android的Popupwindow根据手势来贴边划出

刚刚开始学习android，没事的时候想实现一下Popupwindow依靠手势来贴边弹出，在网上东抄西抄终于完成了，代码贴上。

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/**

*获取屏幕大小的类

**/

package modle.di.tang.android.Guest;

import android.content.Context;
import android.util.DisplayMetrics;
import android.view.WindowManager;

/**
 * Created by tangdi on 2016/1/11.
 */
public class GestureUtils {

    //获取屏幕的大小
    public static GuestModelActivity.Screen getScreenPix(Context context) {
        DisplayMetrics dm = new DisplayMetrics();
        WindowManager windowManager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
        windowManager.getDefaultDisplay().getMetrics(dm);
        return new GuestModelActivity.Screen(dm.widthPixels,dm.heightPixels);
    }
}

/**

*通过手势来弹出Popuwindow

其实就是继承了android 的GestureDetector。OnGestureListener这个借口

但是要注意，在重写OnTouchEvent（Event e）这个方法的时候，一定要return
GestureDetector .OnTouchEvent()方法，意思就是将OnTouchEvent方法触摸事件托管给了手势来处理，
1>继承
GestureDetector.OnGestureListener
2>创建
GestureDetector 实体类
3>注册
GestureDetector 实体类
4>
将OnTouchEvent事件交给手势来处理
5>实现
GestureDetector.OnGestureListener
手势托管就完成了，接下来我就定义了几个自己的动画。代码在下面

**/

import android.app.ActionBar;
import android.app.Activity;
import android.content.Context;

import android.location.Location;
import android.os.Bundle;
import android.text.Layout;
import android.util.Log;
import android.view.GestureDetector;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.WindowManager;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.PopupWindow;


import modle.di.tang.androidmodle.R;

/**
 * Created by tangdi on 2016/1/12.
 */
public class GuestModelActivity extends Activity implements GestureDetector.OnGestureListener{

    private GestureDetector mGestureDetector;

    /**
     * 获得屏幕尺寸
     */
    private Screen screen;

    private PopupWindow popupWindow;

    private View contentView;


    private int from = 0;

    private static final String TAG = "GuestModelActivity";

   @Override
   protected void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.activity_guest);
       mGestureDetector = new GestureDetector(this, this);
       screen = GestureUtils.getScreenPix(this);
       popupWindowInit();
   }

    private void popupWindowInit(){
        contentView = LayoutInflater.from(this).inflate(R.layout.activity_popup, null);
        popupWindow = new PopupWindow(contentView);
        popupWindow.setBackgroundDrawable(getResources().
                getDrawable(R.color.self_color));
        popupWindow.setOutsideTouchable(true);
        popupWindow.setFocusable(true);

    }


    @Override
    public boolean onTouchEvent(MotionEvent event){

        return mGestureDetector.onTouchEvent(event);
    }

    @Override
    public boolean onDown(MotionEvent e){
        /**
         * 按下手势
         */
        return false;
    }

    @Override
    public void onShowPress(MotionEvent e){

    }

    @Override
    public boolean onSingleTapUp(MotionEvent e){
        return false;
    }

    @Override
    public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY){
        /**
         * 拖动手势
         */
        return false;
    }

    @Override
    public void onLongPress(MotionEvent e){
        /**
         * 长按手势
         */
    }

    @Override
    public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY){
        //手指划过屏幕的横向距离

        float x = e2.getX() - e1.getX();
        //手指划过屏幕的纵向距离
        float y = e2.getY() - e1.getY();

        //取得横向距离的绝对值
        float x_abs = Math.abs(x);
        //取得纵向距离的绝对值
        float y_abs = Math.abs(y);

        //屏幕1/5的距离
        float x_limit = screen.widthPixels / 5;
        float y_limit = screen.heightPixels / 5;

        //手指在屏幕上横向滑动
        if(x_abs >= y_abs){
            if(x > x_limit || x < -x_limit){
                if(x > 0){
                    //向右移动
                    from = location.RIGHT.ordinal();
                    initPopuWindow();
                    Log.e(TAG, "Right");
                }else if(x < 0){
                    //向左移动
                    from = location.LEFT.ordinal();
                    initPopuWindow();
                    Log.e(TAG, "Left");
                }
            }
        }
        //横向滑动
        else {
            if(y > y_limit || y < -y_limit){
                if(y > 0){
                    //向下
                    from = location.TOP.ordinal();
                    initPopuWindow();
                    Log.e(TAG, "Down");

                }else if(y < 0 ){
                    //向上
                    from = location.BOTTOM.ordinal();
                    initPopuWindow();
                    Log.e(TAG, "Up");

