desc:调整声音之后，焦点回到之前的控件

app/src/main/java/com/yinuo/safetywatcher/watcher/base/BaseActivity.kt

@@ -41,6 +41,8 @@ abstract class BaseActivity : AppCompatActivity() {
 
     var loadingDialog: CommonDialog? = null;
 
+    var lastFocusView: View? = null
+
     override fun onCreate(savedInstanceState: Bundle?) {
         setViewFactory()
         super.onCreate(null)
@@ -188,6 +190,7 @@ abstract class BaseActivity : AppCompatActivity() {
             if (isLeftRightLongPress) {
                 baseBinding.areaSound.visibility = View.GONE
                 volumeUtil.mediaVolume = baseBinding.sbSound.progress
+                lastFocusView?.requestFocus()
                 return true
             }
         } else if (keyCode == KeyEvent.KEYCODE_ENTER) {
@@ -212,6 +215,7 @@ abstract class BaseActivity : AppCompatActivity() {
                 val visibility = baseBinding.areaSound.visibility
                 if (View.GONE == visibility) {
                     baseBinding.areaSound.visibility = View.VISIBLE
+                    lastFocusView = currentFocus
                     baseBinding.sbSound.requestFocus()
                 }
                 var mediaVolume = baseBinding.sbSound.progress