Hold to dismiss, for trikita#20

Instead of dismissing instantly on touch, instead the touch must be held
down for 2 seconds. During this time, the background will fade to be the
same color as the alarm icon, giving a progress indicator.

If you release before 2 seconds, the alarm icon will change into the
text "HOLD" to provide a hint about what needs to happen.

Pressing the home or back button will still dismiss instantly.

src/main/java/trikita/talalarmo/alarm/AlarmActivity.java

@@ -1,24 +1,34 @@
 package trikita.talalarmo.alarm;
 
+import android.animation.Animator;
+import android.animation.ArgbEvaluator;
+import android.animation.ValueAnimator;
 import android.app.Activity;
 import android.content.Context;
 import android.os.Build;
 import android.os.Bundle;
 import android.os.PowerManager;
+import android.view.MotionEvent;
 import android.view.Window;
 import android.view.WindowManager;
 
 import trikita.anvil.RenderableView;
+import trikita.anvil.Anvil;
 import static trikita.anvil.DSL.*;
 
 import trikita.jedux.Action;
 import trikita.talalarmo.Actions;
 import trikita.talalarmo.App;
+import trikita.talalarmo.R;
 import trikita.talalarmo.ui.Theme;
 
 
 public class AlarmActivity extends Activity {
     private PowerManager.WakeLock mWakeLock;
+    private ValueAnimator mAnimator;
+    private int bgColor;
+    private int txt;
+    private boolean canceled;
 
     @Override
     protected void onCreate(Bundle b) {
@@ -37,15 +47,60 @@ protected void onCreate(Bundle b) {
             window.setStatusBarColor(Theme.get(App.getState().settings().theme()).primaryDarkColor);
         }
 
+        txt = R.string.alarm_off;
+        int colorFrom = Theme.get(App.getState().settings().theme()).backgroundColor;
+        int colorTo = Theme.get(App.getState().settings().theme()).accentColor;
+        bgColor = colorFrom;
+        mAnimator = ValueAnimator.ofObject(new ArgbEvaluator(), colorFrom, colorTo);
+        mAnimator.setDuration(2000); // millis
+        mAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
+            @Override
+            public void onAnimationUpdate(ValueAnimator animator) {
+                bgColor = (int) animator.getAnimatedValue();
+                Anvil.render();
+            }
+        });
+        mAnimator.addListener(new Animator.AnimatorListener() {
+            @Override
+            public void onAnimationStart(Animator animator) {
+                canceled = false;
+            }
+            @Override
+            public void onAnimationCancel(Animator animator) {
+                canceled = true;
+                txt = R.string.hold_dismiss_prompt;
+                bgColor = colorFrom;
+                Anvil.render();
+            }
+            @Override
+            public void onAnimationEnd(Animator animator) {
+                if (!canceled) {
+                    stopAlarm();
+                }
+            }
+            @Override
+            public void onAnimationRepeat(Animator animator) {}
+        });
+
         setContentView(new RenderableView(this) {
             public void view() {
                 Theme.materialIcon(() -> {
                     size(FILL, FILL);
-                    text("\ue857"); // "alarm off"
+                    text(txt); // "alarm off"
                     textColor(Theme.get(App.getState().settings().theme()).accentColor);
                     textSize(dip(128));
-                    backgroundColor(Theme.get(App.getState().settings().theme()).backgroundColor);
-                    onClick(v -> stopAlarm());
+                    backgroundColor(bgColor);
+                    onTouch((v, e) -> {
+                        if(e.getAction() == MotionEvent.ACTION_DOWN){
+                            mAnimator.start();
+                            return true;
+                        }
+                        if(e.getAction() == MotionEvent.ACTION_UP){
+                            mAnimator.cancel();
+                            return true;
+                        }
+                        return false;
+                    });
                 });
             }
         });

src/main/res/values/strings.xml

@@ -9,6 +9,8 @@
     <string name="settings_vibration_option">Vibrate</string>
     <string name="settings_volume_increase_option">Fade-in sound</string>
     <string name="tv_start_alarm_text">Tap here\nto set alarm</string>
+    <string name="hold_dismiss_prompt">HOLD</string>
+    <string name="alarm_off" translatable="false">"\ue857"</string>
 
     <string name="hour">1 hour</string>
     <string name="hours">%s hours</string>