创建csv会导致崩溃

时间：2014-07-25 12:05:47

标签： java android

所以我试图让我的Android应用程序创建一个CSV文件，但它似乎没有工作和崩溃。我已经测试了其余的代码并且它工作正常，但这似乎也导致了崩溃：/一个csv文件是在我的手机根目录上创建的，这是空的

更新了我的logcat 我的代码：

FileWriter writefile;
File root = Environment.getExternalStorageDirectory();
File MesurementFile= new File(root, "Data.csv");
Calendar c = Calendar.getInstance();
SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
String formattedDate = df.format(c.getTime());
String date = "Current date";
String a= "a size : ";
String b="b Size : ";

public void writeCsvHeader() throws IOException {
    String line = String.format("%s,%s,%s\n",date,a,b);
    writer = new FileWriter(csvfile);
    writer.write(line);
}

public void writeCsvData(long a, long b)throws IOException {
    String line = String.format("%f,%f,%f,%f\n", formattedDate ,a,b);
    writer.write(line);
    try {

        writer = new FileWriter(MesurementFile);
        writeCsvData(a,b);

    } catch (IOException e) {
        e.printStackTrace();
    }
}}

Stacktrace：

07-25 14:07:54.874: E/AndroidRuntime(9482): FATAL EXCEPTION: main
07-25 14:07:54.874: E/AndroidRuntime(9482): Process: com.extras, PID: 9482
07-25 14:07:54.874: E/AndroidRuntime(9482): java.lang.RuntimeException: Unable to start service com.extras.MyService@41e9c500 with Intent { cmp=com.extras/.MyService (has extras) }: java.util.IllegalFormatConversionException: %f can't format java.lang.String arguments
07-25 14:07:54.874: E/AndroidRuntime(9482):     at android.app.ActivityThread.handleServiceArgs(ActivityThread.java:2737)
07-25 14:07:54.874: E/AndroidRuntime(9482):     at android.app.ActivityThread.access$2100(ActivityThread.java:144)
07-25 14:07:54.874: E/AndroidRuntime(9482):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1302)
07-25 14:07:54.874: E/AndroidRuntime(9482):     at android.os.Handler.dispatchMessage(Handler.java:102)
07-25 14:07:54.874: E/AndroidRuntime(9482):     at android.os.Looper.loop(Looper.java:136)
07-25 14:07:54.874: E/AndroidRuntime(9482):     at android.app.ActivityThread.main(ActivityThread.java:5140)
07-25 14:07:54.874: E/AndroidRuntime(9482):     at java.lang.reflect.Method.invokeNative(Native Method)
07-25 14:07:54.874: E/AndroidRuntime(9482):     at java.lang.reflect.Method.invoke(Method.java:515)
07-25 14:07:54.874: E/AndroidRuntime(9482):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:795)
07-25 14:07:54.874: E/AndroidRuntime(9482):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:611)
07-25 14:07:54.874: E/AndroidRuntime(9482):     at dalvik.system.NativeStart.main(Native Method)
07-25 14:07:54.874: E/AndroidRuntime(9482): Caused by: java.util.IllegalFormatConversionException: %f can't format java.lang.String arguments
07-25 14:07:54.874: E/AndroidRuntime(9482):     at java.util.Formatter.badArgumentType(Formatter.java:1489)
07-25 14:07:54.874: E/AndroidRuntime(9482):     at java.util.Formatter.transformFromFloat(Formatter.java:2038)
07-25 14:07:54.874: E/AndroidRuntime(9482):     at java.util.Formatter.transform(Formatter.java:1465)
07-25 14:07:54.874: E/AndroidRuntime(9482):     at java.util.Formatter.doFormat(Formatter.java:1081)
07-25 14:07:54.874: E/AndroidRuntime(9482):     at java.util.Formatter.format(Formatter.java:1042)
07-25 14:07:54.874: E/AndroidRuntime(9482):     at java.util.Formatter.format(Formatter.java:1011)
07-25 14:07:54.874: E/AndroidRuntime(9482):     at java.lang.String.format(String.java:1999)
07-25 14:07:54.874: E/AndroidRuntime(9482):     at java.lang.String.format(String.java:1973)
07-25 14:07:54.874: E/AndroidRuntime(9482):     at com.extras.MyService.writeCsvData(MyService.java:83)
07-25 14:07:54.874: E/AndroidRuntime(9482):     at com.extras.MyService.onStartCommand(MyService.java:46)
07-25 14:07:54.874: E/AndroidRuntime(9482):     at android.app.ActivityThread.handleServiceArgs(ActivityThread.java:2720)
07-25 14:07:54.874: E/AndroidRuntime(9482):     ... 10 more





