每次在对话框中设置textView的结果，应用会崩溃。对话框是通过链接包含textView的xml，并且这个textView就是需要更新的。

AlertDialog.Builder alert = new AlertDialog.Builder(this); 
    LayoutInflater factory = LayoutInflater.from(this);        
    resultOne=(TextView)findViewById(R.id.resultOne); //resultone is a textview in xml dialog

    resultOne.setText("hello");  //this code is making the app close

    final View textEntryView = factory.inflate(R.layout.dialog, null);
    alert.setView(textEntryView);
    alert.show();

改变一下顺序可以访问View的子view，可能要用到textEntryView查询id

LayoutInflater factory = LayoutInflater.from(this);        
final View textEntryView = factory.inflate(R.layout.dialog, null);

resultOne=(TextView)textEntryView.findViewById(R.id.resultOne); //resultone is a textview in xml dialog

resultOne.setText("hello");
alert.setView(textEntryView);

alert.show();

调用顺序有问题，应该是调用

final View textEntryView = factory.inflate(R.layout.dialog, null);

resultOne=(TextView)textEntryView.findViewById(R.id.resultOne); //resultone is a textview in xml dialog

再去调用alert.setView(textEntryView);