Java tutorial
/* * PhoneGap is available under *either* the terms of the modified BSD license *or* the * MIT License (2008). See http://opensource.org/licenses/alphabetical for full text. * * Copyright (c) 2005-2011, Nitobi Software Inc. * Copyright (c) 2010-2011, IBM Corporation * Copyright (c) 2013, Takhfifan. */ package com.phonegap.plugins.childbrowser; import java.io.IOException; import java.io.InputStream; import org.json.JSONArray; import org.json.JSONException; import org.json.JSONObject; import android.R.bool; import android.app.Dialog; import android.content.Context; import android.content.DialogInterface; import android.content.Intent; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.net.Uri; import android.util.Log; import android.view.KeyEvent; import android.view.View; import android.view.Window; import android.view.WindowManager; import android.view.WindowManager.LayoutParams; import android.view.inputmethod.InputMethodManager; import android.webkit.WebView; import android.webkit.WebViewClient; import android.widget.EditText; import android.widget.ImageButton; import android.widget.LinearLayout; import org.apache.cordova.CordovaPlugin; import org.apache.cordova.CordovaInterface; import org.apache.cordova.PluginResult; import org.apache.cordova.CallbackContext; public class ChildBrowser extends CordovaPlugin { protected static final String LOG_TAG = "ChildBrowser"; private static int CLOSE_EVENT = 0; private static int LOCATION_CHANGED_EVENT = 1; private static int OPEN_EXTERNAL_EVENT = 2; private static int BROWSER_OPENED = 3; private CallbackContext callbackContext = null; private Dialog dialog; private WebView webview; private EditText edittext; private boolean showLocationBar = true; private boolean showAddress = true; private boolean showNavigationBar = true; /** * Executes the request and returns boolean. * * @param action The action to execute. * @param args JSONArry of arguments for the plugin. * @param callbackContext The callback context used when calling back into JavaScript. * @return boolean */ @Override public boolean execute(String action, JSONArray args, final CallbackContext callbackContext) throws JSONException { Log.d(LOG_TAG, action); String result = ""; if (action.equals("showWebPage")) { Log.d(LOG_TAG, args.getString(0)); Log.d(LOG_TAG, action); // If the ChildBrowser is already open then throw an error if (dialog != null && dialog.isShowing()) { callbackContext.error("ChildBrowser is already open"); } else { this.callbackContext = callbackContext; result = this.showWebPage(args.getString(0), args.optJSONObject(1)); if (result.length() > 0) { callbackContext.error(result); } else { JSONObject obj = new JSONObject(); obj.put("type", BROWSER_OPENED); sendUpdate(obj, true); } Log.d(LOG_TAG, result); } return true; } else if (action.equals("close")) { closeDialog(); JSONObject obj = new JSONObject(); obj.put("type", CLOSE_EVENT); sendUpdate(obj, false); return true; } else if (action.equals("openExternal")) { result = this.openExternal(args.getString(0), args.optBoolean(1)); if (result.length() > 0) { callbackContext.error(result); } else { JSONObject obj = new JSONObject(); obj.put("type", OPEN_EXTERNAL_EVENT); sendUpdate(obj, true); } return true; } return false; } /** * Display a new browser with the specified URL. * * @param url The url to load. * @param usePhoneGap Load url in PhoneGap webview * @return "" if ok, or error message. */ public String openExternal(String url, boolean usePhoneGap) { try { Intent intent = null; if (usePhoneGap) { intent = new Intent().setClass((Context) cordova.getActivity(), org.apache.cordova.DroidGap.class); intent.setData(Uri.parse(url)); // This line will be removed in future. intent.putExtra("url", url); // Timeout parameter: 60 sec max - May be less if http device timeout is less. intent.putExtra("loadUrlTimeoutValue", 60000); // These parameters can be configured if you want to show the loading dialog intent.putExtra("loadingDialog", "Wait,Loading