Import/export keys as JSON

Author: adgad

app/src/main/AndroidManifest.xml

@@ -4,6 +4,7 @@
 
     <uses-permission android:name="android.permission.VIBRATE" />
     <uses-permission android:name="android.permission.INTERNET" />
+    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
 
     <application
         android:allowBackup="true"

app/src/main/java/com/adgad/kboard/PrefsActivity.java

@@ -15,14 +15,28 @@
 import android.view.MenuItem;
 import android.widget.Toast;
 
+import com.google.gson.Gson;
+
+import java.io.FileNotFoundException;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.io.OutputStream;
+import java.io.Reader;
+import java.io.UnsupportedEncodingException;
+import java.util.ArrayList;
+
 /**
  * Created by arjun on 14/03/15.
  */
+
+
 public class PrefsActivity extends PreferenceActivity {
     /**
      * Adds intent extras so fragment opens
      */
 
+
     @Override
     protected boolean isValidFragment (String fragmentName) {
         return SettingsFragment.class.getName().equals("com.adgad.kboard.PrefsActivity$SettingsFragment");
@@ -72,16 +86,129 @@ public boolean onCreateOptionsMenu(Menu menu) {
     public static class SettingsFragment extends PreferenceFragment
         implements SharedPreferences.OnSharedPreferenceChangeListener {
 
+        private final Gson gson = new Gson();
+        SharedPreferences prefs = null;
+        private final int EXPORT_REQUEST_CODE = 1;
+        private final int IMPORT_REQUEST_CODE = 2;
+
+
 
         @Override
         public void onCreate(Bundle savedInstanceState) {
             super.onCreate(savedInstanceState);
-
-
+            prefs = PreferenceManager.getDefaultSharedPreferences(this.getActivity());
             // Load the preferences from an XML resource
             addPreferencesFromResource(R.xml.prefs);
             initSummary(getPreferenceScreen());
 
+            Preference importKeys = (Preference) findPreference("importKeys");
+
+            importKeys.setOnPreferenceClickListener(new Preference.OnPreferenceClickListener() {
+                @Override
+                public boolean onPreferenceClick(Preference preference) {
+                    Intent intent = new Intent(Intent.ACTION_OPEN_DOCUMENT);
+                    intent.addCategory(Intent.CATEGORY_OPENABLE);
+                    intent.setType("application/json");
+                    startActivityForResult(intent, IMPORT_REQUEST_CODE);
+                    return true;
+                }
+            });
+
+            Preference exportKeys = (Preference) findPreference("exportKeys");
+
+            exportKeys.setOnPreferenceClickListener(new Preference.OnPreferenceClickListener() {
+                @Override
+                public boolean onPreferenceClick(Preference preference) {
+                    Intent intent = new Intent(Intent.ACTION_CREATE_DOCUMENT);
+                    intent.addCategory(Intent.CATEGORY_OPENABLE);
+                    intent.setType("application/json");
+                    intent.putExtra(Intent.EXTRA_TITLE, "kboard-keys.json");
+                    startActivityForResult(intent, EXPORT_REQUEST_CODE);
+                    return true;
+                }
+
+            });
+
+
+
+
+        }
+
+        public String isToString(InputStream inputStream) {
+            final int bufferSize = 1024;
+            final char[] buffer = new char[bufferSize];
+            final StringBuilder out = new StringBuilder();
+            Reader in = null;
+            try {
+                in = new InputStreamReader(inputStream, "UTF-8");
+            } catch (UnsupportedEncodingException e) {
+                e.printStackTrace();
+            }
+            for (; ; ) {
+                int rsz = 0;
+                try {
+                    rsz = in.read(buffer, 0, buffer.length);
+                } catch (IOException e) {
+                    e.printStackTrace();
+                }
+                if (rsz < 0)
+                    break;
+                out.append(buffer, 0, rsz);
+            }
+            return out.toString();
+        }
+
+        @Override
+        public void onActivityResult(int requestCode, int resultCode, Intent data) {
+            super.onActivityResult(requestCode, resultCode, data);
+            OutputStream outputStream = null;
+            InputStream inputStream = null;
+            if (requestCode == EXPORT_REQUEST_CODE) {
+
+                String currentVals = prefs.getString(KboardIME.Keys.STORAGE_KEY, "");
+
+                // Note: you may use try-with resources if your API is 19+
+                try {
+                    // InputStream constructor takes File, String (path), or FileDescriptor
+                    // data.getData() holds the URI of the path selected by the picker
+                    Uri uri = data.getData();
+                    outputStream = this.getActivity().getContentResolver().openOutputStream(uri);
+                    outputStream.write(currentVals.getBytes());
+                    outputStream.close();
+                    Toast.makeText(this.getActivity(), "Exported keys to " + uri.getPath(), Toast.LENGTH_LONG).show();
+                } catch (FileNotFoundException e) {
+                    e.printStackTrace();
+                } catch (IOException e) {
+                    e.printStackTrace();
+                } finally {
+                    try {
+                        outputStream.close();
+                    } catch (IOException e) {
+                        e.printStackTrace();
+                    }
+                }
+            } else if (requestCode == IMPORT_REQUEST_CODE) {
+                try {
+                    inputStream =  this.getActivity().getContentResolver().openInputStream(data.getData());
+                    String keys = isToString(inputStream);
+                    ArrayList<String> keysAsJson = gson.fromJson(keys, ArrayList.class);
+                    SharedPreferences.Editor editor = prefs.edit();
+                    editor.putString(KboardIME.Keys.STORAGE_KEY, keys);
+                    editor.apply();
+                    Toast toast = Toast.makeText(this.getActivity(), "Imported " + keysAsJson.size() + " keys!", Toast.LENGTH_SHORT);
+                    toast.show();
+                } catch (FileNotFoundException e) {
+                    e.printStackTrace();
+                } catch (IOException e) {
+                    e.printStackTrace();
+                } finally {
+                    try {
+                        inputStream.close();
+                    } catch (IOException e) {
+                        e.printStackTrace();
+                    }
+                }
+            }
         }
 
         @Override

app/src/main/res/xml/prefs.xml

@@ -11,6 +11,8 @@
     <Preference android:title="Custom Keys" >
         <intent android:action="com.adgad.kboard.CustomKeysActivity"/>
     </Preference>
+    <Preference android:title="Import Keys"  android:key="importKeys"/>
+    <Preference android:title="Export Keys"  android:key="exportKeys"/>
 
     <PreferenceCategory
         android:title="Options">