Android实现底部弹窗效果

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:gravity="center" android:id="@+id/ll_image"> <Button android:id="@+id/bt_select_image" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="选择图片" /></LinearLayout>

public class MainActivity extends AppCompatActivity implements View.OnClickListener { private SelectPicPopupWindow menuWindow; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); findViewById(R.id.bt_select_image).setOnClickListener(this); } @Override public void onClick(View view) { switch (view.getId()) {  case R.id.bt_select_image:  //TODO implement  selectImgs(); } } private void selectImgs(){ menuWindow = new SelectPicPopupWindow(MainActivity.this, itemsOnClick); //设置弹窗位置 menuWindow.showAtLocation(MainActivity.this.findViewById(R.id.ll_image), Gravity.BOTTOM | Gravity.CENTER_HORIZONTAL, 0, 0); } private View.OnClickListener itemsOnClick = new View.OnClickListener() { public void onClick(View v) {  menuWindow.dismiss();  switch (v.getId()) {  case R.id.item_popupwindows_camera: //点击拍照按钮   break;  case R.id.item_popupwindows_Photo: //点击从相册中选择按钮   break;  default:   break;  } } };}

 **public class SelectPicPopupWindow extends PopupWindow {  private Button item_popupwindows_camera, //弹窗拍照按钮   item_popupwindows_Photo,  //弹窗从相册选择按钮   item_popupwindows_cancel;  //弹窗取消按钮  private View menuview;  /**  * 上传图片*************************  * @param context  * @param itemsOnclick  */  public SelectPicPopupWindow(Activity context, View.OnClickListener itemsOnclick){  super(context);  LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);  menuview = inflater.inflate(R.layout.item_popupwindows,null);  item_popupwindows_camera = (Button) menuview.findViewById(R.id.item_popupwindows_camera); //拍照按钮  item_popupwindows_cancel = (Button) menuview.findViewById(R.id.item_popupwindows_cancel); //取消按钮  item_**popupwindows_Photo = (Button) menuview.findViewById(R.id.item_popupwindows_Photo); //图库按钮  /**   * 取消按钮销毁事件   */  item_popupwindows_cancel.setOnClickListener(new View.OnClickListener() {   public void onClick(View view) {   dismiss();   }  });  item_popupwindows_camera.setOnClickListener(itemsOnclick);  item_popupwindows_Photo.setOnClickListener(itemsOnclick);  //设置SelectPicPopupWindow的View  this.setContentView(menuview);  //设置SelectPicPopupWindow**弹出窗体的宽  this.setWidth(ViewGroup.LayoutParams.FILL_PARENT);  //设置SelectPicPopupWindow弹出窗体的高  //修改高度显示，解决被手机底部虚拟键挡住的问题 by黄海杰 at:2015-4-30  this.setHeight(ViewGroup.LayoutParams.MATCH_PARENT);  //设置SelectPicPopupWindow弹出窗体可点击  this.setFocusable(true);  //设置SelectPicPopupWindow弹出窗体动画效果  //this.setAnimationStyle(R.style);  //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  this.setBackgroundDrawable(dw);  //menuview添加ontouchlistener监听判断获取触屏位置如果在选择框外面则销毁弹出框  menuview.setOnTouchListener(new View.OnTouchListener() {   public boolean onTouch(View view, MotionEvent motionEvent) {   int height = menuview.findViewById(R.id.ll_popup).getTop();   int y = (int) motionEvent.getY();   if (motionEvent.getAction() == MotionEvent.ACTION_UP){    if (y<height){    dismiss();    }   }   return true;   }  });  } }**