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。

/**

*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);

b9a9
}

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