PopupWindow实例解析
隔壁小王
8年前
<p>今天结合自己在项目开发中的使用，对PopupWindow做一下总结，并对PopupWindow与Dialog做一下对比分析。</p> <p><strong>PopupWindow使用</strong></p> <pre> <code class="language-java"> private void showPopwindow() { // 获取自定义布局文件activity_popupwindow_left.xml的视图 View popupWindow_view = getLayoutInflater().inflate(R.layout.layout_subject, null, false); // 创建PopupWindow实例,200,LayoutParams.MATCH_PARENT分别是宽度和高度 popupWindow = new PopupWindow(popupWindow_view, ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT, true); ColorDrawable dw = new ColorDrawable(0xb0000000); popupWindow.setBackgroundDrawable(dw); popupWindow.setFocusable(true); popupWindow.setOutsideTouchable(false); popupWindow.setAnimationStyle(R.style.PopupAnimation); // 设置动画效果 RecyclerView recylerView = (RecyclerView) popupWindow_view.findViewById(R.id.recylerView); recylerView.setHasFixedSize(true); recylerView.setLayoutManager(new LinearLayoutManager(this, LinearLayoutManager.HORIZONTAL, false)); recylerView.setAdapter(new SubjectAdapter()); // 点击其他地方消失 popupWindow_view.setOnTouchListener(new View.OnTouchListener() { @Override public boolean onTouch(View v, MotionEvent event) { // TODO Auto-generated method stub if (popupWindow != null && popupWindow.isShowing()) { popupWindow.dismiss(); popupWindow = null; } return false; } }); }</code></pre> <p>getLayoutInflater()引入自定义布局；<br> PopupWindow构造方法来设置宽高；<br> setBackgroundDrawable（）设置背景；<br> setFocusable（true）获取焦点；<br> setOutsideTouchable（true）触摸屏幕其他位置消失；<br> setAnimationStyle（int）设置动画<br> PopupWindow背景透明度</p> <pre> <code class="language-java">/** * 设置添加屏幕的背景透明度 * * @param bgAlpha */ public void backgroundAlpha(float bgAlpha) { WindowManager.LayoutParams lp = getWindow().getAttributes(); lp.alpha = bgAlpha; //0.0-1.0 getWindow().setAttributes(lp); }</code></pre> <p><strong>PopupWindow显示位置</strong></p> <p>showAsDropDown(View anchor)：相对某个控件的位置（正左下方），无偏移。<br> showAsDropDown(View anchor, int xoff, int yoff)：相对某个控件的位置，有偏移。<br> showAtLocation(View parent, int gravity, int x, int y)：相对于父控件的位置（例如正中央Gravity.CENTER，下方Gravity.BOTTOM等），可以设置偏移或无偏移。</p> <p><strong>PopupWindow与Dialog的区别</strong></p> <p>1.PopupWindow是阻塞线程的，AlertDialog是非阻塞线程的。就是说AlertDialog在显示时线程还在运行，PopupWindow显示时线程陷入等待，直到dismiss才会继续。</p> <p>2.Dialog没法设置宽为整个屏幕宽，总有点边界。Popupwindow可以(PopupWindow也可以设置有边界)。</p> <p>不管是dialog还是popwindow，在调用ondestroy（）时都要dismiss，否则会报错。</p> <p><strong>自定义AlertDialog小结</strong></p> <pre> <code class="language-java"> myDialog = new AlertDialog.Builder(MainActivity.this).create(); myDialog.show(); Window window = myDialog .getWindow(); window.setWindowAnimations(R.style.dialog_anim); myDialog.getWindow().setContentView(R.layout.mydialog); myDialog.getWindow() .findViewById(R.id.button_back_mydialog) .setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { myDialog.dismiss(); } }); </code></pre> <p>setContentView（）加载自定义布局；<br> setWindowAnimations（）设置动画；</p> <p>设置大小可以通过布局来设置，也可以动态设置</p> <pre> <code class="language-java"> //设置大小 WindowManager.LayoutParams layoutParams = dialog.getWindow().getAttributes(); layoutParams.width = 200; layoutParams.height = LayoutParams.WRAP_CONTENT; </code></pre> <p>显示位置<br> 方式一：</p> <pre> <code class="language-java">window.setGravity(Gravity.TOP); </code></pre> <p>方式二：</p> <pre> <code class="language-java">AlertDialog dlg = new AlertDialog.Builder(this).create(); //------------------------------------------------------------------- Window w=dlg.getWindow(); WindowManager.LayoutParams lp =w.getAttributes(); lp.x=10; lp.y=150;</code></pre> <p>恩，总结到此！</p> <p> </p> <p>来自： <a href="/misc/goto?guid=4959674336993322746" rel="nofollow">http://blog.csdn.net/qq_16131393/article/details/51597326</a></p>