本文出處：http://superonion.iteye.com/blog/1418467

我們知道，從一個Activity向另一個Activity傳遞數據，用Intent實現。而當一個浮在Activity之上的Dialog需要向該Activity傳遞數據時，應該怎么實現呢？接著上一篇文章：用Dialog創建帶箭頭的對話框。?
?????? 現在PopupDialog中聲明一個內部接口PriorityListener，接口中聲明一個回調函數refreshPriorityUI，用于在Dialog的監聽事件觸發后刷新Activity的UI顯示。然后在MainActivity中的Button點擊事件中實現這個接口并將其作為PopupDialog的構造函數的參數傳入，并實現refreshPriorityUI()方法。話不多說，直接上代碼——?
???? PopupDialog代碼：?

Java代碼??

public?class?PopupDialog?extends?Dialog?{??

??

????/**?

?????*?自定義Dialog監聽器?

?????*/??

????public?interface?PriorityListener?{??

????????/**?

?????????*?回調函數，用于在Dialog的監聽事件觸發后刷新Activity的UI顯示?

?????????*/??

????????public?void?refreshPriorityUI(String?string);??

????}??

??????

????private?PriorityListener?listener;??

????/**?

?????*?帶監聽器參數的構造函數?

?????*/??

????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("數據來自：上");?????????????????

????????????}??

????????});??

????}??

??

}??

???? MainActivity代碼：?

Java代碼??

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);?//?點擊Dialog之外的區域對話框消失??

????????????????Window?window?=?popupDialog.getWindow();??

????????????????WindowManager.LayoutParams?lp?=?window.getAttributes();??

????????????????lp.y?=?-64;?//?設置豎直方向的偏移量??

????????????????lp.dimAmount?=?0f;?//?彈出對話框的時候背景不變暗??

????????????????popupDialog.show();??

????????????}??

????????});??

????}??

}??

????? 最后效果：?

?

?????? 點擊“上”之后，MainActivity會調用refreshPriorityUI()方法：?

轉載于:https://www.cnblogs.com/a446276468/p/5310285.html

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