                }
            }
        }
        return false;
    }


    /**
     * 屏幕尺寸类
     */
    public static class Screen{

        public int widthPixels;
        public int heightPixels;

        public Screen(){}

        public Screen(int widthPixels,int heightPixels){
            this.widthPixels=widthPixels;
            this.heightPixels=heightPixels;
        }

        @Override
        public String toString() {
            return "("+widthPixels+","+heightPixels+")";
        }

    }

    class popupDosmissListener implements PopupWindow.OnDismissListener{
        @Override
        public void onDismiss(){
            //backgroundAlpha(1f);
        }
    }

    private void backgroundAlpha(float bgAlpha){
        WindowManager.LayoutParams lp = getWindow().getAttributes();
        lp.alpha = bgAlpha;
        getWindow().setAttributes(lp);
    }

    private void initPopuWindow(){
        if(location.LEFT.ordinal() == from || location.RIGHT.ordinal() == from){
            //是否可以不这样定义宽度
            popupWindow.setWidth(800);
            popupWindow.setHeight(LinearLayout.LayoutParams.MATCH_PARENT);
        }else if(location.BOTTOM.ordinal() == from || location.TOP.ordinal() == from){
            popupWindow.setWidth(LinearLayout.LayoutParams.MATCH_PARENT);
            popupWindow.setHeight(1200);
        }
        if(location.LEFT.ordinal() == from){
            popupWindow.setAnimationStyle(R.style.AnimationRightFade);
        }
        if(location.RIGHT.ordinal() == from){
            popupWindow.setAnimationStyle(R.style.AnimationLeftFade);
        }
        if(location.BOTTOM.ordinal() == from){
            popupWindow.setAnimationStyle(R.style.AnimationBottomFade);
        }
        if(location.TOP.ordinal() == from){
            popupWindow.setAnimationStyle(R.style.AnimationTopFade);
        }

        if(location.LEFT.ordinal() == from){
            popupWindow.showAtLocation(GuestModelActivity.this.findViewById(R.id.layout_main),
                    Gravity.RIGHT, 0, 0);

            Log.e(TAG, "显示向左的Popuwindow");
        }else if(location.RIGHT.ordinal() == from){
            popupWindow.showAtLocation(GuestModelActivity.this.findViewById(R.id.layout_main),
                    Gravity.LEFT, 0, 0);

            Log.e(TAG, "显示向右的Popuwindow");
        }else if(location.BOTTOM.ordinal() == from){
            popupWindow.showAtLocation(GuestModelActivity.this.findViewById(R.id.layout_main),
                    Gravity.BOTTOM|Gravity.CENTER_HORIZONTAL, 0, 0);

            Log.e(TAG, "显示向下的Popuwindow");
        }else if(location.TOP.ordinal() == from){
            popupWindow.showAtLocation(GuestModelActivity.this.findViewById(R.id.layout_main),
                    Gravity.TOP|Gravity.CENTER_HORIZONTAL, 0, 0);
        }
       //backgroundAlpha(0.5f);
        //popupWindow.setOnDismissListener(new popupDosmissListener());
    }

    private enum location{
        LEFT,
        RIGHT,
        TOP,
        BOTTOM
    }

}


                         

in_bottomtotop.xml

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
    <translate android:fromYDelta="100%"
        android:toYDelta="0"
        android:duration="300"/>
</set>
in_lefttoright.xml
<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
    <translate
        android:fromXDelta="-100%"
        android:toXDelta="0"
        android:duration="300"/>
</set>

in_righttoleft.xml
<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
    <translate android:fromXDelta="100%"
        android:toXDelta="0"
        android:duration="300"/>
</set>

in_toptobottom.xml
<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
    <translate android:fromYDelta="-100%"
        android:toYDelta="0"
        android:duration="300">
    </translate>

</set>

out_bottomtotop.xml
<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
    <translate android:fromYDelta="0"
        android:toYDelta="-100%"
        android:duration="500"/>
</set>

out_lefttoright.xml
<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
    <translate android:fromXDelta="0"
        android:toXDelta="100%"
        android:duration="300">
    </translate>
</set>

out_righttoleft.xml
<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
    <translate android:fromXDelta="0"
        android:toXDelta="-100%"
        android:duration="300">
    </translate>

</set>

out_toptobottom.xml
<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
    <translate android:fromYDelta="0"
        android:toYDelta="100%"
        android:duration="300"/>
</set>



activity_guest.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:id="@+id/layout_main"
    android:background="@drawable/bg_snow_night">

</LinearLayout>
对于translate动画的了解，



是根据android手机屏幕的直角坐标系来完成的

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