Android第一次开机过程中出现问题抓log的一种方案

无法抓取log时将log写入到文件中的方法

public static void log(String tag, String str) {
    File file = null;
    try {
        file = new File("storage/sdcard0/log.txt");
        if(!file.exists()) {
            file.createNewFile();
        }
    } catch (IOException e1) {
        e1.printStackTrace();
    }
    if (file == null) {
        return;
    }
    FileWriter fw = null;
    try {
        fw = new FileWriter(file, true);
        fw.append("\n" + System.currentTimeMillis() + "\t" + tag + ",\t" + str);
    } catch (IOException e) {
        e.printStackTrace();
    } finally {
        if (fw != null) {
            try {
                fw.flush();
                fw.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
            fw = null;
        }
    }
}

模板

1.实现
public String LOG_FILE_NAME = "/mnt/sdcard/test_01.log";
 
private String getTimeString() {
    java.util.Date now= new Date();
    java.text.SimpleDateFormat formatter = new java.text.SimpleDateFormat("yy-MM-dd HH:mm:ss.sss");
    String rlt = formatter.format(now);
    return rlt;
}

private void saveLog( String log) {
    try {
        OutputStream os=new FileOutputStream(LOG_FILE_NAME, true);
        os.write(log.getBytes());
        os.flush();
        os.close();
    }catch(Exception ex){
        ex.printStackTrace();
    }
}

private void writeLog(String out) {
    String log = getTimeString()+":    "+out+"\n";
    saveLog(log);
}

2.测试
String str = "123456";
String log = str;
writeLog(log);