PopupDialog中声明一个内部接口PriorityListener，接口中声明一个回调函数refreshPriorityUI，用于在 Dialog的监听事件触发后刷新Activity的UI显示。然后在MainActivity中的Button点击事件中实现这个接口并将其作为 PopupDialog的构造函数的参数传入，并实现refreshPriorityUI()方法。话不多说，直接上代码——
PopupDialog代码：
public class PopupDialog extends Dialog {
/**
* 自定义Dialog监听器
*/
public interface PriorityListener {
/**
* 回调函数，用于在Dialog的监听事件触发后刷新Activity的UI显示
*/
public void refreshPriorityUI(String string);
}
private PriorityListener listener;
/**
* 带监听器参数的构造函数
*/
public PopupDialog(Context context, int theme, PriorityListener listener) {
super(context, theme);
this.listener = listener;
}
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.popup_dialog);
Button buttonUp = (Button) findViewById(R.id.btn_up);
buttonUp.setOnClickListener(new Button.OnClickListener() {
@Override
public void onClick(View v) {
dismiss();
listener.refreshPriorityUI("数据来自：上");
}
});
}
}MainActivity代码：
public class MainActivity extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Button button = (Button)findViewById(R.id.btn);
button.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
PopupDialog popupDialog = new PopupDialog(MainActivity.this, R.style.dialog, new PopupDialog.PriorityListener() {
@Override
public void refreshPriorityUI(String string) {
Toast.makeText(MainActivity.this, string, Toast.LENGTH_SHORT).show();
}
});
popupDialog.setCanceledOnTouchOutside(true); // 点击Dialog之外的区域对话框消失
Window window = popupDialog.getWindow();
WindowManager.LayoutParams lp = window.getAttributes();
lp.y = -; // 设置竖直方向的偏移量
lp.dimAmount = 0f; // 弹出对话框的时候背景不变暗
popupDialog.show();
}
});
}
}最后效果：
点击“上”之后，MainActivity会调用refreshPriorityUI()方法：