Add in-app Donation link in Termux Settings for non google playstore releases

The `TermuxConstants` class has been updated to `v0.22.0`. Check its Changelog sections for info on changes.

app/src/main/java/com/termux/app/activities/SettingsActivity.java

@@ -11,6 +11,8 @@ import androidx.preference.PreferenceFragmentCompat;
 import com.termux.R;
 import com.termux.app.models.ReportInfo;
 import com.termux.app.models.UserAction;
+import com.termux.shared.interact.ShareUtils;
+import com.termux.shared.packages.PackageUtils;
 import com.termux.shared.termux.TermuxConstants;
 import com.termux.shared.termux.TermuxUtils;
 
@@ -44,10 +46,11 @@ public class SettingsActivity extends AppCompatActivity {
         public void onCreatePreferences(Bundle savedInstanceState, String rootKey) {
             setPreferencesFromResource(R.xml.root_preferences, rootKey);
 
-            setAboutOnPreferenceClickListener();
+            configureAboutPreference();
+            configureDonatePreference();
         }
 
-        private void setAboutOnPreferenceClickListener() {
+        private void configureAboutPreference() {
             Context context = getContext();
             Preference about = findPreference("about");
             if (context != null && about != null) {
@@ -70,6 +73,31 @@ public class SettingsActivity extends AppCompatActivity {
                 });
             }
         }
+
+        private void configureDonatePreference() {
+            Context context = getContext();
+            Preference donate = findPreference("donate");
+            if (context != null && donate != null) {
+                String signingCertificateSHA256Digest = PackageUtils.getSigningCertificateSHA256DigestForPackage(context);
+                if (signingCertificateSHA256Digest != null) {
+                    // If APK is a Google Playstore release, then do not show the donation link
+                    // since Termux isn't exempted from the playstore policy donation links restriction
+                    // Check Fund solicitations: https://pay.google.com/intl/en_in/about/policy/
+                    String apkRelease = TermuxUtils.getAPKRelease(signingCertificateSHA256Digest);
+                    if (apkRelease == null || apkRelease.equals(TermuxConstants.APK_RELEASE_GOOGLE_PLAYSTORE_SIGNING_CERTIFICATE_SHA256_DIGEST)) {
+                        donate.setVisible(false);
+                        return;
+                    } else {
+                        donate.setVisible(true);
+                    }
+                }
+
+                donate.setOnPreferenceClickListener(preference -> {
+                    ShareUtils.openURL(context, TermuxConstants.TERMUX_DONATE_URL);
+                    return true;
+                });
+            }
+        }
     }
 
 }

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

@@ -170,7 +170,10 @@
                 <string name="termux_soft_keyboard_enabled_only_if_no_hardware_on">Soft keyboard will be enabled only if no hardware keyboard is connected.</string>
 
 
-    <!-- About Preferences -->
-    <string name="about_preferences_title">About</string>
+    <!-- About Preference -->
+    <string name="about_preference_title">About</string>
+
+    <!-- Donate Preference -->
+    <string name="donate_preference_title">Donate</string>
 
 </resources>

app/src/main/res/xml/root_preferences.xml

@@ -8,8 +8,14 @@
 
     <Preference
         app:key="about"
-        app:title="@string/about_preferences_title"
+        app:title="@string/about_preference_title"
         app:persistent="false"/>
     <!-- app:layout="@layout/preference_markdown_text" -->
 
+    <Preference
+        app:key="donate"
+        app:title="@string/donate_preference_title"
+        app:persistent="false"
+        app:isPreferenceVisible="false"/>
+
 </PreferenceScreen>