From 1a0b0092e0deba07b7dcb543a837fbc116584389 Mon Sep 17 00:00:00 2001
From: Makoto Onuki <omakoto@google.com>
Date: Thu, 30 Sep 2010 15:39:22 -0700
Subject: [PATCH] Add "Clear WebView cache" button to debug preference

Change-Id: I317b57cb06b071f9574077b58998aafcb5e0dff8
---
 res/layout/debug.xml                          | 32 +++++++++++--------
 res/values/strings.xml                        |  2 ++
 .../email/activity/setup/DebugFragment.java   | 26 ++++++++++++++-
 3 files changed, 46 insertions(+), 14 deletions(-)

diff --git a/res/layout/debug.xml b/res/layout/debug.xml
index af67b2634..471438275 100644
--- a/res/layout/debug.xml
+++ b/res/layout/debug.xml
@@ -4,9 +4,9 @@
      Licensed under the Apache License, Version 2.0 (the "License");
      you may not use this file except in compliance with the License.
      You may obtain a copy of the License at
-  
+
           http://www.apache.org/licenses/LICENSE-2.0
-  
+
      Unless required by applicable law or agreed to in writing, software
      distributed under the License is distributed on an "AS IS" BASIS,
      WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
@@ -20,17 +20,17 @@
     android:layout_height="wrap_content"
     >
     <TextView
-    	android:id="@+id/version"
-    	android:layout_width="match_parent"
-    	android:layout_height="wrap_content"
-    	android:text="@string/debug_version_fmt"
-    	/>
+        android:id="@+id/version"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:text="@string/debug_version_fmt"
+        />
     <CheckBox
-    	android:id="@+id/debug_logging"
-    	android:layout_width="wrap_content"
-    	android:layout_height="wrap_content"
-    	android:text="@string/debug_enable_debug_logging_label"
-    	/>
+        android:id="@+id/debug_logging"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="@string/debug_enable_debug_logging_label"
+        />
 <!-- EXCHANGE-REMOVE-SECTION-START -->
     <CheckBox
         android:id="@+id/exchange_logging"
@@ -45,4 +45,10 @@
         android:text="@string/debug_enable_exchange_file_logging_label"
     />
 <!-- EXCHANGE-REMOVE-SECTION-END -->
-</LinearLayout>	    
+    <Button
+        android:id="@+id/clear_webview_cache"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="@string/debug_clear_webview_cache"
+    />
+</LinearLayout>
diff --git a/res/values/strings.xml b/res/values/strings.xml
index 79a33418b..a2c5814d9 100644
--- a/res/values/strings.xml
+++ b/res/values/strings.xml
@@ -236,6 +236,8 @@
     <string name="debug_enable_exchange_logging_label" translatable="false">Enable exchange parser logging? (Extremely verbose)</string>
     <!-- Do Not Translate.  Checkbox label, shown only on debug screen -->
     <string name="debug_enable_exchange_file_logging_label" translatable="false">Enable exchange sd card logging?</string>
+    <!-- Do Not Translate.  Button label, shown only on debug screen -->
+    <string name="debug_clear_webview_cache" translatable="false">Clear WebView cache</string>
 
     <!-- The text in the small separator between smart folders and the accounts -->
     <string name="account_folder_list_separator_accounts">Accounts</string>
diff --git a/src/com/android/email/activity/setup/DebugFragment.java b/src/com/android/email/activity/setup/DebugFragment.java
index db8c4c24c..219cf79a1 100644
--- a/src/com/android/email/activity/setup/DebugFragment.java
+++ b/src/com/android/email/activity/setup/DebugFragment.java
@@ -29,12 +29,14 @@ import android.util.Log;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
+import android.webkit.WebView;
 import android.widget.CheckBox;
 import android.widget.CompoundButton;
 import android.widget.TextView;
 import android.widget.CompoundButton.OnCheckedChangeListener;
 
-public class DebugFragment extends Fragment implements OnCheckedChangeListener {
+public class DebugFragment extends Fragment implements OnCheckedChangeListener,
+        View.OnClickListener {
     private TextView mVersionView;
     private CheckBox mEnableDebugLoggingView;
     private CheckBox mEnableExchangeLoggingView;
@@ -74,9 +76,12 @@ public class DebugFragment extends Fragment implements OnCheckedChangeListener {
         mEnableExchangeFileLoggingView.setOnCheckedChangeListener(this);
         //EXCHANGE-REMOVE-SECTION-END
 
+        view.findViewById(R.id.clear_webview_cache).setOnClickListener(this);
+
         return view;
     }
 
+    @Override
     public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
         switch (buttonView.getId()) {
             case R.id.debug_logging:
@@ -98,4 +103,23 @@ public class DebugFragment extends Fragment implements OnCheckedChangeListener {
 
         Email.updateLoggingFlags(getActivity());
     }
+
+    @Override
+    public void onClick(View v) {
+        switch (v.getId()) {
+            case R.id.clear_webview_cache:
+                clearWebViewCache();
+                break;
+        }
+    }
+
+    private void clearWebViewCache() {
+        WebView webview = new WebView(getActivity());
+        try {
+            webview.clearCache(true);
+            Log.w(Email.LOG_TAG, "Cleard WebView cache.");
+        } finally {
+            webview.destroy();
+        }
+    }
 }