如何在android中创建签约应用的崩溃日志文本文件

import android.util.Log;

import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;

public class CrashLogger {

    private static final String LOG_TAG = "CrashLogger";
    private static final String LOG_FILE_NAME = "crash_log.txt";

    public static void logException(Exception e) {
        try {
            File logFile = new File(getLogFileDirectory(), LOG_FILE_NAME);
            FileWriter fileWriter = new FileWriter(logFile, true);
            BufferedWriter bufferedWriter = new BufferedWriter(fileWriter);
            bufferedWriter.write(getCurrentDateTime() + ": ");
            e.printStackTrace(new PrintWriter(bufferedWriter));
            bufferedWriter.newLine();
            bufferedWriter.close();
        } catch (IOException ex) {
            Log.e(LOG_TAG, "Error writing crash log file: " + ex.getMessage());
        }
    }

    private static File getLogFileDirectory() {
        File logDir = new File(getAppDirectory(), "logs");
        if (!logDir.exists()) {
            logDir.mkdirs();
        }
        return logDir;
    }

    private static File getAppDirectory() {
        return new File(Environment.getExternalStorageDirectory(), "MyApp");
    }

    private static String getCurrentDateTime() {
        SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss", Locale.getDefault());
        return dateFormat.format(new Date());
    }
}

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />