try to fix crash under android19

app/src/main/assets/modules/dialogs.js

@@ -1,3 +0,0 @@
-module.exports = function(){
-
-}

app/src/main/assets/sample/图片与图色处理/颜色获取和检测.js

@@ -0,0 +1,12 @@
+if(!requestScreenCapture()){
+  toast("请求截图失败");
+}
+sleep(2000);
+var x = 760;
+var y = 180;
+//获取在点(x, y)处的颜色
+var c = images.pixel(captureScreen(), x, y);
+//显示该颜色
+toast((c >>> 0).toString(16));
+//检测在点(x, y)处是否有颜色0x73bdb6 (模糊比较)
+toast(images.detectsColor(captureScreen(), x, y, 0x73bdb6))