GestureOverlayView自定义手势 坐标有负数

Question

布局文件：
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"

<android.gesture.GestureOverlayView
    android:id="@+id/gesture"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" 
    >

</android.gesture.GestureOverlayView>

android:layout_width="350dip"
android:layout_height="wrap_content"
android:layout_gravity="right|bottom"
android:layout_marginBottom="40dip"
android:orientation="horizontal" >

    <Button
        android:id="@+id/btn_play"
        android:layout_width="50dip"
        android:layout_height="30dip"
        android:text="@string/activity_drawgesture_btn1" 
        android:background="#999999"
        android:layout_marginLeft="8dip"
        android:textColor="#ffffff"
        style="?android:attr/borderlessButtonStyle"
        />

    <Button
        android:id="@+id/btn_raclage"
        android:layout_width="50dip"
        android:layout_height="30dip"
        android:text="@string/activity_drawgesture_btn2" 
        android:background="#999999"
        android:layout_marginLeft="8dip"
        android:textColor="#ffffff"
        style="?android:attr/borderlessButtonStyle"
        />

    <Button
        android:id="@+id/btn_ok"
        android:layout_width="50dip"
        android:layout_height="30dip"
        android:text="@string/activity_drawgesture_btn3"
        android:background="#999999"
        android:layout_marginLeft="8dip"
        android:textColor="#ffffff"
        style="?android:attr/borderlessButtonStyle"
         />

    <Button
        android:id="@+id/btn_back"
        android:layout_width="50dip"
        android:layout_height="30dip"
        android:text="@string/activity_drawgesture_btn4"
        android:background="#999999"
        android:layout_marginLeft="8dip"
        android:textColor="#ffffff"
        style="?android:attr/borderlessButtonStyle"
         />

Answer 1

别沉，别沉，大神快看看！！！