初识PopupWindow

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PopupWindow和Dialog的区别

Android中对话框有两种:Dialog和Popupwindow
AlertDialog是非阻塞线程的，Popupwindow是阻塞线程的
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)
Dialog不能通过先加载view再查找按钮的方式来设置点击事件，必须通过Dialog对象去查找

Dialog dg=new Dialog(MainActivity.this);  dg.setContentView(R.layout.tt);  dg.show();  Button bb=(Button) dg.findViewById(R.id.bb);  bb.setOnClickListener(new OnClickListener() {      @Override      public void onClick(View v) {          Toast.makeText(MainActivity.this, "btn2", 1).show();      }  });

自定义的PopupWindow创建时候一些必须的方法：

package com.wwj.popupwindow;  import android.app.Activity;  import android.content.Context;  import android.graphics.drawable.ColorDrawable;  import android.view.LayoutInflater;  import android.view.View;  import android.view.View.OnClickListener;  import android.view.ViewGroup.LayoutParams;  import android.widget.LinearLayout;  import android.widget.PopupWindow;  /**  * 自定义popupWindow  *   * @author wwj  *   *   */  public class AddPopWindow extends PopupWindow {      private View conentView;      public AddPopWindow(final Activity context) {          LayoutInflater inflater = (LayoutInflater) context                  .getSystemService(Context.LAYOUT_INFLATER_SERVICE);          conentView = inflater.inflate(R.layout.add_popup_dialog, null);          int h = context.getWindowManager().getDefaultDisplay().getHeight();          int w = context.getWindowManager().getDefaultDisplay().getWidth();          // 设置SelectPicPopupWindow的View          this.setContentView(conentView);          // 设置SelectPicPopupWindow弹出窗体的宽          this.setWidth(w / 2 + 50);          // 设置SelectPicPopupWindow弹出窗体的高          this.setHeight(LayoutParams.WRAP_CONTENT);          // 设置SelectPicPopupWindow弹出窗体可点击          this.setFocusable(true);          this.setOutsideTouchable(true);          // 刷新状态          this.update();          // 实例化一个ColorDrawable颜色为半透明          ColorDrawable dw = new ColorDrawable(0000000000);          // 点back键和其他地方使其消失,设置了这个才能触发OnDismisslistener ，设置其他控件变化等操作          this.setBackgroundDrawable(dw);          // mPopupWindow.setAnimationStyle(android.R.style.Animation_Dialog);          // 设置SelectPicPopupWindow弹出窗体动画效果          this.setAnimationStyle(R.style.AnimationPreview);          LinearLayout addTaskLayout = (LinearLayout) conentView                  .findViewById(R.id.add_task_layout);          LinearLayout teamMemberLayout = (LinearLayout) conentView                  .findViewById(R.id.team_member_layout);          addTaskLayout.setOnClickListener(new OnClickListener() {              @Override              public void onClick(View arg0) {                  AddPopWindow.this.dismiss();              }          });          teamMemberLayout.setOnClickListener(new OnClickListener() {              @Override              public void onClick(View v) {                  AddPopWindow.this.dismiss();              }          });      }      /**      * 显示popupWindow      *       * @param parent      */      public void showPopupWindow(View parent) {          if (!this.isShowing()) {              // 以下拉方式显示popupwindow              this.showAsDropDown(parent, parent.getLayoutParams().width / 2, 18);          } else {              this.dismiss();          }      }  }

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