Tell user about errors in toasts

Author: 0xf104a

app/src/main/java/com/polar/mirror/ActionPanelController.java

@@ -5,6 +5,7 @@
 import android.view.animation.Animation;
 import android.view.animation.AnimationUtils;
 import android.os.Handler;
+import android.widget.Toast;
 
 import androidx.annotation.NonNull;
 
@@ -21,6 +22,8 @@ public class ActionPanelController implements View.OnClickListener {
     private Handler mHideHandler;
     private Runnable mHideRunnable;
     private final int hideMs;
+    private boolean isFirstTimeHide = true;
+    private final Context mContext;
     public ActionPanelController(Context context, View panelView, View overlayView){
         mPanelView = panelView;
         mOverlayView = overlayView;
@@ -30,6 +33,7 @@ public ActionPanelController(Context context, View panelView, View overlayView){
         if(hideMs < 0){
             throw new RuntimeException("Bad configuration: negative hideMs");
         }
+        mContext = context;
         setupAnimations();
         setupAutoHide();
     }
@@ -82,6 +86,11 @@ public void onAnimationRepeat(Animation animation) {
     }
 
     private void hidePanel(){
+        if(isFirstTimeHide){
+            final String toastText = mContext.getString(R.string.tap_to_show_actions);
+            Toast.makeText(mContext, toastText, Toast.LENGTH_LONG).show();
+            isFirstTimeHide = false;
+        }
         mPanelView.startAnimation(mSlideDownAnimation);
         mOverlayView.startAnimation(mSlideDownAnimation);
         mPanelVisible = false;

app/src/main/java/com/polar/mirror/MainActivity.java

@@ -6,13 +6,13 @@
 import androidx.camera.core.CameraSelector;
 import androidx.camera.core.Preview;
 import androidx.camera.view.PreviewView;
-import androidx.lifecycle.LifecycleOwner;
 import androidx.camera.lifecycle.ProcessCameraProvider;
 
 import android.os.Bundle;
 import android.util.Log;
 import android.view.View;
 import android.widget.ImageView;
+import android.widget.Toast;
 
 import com.google.android.material.floatingactionbutton.FloatingActionButton;
 
@@ -46,6 +46,8 @@ protected void onCreate(Bundle savedInstanceState) {
         try {
             startCamera();
         } catch (ExecutionException | InterruptedException e) {
+            final String toastText = getString(R.string.can_not_start_camera);
+            Toast.makeText(this, toastText, Toast.LENGTH_LONG).show();
             e.printStackTrace();
         }
 
@@ -121,8 +123,8 @@ private void startCamera() throws ExecutionException, InterruptedException {
                     .requireLensFacing(CameraSelector.LENS_FACING_FRONT)
                     .build();
             cameraProvider.unbindAll();
-            cameraProvider.bindToLifecycle((LifecycleOwner)this, cameraSelector, preview);
-            mFreezeController.onCameraInitialized(cameraProvider, (LifecycleOwner)this);
+            cameraProvider.bindToLifecycle(this, cameraSelector, preview);
+            mFreezeController.onCameraInitialized(cameraProvider, this);
         } catch (Exception e) {
             e.printStackTrace();
         }

app/src/main/res/values/strings.xml

@@ -3,4 +3,6 @@
     <string name="exit">Exit app</string>
     <string name="freeze">Freeze</string>
     <string name="stop_view_desc">Image displaying stop-frame</string>
+    <string name="tap_to_show_actions">Tap anywhere to show actions again</string>
+    <string name="can_not_start_camera">Can not access camera</string>
 </resources>