Notify user if proxy is not ready when they try to load a URL

app/src/main/java/acr/browser/lightning/activity/BrowserActivity.java

@@ -650,6 +650,20 @@ public class BrowserActivity extends ThemableActivity implements BrowserControll
 
 	}
 
+	public boolean isProxyReady() {
+		if (mPreferences.getProxyChoice() == 2) {
+			if (!mI2PHelper.isI2PAndroidRunning()) {
+				Utils.showToast(this, getString(R.string.i2p_not_running));
+				return false;
+			} else if (!mI2PHelper.areTunnelsActive()) {
+				Utils.showToast(this, getString(R.string.i2p_tunnels_not_ready));
+				return false;
+			}
+		}
+
+		return true;
+	}
+
 	private boolean isTablet() {
 		return (getResources().getConfiguration().screenLayout & Configuration.SCREENLAYOUT_SIZE_MASK) == Configuration.SCREENLAYOUT_SIZE_XLARGE;
 	}

app/src/main/java/acr/browser/lightning/controller/BrowserController.java

@@ -54,5 +54,7 @@ public interface BrowserController {
 
 	boolean isIncognito();
 
+	boolean isProxyReady();
+
 	int getMenu();
 }

app/src/main/java/acr/browser/lightning/view/LightningView.java

@@ -526,6 +526,12 @@ public class LightningView {
 	}
 
 	public synchronized void reload() {
+		// Check if configured proxy is available
+		if (!mBrowserController.isProxyReady()) {
+			// User has been notified
+			return;
+		}
+
 		if (mWebView != null) {
 			mWebView.reload();
 		}
@@ -611,6 +617,12 @@ public class LightningView {
 	}
 
 	public synchronized void loadUrl(String url) {
+		// Check if configured proxy is available
+		if (!mBrowserController.isProxyReady()) {
+			// User has been notified
+			return;
+		}
+
 		if (mWebView != null) {
 			mWebView.loadUrl(url);
 		}
@@ -815,6 +827,12 @@ public class LightningView {
 
 		@Override
 		public boolean shouldOverrideUrlLoading(WebView view, String url) {
+			// Check if configured proxy is available
+			if (!mBrowserController.isProxyReady()) {
+				// User has been notified
+				return true;
+			}
+
 			if (mBrowserController.isIncognito()) {
 				return super.shouldOverrideUrlLoading(view, url);
 			}

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

@@ -167,6 +167,8 @@
     <string name="use_tor_prompt">It looks like you have Orbot installed. Do you want to use Tor?</string>
     <string name="use_i2p_prompt">It looks like you have I2P installed. Do you want to use I2P?</string>
     <string name="install_orbot">Please install Orbot in order to proxy with Tor.</string>
+    <string name="i2p_not_running">I2P is not running.</string>
+    <string name="i2p_tunnels_not_ready">I2P tunnels are not ready yet.</string>
     <string name="yes">Yes</string>
     <string name="no">No</string>
     <string name="clear_cookies_exit">Clear cookies on exit</string>