弹出一个 PopupWindows

new PopupWindows(mContext, noScrollgridview);

public class PopupWindows extends PopupWindow {

    public PopupWindows(Context mContext, View parent) {

        View view = View
                .inflate(mContext, R.layout.item_popupwindows, null);
        view.startAnimation(AnimationUtils.loadAnimation(mContext,
                R.anim.fade_ins));
        LinearLayout ll_popup = (LinearLayout) view
                .findViewById(R.id.ll_popup);
        ll_popup.startAnimation(AnimationUtils.loadAnimation(mContext,
                R.anim.push_bottom_in_2));

        setWidth(ViewGroup.LayoutParams.FILL_PARENT);
        setHeight(ViewGroup.LayoutParams.FILL_PARENT);
        setBackgroundDrawable(new BitmapDrawable());
        setFocusable(true);
        setOutsideTouchable(true);
        setContentView(view);
        showAtLocation(parent, Gravity.BOTTOM, 0, 0);
        update();

        Button bt1 = (Button) view
                .findViewById(R.id.item_popupwindows_camera);
        Button bt2 = (Button) view
                .findViewById(R.id.item_popupwindows_Photo);
        Button bt3 = (Button) view
                .findViewById(R.id.item_popupwindows_cancel);
        bt1.setText("删除");
        bt1.setTextColor(Color.RED);
        bt2.setText("取消");
        bt1.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {

// photo();
dismiss();
}
});
bt2.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
// Intent intent = new Intent(EditCourseActivity.this,ChosePhotoActivity.class);
// startActivity(intent);
dismiss();
}
});
bt3.setVisibility(View.GONE);
}
}

动画
<?xml version="1.0" encoding="utf-8"?>
<alpha xmlns:android="http://schemas.android.com/apk/res/android"
android:duration="20"
android:fromAlpha="0.0"
android:toAlpha="1.0" />

动画
<?xml version="1.0" encoding="utf-8"?>
<translate xmlns:android="http://schemas.android.com/apk/res/android"
android:duration="20"
android:fromYDelta="100%"
android:interpolator="@android:anim/decelerate_interpolator"
android:toYDelta="0" />

布局文件
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@drawable/bg_transparent" >

<LinearLayout
    android:id="@+id/ll_popup"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_alignParentBottom="true"
    android:background="#ffffff"
    android:orientation="vertical" >

    <TextView
        android:layout_width="match_parent"
        android:layout_height="1dp"
        android:background="#ff495a" />

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="55dp"
        android:orientation="horizontal" >

        <Button
            android:id="@+id/item_popupwindows_camera"
            android:layout_width="match_parent"
            android:layout_height="55dp"
            android:background="@drawable/bt_nobgd"
            android:textColor="#585858"
            android:textSize="18sp"
            android:text="拍照" />
    </LinearLayout>

    <TextView
        android:layout_marginLeft="80dp"
        android:layout_width="match_parent"
        android:layout_height="1px"
        android:background="#f2f2f2" />

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="55dp"
        android:orientation="horizontal" >

        <Button
            android:id="@+id/item_popupwindows_Photo"
            android:layout_width="match_parent"
            android:layout_height="55dp"
            android:background="@drawable/bt_nobgd"
            android:textColor="#585858"
            android:textSize="18sp"
            android:text="从相册中选取" />
    </LinearLayout>

    <TextView
        android:layout_width="match_parent"
        android:layout_height="2dp"
        android:background="#f3f3f3" />

    <Button
        android:id="@+id/item_popupwindows_cancel"
        android:layout_width="match_parent"
        android:layout_height="55dp"
        android:background="@drawable/bt_nobgd"
        android:textColor="#585858"
        android:textSize="18sp"
        android:text="取消" />
</LinearLayout>

</RelativeLayout>