Question

这是我的代码，我正在创建一个对话框，要求用户在取消时将应用程序发送到后台。我收到了这个错误：

11-26 14：12：01.197：E / ViewRootImpl（5472）：sendUserActionEvent（）mView == null

    mbtnimglogout.setOnClickListener(new OnClickListener(){

         @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
            closeapp();
            }});
}
void closeapp()
{
    new AlertDialog.Builder(this)
    .setIcon(android.R.drawable.ic_dialog_alert)
    .setTitle("Closing Dealer Form")
    .setMessage("Are you sure you want to send Application to Background?")
    .setPositiveButton("Yes", new DialogInterface.OnClickListener()
{
    @Override
    public void onClick(DialogInterface dialog, int which) {

   moveTaskToBack(true);
    //    finish();    
    }

})
.setNegativeButton("No", null)
.show();
}

Answer 1

.setNegativeButton(android.R.string.cancel, new DialogInterface.OnClickListener()
{
@Override
public void onClick(DialogInterface dialog, int which) {
   dialog.cancel();
}}).show();

Answer 2

您必须设置取消选项的监听器：

.setNegativeButton("No",new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog,int id) {
                        // if this button is clicked, just close
                        // the dialog box and do nothing
                        dialog.cancel();
                    }
                });

供参考，请参阅本教程Here

取消对话框时出错

2 个答案: