hyzp_ybqx-Commit154：使用自定义 my_flutter_drag_scale 插件，完美解决Listview滚动与图片缩放拖动之间的手势冲突，不会消耗点击事件，滚动很灵敏

lib/my_flutter_drag_scale/android/build.gradle

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+group 'com.example.flutter_drag_scale'
+version '1.0-SNAPSHOT'
+
+buildscript {
+    repositories {
+        google()
+        jcenter()
+    }
+
+    dependencies {
+        classpath 'com.android.tools.build:gradle:3.2.1'
+    }
+}
+
+rootProject.allprojects {
+    repositories {
+        google()
+        jcenter()
+    }
+}
+
+apply plugin: 'com.android.library'
+
+android {
+    compileSdkVersion 28
+
+    defaultConfig {
+        minSdkVersion 16
+        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
+    }
+    lintOptions {
+        disable 'InvalidPackage'
+    }
+}

lib/my_flutter_drag_scale/android/gradle.properties

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+org.gradle.jvmargs=-Xmx1536M

lib/my_flutter_drag_scale/android/settings.gradle

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+rootProject.name = 'flutter_drag_scale'

lib/my_flutter_drag_scale/android/src/main/AndroidManifest.xml

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+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+  package="com.example.flutter_drag_scale">
+</manifest>

lib/my_flutter_drag_scale/android/src/main/java/com/example/flutter_drag_scale/FlutterDragScalePlugin.java

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+package com.example.flutter_drag_scale;
+
+import io.flutter.plugin.common.MethodCall;
+import io.flutter.plugin.common.MethodChannel;
+import io.flutter.plugin.common.MethodChannel.MethodCallHandler;
+import io.flutter.plugin.common.MethodChannel.Result;
+import io.flutter.plugin.common.PluginRegistry.Registrar;
+
+/** FlutterDragScalePlugin */
+public class FlutterDragScalePlugin implements MethodCallHandler {
+  /** Plugin registration. */
+  public static void registerWith(Registrar registrar) {
+    final MethodChannel channel = new MethodChannel(registrar.messenger(), "flutter_drag_scale");
+    channel.setMethodCallHandler(new FlutterDragScalePlugin());
+  }
+
+  @Override
+  public void onMethodCall(MethodCall call, Result result) {
+    if (call.method.equals("getPlatformVersion")) {
+      result.success("Android " + android.os.Build.VERSION.RELEASE);
+    } else {
+      result.notImplemented();
+    }
+  }
+}