diff --git a/app/src/main/java/com/github/xiaogegechen/trackview/MainActivity.java b/app/src/main/java/com/github/xiaogegechen/trackview/MainActivity.java
index 0387a21..8436332 100644
--- a/app/src/main/java/com/github/xiaogegechen/trackview/MainActivity.java
+++ b/app/src/main/java/com/github/xiaogegechen/trackview/MainActivity.java
@@ -5,14 +5,14 @@
 import android.util.Log;
 import android.view.View;
 import android.widget.TextView;
+import android.widget.Toast;
 
 import com.github.xiaogegechen.library.TrackView;
 
 public class MainActivity extends AppCompatActivity {
 
     private static final String TAG = "MainActivity";
-
-    private boolean state = false;
+    private int num = 0;
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
@@ -22,7 +22,6 @@ protected void onCreate(Bundle savedInstanceState) {
         final TrackView trackView = findViewById (R.id.track_view);
         final TextView textView = findViewById (R.id.text_view);
 
-
         textView.setOnClickListener (new View.OnClickListener () {
             @Override
             public void onClick(View v) {
@@ -33,16 +32,30 @@ public void onClick(View v) {
         trackView.setOnClickListener (new View.OnClickListener () {
             @Override
             public void onClick(View v) {
+                textView.setText ("WORLD");
+                Toast.makeText (MainActivity.this,  "click", Toast.LENGTH_SHORT).show ();
+            }
+        });
 
-                TrackView.Position position = trackView.getPosition ();
-                Log.d (TAG, "onClick: " + position);
+        findViewById (R.id.close).setOnClickListener (new View.OnClickListener () {
+            @Override
+            public void onClick(View v) {
+                trackView.close ();
+            }
+        });
 
-                if(!state){
-                    trackView.close ();
-                }else{
-                    trackView.open ();
-                }
-                state = !state;
+        findViewById (R.id.open).setOnClickListener (new View.OnClickListener () {
+            @Override
+            public void onClick(View v) {
+                trackView.open ();
+            }
+        });
+
+        findViewById (R.id.change).setOnClickListener (new View.OnClickListener () {
+            @Override
+            public void onClick(View v) {
+                trackView.setText ("num:"+num);
+                num++;
             }
         });
 
diff --git a/app/src/main/res/layout/activity_main.xml b/app/src/main/res/layout/activity_main.xml
index 74849a4..9527729 100644
--- a/app/src/main/res/layout/activity_main.xml
+++ b/app/src/main/res/layout/activity_main.xml
@@ -3,8 +3,8 @@
     xmlns:app="http://schemas.android.com/apk/res-auto"
     android:background="#00FFFFFF"
     android:layout_width="match_parent"
+    android:orientation="vertical"
     android:layout_height="match_parent">
-
     <TextView
         android:id="@+id/text_view"
         android:layout_width="match_parent"
@@ -12,25 +12,31 @@
         android:gravity="center"
         android:text="HELLO"
         android:textSize="50sp" />
+    <LinearLayout
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:orientation="vertical">
+        <Button
+            android:id="@+id/open"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:text="展开"/>
+        <Button
+            android:id="@+id/close"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:text="关闭"/>
+        <Button
+            android:id="@+id/change"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:text="改变文字"/>
+    </LinearLayout>
     <com.github.xiaogegechen.library.TrackView
-        android:padding="3dp"
-        android:layout_marginLeft="10dp"
         android:id="@+id/track_view"
-        android:layout_marginTop="30dp"
-        android:layout_width="200dp"
+        android:layout_width="150dp"
         android:layout_height="50dp"
-        app:inner_distance="8dp"
-        app:inner_length="10dp"
-        app:inner_stroke_width="1dp"
-        app:blank_bottom="15dp"
-        app:blank_left="8dp"
-        app:blank_right="8dp"
-        app:blank_top="30dp"
-        app:inner_content_color="#ffffff"
-        app:inner_stroke_color="#000000"
-        app:out_stroke_color="#000000"
-        app:out_stroke_width="1dp"
-        app:inner_text_size="30sp"
-        app:inner_text_color="@color/colorAccent"
-        app:inner_text="hello"/>
+        android:padding="3dp"
+        android:layout_margin="30dp"
+        app:inner_text="下一个回答"/>
 </FrameLayout>
\ No newline at end of file
diff --git a/library/src/main/java/com/github/xiaogegechen/library/TrackView.java b/library/src/main/java/com/github/xiaogegechen/library/TrackView.java
index 209ad51..9f3c946 100644
--- a/library/src/main/java/com/github/xiaogegechen/library/TrackView.java
+++ b/library/src/main/java/com/github/xiaogegechen/library/TrackView.java
@@ -15,7 +15,6 @@
 import android.support.annotation.Nullable;
 import android.util.AttributeSet;
 import android.util.DisplayMetrics;
-import android.util.Log;
 import android.view.MotionEvent;
 import android.view.View;
 import android.view.ViewGroup;
@@ -26,8 +25,6 @@
  */
 public class TrackView extends View {
 
-    private static final String TAG = "TrackView";
-
     // 默认大小
     private static final int SIZE_DEFAULT = 50;
 
@@ -38,7 +35,7 @@ public class TrackView extends View {
     private static final int GO_TO_BOUNDARY_INTERVAL_DEFAULT = 100;
 
     // 合上的默认时长
-    private static final int CLOSE_INTERVAL_DEFAULT = 500;
+    private static final int CLOSE_INTERVAL_DEFAULT = 200;
 
     // 默认控件活动边界留白
     private static final int BLANK_LEFT_DEFAULT = 10;
@@ -47,13 +44,13 @@ public class TrackView extends View {
     private static final int BLANK_BOTTOM_DEFAULT = 10;
 
     // 默认外围线条的颜色
-    private static final int OUT_STROKE_COLOR_DEFAULT = Color.BLACK;
+    private static final int OUT_STROKE_COLOR_DEFAULT = Color.parseColor ("#4A000000");
 
     // 默认的外围线宽
     private static final int OUT_STROKE_WIDTH_DEFAULT = 1;
 
     // 默认的内部线宽
-    private static final int IN_STROKE_WIDTH_DEFAULT = 1;
+    private static final int IN_STROKE_WIDTH_DEFAULT = 2;
 
     // 默认内部线条的颜色
     private static final int IN_STROKE_COLOR_DEFAULT = Color.BLACK;
@@ -535,7 +532,7 @@ public void onAnimationUpdate(ValueAnimator animation) {
                     }
 
                     // 改变view大小
-                    setLayoutParams (params);
+                    requestLayout ();
                 }
             };
         }
@@ -601,7 +598,7 @@ public void onAnimationUpdate(ValueAnimator animation) {
                     }
 
                     // 改变view大小
-                    setLayoutParams (params);
+                    requestLayout ();
                 }
             };
         }