Android 中Popwindow弹出菜单的两种方法实例
Android中Popwindow弹出菜单的两种方法实例
1.popWindow就是对话框的一种方式!
此文讲解的android中对话框的一种使用方式,它叫popWindow。
2、popWindow的特性
Android的对话框有两种:PopupWindow和AlertDialog。它们的不同点在于:
AlertDialog的位置固定,而PopupWindow的位置可以随意。
AlertDialog是非阻塞线程的,而PopupWindow是阻塞线程的。
PopupWindow的位置按照有无偏移分,可以分为偏移和无偏移两种;按照参照物的不同,可以分为相对于某个控件(Anchor锚)和相对于父控件。
实例代码:
方法一的Activity
packagecom.app.test02; importandroid.app.Activity; importandroid.os.Bundle; importandroid.view.Gravity; importandroid.view.MotionEvent; importandroid.view.View; importandroid.view.View.OnClickListener; importandroid.view.View.OnTouchListener; importandroid.view.ViewGroup.LayoutParams; importandroid.widget.Button; importandroid.widget.PopupWindow; importandroid.widget.Toast; publicclassPopwindowLeftextendsActivity{ //声明PopupWindow对象的引用 privatePopupWindowpopupWindow; /**Calledwhentheactivityisfirstcreated.*/ @Override publicvoidonCreate(BundlesavedInstanceState){ super.onCreate(savedInstanceState); setContentView(R.layout.activity_popupwindow_main); //点击按钮弹出菜单 Buttonpop=(Button)findViewById(R.id.popBtn); pop.setOnClickListener(popClick); } //点击弹出左侧菜单的显示方式 OnClickListenerpopClick=newOnClickListener(){ @Override publicvoidonClick(Viewv){ //TODOAuto-generatedmethodstub getPopupWindow(); //这里是位置显示方式,在屏幕的左侧 popupWindow.showAtLocation(v,Gravity.LEFT,0,0); } }; /** *创建PopupWindow */ protectedvoidinitPopuptWindow(){ //TODOAuto-generatedmethodstub //获取自定义布局文件activity_popupwindow_left.xml的视图 ViewpopupWindow_view=getLayoutInflater().inflate(R.layout.activity_popupwindow_left,null, false); //创建PopupWindow实例,200,LayoutParams.MATCH_PARENT分别是宽度和高度 popupWindow=newPopupWindow(popupWindow_view,200,LayoutParams.MATCH_PARENT,true); //设置动画效果 popupWindow.setAnimationStyle(R.style.AnimationFade); //点击其他地方消失 popupWindow_view.setOnTouchListener(newOnTouchListener(){ @Override publicbooleanonTouch(Viewv,MotionEventevent){ //TODOAuto-generatedmethodstub if(popupWindow!=null&&popupWindow.isShowing()){ popupWindow.dismiss(); popupWindow=null; } returnfalse; } }); } /*** *获取PopupWindow实例 */ privatevoidgetPopupWindow(){ if(null!=popupWindow){ popupWindow.dismiss(); return; }else{ initPopuptWindow(); } } }
方法二的Activity
packagecom.app.test02; importandroid.app.Activity; importandroid.os.Bundle; importandroid.view.Gravity; importandroid.view.MotionEvent; importandroid.view.View; importandroid.view.View.OnClickListener; importandroid.view.View.OnTouchListener; importandroid.view.ViewGroup.LayoutParams; importandroid.widget.PopupWindow; publicclassPopwindowLeftNewextendsActivity{ privatePopupWindowpopupWindow; @Override protectedvoidonCreate(BundlesavedInstanceState){ //TODOAuto-generatedmethodstub super.onCreate(savedInstanceState); setContentView(R.layout.activity_popupwindow_main); findViewById(R.id.popBtn).setOnClickListener(newOnClickListener(){ @Override publicvoidonClick(Viewv){ //TODOAuto-generatedmethodstub //获取自定义布局文件activity_popupwindow_left.xml的视图 ViewpopupWindow_view=getLayoutInflater().inflate(R.layout.activity_popupwindow_left,null,false); //创建PopupWindow实例,200,LayoutParams.MATCH_PARENT分别是宽度和高度 popupWindow=newPopupWindow(popupWindow_view,200,LayoutParams.MATCH_PARENT,true); //设置动画效果 popupWindow.setAnimationStyle(R.style.AnimationFade); //这里是位置显示方式,在屏幕的左侧 popupWindow.showAtLocation(v,Gravity.LEFT,0,0); //点击其他地方消失 popupWindow_view.setOnTouchListener(newOnTouchListener(){ @Override publicbooleanonTouch(Viewv,MotionEventevent){ //TODOAuto-generatedmethodstub if(popupWindow!=null&&popupWindow.isShowing()){ popupWindow.dismiss(); popupWindow=null; } returnfalse; } }); } }); } }
感谢阅读,希望能帮助到大家,谢谢大家对本站的支持!