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 = -64; // 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:
时间: 2024-11-07 22:41:59