web page..."); intent.putExtra("hideLoadingDialogOnPageLoad", true); } else { intent = new Intent(Intent.ACTION_VIEW); intent.setData(Uri.parse(url)); } cordova.getActivity().startActivity(intent); return ""; } catch (android.content.ActivityNotFoundException e) { Log.d(LOG_TAG, "ChildBrowser: Error loading url " + url + ":" + e.toString()); return e.toString(); } } /** * Closes the dialog */ private void closeDialog() { if (dialog != null) { dialog.dismiss(); } } /** * Sees if it is possible to go back one page in history, then does so */ private void goBack() { if (this.webview.canGoBack()) { this.webview.goBack(); } } /** * Sees if it is possible to go forward one page in history, then does so */ private void goForward() { if (this.webview.canGoForward()) { this.webview.goForward(); } } /** * Navigate to the new page * * @param url to load */ private void navigate(String url) { InputMethodManager imm = (InputMethodManager) cordova.getActivity() .getSystemService(Context.INPUT_METHOD_SERVICE); imm.hideSoftInputFromWindow(edittext.getWindowToken(), 0); if (!url.startsWith("http")) { this.webview.loadUrl("http://" + url); } this.webview.loadUrl(url); this.webview.requestFocus(); } /** * Should we show the location bar? * * @return boolean */ private boolean getShowLocationBar() { return this.showLocationBar; } /** * Display a new browser with the specified URL. * * @param url The url to load. * @param jsonObject */ public String showWebPage(final String url, JSONObject options) { // Determine if we should hide the location bar. if (options != null) { showLocationBar = options.optBoolean("showLocationBar", true); showNavigationBar = options.optBoolean("showNavigationBar", true); showAddress = options.optBoolean("showAddress", true); } // Create dialog in new thread Runnable runnable = new Runnable() { public void run() { dialog = new Dialog((Context) cordova.getActivity()); dialog.requestWindowFeature(Window.FEATURE_NO_TITLE); dialog.setCancelable(true); dialog.setOnDismissListener(new DialogInterface.OnDismissListener() { public void onDismiss(DialogInterface dialog) { webview.stopLoading(); try { JSONObject obj = new JSONObject(); obj.put("type", CLOSE_EVENT); sendUpdate(obj, false); } catch (JSONException e) { Log.d(LOG_TAG, "Should never happen"); } } }); LinearLayout.LayoutParams backParams = new LinearLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT); LinearLayout.LayoutParams forwardParams = new LinearLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT); LinearLayout.LayoutParams editParams = new LinearLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT, 1.0f); LinearLayout.LayoutParams closeParams = new LinearLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT); LinearLayout.LayoutParams wvParams = new LinearLayout.LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT); if (!showAddress) // larger buttons if address bar is not visible { backParams = new LinearLayout.LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT, 1.0f); forwardParams = new LinearLayout.LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT, 1.0f); closeParams = new LinearLayout.LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT, 1.0f); } LinearLayout main = new LinearLayout((Context) cordova.getActivity()); main.setOrientation(LinearLayout.VERTICAL); LinearLayout toolbar = new LinearLayout((Context) cordova.getActivity()); toolbar.setOrientation(LinearLayout.HORIZONTAL); ImageButton back = new ImageButton((Context) cordova.getActivity()); back.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { goBack(); } }); back.setId(1); try { back.setImageBitmap(loadDrawable("www/childbrowser/icon_arrow_left.png")); } catch (IOException e) { Log.e(LOG_TAG, e.getMessage(), e); } back.setLayoutParams(backParams); ImageButton forward = new ImageButton((Context) cordova.getActivity()); forward.