Question

我有一个编写Android程序的问题。我想保存用户输入的日志。但是，无论我做什么。我只能节省一行。当我按下按钮时，新数据将覆盖旧数据。如何保存数据而不覆盖数据？

这是我的代码mainactivity.java

public class MainActivity extends AppCompatActivity {
private EditText acc;
private Button login;
private Write write = new Write(MainActivity.this);

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
   login = (Button)findViewById(R.id.login);
 acc=(EditText)findViewById(R.id.acc);
 login.setOnClickListener(getDBRecord);

}

private Button.OnClickListener getDBRecord = new Button.OnClickListener() {
    public void onClick(View v) {
     String car_num=acc.getText().toString().toUpperCase();
           write.WriteFileExample(car_num);
    }
};

}

这是我的代码，write.java

public class Write {
private static Context context;

public Write(Context context) {
    this.context = context;
}

public static void WriteFileExample(String message) {
    FileOutputStream fop = null;
    File file;
    String content = message;

    try {
        File sdcard = Environment.getExternalStorageDirectory();

        file = new File(sdcard, "myLog.log"); //輸出檔案位置

        if (!file.exists()) { // 如果檔案不存在，建立檔案
            file.createNewFile();
        }
       fop =new  FileOutputStream(file);
        byte[] contentInBytes = content.getBytes();// 取的字串內容bytes

        fop.write(contentInBytes); //輸出

    } catch (IOException e) {} 
    finally {
        try {
            if (fop != null) 
                fop.close();
            } catch (IOException e) {}
    }
}
}

谢谢

Answer 1

如何使用FileWriter和BufferedWriter？您可以附加日志数据文本。

这是一个示例，我正在使用我当前的应用程序之一。

BufferedWriter bw = BufferedWriter(new FileWriter([LogFile path], [append text]));
bw.write(strLog);
bw.write("\n");
bw.flush();

您可以在FileWriter上设置附加文本选项（布尔值），以保留现有文本。

Answer 2

替换

ImageDataGenerator

使用

<script type="text/javascript">
 function radio() {
  var theMix = document.getElementById('mix');
  var theDrive = document.getElementById('drive');
  var theCountry = document.getElementById('country');
  if (document.getElementById("mix").checked) {
    document.querySelector("label[for=mix]").innerHTML = "https://wtmx.com/";

  } else if (document.getElementById("drive").checked) {

        document.querySelector("label[for=drive]").innerHTML = "https://wdrv.com/";

  } else if (document.getElementById("country").checked) {

        document.querySelector("label[for=country]").innerHTML = "https://us99.radio.com/";

  }

}
</script> 


<form>
  <p>List all the stations you listen to <br>
    <input type="checkbox" name="option1" value="A">The mix 101.9 <br>
    <input type="checkbox" name="option2" value="B">The Drive 97.1 <br>
    <input type="checkbox" name="option3" value="C">US 99 Country 99.5 <br>
  </p>

</form>



<form>
  <p>What is your favorite station?</p>
  <input type="radio" name="stations" id="mix" value="A">
  <label for="mix">The Mix 101.9</label><br>
  <input type="radio" name="stations" id="drive" value="B">
  <label for="drive">The Drive 97.1</label><br>
  <input type="radio" name="stations" id="country" value="C">
  <label for="country">US 99 Country 99.5 </label><br>
  <input type="button" value="Link To Favorite Station" onclick="radio()">
</form>

第二个参数是fop =new FileOutputStream(file);选项。通过将其设置为true，您将把新内容附加到旧内容上，而不是覆盖旧内容。

Android输出日志，但我无法输出多行

2 个答案: