优化手势识别类TouchGestureDetector,ScaleGestureDetector使用Api27源码

AndroidsDemo/res/layout/activity_touchgesturedetector.xml

@@ -16,6 +16,7 @@
     <com.example.androidsdemo.view.EasyPaintView
         android:id="@+id/easy_paint_view"
         android:layout_width="match_parent"
+        android:background="#88888888"
         android:layout_height="match_parent"/>
 
     <TextView

AndroidsDemo/src/com/example/androidsdemo/TouchGestureDetectorDemo.java

@@ -5,12 +5,12 @@
 import android.support.annotation.Nullable;
 import android.util.Log;
 import android.view.MotionEvent;
-import android.view.ScaleGestureDetector;
 import android.view.View;
 import android.widget.Toast;
 
 import com.example.androidsdemo.view.EasyPaintView;
 
+import cn.forward.androids.ScaleGestureDetectorApi27;
 import cn.forward.androids.TouchGestureDetector;
 
 /**
@@ -85,20 +85,25 @@ public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float d
 
 
             @Override
-            public boolean onScaleBegin(ScaleGestureDetector detector) {
+            public boolean onScaleBegin(ScaleGestureDetectorApi27 detector) {
                 Log.d(TAG, "onScaleBegin: ");
                 mLastFocusX = null;
                 mLastFocusY = null;
                 return true;
             }
 
             @Override
-            public void onScaleEnd(ScaleGestureDetector detector) {
+            public void onScaleEnd(ScaleGestureDetectorApi27 detector) {
                 Log.d(TAG, "onScaleEnd: ");
+                float scale = 1f;
+                mTargetView.setScaleX(scale);
+                mTargetView.setScaleY(scale);
+                mTargetView.setTranslationX(0);
+                mTargetView.setTranslationY(0);
             }
 
             @Override
-            public boolean onScale(ScaleGestureDetector detector) {
+            public boolean onScale(ScaleGestureDetectorApi27 detector) {
                 Log.d(TAG, "onScale: ");
                 // 屏幕上的焦点
                 mTouchCentreX = detector.getFocusX();
@@ -109,8 +114,8 @@ public boolean onScale(ScaleGestureDetector detector) {
                     final float dy = mTouchCentreY - mLastFocusY;
                     // 移动图片
 
-                    mTargetView.setTranslationX(mTargetView.getTranslationX() + dx);
-                    mTargetView.setTranslationY(mTargetView.getTranslationY() + dy);
+//                    mTargetView.setTranslationX(mTargetView.getTranslationX() + dx);
+//                    mTargetView.setTranslationY(mTargetView.getTranslationY() + dy);
                 }
 
                 // 缩放图片
@@ -134,13 +139,14 @@ public boolean onScale(ScaleGestureDetector detector) {
 
         mTouchGestureDetector.setIsScrollAfterScaled(false);
 
-        findViewById(R.id.container).setOnTouchListener(new View.OnTouchListener() {
+        mEasyPaintView.setOnTouchListener(new View.OnTouchListener() {
             @Override
             public boolean onTouch(View v, MotionEvent event) {
                 return mTouchGestureDetector.onTouchEvent(event);
             }
         });
-
+        mEasyPaintView.setScaleX(0.5f);
+        mEasyPaintView.setScaleY(0.5f);
     }
 
 }

androids/build.gradle

@@ -7,8 +7,8 @@ android {
     defaultConfig {
         minSdkVersion 14
         targetSdkVersion 19
-        versionCode 15
-        versionName "1.2.1"
+        versionCode 16
+        versionName "1.2.2"
     }
     buildTypes {
         release {

androids/res/values-sw600dp/dimens.xml

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <!-- Use a larger scaling span for larger screen devices. -->
+    <dimen name="androids_api27_config_minScalingSpan">32mm</dimen>
+</resources>

androids/res/values/dimens.xml

@@ -0,0 +1,14 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <!-- Minimum span needed to begin a touch scaling gesture.
+     If the span is equal to or greater than this size, a scaling gesture
+     will begin, where supported. (See android.view.ScaleGestureDetectorApi27)
+
+     This also takes into account the size of any active touch points.
+     Devices with screens that deviate too far from their assigned density
+     bucket should consider tuning this value in a device-specific overlay.
+     For best results, care should be taken such that this value remains
+     larger than the minimum reported touchMajor/touchMinor values
+     reported by the hardware. -->
+    <dimen name="androids_api27_config_minScalingSpan">27mm</dimen>
+</resources>