，s是一个具有公共变量的类。您在哪里得到异常？Stacktrace将非常有用。

s

变量是什么？公共类SoundDetails{public boolean[]sensors；//wifi gps 3g蓝牙飞机公共布尔[]daysofweek；公共字符串onoff=“”；公共字符串名称；公共字符串时间；公共SoundDetails（boolean[]sensors，boolean[]daysofweek，String-onoff，String-name，String-time）{this.sensors=sensors；this.daysofweek=daysofweek；this.onoff=onoff；this.name=name；this.time=time；}}}下面是我制作了一个名为s的实例的SoundDetail

 File file = new File(mainAct.getCacheDir(), "Details.txt");
                try {
                    if(file.createNewFile()){   
                        Log.e("making file", " file made");
                    }
                PrintWriter write = new PrintWriter(file);
                String everyThing = s.name + "\n" +s.time + "\n" + s.onoff +"\n";
                for(boolean b : s.daysofweek){
                    if(b == true){
                        everyThing += "1";
                    }
                    else{
                        everyThing += "0";
                    }
                }
                everyThing += "\n";
                for(boolean b : s.sensors){
                    if(b == true){
                        everyThing += "1";
                    }
                    else{
                        everyThing += "0";
                    }
                }
                everyThing += "\n" + "End";
                write.print(everyThing);
                write.close();
            } catch (FileNotFoundException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
                Log.e("error occured", e.toString());
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } 

new File(xxxx).delete();