 07-25 14:24:25.994: E/AndroidRuntime(13219): FATAL EXCEPTION: main
    07-25 14:24:25.994: E/AndroidRuntime(13219): Process: com.extras, PID: 13219
    07-25 14:24:25.994: E/AndroidRuntime(13219): java.lang.StackOverflowError
    07-25 14:24:25.994: E/AndroidRuntime(13219):    at     java.lang.Thread.currentThread(Thread.java:470)
    07-25 14:24:25.994: E/AndroidRuntime(13219):    at java.lang.ThreadLocal.get(ThreadLocal.java:53)
    07-25 14:24:25.994: E/AndroidRuntime(13219):    at java.util.Formatter.getDecimalFormat(Formatter.java:594)
07-25 14:24:25.994: E/AndroidRuntime(13219):    at     java.util.Formatter.transformF(Formatter.java:2215)
07-25 14:24:25.994: E/AndroidRuntime(13219):    at java.util.Formatter.transformFromFloat(Formatter.java:2055)
07-25 14:24:25.994: E/AndroidRuntime(13219):    at java.util.Formatter.transform(Formatter.java:1465)
07-25 14:24:25.994: E/AndroidRuntime(13219):    at java.util.Formatter.doFormat(Formatter.java:1081)
07-25 14:24:25.994: E/AndroidRuntime(13219):    at java.util.Formatter.format(Formatter.java:1042)
07-25 14:24:25.994: E/AndroidRuntime(13219):    at java.util.Formatter.format(Formatter.java:1011)
07-25 14:24:25.994: E/AndroidRuntime(13219):    at java.lang.String.format(String.java:1999)
07-25 14:24:25.994: E/AndroidRuntime(13219):    at java.lang.String.format(String.java:1973)
07-25 14:24:25.994: E/AndroidRuntime(13219):    at com.extras.MyService.writeCsvData(MyService.java:83)
07-25 14:24:25.994: E/AndroidRuntime(13219):    at com.extras.MyService.writeCsvData(MyService.java:88)
07-25 14:24:25.994: E/AndroidRuntime(13219):    at com.extras.MyService.writeCsvData(MyService.java:88)
07-25 14:24:25.994: E/AndroidRuntime(13219):    at com.extras.MyService.writeCsvData(MyService.java:88)
07-25 14:24:25.994: E/AndroidRuntime(13219):    at com.extras.MyService.writeCsvData(MyService.java:88)
07-25 14:24:25.994: E/AndroidRuntime(13219):    at com.extras.MyService.writeCsvData(MyService.java:88)
07-25 14:24:25.994: E/AndroidRuntime(13219):    at com.extras.MyService.writeCsvData(MyService.java:88)
07-25 14:24:25.994: E/AndroidRuntime(13219):    at com.extras.MyService.writeCsvData(MyService.java:88)
07-25 14:24:25.994: E/AndroidRuntime(13219):    at com.extras.MyService.writeCsvData(MyService.java:88)
07-25 14:24:25.994: E/AndroidRuntime(13219):    at com.extras.MyService.writeCsvData(MyService.java:88)
07-25 14:24:25.994: E/AndroidRuntime(13219):    at com.extras.MyService.writeCsvData(MyService.java:88)
07-25 14:24:25.994: E/AndroidRuntime(13219):    at com.extras.MyService.writeCsvData(MyService.java:88)
07-25 14:24:25.994: E/AndroidRuntime(13219):    at com.extras.MyService.writeCsvData(MyService.java:88)
07-25 14:24:25.994: E/AndroidRuntime(13219):    at com.extras.MyService.writeCsvData(MyService.java:88)
07-25 14:24:25.994: E/AndroidRuntime(13219):    at com.extras.MyService.writeCsvData(MyService.java:88)
07-25 14:24:25.994: E/AndroidRuntime(13219):    at com.extras.MyService.writeCsvData(MyService.java:88)
07-25 14:24:25.994: E/AndroidRuntime(13219):    at com.extras.MyService.writeCsvData(MyService.java:88)
07-25 14:24:25.994: E/AndroidRuntime(13219):    at com.extras.MyService.writeCsvData(MyService.java:88)
07-25 14:24:25.994: E/AndroidRuntime(13219):    at com.extras.MyService.writeCsvData(MyService.java:88)
07-25 14:24:25.994: E/AndroidRuntime(13219):    at com.extras.MyService.writeCsvData(MyService.java:88)
07-25 14:24:25.994: E/AndroidRuntime(13219):    at com.extras.MyService.writeCsvData(MyService.java:88)
07-25 14:24:25.994: E/AndroidRuntime(13219):    at com.extras.MyService.writeCsvData(MyService.java:88)
07-25 14:24:25.994: E/AndroidRuntime(13219):    at com.extras.MyService.writeCsvData(MyService.java:88)
07-25 14:24:25.994: E/AndroidRuntime(13219):    at com.extras.MyService.writeCsvData(MyService.java:88)
