add fast forwarding and rewinding

app/src/main/kotlin/com/simplemobiletools/voicerecorder/fragments/PlayerFragment.kt

@@ -22,6 +22,8 @@ import java.util.*
 import kotlin.collections.ArrayList
 
 class PlayerFragment(context: Context, attributeSet: AttributeSet) : MyViewPagerFragment(context, attributeSet) {
+    private val FAST_FORWARD_SKIP_MS = 10000
+
     private var player: MediaPlayer? = null
     private var progressTimer = Timer()
 
@@ -58,6 +60,14 @@ class PlayerFragment(context: Context, attributeSet: AttributeSet) : MyViewPager
         play_pause_btn.setOnClickListener {
             togglePlayPause()
         }
+
+        player_progress_current.setOnClickListener {
+            skip(false)
+        }
+
+        player_progress_max.setOnClickListener {
+            skip(true)
+        }
     }
 
     @SuppressLint("InlinedApi")
@@ -201,6 +211,17 @@ class PlayerFragment(context: Context, attributeSet: AttributeSet) : MyViewPager
         play_pause_btn.setImageDrawable(drawable)
     }
 
+    private fun skip(forward: Boolean) {
+        val curr = player?.currentPosition ?: return
+        var newProgress = if (forward) curr + FAST_FORWARD_SKIP_MS else curr - FAST_FORWARD_SKIP_MS
+        if (newProgress > player!!.duration) {
+            newProgress = player!!.duration
+        }
+
+        player!!.seekTo(newProgress)
+        resumeSong()
+    }
+
     private fun getIsPlaying() = player?.isPlaying == true
 
     private fun setupColors() {