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { goForward(); } }); forward.setId(2); try { forward.setImageBitmap(loadDrawable("www/childbrowser/icon_arrow_right.png")); } catch (IOException e) { Log.e(LOG_TAG, e.getMessage(), e); } forward.setLayoutParams(forwardParams); edittext = new EditText((Context) cordova.getActivity()); edittext.setOnKeyListener(new View.OnKeyListener() { public boolean onKey(View v, int keyCode, KeyEvent event) { // If the event is a key-down event on the "enter" button if ((event.getAction() == KeyEvent.ACTION_DOWN) && (keyCode == KeyEvent.KEYCODE_ENTER)) { navigate(edittext.getText().toString()); return true; } return false; } }); edittext.setId(3); edittext.setSingleLine(true); edittext.setText(url); edittext.setLayoutParams(editParams); ImageButton close = new ImageButton(cordova.getActivity()); close.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { closeDialog(); } }); close.setId(4); try { close.setImageBitmap(loadDrawable("www/childbrowser/icon_close.png")); } catch (IOException e) { Log.e(LOG_TAG, e.getMessage(), e); } close.setLayoutParams(closeParams); webview = new WebView((Context) cordova.getActivity()); webview.getSettings().setJavaScriptEnabled(true); webview.getSettings().setBuiltInZoomControls(true); WebViewClient client = new ChildBrowserClient(cordova, edittext); webview.setWebViewClient(client); webview.loadUrl(url); webview.setId(5); webview.setInitialScale(0); webview.setLayoutParams(wvParams); webview.requestFocus(); webview.requestFocusFromTouch(); webview.getSettings().setUseWideViewPort(true); webview.getSettings().setLoadWithOverviewMode(true); toolbar.addView(back); toolbar.addView(forward); toolbar.addView(edittext); toolbar.addView(close); if (getShowLocationBar()) { main.addView(toolbar); } main.addView(webview); WindowManager.LayoutParams lp = new WindowManager.LayoutParams(); lp.copyFrom(dialog.getWindow().getAttributes()); lp.width = WindowManager.LayoutParams.FILL_PARENT; lp.height = WindowManager.LayoutParams.FILL_PARENT; dialog.setContentView(main); dialog.show(); dialog.getWindow().setAttributes(lp); if (!showNavigationBar) { back.setVisibility(View.GONE); forward.setVisibility(View.GONE); close.setVisibility(View.GONE); } if (!showAddress) { edittext.setVisibility(View.GONE); } } private Bitmap loadDrawable(String filename) throws java.io.IOException { InputStream input = cordova.getActivity().getAssets().open(filename); return BitmapFactory.decodeStream(input); } }; cordova.getActivity().runOnUiThread(runnable); return ""; } /** * Create a new plugin result and send it back to JavaScript * * @param obj a JSONObject contain event payload information */ private void sendUpdate(JSONObject obj, boolean keepCallback) { if (this.callbackContext != null) { PluginResult pr = new PluginResult(PluginResult.Status.OK, obj); pr.setKeepCallback(keepCallback); callbackContext.sendPluginResult(pr); Log.d("ChildBrowser", "sent plugin result via callbackContext"); } else { Log.d("ChildBrowser", "callbackContext is null :|"); } } /** * The webview client receives notifications about appView */ public class ChildBrowserClient extends WebViewClient { CordovaInterface ctx; EditText edittext; /** * Constructor. * * @param mContext * @param edittext */ public ChildBrowserClient(CordovaInterface mContext, EditText mEditText) { this.ctx = mContext; this.edittext = mEditText; } /** * Notify the host application that a page has started loading. * * @param view The webview initiating the callback. * @param url The url of the page. */ @Override public void onPageStarted(WebView view, String url, Bitmap favicon) { super.onPageStarted(view, url, favicon); String newloc; if (url.startsWith("http:") || url.startsWith("https:")) { newloc = url; } else { newloc = "http://" + url; } if (!newloc.equals(edittext.getText().toString())) { edittext.setText(newloc); } try { JSONObject obj = new JSONObject(); obj.put("type", LOCATION_CHANGED_EVENT); obj.put("location", url); sendUpdate(obj, true); } catch (JSONException e) { Log.d("ChildBrowser", "This should never happen"); } } } }