auto rotation

tomoima525 · Aug 26, 2017 · 04b9fb2 · 04b9fb2
1 parent 06db076
commit 04b9fb2
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Showing 3 changed files with 49 additions and 3 deletions.
diff --git a/app/build.gradle b/app/build.gradle
@@ -30,6 +30,8 @@ dependencies {
     implementation 'com.android.support:design:26.0.1'
     implementation 'com.android.support.constraint:constraint-layout:1.0.2'
     implementation 'com.jakewharton:butterknife:8.8.1'
+    implementation 'io.reactivex.rxjava2:rxjava:2.1.1'
+    implementation 'io.reactivex.rxjava2:rxandroid:2.0.1'
     kapt 'com.jakewharton:butterknife-compiler:8.8.1'
     testImplementation 'junit:junit:4.12'
     androidTestImplementation 'com.android.support.test:runner:1.0.0'

diff --git a/app/src/main/java/com/tomoima/infiniterotation/InfiniteRotationView.kt b/app/src/main/java/com/tomoima/infiniterotation/InfiniteRotationView.kt
@@ -10,6 +10,10 @@ import android.view.View
 import android.widget.RelativeLayout
 import butterknife.BindView
 import butterknife.ButterKnife
+import io.reactivex.Flowable
+import io.reactivex.android.schedulers.AndroidSchedulers
+import io.reactivex.disposables.Disposable
+import java.util.concurrent.TimeUnit
 
 /**
  * Created by tomoaki on 2017/08/13.
@@ -23,6 +27,8 @@ class InfiniteRotationView(context: Context, attributeSet: AttributeSet)
     private val layoutManager: LinearLayoutManager
     private lateinit var onScrollListener: OnScrollListener
 
+    private var dispose: Disposable? = null
+
     init {
         View.inflate(context, R.layout.view_infinite_rotation, this)
         ButterKnife.bind(this)
@@ -38,15 +44,41 @@ class InfiniteRotationView(context: Context, attributeSet: AttributeSet)
         adapter.itemCount
                 .takeIf { it > 1 }
                 ?.apply {
-                    onScrollListener = OnScrollListener(adapter.itemCount, layoutManager)
+                    onScrollListener = OnScrollListener(
+                            adapter.itemCount,
+                            layoutManager,
+                            {
+                                // When dragging, we assume user swiped. So we will stop auto rotation
+                                if (it == RecyclerView.SCROLL_STATE_DRAGGING) {
+                                    dispose?.dispose()
+                                }
+                            }
+                    )
                     recyclerView.addOnScrollListener(onScrollListener)
                     recyclerView.scrollToPosition(1)
                 }
     }
 
+    fun autoScroll(listSize: Int, intervalInMillis: Long) {
+        dispose?.let {
+            if(!it.isDisposed) return
+        }
+        dispose = Flowable.interval(intervalInMillis, TimeUnit.MILLISECONDS)
+                .map { it % listSize + 1 }
+                .observeOn(AndroidSchedulers.mainThread())
+                .subscribe {
+                    recyclerView.smoothScrollToPosition(it.toInt() + 1)
+                }
+    }
+
+    fun stopAutoScroll() {
+        dispose?.let(Disposable::dispose)
+    }
+
     class OnScrollListener(
             val itemCount: Int,
-            val layoutManager: LinearLayoutManager) : RecyclerView.OnScrollListener() {
+            val layoutManager: LinearLayoutManager,
+            val stateChanged: (Int) -> Unit) : RecyclerView.OnScrollListener() {
         override fun onScrolled(recyclerView: RecyclerView?, dx: Int, dy: Int) {
             super.onScrolled(recyclerView, dx, dy)
             val firstItemVisible = layoutManager.findFirstVisibleItemPosition()
@@ -59,5 +91,10 @@ class InfiniteRotationView(context: Context, attributeSet: AttributeSet)
                 recyclerView?.scrollToPosition(itemCount - 1)
             }
         }
+
+        override fun onScrollStateChanged(recyclerView: RecyclerView?, newState: Int) {
+            super.onScrollStateChanged(recyclerView, newState)
+            stateChanged(newState)
+        }
     }
 }
diff --git a/app/src/main/java/com/tomoima/infiniterotation/MainActivity.kt b/app/src/main/java/com/tomoima/infiniterotation/MainActivity.kt
@@ -15,7 +15,14 @@ class MainActivity : AppCompatActivity() {
         super.onCreate(savedInstanceState)
         setContentView(R.layout.activity_main)
         ButterKnife.bind(this)
-        rotationView.setAdapter(InfiniteRotationAdapter(createItems()))
+        val items = createItems()
+        rotationView.setAdapter(InfiniteRotationAdapter(items))
+        rotationView.autoScroll(items.size, 2000)
+    }
+
+    override fun onDestroy() {
+        super.onDestroy()
+        rotationView.stopAutoScroll()
     }
 
     private fun createItems() = Array(4, { i ->