[opt]:update build tools versions

Author: Kilnn

build.gradle

@@ -5,7 +5,7 @@ buildscript {
         jcenter()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:2.3.1'
+        classpath 'com.android.tools.build:gradle:2.3.3'
         classpath 'com.github.dcendents:android-maven-gradle-plugin:1.5' // Add this line
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files

library/build.gradle

@@ -4,7 +4,7 @@ group='com.github.kilnn'
 
 android {
     compileSdkVersion 25
-    buildToolsVersion "25.0.0"
+    buildToolsVersion "25.0.3"
 
     defaultConfig {
         minSdkVersion 8

library/src/main/java/com/github/kilnn/diffuse/DiffuseLayout.java

@@ -17,7 +17,7 @@
 
 /**
  * Created by Kilnn on 2017/3/20.
- * 参考：http://blog.csdn.net/airsaid/article/details/52683193
+ * Reference:http://blog.csdn.net/airsaid/article/details/52683193
  */
 
 public class DiffuseLayout extends LinearLayout {
@@ -64,9 +64,11 @@ public DiffuseLayout(Context context, AttributeSet attrs, int defStyleAttr, int
 
     private void init(Context context, AttributeSet attrs, int defStyleAttr) {
         Drawable bg = getBackground();
-        if (bg != null && bg instanceof ColorDrawable) {
-            mCenterColor = ((ColorDrawable) bg).getColor();
-            setBackgroundDrawable(null);
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
+            if (bg != null && bg instanceof ColorDrawable) {
+                mCenterColor = ((ColorDrawable) bg).getColor();
+                setBackgroundDrawable(null);
+            }
         }
         mDiffuseColor = mCenterColor;
         if (attrs != null) {

sample/build.gradle

@@ -2,7 +2,7 @@ apply plugin: 'com.android.application'
 
 android {
     compileSdkVersion 25
-    buildToolsVersion "25.0.0"
+    buildToolsVersion "25.0.3"
     defaultConfig {
         applicationId "com.github.kilnn.diffuse.sample"
         minSdkVersion 9

sample/src/main/res/layout/activity_main.xml

@@ -10,19 +10,20 @@
     <com.github.kilnn.diffuse.DiffuseLayout
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
+        android:background="#ff0000"
+        android:gravity="center"
         app:diffuse_color="#ff0000"
         app:diffuse_count="3"
         app:diffuse_every_time="20"
         app:diffuse_width="10dp"
-        android:background="#ff0000"
         app:layout_constraintBottom_toBottomOf="parent"
         app:layout_constraintLeft_toLeftOf="parent"
         app:layout_constraintRight_toRightOf="parent"
         app:layout_constraintTop_toTopOf="parent">
 
         <TextView
-            android:layout_width="100dp"
-            android:layout_height="100dp"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
             android:text="Hello World!"/>
 
     </com.github.kilnn.diffuse.DiffuseLayout>