Android测试写入文本Log

写入本地SD卡：

    @SuppressLint("SdCardPath")
    public void writeFileSdcard(String fileName, String message) {
        try {
            FileOutputStream fout = new FileOutputStream(fileName);
            byte[] bytes = message.getBytes();
            fout.write(bytes);
            fout.close();
        }
        catch (Exception e) {
            e.printStackTrace();
        }
    } 

测试函数：

    	String message="";
    	String filename ="/sdcard/DevCv/Log/";
	filename += "Log_projectPoints" + ".txt";
	writeFileSdcard(filename,  message);