add a preference option to select an external directory

app/build.gradle

@@ -33,6 +33,7 @@ dependencies {
     compile 'org.apache.commons:commons-io:1.3.2'
     compile 'com.jayway.android.robotium:robotium-solo:5.3.1'
     compile 'com.melnykov:floatingactionbutton:1.2.0'
+    compile 'net.rdrei.android.dirchooser:library:2.1@aar'
     compile group: 'com.google.guava', name: 'guava', version: '18.0'
 }
 tasks.findAll {    // make all tasks whose name starts with 'assemble'...

app/src/main/AndroidManifest.xml

@@ -30,9 +30,12 @@
 			<meta-data android:name="android.support.PARENT_ACTIVITY"
 				android:value="com.zeapo.pwdstore.PasswordStore" />
 		</activity>
+
+        <activity android:name="net.rdrei.android.dirchooser.DirectoryChooserActivity" />
 	</application>
 
 	<uses-permission android:name="android.permission.INTERNET" />
     <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
+    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
 
 </manifest>

app/src/main/java/com/zeapo/pwdstore/UserPreference.java

@@ -5,6 +5,7 @@ import android.content.Intent;
 import android.content.SharedPreferences;
 import android.net.Uri;
 import android.os.Bundle;
+import android.os.Environment;
 import android.preference.Preference;
 import android.preference.PreferenceFragment;
 import android.preference.PreferenceManager;
@@ -19,6 +20,8 @@ import com.zeapo.pwdstore.crypto.PgpHandler;
 import com.zeapo.pwdstore.git.GitActivity;
 import com.zeapo.pwdstore.utils.PasswordRepository;
 
+import net.rdrei.android.dirchooser.DirectoryChooserActivity;
+
 import org.apache.commons.io.FileUtils;
 import org.apache.commons.io.IOUtils;
 import org.openintents.openpgp.util.OpenPgpKeyPreference;
@@ -34,6 +37,7 @@ public class UserPreference extends AppCompatActivity {
     private final static int IMPORT_PGP_KEY = 2;
     private final static int EDIT_GIT_INFO = 3;
     private OpenPgpKeyPreference mKey;
+    private final static int SELECT_GIT_DIRECTORY = 4;
 
     public static class PrefsFragment extends PreferenceFragment {
         @Override
@@ -108,6 +112,22 @@ public class UserPreference extends AppCompatActivity {
                 callingActivity.mKey.setOpenPgpProvider((String) o);
                 return false;
             });
+
+            findPreference("pref_select_external").setOnPreferenceClickListener((Preference pref) -> {
+                Uri selectedUri = Uri.parse(Environment.getExternalStorageDirectory().getAbsolutePath());
+                Intent intent = new Intent(Intent.ACTION_VIEW);
+                intent.setData(selectedUri);
+
+                if (intent.resolveActivity(callingActivity.getPackageManager()) != null) {
+                    startActivityForResult(Intent.createChooser(intent, "Open folder"), SELECT_GIT_DIRECTORY);
+                } else {
+                    intent = new Intent(callingActivity, DirectoryChooserActivity.class);
+                    intent.putExtra(DirectoryChooserActivity.EXTRA_NEW_DIR_NAME,  "DirChooserSample");
+
+                    startActivityForResult(intent, SELECT_GIT_DIRECTORY);
+                }
+                return true;
+            });
         }
     }
 
@@ -150,7 +170,6 @@ public class UserPreference extends AppCompatActivity {
         startActivityForResult(intent, IMPORT_SSH_KEY);
     }
 
-
     private void copySshKey(Uri uri) throws IOException {
         InputStream sshKey = this.getContentResolver().openInputStream(uri);
         byte[] privateKey = IOUtils.toByteArray(sshKey);

app/src/main/res/color/text_color.xml

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<selector xmlns:android="http://schemas.android.com/apk/res/android" >
+    <item android:state_enabled="false" android:color="@color/grey_500"/>
+    <item android:color="@color/blue_grey_900"/>
+</selector>

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

@@ -6,7 +6,7 @@
         <item name="colorPrimaryDark">@color/blue_grey_500</item>
         <item name="android:windowBackground">@color/blue_grey_50</item>
         <item name="android:textColorPrimary">@color/teal_900</item>
-        <item name="android:textColor">@color/blue_grey_900</item>
+        <item name="android:textColor">@color/text_color</item>
         <item name="actionModeStyle">@style/ActionMode</item>
     </style>
 

app/src/main/res/xml/preference.xml

@@ -3,7 +3,12 @@
 	<PreferenceCategory android:title="@string/pref_git_title">
 		<Preference android:title="@string/pref_edit_server_info" android:key="git_server_info"/>
 		<Preference android:title="@string/pref_ssh_title" android:key="ssh_key" />
-        <Preference android:title="@string/pref_git_delete_repo" android:key="git_delete_repo"/>
+        <Preference android:title="@string/pref_git_delete_repo" android:key="git_delete_repo"
+            android:summary="Deletes local repository"/>
+        <CheckBoxPreference android:title="External repository" android:key="git_external"
+            android:summary="Use an external password repository"/>
+        <Preference android:title="Select external repository" android:key="pref_select_external"
+            android:dependency="git_external"/>
 	</PreferenceCategory>
 
 	<PreferenceCategory android:title="@string/pref_crypto_title">