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
代码如下 | 复制代码 |
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 privatePopupWindow popupWindow;
/** Called when the activity is first created. */ @Override publicvoidonCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_popupwindow_main); // 点击按钮弹出菜单 Button pop = (Button) findViewById(R.id.popBtn); pop.setOnClickListener(popClick); }
// 点击弹出左侧菜单的显示方式 OnClickListener popClick =newOnClickListener() { @Override publicvoidonClick(View v) { // TODO Auto-generated method stub 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() { // TODO Auto-generated method stub // 获取自定义布局文件activity_popupwindow_left.xml的视图 View popupWindow_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(View v, MotionEvent event) { // TODO Auto-generated method stub 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
代码如下 | 复制代码 |
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{ privatePopupWindow popupWindow; @Override protectedvoidonCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); setContentView(R.layout.activity_popupwindow_main);
findViewById(R.id.popBtn).setOnClickListener(newOnClickListener() { @Override publicvoidonClick(View v) { // TODO Auto-generated method stub // 获取自定义布局文件activity_popupwindow_left.xml的视图 View popupWindow_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(View v, MotionEvent event) { // TODO Auto-generated method stub if(popupWindow !=null&& popupWindow.isShowing()) { popupWindow.dismiss(); popupWindow =null; } returnfalse; } }); } });
} } |