android将日志语句写入sdcard

Question

我正在尝试将日志语句写入SD卡.我决定这样做的方法是通过Application Object在SD卡上创建一个文件.这样我就可以从应用程序的任何地方调用静态方法logToSdcard().

创建了包含文件夹"/ RR3log /",但我记录的每个语句都在其自己的文件中,名为"rr3LogFile.txt".所以我有多个rr3LogFile文件,每个文件包含一个staement.

如何将所有语句写入一个rr3LogFile文件？在此先感谢马特.

public class NfcScannerApplication extends Application{

    @Override
    public void onCreate() {
        super.onCreate();




        File storageDir = new File(Environment
                .getExternalStorageDirectory(), "/RR3log/");


        storageDir.mkdir();
        try {

            if(outfile == null){
            outfile=File.createTempFile("rr3LogFile", ".txt",storageDir);
            }
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }


    }





public static void logToSdcard(String tag, String statement){


        Log.e(TAG, "inside logtosdcard$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$");


                String state = android.os.Environment.getExternalStorageState();
                if(!state.equals(android.os.Environment.MEDIA_MOUNTED))  {
                    try {
                        throw new IOException("SD Card is not mounted.  It is " + state + ".");
                    } catch (IOException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    }
                }

                DateTime now = new DateTime();
                DateTimeFormatter fmt = DateTimeFormat.forPattern("d-MMM-Y H:mm");
                String dateStr = fmt.print(now);


                try{


                    FileOutputStream fOut = new FileOutputStream(outfile);
                    OutputStreamWriter myOutWriter =new OutputStreamWriter(fOut);
                    myOutWriter.append(dateStr + " " + tag + "     ");
                    myOutWriter.append(statement);
                    myOutWriter.append("\n");
                    myOutWriter.flush();
                    myOutWriter.close();
                    fOut.close();

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




    }


}

.

然后在应用程序中的任何位置的Activity中.

@Override
    protected void onResume() {
        super.onResume();
        Log.e(TAG, "inside entryactivity onResume");
        NfcScannerApplication.logToSdcard(TAG, "inside entryactivity onResume" );

Answer 1

在您的logToSdcard方法中,使用附加参数创建FileOutputStream:

FileOutputStream fOut = new FileOutputStream(outfile, true);

该trueparamters说,内容将被添加到该文件.另请参见FileOutputStream