Added the SeekBar to change the parameters of WaveView

Affects sample module.
Added SeekBar can change the height which is the trigger of WaveView drop animation.

sample/src/main/java/jp/co/recruit_lifestyle/sample/MainActivity.java

@@ -10,7 +10,10 @@
 import android.view.WindowManager;
 import android.widget.ArrayAdapter;
 import android.widget.ListView;
+import android.widget.SeekBar;
+
 import java.util.ArrayList;
+
 import jp.co.recruit_lifestyle.android.widget.WaveSwipeRefreshLayout;
 
 public class MainActivity extends AppCompatActivity implements WaveSwipeRefreshLayout.OnRefreshListener {
@@ -38,6 +41,24 @@ private void initView() {
     //mWaveSwipeRefreshLayout.setMaxDropHeight(1500);
 
     mListview = (ListView) findViewById(R.id.main_list);
+
+    ((SeekBar) findViewById(R.id.seekbar_of_drop_height)).setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
+      @Override
+      public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
+        // ignore
+      }
+
+      @Override
+      public void onStartTrackingTouch(SeekBar seekBar) {
+        // ignore
+      }
+
+      @Override
+      public void onStopTrackingTouch(SeekBar seekBar) {
+        float scale = (seekBar.getProgress() / 100f);
+        mWaveSwipeRefreshLayout.setMaxDropHeight((int) (mWaveSwipeRefreshLayout.getHeight() * scale));
+      }
+    });
   }
 
   private void setSampleData() {

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

@@ -51,6 +51,14 @@
 
     </jp.co.recruit_lifestyle.android.widget.WaveSwipeRefreshLayout>
 
+    <SeekBar
+        android:id="@+id/seekbar_of_drop_height"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:max="100"
+        android:layout_alignParentBottom="true"
+        />
+
   </RelativeLayout>
 
 </LinearLayout>