在Android中動態更新txt文件

Question

我正試圖動態地寫入一個txt文件。我能夠創建並寫入文件1行。之後我想寫第二行。在我的代碼下面我檢查文件是否存在。如果它已經存在，我會寫入文件而不創建新文件（請參見下面的代碼）。但是，無論何時我嘗試第二次寫入，我都會收到此錯誤。

錯誤：

.IllegalArgumentException: File //sdcard//uiu_error_report.txt contains a path separator 

代碼：

String filename = "/sdcard/uiu_error_report.txt"; 

File myFile = new File(filename); 

if (myFile.createNewFile()) { 

    FileOutputStream fOut = new FileOutputStream(myFile); 
    OutputStreamWriter myOutWriter = new OutputStreamWriter(fOut); 
    myOutWriter.append("[" + dateFormatted + "," + module2 + "," + type2 + "," + message2 + "]"); 
    myOutWriter.close(); 
    fOut.close(); 

} else { 

    try { 
     OutputStreamWriter out = new OutputStreamWriter(context.openFileOutput(filename,countFileRows()+1)); 
     // write the contents on mySettings to the file 
     out.write("[" + dateFormatted + "," + module2 + "," + type2 + "," + message2 + "]"); 
     // close the file 
     out.close(); 

    // Do something if an IOException occurs. 
    } catch (java.io.IOException e) { 

    } 
} 

Answer 1

更好的辦法做到這一點....

try { 
    FileOutputStream fos = context.openFileOutput(filename, Context.MODE_APPEND | Context.MODE_WORLD_READABLE); 
    OutputStreamWriter myOutWriter = new OutputStreamWriter(fos); 
    myOutWriter.append("[" + dateFormatted + "," + module2 + "," + type2 + "," + message2 + "]"+"/n"); 
    // myOutWriter.close(); 

    myOutWriter.close(); 
} catch (Exception e) { 
    e.printStackTrace(); 
}