Java tutorial
/** * * Licensed to the Apache Software Foundation (ASF) under one * or more contributor license agreements. See the NOTICE file * distributed with this work for additional information * regarding copyright ownership. The ASF licenses this file * to you 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. See the License for the * specific language governing permissions and limitations * under the License. * */ package com.doylestowncoder.plugin.mobileaccessibility; import org.apache.cordova.CallbackContext; import org.apache.cordova.CordovaInterface; import org.apache.cordova.CordovaPlugin; import org.apache.cordova.CordovaWebView; import org.apache.cordova.PluginResult; import org.json.JSONArray; import org.json.JSONException; import org.json.JSONObject; import android.os.Build; import android.webkit.WebView; /** * This class provides information on the status of native accessibility services to JavaScript. */ public class MobileAccessibility extends CordovaPlugin { protected AbstractMobileAccessibilityHelper mMobileAccessibilityHelper; protected CallbackContext mCallbackContext = null; protected boolean mIsScreenReaderRunning = false; protected boolean mClosedCaptioningEnabled = false; protected boolean mTouchExplorationEnabled = false; protected boolean mCachedIsScreenReaderRunning = false; protected float mFontScale = 1; @Override public void initialize(CordovaInterface cordova, CordovaWebView webView) { super.initialize(cordova, webView); if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) { mMobileAccessibilityHelper = new KitKatMobileAccessibilityHelper(); } else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) { mMobileAccessibilityHelper = new JellyBeanMobileAccessibilityHelper(); } else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.ICE_CREAM_SANDWICH) { mMobileAccessibilityHelper = new IceCreamSandwichMobileAccessibilityHelper(); } else { mMobileAccessibilityHelper = new DonutMobileAccessibilityHelper(); } mMobileAccessibilityHelper.initialize(this); } @Override public boolean execute(String action, JSONArray args, CallbackContext callbackContext) throws JSONException { try { if (action.equals("isScreenReaderRunning")) { isScreenReaderRunning(callbackContext); return true; } else if (action.equals("isClosedCaptioningEnabled")) { isClosedCaptioningEnabled(callbackContext); return true; } else if (action.equals("isTouchExplorationEnabled")) { isTouchExplorationEnabled(callbackContext); return true; } else if (action.equals("postNotification")) { if (args.length() > 1) { String string = args.getString(1); if (!string.isEmpty()) { announceForAccessibility(string, callbackContext); } } return true; } else if (action.equals("getTextZoom")) { getTextZoom(callbackContext); return true; } else if (action.equals("setTextZoom")) { if (args.length() > 0) { double textZoom = args.getDouble(0); if (textZoom > 0) { setTextZoom(textZoom, callbackContext); } } return true; } else if (action.equals("updateTextZoom")) { updateTextZoom(callbackContext); return true; } else if (action.equals("start")) { start(callbackContext); return true; } else if (action.equals("stop")) { stop(); return true; } } catch (JSONException e) { e.printStackTrace(); callbackContext.sendPluginResult(new PluginResult(PluginResult.Status.JSON_EXCEPTION)); } return false; } /** * Called when the system is about to pause the current activity * * @param multitasking Flag indicating if multitasking is turned on for app */ @Override public void onPause(boolean multitasking) { //Log.i("MobileAccessibility", "onPause"); mCachedIsScreenReaderRunning = mIsScreenReaderRunning; } /** * Called when the activity will start interacting with the user. * * @param multitasking Flag indicating if multitasking is turned on for app */ @Override public void onResume(boolean multitasking) { //Log.i("MobileAccessibility", "onResume"); if (mIsScreenReaderRunning && !mCachedIsScreenReaderRunning) { //Log.i("MobileAccessibility", "Reloading page on reload because the Accessibility State has changed."); mCachedIsScreenReaderRunning = mIsScreenReaderRunning; stop(); cordova.getActivity().runOnUiThread(new Runnable() { public void run() { WebView view; try { view = (WebView) webView; } catch (ClassCastException ce) { // cordova-android 4.0+ view = (WebView) webView.getView(); } view.reload(); } }); } } /** * The final call you receive before your activity is destroyed. */ public void onDestroy() { stop(); } protected boolean isScreenReaderRunning(final CallbackContext callbackContext) { mIsScreenReaderRunning = mMobileAccessibilityHelper.isScreenReaderRunning(); cordova.getThreadPool().execute(new Runnable() { public void run() { callbackContext.success(mIsScreenReaderRunning ? 