将值从活动传递到CustomDialog类

Question

您好，我想将我在活动中通过SharedPreferences保存的值"username“传递给CustomDialog类中的EditText。这意味着我想在我的CustomDialog类中使用EditText.settext (username)。有人能帮我做到这一点吗？

谢谢。

Main活动中的SharedPreference代码：

public class AndroidLogin extends Activity implements OnClickListener {
   public SharedPreferences mPrefs;
   ...

@Override     
protected void onPause() { 
    super.onPause(); 
    Editor e = mPrefs.edit();
    e.putString(USERNM, username);
    e.commit();
}
}

现在，我想在我的CustomDialog类中将"USERNM“值设置为EditText：

public class MyCustomForm extends Dialog {

  public SharedPreferences mPrefs;
    ...
    @Override
      public void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);

        setContentView(com.sencide.R.layout.inlogdialog);
        EditText userTest = (EditText)findViewById(R.id.txtUserName);

        mPrefs = getSharedPreferences("PREFS_NAME", this.MODE_PRIVATE); // does not work
        String text = mPrefs.getString("USERNM", ""); 
        userTest.setText(text);
  }
}

CustomDialog：

import android.app.Dialog;
...

public class MyCustomForm extends Dialog {

String mTextChange;
public SharedPreferences mPrefs;


public interface ReadyListener {
    public void ready(String user, String pass, boolean save);
}

private String usernm;
private String passwd;
private ReadyListener readyListener;


public MyCustomForm(Context context, String user, String pass, ReadyListener readyListener) {
    super(context);
    this.usernm = user;
    this.passwd = pass;
    this.readyListener = readyListener;
}


@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    setContentView(com.sencide.R.layout.inlogdialog);
    setTitle("Login:");
    EditText userTest = (EditText)findViewById(R.id.txtUserName);
    //mPrefs = getSharedPreferences("PREFS_NAME", this.MODE_PRIVATE);
    //String text = mPrefs.getString("USERNM", "");
    userTest.setText();

    Button buttonConfrim = (Button) findViewById(R.id.btnConfirm);
    buttonConfrim.setOnClickListener(new OKListener());

    Button buttonCancel = (Button) findViewById(R.id.btnCancel);
    buttonCancel.setOnClickListener(new CancelListener());


}


private class OKListener implements android.view.View.OnClickListener {

    public void onClick(View v) {
        EditText user = (EditText) findViewById(R.id.txtUserName);
        EditText pass = (EditText) findViewById(R.id.txtpass);
        CheckBox saveuser = (CheckBox) findViewById(R.id.saveuser);

        readyListener.ready(user.getText().toString(),pass.getText().toString(), saveuser.isChecked());

        MyCustomForm.this.dismiss();
    }
}


private class CancelListener implements android.view.View.OnClickListener {

    public void onClick(View v) {
        MyCustomForm.this.dismiss();
    }
}
}

在我的主要活动中编辑：

public void createDialog(Context context) { 
     SharedPreferences prefs = context.getSharedPreferences("mPrefs", Context.MODE_PRIVATE); 
     String user = prefs.getString("USERNM", ""); 
        new MyCustomForm(context, user, user, null); // where the class that is calling this is aa OnTextChangeListener 
    } 

下面是我显示对话框的方式：

public void getLoginData() throws Exception {

    if (checkInternetConnection() == true){
        MyCustomForm dialog = new MyCustomForm (this, "", "", new OnReadyListener());
        dialog.setContentView(R.layout.inlogdialog);
        dialog.show();       
    }

Answer 1

传递上下文(以及扩展视图)是一种not recommended。我建议为你的对话创建一个监听器，也许是类似于OnTextChangedListener#onChange(String)的东西。

在您的活动中创建侦听器，并将其传递到您的对话框。然后，当对话框完成时，调用listeners onChange(String)方法，该方法将被设置为向UI线程处理程序触发一个事件，以更新编辑文本。相反，您可以直接传递处理程序。

public class MyDialog exteds Dialog implements Dialog.OnClickListener {
    OnTextChangeListener mListener;
    String mTextChange;

    public MyDialog(OnTextChangeListener listener) {
        mListener = listener;
        // set up your stuff
        setOnClickListener(this);
    }

    ...

    public void onClick(DialogInterface dialog) {
        // Do what ever you need to do to get set mTextChange
        mListener.onChange(mTextChange);
    }

    public static interface OnTextChangeListener {
        void onChange(String textChange);
}

下面是你传递它的方法：

 public void createDialog(Context context) {
     SharedPreferences prefs = context.getSharedPreferences("MyPreferencesName", Context.MODE_PRIVATE);
     String user = prefs.getString("what_ever_string_you_want", "fall_back_user_name");
        new MyDialog(user, this); // where the class that is calling this is aa OnTextChangeListener
    }