其实原理就是WindowManager Dialog 和Animation的组合

这里分享一个Android的非常经典实用而且简单方便的第三方UI控件库：BottomView（小米的米UI也用到了这个）

实现功能：

可以在底部弹出的View里自定义布局；

可以自定义是否可以触摸外部消失；

可以自定义事件；

可以自定义外围背景是否透明；

可以自定义动画；

如果需要的话，可以强制为顶部View显示

用法：

1、下载BottomView.jar库文件，放到Android项目工程里的libs里

2、设置BottomView的Theme：

这2个Theme复制粘贴到你的项目的res/values/styles.xml里即可

另外如果提示

这里的white找不到的话，说明你项目res/values/color.xml没有新建或者没有white颜色这个值，只需在res/values/color.xml里添加

这个白色值即可。

另外View的动画Theme可选，建议也复制进去，效果好一些，代码如下：

res/anim/bottomview_anim_enter.xml

res/anim/bottomview_anim_exit.xml

整体为：

2、部分核心使用代码：

如果想获取这个View的话，调用.getView()方法即可。

效果图之一：（可随意发挥）

以下是源代码“：

package com.tandong.bottomview;

import java.util.ArrayList;

import android.app.Activity;

import android.os.Bundle;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.AdapterView;

import android.widget.AdapterView.OnItemClickListener;

import android.widget.Button;

import android.widget.ListView;

import com.tandong.bottomview.adapter.BVAdapter;

import com.tandong.bottomview.view.BottomView;

/**

 * BottomView

 *

 * www.aplesson.com

 *

 * @author TanDong

 *

 */

public class MainActivity extends Activity implements OnClickListener {

  private Button btn_show;

  private ListView lv_menu_list;

  private ArrayList<String> menus;

  private BottomView bottomView;

  @Override

  protected void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);

    setContentView(R.layout.activity_main);

    initView();

    initData();

  }

  private void initData() {

    menus = new ArrayList<String>();

    menus.add(getResources().getString(R.string.menu_search));

    menus.add(getResources().getString(R.string.menu_filemanage));

    menus.add(getResources().getString(R.string.menu_downloadmanage));

    menus.add(getResources().getString(R.string.menu_setting));

    menus.add(getResources().getString(R.string.menu_about));

  }

  private void initView() {

    btn_show = (Button) this.findViewById(R.id.btn_show);

    btn_show.setOnClickListener(this);

  }

  @Override

  public void onClick(View arg0) {

    switch (arg0.getId()) {

    case R.id.btn_show:

      bottomView = new BottomView(MainActivity.this,

          R.style.BottomViewTheme_Defalut, R.layout.bottom_view);

      bottomView.setAnimation(R.style.BottomToTopAnim);

      bottomView.showBottomView(false);

      lv_menu_list = (ListView) bottomView.getView().findViewById(

          R.id.lv_list);

      BVAdapter adapter = new BVAdapter(MainActivity.this, menus);

      lv_menu_list.setAdapter(adapter);

      lv_menu_list.setOnItemClickListener(new OnItemClickListener() {

        @Override

        public void onItemClick(AdapterView<?> arg0, View arg1,

            int arg2, long arg3) {

          bottomView.dismissBottomView();

        }

      });

      break;

    default:

      break;

    }

  }

}

package com.tandong.bottomview.adapter;

import java.util.ArrayList;

import android.content.Context;

import android.view.View;

import android.view.ViewGroup;

import android.widget.BaseAdapter;

import android.widget.TextView;

import com.tandong.bottomview.R;

/**

 * BottomView

 *

 * @author TanDong

 *

 */

public class BVAdapter extends BaseAdapter {

  private Context c;

  private ArrayList<String> alss;

  public BVAdapter(Context context, ArrayList<String> als) {

    this.c = context;

    this.alss = als;

  }

  @Override

  public int getCount() {

    // TODO Auto-generated method stub

    return alss.size();

  }

  @Override

  public Object getItem(int arg0) {

    // TODO Auto-generated method stub

    return alss.get(arg0);

  }

  @Override

  public long getItemId(int arg0) {

    // TODO Auto-generated method stub

    return arg0;

  }

  @Override

  public View getView(int position, View convertView, ViewGroup arg2) {

    convertView = View.inflate(c, R.layout.item, null);

    TextView tv = (TextView) convertView.findViewById(R.id.tv_name);

    tv.setText(alss.get(position));

    return convertView;

  }

}

原理：

package com.tandong.bottomview.view;

import android.app.Dialog;

import android.content.Context;

import android.view.Display;

import android.view.View;

import android.view.Window;

import android.view.WindowManager;

import android.view.WindowManager.LayoutParams;

public class BottomView

{

  private View convertView;

  private Context context;

  private int theme;

  private Dialog bv;

  private int animationStyle;

  private boolean isTop = false;

  public BottomView(Context c, int theme, View convertView)

  {

    this.theme = theme;

    this.context = c;

    this.convertView = convertView;

  }

  public BottomView(Context c, int theme, int resource) {

    this.theme = theme;

    this.context = c;

    this.convertView = View.inflate(c, resource, null);

  }

  public void showBottomView(boolean CanceledOnTouchOutside) {

    if (this.theme == 0)

      this.bv = new Dialog(this.context);

    else

      this.bv = new Dialog(this.context, this.theme);

    this.bv.setCanceledOnTouchOutside(CanceledOnTouchOutside);

    this.bv.getWindow().requestFeature(1);

    this.bv.setContentView(this.convertView);

    Window wm = this.bv.getWindow();

    WindowManager m = wm.getWindowManager();

    Display d = m.getDefaultDisplay();

    WindowManager.LayoutParams p = wm.getAttributes();

    p.width = (d.getWidth() * 1);

    if (this.isTop)

      p.gravity = 48;

    else

      p.gravity = 80;

    if (this.animationStyle != 0)

    {

      wm.setWindowAnimations(this.animationStyle);

    }

    wm.setAttributes(p);

    this.bv.show();

  }

  public void setTopIfNecessary() {

    this.isTop = true;

  }

  public void setAnimation(int animationStyle) {

    this.animationStyle = animationStyle;

  }

  public View getView() {

    return this.convertView;

  }

  public void dismissBottomView() {

    if (this.bv != null)

      this.bv.dismiss();

  }

}