1 : 0); } }); return mIsScreenReaderRunning; } protected boolean isScreenReaderRunning() { mIsScreenReaderRunning = mMobileAccessibilityHelper.isScreenReaderRunning(); return mIsScreenReaderRunning; } protected boolean isClosedCaptioningEnabled(final CallbackContext callbackContext) { mClosedCaptioningEnabled = mMobileAccessibilityHelper.isClosedCaptioningEnabled(); cordova.getThreadPool().execute(new Runnable() { public void run() { callbackContext.success(mClosedCaptioningEnabled ? 1 : 0); } }); return mClosedCaptioningEnabled; } protected boolean isClosedCaptioningEnabled() { mClosedCaptioningEnabled = mMobileAccessibilityHelper.isClosedCaptioningEnabled(); return mClosedCaptioningEnabled; } protected boolean isTouchExplorationEnabled(final CallbackContext callbackContext) { mTouchExplorationEnabled = mMobileAccessibilityHelper.isTouchExplorationEnabled(); cordova.getThreadPool().execute(new Runnable() { public void run() { callbackContext.success(mTouchExplorationEnabled ? 1 : 0); } }); return mTouchExplorationEnabled; } protected boolean isTouchExplorationEnabled() { mTouchExplorationEnabled = mMobileAccessibilityHelper.isTouchExplorationEnabled(); return mTouchExplorationEnabled; } protected void announceForAccessibility(CharSequence text, final CallbackContext callbackContext) { mMobileAccessibilityHelper.announceForAccessibility(text); if (callbackContext != null) { JSONObject info = new JSONObject(); try { info.put("stringValue", text); info.put("wasSuccessful", mIsScreenReaderRunning); } catch (JSONException e) { e.printStackTrace(); } callbackContext.success(info); } } public void onAccessibilityStateChanged(boolean enabled) { mIsScreenReaderRunning = enabled; cordova.getActivity().runOnUiThread(new Runnable() { public void run() { sendMobileAccessibilityStatusChangedCallback(); } }); } public void onCaptioningEnabledChanged(boolean enabled) { mClosedCaptioningEnabled = enabled; cordova.getActivity().runOnUiThread(new Runnable() { public void run() { sendMobileAccessibilityStatusChangedCallback(); } }); } public void onTouchExplorationStateChanged(boolean enabled) { mTouchExplorationEnabled = enabled; cordova.getActivity().runOnUiThread(new Runnable() { public void run() { sendMobileAccessibilityStatusChangedCallback(); } }); } public void getTextZoom(final CallbackContext callbackContext) { cordova.getActivity().runOnUiThread(new Runnable() { public void run() { final double textZoom = mMobileAccessibilityHelper.getTextZoom(); if (callbackContext != null) { callbackContext.success((int) textZoom); } } }); } public void setTextZoom(final double textZoom, final CallbackContext callbackContext) { cordova.getActivity().runOnUiThread(new Runnable() { public void run() { mMobileAccessibilityHelper.setTextZoom(textZoom); if (callbackContext != null) { callbackContext.success((int) mMobileAccessibilityHelper.getTextZoom()); } ; } }); } public void setTextZoom(final double textZoom) { cordova.getActivity().runOnUiThread(new Runnable() { public void run() { mMobileAccessibilityHelper.setTextZoom(textZoom); } }); } public void updateTextZoom(final CallbackContext callbackContext) { float fontScale = cordova.getActivity().getResources().getConfiguration().fontScale; if (fontScale != mFontScale) { mFontScale = fontScale; } final double textZoom = Math.round(mFontScale * 100); setTextZoom(textZoom, callbackContext); } protected void sendMobileAccessibilityStatusChangedCallback() { if (this.mCallbackContext != null) { PluginResult result = new PluginResult(PluginResult.Status.OK, getMobileAccessibilityStatus()); result.setKeepCallback(true); this.mCallbackContext.sendPluginResult(result); } } /* Get the current mobile accessibility status. */ protected JSONObject getMobileAccessibilityStatus() { JSONObject status = new JSONObject(); try { status.put("isScreenReaderRunning", mIsScreenReaderRunning); status.put("isClosedCaptioningEnabled", mClosedCaptioningEnabled); status.put("isTouchExplorationEnabled", mTouchExplorationEnabled); //Log.i("MobileAccessibility", "MobileAccessibility.isScreenReaderRunning == " + status.getString("isScreenReaderRunning") + // "\nMobileAccessibility.isClosedCaptioningEnabled == " + status.getString("isClosedCaptioningEnabled") + // "\nMobileAccessibility.isTouchExplorationEnabled == " + status.getString("isTouchExplorationEnabled") ); } catch (JSONException e) { e.printStackTrace(); } return status; } protected void start(CallbackContext callbackContext) { //Log.i("MobileAccessibility", "MobileAccessibility.start"); mCallbackContext = callbackContext; mMobileAccessibilityHelper.addStateChangeListeners(); sendMobileAccessibilityStatusChangedCallback(); } protected void stop() { //Log.i("MobileAccessibility", "MobileAccessibility.stop"); if (mCallbackContext != null) { sendMobileAccessibilityStatusChangedCallback(); mMobileAccessibilityHelper.removeStateChangeListeners(); mCallbackContext = null; } } }