07-25 14:24:25.994: E/AndroidRuntime(13219):    at com.extras.MyService.writeCsvData(MyService.java:88)
07-25 14:24:25.994: E/AndroidRuntime(13219):    at com.extras.MyService.writeCsvData(MyService.java:88)
07-25 14:24:25.994: E/AndroidRuntime(13219):    at com.extras.MyService.writeCsvData(MyService.java:88)
07-25 14:24:25.994: E/AndroidRuntime(13219):    at com.extras.MyService.writeCsvData(MyService.java:88)
07-25 14:24:25.994: E/AndroidRuntime(13219):    at com.extras.MyService.writeCsvData(MyService.java:88)
07-25 14:24:25.994: E/AndroidRuntime(13219):    at com.extras.MyService.writeCsvData(MyService.java:88)
07-25 14:24:25.994: E/AndroidRuntime(13219):    at com.extras.MyService.writeCsvData(MyService.java:88)
07-25 14:24:25.994: E/AndroidRuntime(13219):    at com.extras.MyService.writeCsvData(MyService.java:88)
07-25 14:24:25.994: E/AndroidRuntime(13219):    at com.extras.MyService.writeCsvData(MyService.java:88)
07-25 14:24:25.994: E/AndroidRuntime(13219):    at com.extras.MyService.writeCsvData(MyService.java:88)
07-25 14:24:25.994: E/AndroidRuntime(13219):    at com.extras.MyService.writeCsvData(MyService.java:88)
07-25 14:24:25.994: E/AndroidRuntime(13219):    at com.extras.MyService.writeCsvData(MyService.java:88)
07-25 14:24:25.994: E/AndroidRuntime(13219):    at com.extras.MyService.writeCsvData(MyService.java:88)
07-25 14:24:25.994: E/AndroidRuntime(13219):    at com.extras.MyService.writeCsvData(MyService.java:88)
07-25 14:24:25.994: E/AndroidRuntime(13219):    at com.extras.MyService.writeCsvData(MyService.java:88)
07-25 14:24:25.994: E/AndroidRuntime(13219):    at com.extras.MyService.writeCsvData(MyService.java:88)
07-25 14:24:25.994: E/AndroidRuntime(13219):    at com.extras.MyService.writeCsvData(MyService.java:88)
07-25 14:24:25.994: E/AndroidRuntime(13219):    at com.extras.MyService.writeCsvData(MyService.java:88)
07-25 14:24:25.994: E/AndroidRuntime(13219):    at com.extras.MyService.writeCsvData(MyService.java:88)
07-25 14:24:25.994: E/AndroidRuntime(13219):    at com.extras.MyService.writeCsvData(MyService.java:88)
07-25 14:24:25.994: E/AndroidRuntime(13219):    at com.extras.MyService.writeCsvData(MyService.java:88)
07-25 14:24:25.994: E/AndroidRuntime(13219):    at com.extras.MyService.writeCsvData(MyService.java:88)
07-25 14:24:25.994: E/AndroidRuntime(13219):    at com.extras.MyService.writeCsvData(MyService.java:88)
07-25 14:24:25.994: E/AndroidRuntime(13219):    at com.extras.MyService.writeCsvData(MyService.java:88)
07-25 14:24:25.994: E/AndroidRuntime(13219):    at com.extras.MyService.writeCsvData(MyService.java:88)
07-25 14:24:25.994: E/AndroidRuntime(13219):    at com.extras.MyService.writeCsvData(MyService.java:88)
07-25 14:24:25.994: E/AndroidRuntime(13219):    at com.extras.MyService.writeCsvData(MyService.java:88)
07-25 14:24:25.994: E/AndroidRuntime(13219):    at com.extras.MyService.writeCsvData(MyService.java:88)
07-25 14:24:25.994: E/AndroidRuntime(13219):    at com.extras.MyService.writeCsvData(MyService.java:88)
07-25 14:24:25.994: E/AndroidRuntime(13219):    at com.extras.MyService.writeCsvData(MyService.java:88)
07-25 14:24:25.994: E/AndroidRuntime(13219):    at com.extras.MyService.writeCsvData(MyService.java:88)
07-25 14:24:25.994: E/AndroidRuntime(13219):    at com.extras.MyService.writeCsvData(MyService.java:88)
07-25 14:24:25.994: E/AndroidRuntime(13219):    at com.extras.MyService.writeCsvData(MyService.java:88)
07-25 14:24:25.994: E/AndroidRuntime(13219):    at com.extras.MyService.writeCsvData(MyService.java:88)
07-25 14:24:25.994: E/AndroidRuntime(13219):    at com.extras.MyService.writeCsvData(MyService.java:88)
07-25 14:24:25.994: E/AndroidRuntime(13219):    at com.extras.MyService.writeCsvData(MyService.java:88)
07-25 14:24:25.994: E/AndroidRuntime(13219):    at com.extras.MyService.writ

