fix: #18

Author: JayGoo

library/src/main/java/jaygoo/widget/wlv/RenderView.java

@@ -8,6 +8,7 @@
 
 import java.lang.ref.WeakReference;
 import java.util.List;
+
 /**
  * ================================================
  * 作    者：JayGoo
@@ -22,12 +23,15 @@ public abstract class RenderView extends SurfaceView implements SurfaceHolder.Ca
     private boolean isStartAnim = false;
     private final static Object surfaceLock = new Object();
     private RenderThread renderThread;
+
     /**
      * 绘制背景，防止开始时黑屏
      * 子View可以执行此方法
+     *
      * @param canvas
      */
     protected abstract void doDrawBackground(Canvas canvas);
+
     /**
      * 渲染surfaceView的回调方法。
      *
@@ -57,19 +61,20 @@ private static class RenderThread extends Thread {
         private boolean running = false;
         private boolean destoryed = false;
         private boolean isPause = false;
+
         public RenderThread(RenderView renderView) {
             super("RenderThread");
             this.renderView = new WeakReference<>(renderView);
         }
 
-        private SurfaceHolder getSurfaceHolder(){
-            if (getRenderView() != null ){
+        private SurfaceHolder getSurfaceHolder() {
+            if (getRenderView() != null) {
                 return getRenderView().getHolder();
             }
             return null;
         }
 
-        private RenderView getRenderView(){
+        private RenderView getRenderView() {
             return renderView.get();
         }
 
@@ -80,7 +85,7 @@ public void run() {
                 synchronized (surfaceLock) {
 
                     //这里并没有真正的结束Thread，防止部分手机连续调用同一Thread出错
-                    while (isPause){
+                    while (isPause) {
                         try {
                             surfaceLock.wait();
                         } catch (InterruptedException e) {
@@ -98,7 +103,7 @@ public void run() {
                                 }
                                 getSurfaceHolder().unlockCanvasAndPost(canvas);
                             }
-                        }else {
+                        } else {
                             running = false;
                         }
 
@@ -123,7 +128,6 @@ public void setRun(boolean isRun) {
     }
 
 
-
     @Override
     public void surfaceCreated(SurfaceHolder holder) {
         renderer = onCreateRenderer();
@@ -138,8 +142,8 @@ public void surfaceCreated(SurfaceHolder holder) {
      * 解锁暂停，继续执行绘制任务
      * 默认当Resume时不自动启动动画
      */
-    public void onResume(){
-        synchronized (surfaceLock){
+    public void onResume() {
+        synchronized (surfaceLock) {
             if (renderThread != null) {
                 renderThread.isPause = false;
                 surfaceLock.notifyAll();
@@ -149,8 +153,8 @@ public void onResume(){
 
 
     //假暂停，并没有结束Thread
-    public void onPause(){
-        synchronized (surfaceLock){
+    public void onPause() {
+        synchronized (surfaceLock) {
             if (renderThread != null) {
                 renderThread.isPause = true;
             }
@@ -172,9 +176,9 @@ public void surfaceDestroyed(SurfaceHolder holder) {
     }
 
     public void onWindowFocusChanged(boolean hasFocus) {
-        if (hasFocus && isStartAnim){
+        if (hasFocus && isStartAnim) {
             startAnim();
-        }else {
+        } else {
             startThread();
         }
     }
@@ -200,12 +204,12 @@ private void render(Canvas canvas, long millisPassed) {
         }
     }
 
-    public void startAnim(){
+    public void startAnim() {
         isStartAnim = true;
         startThread();
     }
 
-    private void startThread(){
+    private void startThread() {
 
         if (renderThread != null && !renderThread.running) {
             renderThread.setRun(true);
@@ -214,30 +218,30 @@ private void startThread(){
                     renderThread.start();
                 }
 
-            }catch (RuntimeException e){
+            } catch (Exception e) {
                 e.printStackTrace();
             }
 
         }
     }
 
-    public void stopAnim(){
+    public void stopAnim() {
         isStartAnim = false;
         if (renderThread != null && renderThread.running) {
             renderThread.setRun(false);
             renderThread.interrupt();
         }
     }
 
-    public boolean isRunning(){
+    public boolean isRunning() {
         if (renderThread != null) {
             return renderThread.running;
         }
         return false;
     }
 
     //释放相关资源，防止内存泄漏
-    public void release(){
+    public void release() {
         if (getHolder() != null && getHolder().getSurface() != null) {
             getHolder().getSurface().release();
             getHolder().removeCallback(this);

library/src/main/java/jaygoo/widget/wlv/WaveLineView.java

@@ -167,17 +167,16 @@ protected void onRender(Canvas canvas, long millisPassed) {
             resetPaths();
             softerChangeVolume();
 
-            //双重判断确保必要参数正常
-            if (isParametersNull()) {
-                initDraw(canvas);
-            }
-            if (isParametersNull()) {
-                return;
-            }
-
             //波形函数的值
             float curY;
             for (int i = 0; i <= samplingSize; i++) {
+                //双重判断确保必要参数正常
+                if (isParametersNull()) {
+                    initDraw(canvas);
+                    if (isParametersNull()) {
+                        return;
+                    }
+                }
                 float x = samplingX[i];
                 curY = (float) (amplitude * calcValue(mapX[i], offset));
                 for (int n = 0; n < paths.size(); n++) {
@@ -415,6 +414,7 @@ public void setVolume(int volume) {
 
     public void setBackGroundColor(int backGroundColor) {
         this.backGroundColor = backGroundColor;
+        this.isTransparentMode = (backGroundColor == Color.TRANSPARENT);
     }
 
     public void setLineColor(int lineColor) {