java - 想要 Android 中的程序方法

Question

我希望主要 Activity 在执行对话框时等待。我在主要 Activity 中尝试了 this.wait(); ，但它给出了异常。这都是我的想法，所以我来这里寻求帮助:)。先感谢您任何帮助将不胜感激

public class MyDailogTestActivity extends Activity {
    /** Called when the activity is first created. */
    String Xvalue,Yvalue;
    TextView TextViewString;    
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        Button ShowDialog = (Button) findViewById(R.id.ShowDialog);
        TextViewString = (TextView) findViewById(R.id.ShowDialogText);      
        ShowDialog.setOnClickListener(new OnClickListener(){
            public void onClick(View arg0) {
                // TODO Auto-generated method stub
                Dialog MyDialog = MyDailog();
                MyDialog.show();
                // I WANT THIS TO EXECUTE AFTER BELOW MENTIONED CODE
                TextViewString.setText(Xvalue + Yvalue);
            }

        });
    }

    private Dialog MyDailog(){
        LayoutInflater factory = LayoutInflater.from(this);
        final View textEntryView = factory.inflate(R.layout.my_dialog, null);
        return new AlertDialog.Builder(MyDailogTestActivity.this)
        .setTitle("Enter Value")
        .setView(textEntryView)
        .setPositiveButton("Oky", new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int whichButton) {
                // THIS TO BE EXECUTE FIRST       
                Xvalue = "This ";
                Yvalue = "and That";                
                /* User clicked OK so do some stuff */
            }
        })
        .setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int whichButton) {
                /* User clicked cancel so do some stuff */
            }
        })
        .create();        
    }

}

这是该项目执行时的图像

http://imageshack.us/photo/my-images/220/11696639.jpg/在此图中，您可以看到 Hello World 没有变化。我试图反射(reflect) hello world TextView 中的变化。

http://imageshack.us/photo/my-images/338/27833231.jpg/现在在这张图片中。当我点击显示对话框时，它继续执行下一个代码 TextViewString.setText(Xvalue + Yvalue);其中显示值 null现在我希望它等待对话框完成代码，其中 Xvalue 和 Yvalue 将通过此代码获得值“This n That”

Xvalue = "This ";
Yvalue = "and That";  

Answer 1

移动此行:

TextViewString.setText(Xvalue + Yvalue);

像这样的积极按钮点击监听器:

public void onClick(DialogInterface dialog, int whichButton) {
    // THIS TO BE EXECUTE FIRST    
    Xvalue = "This ";
    Yvalue = "and That";                
    /* User clicked OK so do some stuff */
    TextViewString.setText(Xvalue + Yvalue);
}