寫入/讀取字符串陣列到內部存儲器android

Question

我是android開發新手。目前，我正在開發一個簡單的應用程序，用於將字符串數組寫入並讀取到內部存儲器。

首先我們有一個數組，然後將其保存到存儲，那麼接下來的活動將加載它們，並將它們分配到陣列B.謝謝

Answer 1

如果您想保存yourObject緩存目錄，這是你怎麼做 -

String[] yourObject = {"a","b"}; 
    FileOutputStream stream = null; 

    /* you should declare private and final FILENAME_CITY */ 
    stream = ctx.openFileOutput(YourActivity.this.getCacheDir()+YOUR_CACHE_FILE_NAME, Context.MODE_PRIVATE); 
    ObjectOutputStream dout = new ObjectOutputStream(stream); 
    dout.writeObject(yourObject); 

    dout.flush(); 
    stream.getFD().sync(); 
    stream.close(); 

讀回 -

String[] readBack = null; 

FileInputStream stream = null; 

    /* you should declare private and final FILENAME_CITY */ 
    inStream = ctx.openFileInput(YourActivity.this.getCacheDir()+YOUR_CACHE_FILE_NAME); 
    ObjectInputStream din = new ObjectInputStream(inStream); 
    readBack = (String[]) din.readObject(yourObject); 

    din.flush(); 

    stream.close(); 

Answer 2

要寫入文件：

try { 
     File myFile = new File(Environment.getExternalStorageDirectory().getPath()+"/textfile.txt"); 
     myFile.createNewFile(); 
     FileOutputStream fOut = new FileOutputStream(myFile); 
     OutputStreamWriter myOutWriter = new OutputStreamWriter(fOut); 
     myOutWriter.write("replace this with your string"); 
     myOutWriter.close(); 
     fOut.close(); 
    } catch (Exception e) { 
     e.printStackTrace(); 
    } 

從文件中讀取：

String pathoffile; 
    String contents=""; 

    File myFile = new File(Environment.getExternalStorageDirectory().getPath()+"/textfile.txt"); 
    if(!myFile.exists()) 
    return ""; 
    try { 
     BufferedReader br = new BufferedReader(new FileReader(myFile)); 
     int c; 
     while ((c = br.read()) != -1) { 
      contents=contents+(char)c; 
     } 

    } 
    catch (IOException e) { 
     //You'll need to add proper error handling here 
     return ""; 
    } 

因此你會得到你的文件內容中的字符串「內容」

注意：您必須提供讀取和你的清單文件

寫權限

Answer 3

在Android上，您有幾個storage options。

如果要存儲一個字符串數組，使用SharedPreferences：

這post可能是一個解決方案。