在进入android的下一页时显示警告对话框

Question

我有4个按钮选项，没有点击任何一个选项，我正在进入下一页，它应该显示一个警告对话框。

如果（btnOpt_1.equals（btnOpt_1）及;＆安培; btnOpt_2.equals（btnOpt_2）及;＆安培; btnOpt_3.equals（btnOpt_3）|| btnOpt_4.equals（btnOpt_4）|| btnOpt_5.equals（btnOpt_5））{< / p>

    AlertDialog.Builder alertDialog = new AlertDialog.Builder(Feedback.this);

    // Setting Dialog Title
    alertDialog.setTitle("OOPs");

    // Setting Dialog Message
    alertDialog.setMessage("You can't proceed without selecting");

    // Setting Icon to Dialog


    // Setting Positive "Yes" Button
    alertDialog.setPositiveButton("YES", new DialogInterface.OnClickListener() {
        public void onClick(DialogInterface dialog,int which) {

        // Write your code here to invoke YES event
        Toast.makeText(getApplicationContext(), "You clicked on YES", Toast.LENGTH_SHORT).show();
        dialog.cancel();
        }
    });

    // Setting Negative "NO" Button



    // Showing Alert Message
    alertDialog.show();
}

}

Answer 1

试试这个...在ui线程上运行你的警告对话框......

    if(btnOpt_1.equals(btnOpt_1)&&btnOpt_2.equals(btnOpt_2)&&btnOpt_3.equals(btnOpt_3)||btnOpt_4.equals(btnOpt_4)||btnOpt_5.equals(btnOpt_5)){

runOnUiThread(new Runnable() {

@override
public void run() {

if(!isFinishing()){
    AlertDialog.Builder alertDialog = new AlertDialog.Builder(Feedback.this);

    // Setting Dialog Title
    alertDialog.setTitle("OOPs");

    // Setting Dialog Message
    alertDialog.setMessage("You can't proceed without selecting");

    // Setting Icon to Dialog


    // Setting Positive "Yes" Button
    alertDialog.setPositiveButton("YES", new DialogInterface.OnClickListener() {
        public void onClick(DialogInterface dialog,int which) {

        // Write your code here to invoke YES event
        Toast.makeText(getApplicationContext(), "You clicked on YES", Toast.LENGTH_SHORT).show();
        dialog.cancel();
        }
    });

    // Setting Negative "NO" Button



    // Showing Alert Message
    alertDialog.show();
}
});
}