Added in-app review (#4489)

app/build.gradle

@@ -152,6 +152,7 @@ dependencies {
     // free build hack: skip some dependencies
     if (!doFreeBuild()) {
         playImplementation project(":core")
+        implementation 'com.google.android.play:core:1.8.0'
     } else {
         System.out.println("app: free build hack, skipping some dependencies")
     }

app/src/play/java/de/danoeh/antennapod/dialog/RatingDialog.java

@@ -0,0 +1,122 @@
+package de.danoeh.antennapod.dialog;
+
+import android.app.Activity;
+
+import android.content.Context;
+import android.content.SharedPreferences;
+
+import androidx.annotation.VisibleForTesting;
+import android.util.Log;
+import android.widget.Toast;
+
+import java.lang.ref.WeakReference;
+import java.util.concurrent.TimeUnit;
+
+import com.google.android.play.core.review.ReviewInfo;
+import com.google.android.play.core.review.ReviewManager;
+import com.google.android.play.core.review.ReviewManagerFactory;
+import com.google.android.play.core.tasks.Task;
+
+public class RatingDialog {
+
+    private RatingDialog() {
+    }
+
+    private static final String TAG = RatingDialog.class.getSimpleName();
+    private static final int AFTER_DAYS = 14;
+
+    private static WeakReference<Context> mContext;
+    private static SharedPreferences mPreferences;
+
+    private static final String PREFS_NAME = "RatingPrefs";
+    private static final String KEY_RATED = "KEY_WAS_RATED";
+    private static final String KEY_FIRST_START_DATE = "KEY_FIRST_HIT_DATE";
+    private static final String KEY_NUMBER_OF_REVIEWS = "NUMBER_OF_REVIEW_ATTEMPTS";
+
+    public static void init(Context context) {
+        mContext = new WeakReference<>(context);
+        mPreferences = context.getSharedPreferences(PREFS_NAME, Context.MODE_PRIVATE);
+
+        long firstDate = mPreferences.getLong(KEY_FIRST_START_DATE, 0);
+        if (firstDate == 0) {
+            resetStartDate();
+        }
+    }
+
+    public static void check() {
+        if (shouldShow()) {
+            try {
+                showInAppReview();
+            } catch (Exception e) {
+                Log.e(TAG, Log.getStackTraceString(e));
+            }
+        }
+    }
+
+    private static void showInAppReview() {
+        Context context = mContext.get();
+        if (context == null) {
+            return;
+        }
+
+        ReviewManager manager = ReviewManagerFactory.create(context);
+        Task<ReviewInfo> request = manager.requestReviewFlow();
+
+        request.addOnCompleteListener(task -> {
+            if (task.isSuccessful()) {
+                ReviewInfo reviewInfo = task.getResult();
+                Task<Void> flow = manager.launchReviewFlow((Activity) context, reviewInfo);
+                flow.addOnCompleteListener(task1 -> {
+                    int previousAttempts = mPreferences.getInt(KEY_NUMBER_OF_REVIEWS, 0);
+                    if (previousAttempts >= 3) {
+                        saveRated();
+                    } else {
+                        resetStartDate();
+                        mPreferences
+                                .edit()
+                                .putInt(KEY_NUMBER_OF_REVIEWS, previousAttempts + 1)
+                                .apply();
+                    }
+                    Log.i("ReviewDialog", "Successfully finished in-app review");
+                })
+                        .addOnFailureListener(error -> {
+                            Log.i("ReviewDialog", "failed in reviewing process");
+                        });
+            }
+        })
+                .addOnFailureListener(error -> {
+                    Log.i("ReviewDialog",  "failed to get in-app review request");
+                });
+    }
+
+    private static boolean rated() {
+        return mPreferences.getBoolean(KEY_RATED, false);
+    }
+
+    @VisibleForTesting
+    public static void saveRated() {
+        mPreferences
+                .edit()
+                .putBoolean(KEY_RATED, true)
+                .apply();
+    }
+
+    private static void resetStartDate() {
+        mPreferences
+                .edit()
+                .putLong(KEY_FIRST_START_DATE, System.currentTimeMillis())
+                .apply();
+    }
+
+    private static boolean shouldShow() {
+        if (rated()) {
+            return false;
+        }
+
+        long now = System.currentTimeMillis();
+        long firstDate = mPreferences.getLong(KEY_FIRST_START_DATE, now);
+        long diff = now - firstDate;
+        long diffDays = TimeUnit.DAYS.convert(diff, TimeUnit.MILLISECONDS);
+        return diffDays >= AFTER_DAYS;
+    }
+}