AsyncTask中的FileInputStream錯誤

-1

我將一些代碼從普通方法移到了AsyncTask doInBackground方法中，除filereader之外，一切正常。我得到「上下文無法解決」。我試着把「context.getApplicationContext（）」放在一起，但這只是讓我「類型AlarmReceiver.backgroundputFTP的方法openFileInput（字符串）未定義」。任何人的想法請好嗎？AsyncTask中的FileInputStream錯誤

public void putFTP(Context context) 
    { 
     new backgroundputFTP().execute(); 
    } 

    private class backgroundputFTP extends AsyncTask< Void, Void,Void > 
    { 

     @Override 
     protected Void doInBackground(Void... params) 
     { 
    // 
// Push query result text file to FTP server 
// 

    FTPClient client = new FTPClient(); 
    FileInputStream fis = null; 
    Looper.prepare(); 

    try { 
     client.connect(ipAddress); 
     client.enterLocalPassiveMode(); 
     client.login(user, pass); 

     // 
     // Create an InputStream of the file to be uploaded 
     // 
     filename = "sdcardstats.txt"; 
     fis = context.getApplicationContext().openFileInput(filename);

來源

2012-09-05 Kevmeister

試試這個：

fis = YourActivity.this.getContext().openFileInput(filename);

YourActivity是在其中你有你的AsyncTask

來源

2012-09-05 16:16:44

感謝試圖幫助，但結果「的方法的getContext（）是未定義的類型AlarmReceiver」 – Kevmeister

@Kevmeister然後，定義在AlarmReceiver現場上下文mContext，做mContext =上下文您putFTP ，首先，然後使用AsyncTask中的mContext.openFileInput –

fis = context.getApplicationContext().openFileInput(filename);

你上哪兒去定義這方面Activity？嘗試這個。

public Context cContext ; 
public void putFTP(Context context) 
    { 
      cContext = context; 
     new backgroundputFTP().execute(); 
    } 

    private class backgroundputFTP extends AsyncTask< Void, Void,Void > 
    { 

     @Override 
     protected Void doInBackground(Void... params) 
     { 
    // 
// Push query result text file to FTP server 
// 

    FTPClient client = new FTPClient(); 
    FileInputStream fis = null; 
    Looper.prepare(); 

    try { 
     client.connect(ipAddress); 
     client.enterLocalPassiveMode(); 
     client.login(user, pass); 

     // 
     // Create an InputStream of the file to be uploaded 
     // 
     filename = "sdcardstats.txt"; 
     fis = cContext.openFileInput(filename);

來源

2012-09-05 18:00:31

AsyncTask中的FileInputStream錯誤

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