Add TimeCountDownStrategy & demo

app/src/main/java/com/yy/mobile/rollingtext/MainActivity.java

@@ -18,6 +18,7 @@
 import java.util.Arrays;
 import java.util.Date;
 import java.util.List;
+import java.util.Locale;
 
 public class MainActivity extends AppCompatActivity {
 
@@ -68,6 +69,22 @@ public void run() {
             }
         }, 2000L);
 
+        final RollingTextView countDown = findViewById(R.id.rollingTextView4);
+        countDown.addCharOrder(CharOrder.Number);
+        countDown.addCharOrder(":");
+        countDown.setAnimationDuration(500L);
+        countDown.setAnimationInterpolator(new AccelerateDecelerateInterpolator());
+        countDown.setCharStrategy(Strategy.TimeCountDownAnimation(Direction.SCROLL_DOWN));
+        handler.post(new Runnable() {
+            @Override
+            public void run() {
+                Date date = new Date();
+                date.setTime(System.currentTimeMillis());
+                countDown.setText(new SimpleDateFormat("HH:mm:ss", Locale.getDefault()).format(date));
+                handler.postDelayed(this, 1000L);
+            }
+        });
+
         final RollingTextView stickyText = findViewById(R.id.stickyText);
         stickyText.setAnimationDuration(3000L);
         stickyText.addCharOrder("0123456789abcdef");

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

@@ -103,11 +103,35 @@
         android:text="CarryBit"
         android:textSize="14sp" />
 
+    <com.yy.mobile.rollingtextview.RollingTextView
+        android:id="@+id/rollingTextView4"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_below="@+id/rollingTextView3"
+        android:layout_centerHorizontal="true"
+        android:gravity="center"
+        android:text="0"
+        android:textColor="#ffff00ff"
+        android:textSize="35sp"
+        android:textStyle="italic" />
+
+    <com.yy.mobile.rollingtextview.RollingTextView
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_alignBottom="@+id/rollingTextView4"
+        android:layout_alignParentLeft="true"
+        android:layout_marginLeft="40dp"
+        android:layout_toLeftOf="@+id/rollingTextView4"
+        android:gravity="start|center_vertical"
+        android:padding="10dp"
+        android:text="CountDown"
+        android:textSize="14sp" />
+
     <RelativeLayout
         android:id="@+id/stickyLayout"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
-        android:layout_below="@id/rollingTextView3"
+        android:layout_below="@id/rollingTextView4"
         android:layout_marginTop="10dp">
 
         <com.yy.mobile.rollingtextview.RollingTextView

rollingtextview/src/main/java/com/yy/mobile/rollingtextview/strategy/Strategy.kt

@@ -69,4 +69,13 @@ object Strategy {
     @JvmStatic
     fun StickyAnimation(factor: Double): CharOrderStrategy =
             StickyStrategy(factor)
+
+    /**
+     * 倒计时动画:
+     * 保持相同顺序
+     *
+     * the animation use for count down, all the character are same direction
+     */
+    @JvmStatic
+    fun TimeCountDownAnimation(direction: Direction): CharOrderStrategy = TimeCountDownStrategy(direction)
 }

rollingtextview/src/main/java/com/yy/mobile/rollingtextview/strategy/TimeCountDownStrategy.kt

@@ -0,0 +1,21 @@
+package com.yy.mobile.rollingtextview.strategy
+
+/**
+ * Created by qiu on 2018/10/10.
+ * E-mail: [email protected]
+ * YY: 909017428
+ */
+open class TimeCountDownStrategy(private val direction: Direction) : SimpleCharOrderStrategy() {
+
+    override fun findCharOrder(
+            sourceChar: Char,
+            targetChar: Char,
+            index: Int,
+            order: Iterable<Char>?): Pair<List<Char>, Direction> {
+
+        return if (sourceChar == targetChar) {
+            listOf(targetChar) to direction
+
+        } else listOf(sourceChar, targetChar) to direction
+    }
+}