Clean app data (keeping the PASSCODE untouched) from ManageSpaceActivity

AndroidManifest.xml

@@ -204,7 +204,8 @@
                        android:resource="@xml/users_and_groups_searchable"/>
         </activity>
         <activity android:name=".ui.activity.ManageSpaceActivity"
-                  android:label="@string/manage_space"/>
+                  android:label="@string/manage_space_title"
+                  android:theme="@style/Theme.ownCloud" />
     </application>
 
 </manifest>

res/layout/activity_manage_space.xml

@@ -4,4 +4,26 @@
               android:layout_width="match_parent"
               android:layout_height="match_parent">
 
+    <TextView
+        android:id="@+id/general_description"
+        android:layout_height="wrap_content"
+        android:layout_width="match_parent"
+        android:layout_gravity="center_vertical"
+        android:singleLine="false"
+        android:layout_margin="10dp"
+        style="?android:attr/editTextPreferenceStyle"
+        android:text="@string/manage_space_description"
+        />
+
+    <android.support.v7.widget.AppCompatButton
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:text="@string/manage_space_clear_data"
+        android:id="@+id/clearDataButton"
+        android:layout_gravity="center_horizontal"
+        android:layout_margin="4dp"
+        android:theme="@style/Button.Primary"
+        style="@style/Button.Primary"
+        android:contentDescription="@string/manage_space_clear_data"/>
+
 </LinearLayout>

res/values/strings.xml

@@ -405,5 +405,8 @@
     <string name="action_switch_grid_view">Grid view</string>
     <string name="action_switch_list_view">List view</string>
 
-    <string name="manage_space">Manage space</string>
+    <string name="manage_space_title">Manage space</string>
+    <string name="manage_space_description"> All %1$s\'s data will be deleted permanentlty. \nThis includes all files, settings, accounts, databases, etc. \n\nThis process can take some minutes.</string>
+    <string name="manage_space_clear_data">Clear data</string>
+    <string name="manage_string_message">%1$s\'s data deleted</string>
 </resources>

src/com/owncloud/android/ui/activity/ManageSpaceActivity.java

@@ -1,17 +1,128 @@
 package com.owncloud.android.ui.activity;
 
+import android.content.Intent;
+import android.content.SharedPreferences;
 import android.os.Bundle;
+import android.preference.PreferenceManager;
+import android.support.v7.app.ActionBar;
 import android.support.v7.app.AppCompatActivity;
+import android.view.MenuItem;
+import android.view.View;
+import android.widget.Button;
+import android.widget.TextView;
+import android.widget.Toast;
 
 import com.owncloud.android.R;
+import com.owncloud.android.lib.common.utils.Log_OC;
+
+import java.io.File;
 
 public class ManageSpaceActivity extends AppCompatActivity {
 
+    private static final String TAG = ManageSpaceActivity.class.getSimpleName();
+
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_manage_space);
+
+        ActionBar actionBar = getSupportActionBar();
+        actionBar.setDisplayHomeAsUpEnabled(true);
+        actionBar.setTitle(R.string.manage_space_title);
+
+        TextView descriptionTextView = (TextView) findViewById(R.id.general_description);
+        descriptionTextView.setText(getString(R.string.manage_space_description, getString(R.string.app_name)));
+
+        Button clearDataButton = (Button) findViewById(R.id.clearDataButton);
+        clearDataButton.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                clearData();
+            }
+        });
     }
 
+    /**
+     * Save passcode from Share preferences
+     * Clear the rest of data
+     */
+    private void clearData() {
+        // Save passcode from Share preferences
+        SharedPreferences appPrefs = PreferenceManager
+                .getDefaultSharedPreferences(getApplicationContext());
+
+        boolean passCodeEnable = appPrefs.getBoolean("set_pincode", false);
+
+        String passCodeDigits[] = new String[4];
+        if (passCodeEnable) {
+            passCodeDigits[0] = appPrefs.getString("PrefPinCode1", null);
+            passCodeDigits[1] = appPrefs.getString("PrefPinCode2", null);
+            passCodeDigits[2] = appPrefs.getString("PrefPinCode3", null);
+            passCodeDigits[3] = appPrefs.getString("PrefPinCode4", null);
+        }
+
+        // Clear data
+        clearApplicationData();
+
+        // Recover passcode
+        SharedPreferences.Editor appPrefsEditor = PreferenceManager
+                .getDefaultSharedPreferences(getApplicationContext()).edit();
+        if (passCodeEnable) {
+            appPrefsEditor.putString("PrefPinCode1", passCodeDigits[0]);
+            appPrefsEditor.putString("PrefPinCode2", passCodeDigits[1]);
+            appPrefsEditor.putString("PrefPinCode3", passCodeDigits[2]);
+            appPrefsEditor.putString("PrefPinCode4", passCodeDigits[3]);
+        }
+
+        appPrefsEditor.putBoolean("set_pincode", passCodeEnable);
+        appPrefsEditor.commit();
+
+        String message = getString(R.string.manage_string_message, getString(R.string.app_name));
+        Toast.makeText(this, message, Toast.LENGTH_LONG).show();
 
+    }
+
+    public void clearApplicationData() {
+        File cache = getCacheDir();
+        File appDir = new File(cache.getParent());
+        if (appDir.exists()) {
+            String[] children = appDir.list();
+            for (String s : children) {
+                if (!s.equals("lib")) {
+                    deleteDir(new File(appDir, s));
+                    Log_OC.i(TAG, "*******File /data/data/" + getString(R.string.app_name)+
+                            "/" + s + " DELETED *******");
+                }
+            }
+        }
+    }
+
+    public static boolean deleteDir(File dir) {
+        if (dir != null && dir.isDirectory()) {
+            String[] children = dir.list();
+            for (int i = 0; i < children.length; i++) {
+                boolean success = deleteDir(new File(dir, children[i]));
+                if (!success) {
+                    return false;
+                }
+            }
+        }
+
+        return dir.delete();
+    }
+
+
+    @Override
+    public boolean onOptionsItemSelected(MenuItem item) {
+        super.onOptionsItemSelected(item);
+        switch (item.getItemId()) {
+            case android.R.id.home:
+                finish();
+                break;
+            default:
+                Log_OC.w(TAG, "Unknown menu item triggered");
+                return false;
+        }
+        return true;
+    }
 }