关于popupWindow自上而下动画弹出

Activity中

private Button mBt;

private View mView;

private Button btnSaveProject,btnAbandonProject,btnCancelProject;

private PopupWindow popupWindow;

@Override

protected void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);

    setContentView(R.layout.activity_main);

    initView();

}

private void initView() {

    mBt = (Button) findViewById(R.id.bt);

  mBt.setOnClickListener(new View.OnClickListener() {

      @Override

      public void onClick(View v) {

          LayoutInflater inflater= (LayoutInflater) MainActivity.this.getSystemService(Context.LAYOUT_INFLATER_SERVICE);

          mView = inflater.inflate(R.layout.finish_project_popuwindow, null);

          btnSaveProject = (Button) mView.findViewById(R.id.popupwindow_Button_saveProject);

          btnAbandonProject = (Button) mView.findViewById(R.id.popupwindow_Button_abandonProject);

          btnCancelProject = (Button) mView.findViewById(R.id.popupwindow_cancelButton);

          popupWindow = new PopupWindow(mView, ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);

          // 设置按钮监听

          btnCancelProject.setOnClickListener(new View.OnClickListener() {

              @SuppressLint("LongLogTag")

              @Override

              public void onClick(View v) {

                  Log.i("xue", "取消项目");

                  popupWindow.dismiss();

}

          });

          //设置PopupWindow的View

          popupWindow.setContentView(mView);

          //设置PopupWindow弹出窗体的宽

          popupWindow.setWidth(ViewGroup.LayoutParams.MATCH_PARENT);

          //设置PopupWindow弹出窗体的高

          popupWindow.setHeight(ViewGroup.LayoutParams.WRAP_CONTENT);

          //设置PopupWindow弹出窗体可点击

          popupWindow.setFocusable(true);

          //设置SelectPicPopupWindow弹出窗体动画效果

          popupWindow.setAnimationStyle(R.style.Animation);

          //实例化一个ColorDrawable颜色为半透明

          ColorDrawable dw= new ColorDrawable(0xb0000000);

          //设置SelectPicPopupWindow弹出窗体的背景

          popupWindow.setBackgroundDrawable(dw);

          popupWindow.showAtLocation(MainActivity.this.findViewById(R.id.main), Gravity.BOTTOM|Gravity.CENTER_HORIZONTAL, 0, 0);

}

  });

}

新建anim文件夹

enter_anim.xml中

    android:shareInterpolator="false"

    >

   

        android:fromYDelta="100%p"

        android:toYDelta="0"

        android:duration="100" />

   

        android:fromAlpha="0"

        android:toAlpha="1.0"

        android:duration="100"/>

out_anim.xml中

    android:shareInterpolator="false"

    >

   

        android:fromYDelta="0"

        android:toYDelta="100%p"

        android:duration="100"/>

   

        android:fromAlpha="1.0"

        android:toAlpha="0"

        android:duration="100"/>

style中