Android - 创建一个日志文件并在每个“事件”的新行中显示为 TextView？

Question

您好，我将姓名和数字记录到 android 中的文件中， 然后我打开日志文件，并在 TextView 中显示。 但我不能添加“换行符”（“\n”）所以它显示：

姓名1 nr1 名称2 nr2 Name3 nr3 名称4 nr4

我只在一长串中收到“一团糟”...

我尝试以下方法：

.....

addNameAndNrToLogg(stringName, stringNr); //call ..
.....

//save the logging
public void addNameAndNrToLogg(String Name, String Nr) {
            String content = Name + " " + Nr + " " + "\\\n"  + " ";
            content = content.replace("\\\n", System.getProperty("line.separator"));
                try {
                    OutputStreamWriter outputStreamWriter = new OutputStreamWriteropenFileOutput("logg.txt", Context.MODE_APPEND));
                    outputStreamWriter.write(content.toString());
                    outputStreamWriter.close();
                }
                catch (IOException e) {
                    Log.e("Exception", "File write failed: " + e.toString());              
                }

......

loggfil = getLogg(); //open the loggfile and save this to a string (just an ordinary open file...)
          TextView tv = new TextView(this);
          tv.setText(loggfil); // set content to loggfile 
          tv.setMovementMethod(new ScrollingMovementMethod());//make it scrollable
          setContentView(tv); //display it..


.....

//我也尝试添加\n、\n、\\n，但没有设置“换行”触发器..

//你有什么想法吗？ :-)

编辑： 我只想更精确： 我现在有，这不起作用:(:

....

public void addMatchToLogg(String Name, String Nr) {

String content = Name + " " + Nr + " " + System.getProperty("line.separator");

try {
OutputStreamWriter outputStreamWriter = new OutputStreamWriter(openFileOutput("logg.txt", Context.MODE_APPEND));
outputStreamWriter.write(content.toString());
outputStreamWriter.close();
}
catch (IOException e) {
Log.e("Exception", "File write failed: " + e.toString());              
}
....

// then in a other activity i open the logfile and put it in a textView:

loggfil = getLogg();
TextView tv = new TextView(this);
tv.setText(loggfil);

tv.setMovementMethod(new ScrollingMovementMethod());
setContentView(tv);

...
}
..

//then the getLogg():
public String getLogg() {
String loggBuffer = "emty logg";
try {
InputStream inputStream = openFileInput("logg.txt");
if ( inputStream != null ) {
InputStreamReader inputStreamReader = new InputStreamReader(inputStream);
BufferedReader bufferedReader = new BufferedReader(inputStreamReader);
String receiveString = "";
StringBuilder stringBuilder = new StringBuilder();
while ( (receiveString = bufferedReader.readLine()) != null ) {
stringBuilder.append(receiveString);
                }
inputStream.close();
loggBuffer = stringBuilder.toString();
            }

        }
catch (FileNotFoundException e) {
Log.e("login activity", "File not found: " + e.toString());
return loggBuffer;
        } catch (IOException e) {
Log.e("login activity", "Can not read file: " + e.toString());
return loggBuffer;
        }
return loggBuffer;
    }

结果： 姓名1 nr1 姓名2 nr2 姓名3 nr3 姓名4 nr4

而不是： 姓名1 nr1 名称2 nr2 Name3 nr3 Name4 nr4

在我拥有的 XML 中：

    <?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center_horizontal"
    android:orientation="vertical"
    android:paddingTop="20dp"
    android:scrollbarStyle="insideInset"
    android:scrollbars="vertical" >

        <TextView
            android:id="@+id/logg"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/emty"
            android:textSize="21sp" 
            android:maxLines="5"
        android:scrollbars="vertical"/>

</LinearLayout>

注意：当我从“模拟器”中取出 logg.txt 文件时，它是“错误的”/noNewLine：Name1 nr1 Name2 nr2 Name3 nr3 Name4 nr4

---

编辑只是为了测试和“评论”我测试了这个： 我测试了“强制字符串值”：

Name = "Event:"; 
Nr = "123"; 

然后：

String content = siteName + "_" + shortDate + "_" ; 
content = content + System.getProperty("line.separator"); 
//(yes I know i probably want to use stringbuilder, or is it a must here?..)

然后发送到logg，3次，结果：

事件：_123_事件：_123_事件：123

而不是：

事件：123

事件：123

事件：123

_________ :-(

Answer 1

试试这个

String content = Name + " " + Nr + " " + System.getProperty("line.separator") + " ";

Answer 2

经过大量测试后，我发现自己 像我以前那样在文件中添加新行是错误：

String content = Name + " " + Nr + " " + System.getProperty("line.separator");

（然后将其保存到文件中，然后读取它..）

字符串和文件可能有“2 个不同的 & unice line.separator”:-)

所以我的解决方案：

String content = siteName + " " + shortDate + "//n" ; 
//the "//n" is just a "MARKER" for later..
content = content.replaceAll("  ", " "); //just for nice things up..
//and save to file...
.....

//then when the textview want to display this:
// after the file have revived using getLogg()
        loggfil = getLogg();
//then i look after the MARKER: "//n" and replace this..
        loggfil = loggfil.replaceAll("//n", System.getProperty("line.separator"));

          TextView tv = new TextView(this);
          tv.setText(loggfil);
          tv.setMovementMethod(new ScrollingMovementMethod());
          setContentView(tv);  

结果是： 在文件中： Name1 Nr1//nName2 Nr2//nName3 Nr3//nName4 Nr4//n

在“保存的字符串loggfil”中 名称1 Nr1 名称2 Nr2 名称3 Nr3 名称4 Nr4

我很高兴，终于！！！ :-D

但是，仍然： 是否可以将“logg”写在最前面而不是最后一个？ 我用：

            try {
                    OutputStreamWriter outputStreamWriter = new OutputStreamWriter(openFileOutput("logg.txt", 
                            Context.MODE_APPEND));
                    outputStreamWriter.write(content.toString());
                    //outputStreamWriter.write("test", 0, 4);
                    outputStreamWriter.close();
                }
                catch (IOException e) {
                    Log.e("Exception", "File write failed: " + e.toString());              
                }