自定义PopupWindow轻松实现从底部弹出

1、首先，肯定要有动画资源吧，要不怎么弹嘞。啥都不管，先定义两个动画肯定用的着。

<?xml version="1.0" encoding="utf-8"?>
<!-- res/anim文件夹下定义  -->
<!-- 名为push_bottom_in.xml -->
<set xmlns:android="http://schemas.android.com/apk/res/android" >

    <translate
        android:duration="500"
        android:fromYDelta="100%p"
        android:toYDelta="0" />

</set>

---

<?xml version="1.0" encoding="utf-8"?>
<!-- push_buttom_out.xml-->
<set xmlns:android="http://schemas.android.com/apk/res/android" >

    <translate
        android:duration="500"
        android:fromYDelta="0"
        android:toYDelta="50%p" />
</set>

2、将上面两个动画加载到我们的PopupWindow上吧，可以在styles文件下定义

<style name="mypopwindow_anim_style">
        <item name="android:windowEnterAnimation">@anim/push_bottom_in</item>
        <!-- 指定显示的动画xml -->

        <item name="android:windowExitAnimation">@anim/push_buttom_out</item>
        <!-- 指定消失的动画xml -->
</style>

3、PopupWindow的布局

<?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="wrap_content" 
    android:gravity="center_horizontal">

    <LinearLayout 
        android:id="@+id/id_pop_layout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        android:layout_alignParentBottom="true">

        <Button 
            android:id="@+id/id_btn_take_photo"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="10dp"
            android:layout_marginLeft="10dp"
            android:layout_marginRight="10dp"
            android:text="拍照"/>

        <Button 
            android:id="@+id/id_btn_select"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="5dp"
            android:layout_marginLeft="10dp"
            android:layout_marginRight="10dp"
            android:text="从相册中选择"/>

        <Button 
            android:id="@+id/id_btn_cancelo"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_margin="10dp"
            android:text="取消"/>

    </LinearLayout>

</RelativeLayout>

4、自定义所需的PopupWindow

public class CustomPopupWindow extends PopupWindow implements OnClickListener {

    private Button btnTakePhoto, btnSelect, btnCancel;
    private View mPopView;
    private OnItemClickListener mListener;

    public CustomPopupWindow(Context context) {
        super(context);
        // TODO Auto-generated constructor stub
        init(context);
        setPopupWindow();
        btnTakePhoto.setOnClickListener(this);
        btnSelect.setOnClickListener(this);
        btnCancel.setOnClickListener(this);

}

    /**
     * 初始化
     * 
     * @param context
     */
    private void init(Context context) {
        // TODO Auto-generated method stub
        LayoutInflater inflater = LayoutInflater.from(context);
        //绑定布局
        mPopView = inflater.inflate(R.layout.custom_popup_window, null);

        btnTakePhoto = (Button) mPopView.findViewById(R.id.id_btn_take_photo);
        btnSelect = (Button) mPopView.findViewById(R.id.id_btn_select);
        btnCancel = (Button) mPopView.findViewById(R.id.id_btn_cancelo);
    }

    /**
     * 设置窗口的相关属性
     */
    @SuppressLint("InlinedApi")
    private void setPopupWindow() {
        this.setContentView(mPopView);// 设置View
        this.setWidth(LayoutParams.MATCH_PARENT);// 设置弹出窗口的宽
        this.setHeight(LayoutParams.WRAP_CONTENT);// 设置弹出窗口的高
        this.setFocusable(true);// 设置弹出窗口可
        this.setAnimationStyle(R.style.mypopwindow_anim_style);// 设置动画
       this.setBackgroundDrawable(new ColorDrawable(0x00000000));// 设置背景透明
        mPopView.setOnTouchListener(new OnTouchListener() {// 如果触摸位置在窗口外面则销毁

            @Override
            public boolean onTouch(View v, MotionEvent event) {
                // TODO Auto-generated method stub
                int height = mPopView.findViewById(R.id.id_pop_layout).getTop();
                int y = (int) event.getY();
                if (event.getAction() == MotionEvent.ACTION_UP) {
                    if (y < height) {
                        dismiss();
                    }
                }
                return true;
            }
        });
    }

    /**
     * 定义一个接口，公布出去 在Activity中操作按钮的单击事件
     */
    public interface OnItemClickListener {
        void setOnItemClick(View v);
    }

    public void setOnItemClickListener(OnItemClickListener listener) {
        this.mListener = listener;
    }

    @Override
    public void onClick(View v) {
        // TODO Auto-generated method stub
        if (mListener != null) {
            mListener.setOnItemClick(v);
        }
    }

}

5、activity

public class MainActivity extends Activity implements OnItemClickListener{

    private CustomPopupWindow mPop;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mPop=new CustomPopupWindow(this);
        mPop.setOnItemClickListener(this);
        findViewById(R.id.id_start).setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                //设置PopupWindow中的位置
                mPop.showAtLocation(MainActivity.this.findViewById(R.id.main), Gravity.BOTTOM|Gravity.CENTER_HORIZONTAL, 0, 0);
            }
        });
    }
    @Override
    public void setOnItemClick(View v) {
        // TODO Auto-generated method stub
        switch(v.getId()){
        case R.id.id_btn_take_photo:
            Toast.makeText(getApplicationContext(), "拍照", Toast.LENGTH_LONG).show();
            break;
        case R.id.id_btn_select:
            Toast.makeText(getApplicationContext(),"从相册中选择", Toast.LENGTH_LONG).show();
            break;
        case R.id.id_btn_cancelo:
            mPop.dismiss();
            break;
        }
   }
}

6、效果图