Android:如何在自定义AlertDialog中检索Edittext.getText()？

Question

该主题解释了我正在追求的内容......我无法从android中的自定义视图中检索EditText.我得到的只是一个Nullpointer异常.:/我已经用注释标记了代码中的问题.ID:s是正确的,我的XML布局是一个包含两个EditText属性的简单RelativeLayout.显然我在这里遗漏了一些微不足道的东西,但我现在已经盯着代码差不多2个小时而没有解决这个问题,所以我想我会试一试.

protected void showLoginDialog() {
    AlertDialog.Builder builder = new AlertDialog.Builder(this);
    // Get the layout inflater
    LayoutInflater inflater = this.getLayoutInflater();

    // Inflate and set the layout for the dialog
    // Pass null as the parent view because its going in the dialog layout
    builder.setView(inflater.inflate(R.layout.activity_login, null))
    // Add action buttons
    .setPositiveButton(R.string.login, new DialogInterface.OnClickListener() {
        public void onClick(DialogInterface dialog, int id) {

            /* ERROR HERE! */
            EditText uName, passWord;
            uName = (EditText) findViewById(R.id.login_username);
            passWord = (EditText) findViewById(R.id.login_password);

            Log.i(TAG, uName.getText().toString() + " " + passWord.getText().toString());
            /* STOP */

            if(the_view.getSocketTask().isConnected) {
                the_view.getSocketTask().send_command("LOGIN ");
            } else {
                showToast("Not connected!");
            }
        }
    })
    .setNegativeButton(R.string.cancel,  new DialogInterface.OnClickListener() {
        public void onClick(DialogInterface dialog, int id) {
            dialog.dismiss();
        }
    });      
    builder.create().show();
}

编辑:

建议后,以下代码是一个工作的代码!再次感谢!

protected void showLoginDialog() {
    AlertDialog.Builder builder = new AlertDialog.Builder(this);
    // Get the layout inflater
    LayoutInflater inflater = this.getLayoutInflater();



    // Inflate and set the layout for the dialog
    // Pass null as the parent view because its going in the dialog layout
    builder.setView(inflater.inflate(R.layout.activity_login, null))
    // Add action buttons
    .setPositiveButton(R.string.login, new DialogInterface.OnClickListener() {
        public void onClick(DialogInterface dialog, int id) {
            Dialog f = (Dialog) dialog;
            /* ERROR HERE! */
            EditText uName, passWord;
            uName = (EditText) f.findViewById(R.id.login_username);
            passWord = (EditText) f.findViewById(R.id.login_password);

            Log.i(TAG, uName.getText().toString() + " " + passWord.getText().toString());
            /* STOP */

            if(the_view.getSocketTask().isConnected) {
                the_view.getSocketTask().send_command("LOGIN ");
            } else {
                showToast("Not connected!");
            }
        }
    })
    .setNegativeButton(R.string.cancel,  new DialogInterface.OnClickListener() {
        public void onClick(DialogInterface dialog, int id) {
            dialog.dismiss();
        }
    });      
    builder.create().show();
}

提前致谢!亚历克斯

Answer 1

将对话框转换为视图:

View v_iew=inflater.inflate(R.layout.activity_login, null)) ;
builder.setView(v_iew);

然后替换:

        uName = (EditText) findViewById(R.id.login_username); 
        passWord = (EditText) findViewById(R.id.login_password);

同

        uName = (EditText) v_iew.findViewById(R.id.login_username);
         passWord = (EditText) v_iew.findViewById(R.id.login_password);