触发按钮onclick后如何保持alertdialog打开？

Question

主题有点说明了所有..我正在向用户请求PIN码,如果他们输入了PIN码,请单击"确定"按钮并且PIN码不正确我想显示Toast但保持对话框打开.此刻它自动关闭..当然这是非常微不足道的事情要纠正但尚未找到答案.

谢谢..

Answer 1

您不需要创建自定义类.您可以为AlertDialog注册View.OnClickListener.此侦听器不会关闭AlertDialog.这里的诀窍是你需要在显示对话框后注册监听器,但它可以在OnShowListener中完成.您可以使用附件布尔变量来检查是否已经完成此操作,以便只执行一次:

    /*
     * Prepare the alert with a Builder.
     */
    AlertDialog.Builder b = new AlertDialog.Builder(this);

    b.setNegativeButton("Button", new DialogInterface.OnClickListener() {
        @Override
        public void onClick(DialogInterface dialog, int which) {}
    });
    this.alert = b.create();

    /*
     * Add an OnShowListener to change the OnClickListener on the
     * first time the alert is shown. Calling getButton() before
     * the alert is shown will return null. Then use a regular
     * View.OnClickListener for the button, which will not 
     * dismiss the AlertDialog after it has been called.
     */

    this.alertReady = false;
    alert.setOnShowListener(new DialogInterface.OnShowListener() {
        @Override
        public void onShow(DialogInterface dialog) {
            if (alertReady == false) {
                Button button = alert.getButton(DialogInterface.BUTTON_NEGATIVE);
                button.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {
                        //do something
                    }
                });
                alertReady = true;
            }
        }
    });

此解决方案的一部分由http://groups.google.com/group/android-developers/browse_thread/thread/fb56c8721b850124#提供

Answer 2

使用具有属性android:password ="true"按钮的EditText构建自定义对话框,然后手动设置onClick监听器按钮,并明确选择要在其中执行的操作.

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 
    xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:orientation="vertical">

    <EditText 
        android:layout_width="fill_parent" 
        android:layout_height="wrap_content" 
        android:minWidth="180dip" 
        android:digits="1234567890" 
        android:maxLength="4" 
        android:password="true"/>

    <LinearLayout 
        android:layout_width="fill_parent" 
        android:layout_height="wrap_content" 
        android:orientation="horizontal">

        <Button 
            android:id="@+id/Accept" 
            android:layout_width="fill_parent" 
            android:layout_height="wrap_content" 
            android:text="Accept"/>

    </LinearLayout> 
</LinearLayout> 

然后当你想要它弹出时:

final Dialog dialog = new Dialog(RealizarPago.this);
dialog.setContentView(R.layout.custom_dialog);
dialog.setTitle("PIN number:");
dialog.setCancelable(true);

Button button = (Button) dialog.findViewById(R.id.Accept);
button.setOnClickListener(new OnClickListener() {
@Override
    public void onClick(View v) {
        if(password_wrong){ 
          // showToast
        } else{
          dialog.dismiss();
          // other stuff to do
        }
    }
}); 

dialog.show();  

Answer 3

您可以按如下方式设置OnClickListener以使对话框保持打开状态:

public class MyDialog extends AlertDialog {
    public MyDialog(Context context) {
        super(context);
        setMessage("Hello");
        setButton(AlertDialog.BUTTON_POSITIVE, "Ok", (new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                // this will never be called
            }
        });
    }

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

        getButton(AlertDialog.BUTTON_POSITIVE).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (ok) {
                    // do something
                    dismiss();
                } else {
                    Toast.makeText(getContext(), "when you see this message, the dialog should stay open", Toast.LENGTH_SHORT).show();
                }
            }
        });
    }
}