3 个答案:

答案 0 :(得分：0)

您正在使用％f格式化字符串，因此它正在抱怨。还有四个％f，你传递3个值（formattedDate，a，b）

String line = String.format("%f,%f,%f,%f\n", formattedDate ,a,b);

答案 1 :(得分：0)

  

％f无法格式化java.lang.String参数

基本上说出你需要的一切。您尝试编写字符串，但您的占位符只接受%f float（如果我没记错的话）。

因此，只需检查您在此处拥有的参数类型，并将%f更改为%s或更改参数类型。

// at least one %f is wrong here...
String line = String.format("%f,%f,%f,%f\n", formattedDate ,a,b);

更新

您现在看到StackOverflowException因为您在同一方法中调用自己的方法。这是一个无限循环，通常称为＃34;递归＆＃34;。递归需要有一些明确定义和防弹的结束条件。堆栈大小是递归可以执行的循环的限制，超出了该限制。

public void writeCsvData(long a, long b)throws IOException {
    String line = String.format("%f,%f,%f,%f\n", formattedDate ,a,b);
    writer.write(line);
    try {

        writer = new FileWriter(MesurementFile);
        writeCsvData(a,b); // THIS cause the loop

    } catch (IOException e) {
        e.printStackTrace();
    }
}

您需要找到一种方法来只写一行并在循环中重复调用它。要了解如何做到这一点取决于你：）

答案 2 :(得分：0)

  

引起：java.util.IllegalFormatConversionException: %f无法格式化java.lang.String个参数

String line = String.format("%f,%f,%f,%f\n", formattedDate ,a,b);

我在这里看到三个问题：

  1. 您在传递%f值（无浮点）时使用long（浮点格式化）
  2. 您的格式需要四个参数，您只传递三个参数。
  3. formattedDate是一个String，它不能与%f格式化，用于浮点数。
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