在android中創建文本文件並保存數據

Question

我是編程android應用程序的新手。

在下面的代碼中，我想通過一些EditTexts從用戶獲取輸入，然後將它們保存到一個文件中。我使用android studio，在給出輸入後，我檢查了這個文件，它總是空的。我嘗試顯示內容並仍然沒有輸出。代碼有什麼問題？

請幫幫我。

public class user extends Activity { 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_user); 

    nextClick(); 
} 

public void nextClick() 
{ 
    final Context context = this; 
    Button next =(Button) findViewById(R.id.userNext); 
    next.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 
      try { 
       EditText e1 = (EditText) findViewById(R.id.name); 
       EditText e2 = (EditText) findViewById(R.id.designation); 
       EditText e3 = (EditText) findViewById(R.id.orgname); 
       EditText e4 = (EditText) findViewById(R.id.address); 
       EditText e5 = (EditText) findViewById(R.id.city); 
       EditText e6 = (EditText) findViewById(R.id.state); 
       EditText e7 = (EditText) findViewById(R.id.zip); 
       FileOutputStream fos = openFileOutput("data.txt", Context.MODE_WORLD_WRITEABLE); 
       OutputStreamWriter osw = new OutputStreamWriter(fos); 

       osw.write(e1.toString()); 

       fos.flush(); 
       fos.close(); 
      } 
      catch(Exception e) { 
      } 
      try 
        { 
       FileInputStream fis = new FileInputStream("data.txt"); 

       while(fis.read()!=-1) 
       { 
        System.out.println((char)fis.read()); 
       } 

      } 
      catch(Exception e) 
      { 

      } 
      Intent intent3 = new Intent(context,com.example.cheruvu.rs.user2.class); 
      startActivity(intent3); 
     } 
    }); 
} 

} 

Answer 1

你需要的getText（）從的EditText領域，當你寫入文件，如下圖所示

osw.write(e1.getText().toString());

Answer 2

這個

什麼。這將在手機上創建文件（不是SD卡）

File myFile = new File(Environment.getExternalStorageDirectory().getAbsolutePath() + File.separator + "MyFileName"); 
FileOutpuStream fos = new FileOutputStream(myFile); 

Answer 3

嘗試用這種替代你的代碼，看看它是否

public class user extends Activity { 

EditText e1; 
EditText e2; 
EditText e3; 
EditText e4; 
EditText e5; 
EditText e6; 
EditText e7; 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_user); 

    e1 = (EditText) findViewById(R.id.name); 
    e2 = (EditText) findViewById(R.id.designation); 
    e3 = (EditText) findViewById(R.id.orgname); 
    e4 = (EditText) findViewById(R.id.address); 
    e5 = (EditText) findViewById(R.id.city); 
    e6 = (EditText) findViewById(R.id.state); 
    e7 = (EditText) findViewById(R.id.zip); 

    nextClick(); 
} 

public void nextClick() 
{ 
    final Context context = this; 
    Button next =(Button) findViewById(R.id.userNext); 
    next.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 
      try { 

       FileOutputStream fos = openFileOutput("data.txt", Context.MODE_WORLD_WRITEABLE); 
       OutputStreamWriter osw = new OutputStreamWriter(fos); 

       osw.write(e1.getText().toString()); 

       fos.flush(); 
       fos.close(); 
      } 
      catch(Exception e) { 
      } 
      try 
        { 
       FileInputStream fis = new FileInputStream("data.txt"); 

       while(fis.read()!=-1) 
       { 
        System.out.println((char)fis.read()); 
       } 

      } 
      catch(Exception e) 
      { 

      } 
      Intent intent3 = new Intent(context,com.example.cheruvu.rs.user2.class); 
      startActivity(intent3); 
     } 
    }); 
} 

}