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 */ package com.phonegap.plugins.childBrowser; import java.io.IOException; import java.io.InputStream; import org.apache.cordova.api.CordovaInterface; import org.json.JSONArray; import org.json.JSONException; import org.json.JSONObject; 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; // dda import android.webkit.WebChromeClient; import android.webkit.ConsoleMessage; import com.phonegap.api.PhonegapActivity; import com.phonegap.api.Plugin; import com.phonegap.api.PluginResult; public class ChildBrowser extends Plugin { protected static final String LOG_TAG = "ChildBrowser"; private static int CLOSE_EVENT = 0; private static int LOCATION_CHANGED_EVENT = 1; private static int PAGE_LOADED = 2; private String browserCallbackId = null; private Dialog dialog; private WebView webview; private EditText edittext; private boolean showLocationBar = true; /** * Executes the request and returns PluginResult. * * @param action The action to execute. * @param args JSONArry of arguments for the plugin. * @param callbackId The callback id used when calling back into JavaScript. * @return A PluginResult object with a status and message. */ public PluginResult execute(String action, JSONArray args, String callbackId) { PluginResult.Status status = PluginResult.Status.OK; String result = ""; try { if (action.equals("showWebPage")) { this.browserCallbackId = callbackId; // If the ChildBrowser is already open then throw an error if (dialog != null && dialog.isShowing()) { return new PluginResult(PluginResult.Status.ERROR, "ChildBrowser is already open"); } result = this.showWebPage(args.getString(0), args.optJSONObject(1)); if (result.length() > 0) { status = PluginResult.Status.ERROR; return new PluginResult(status, result); } else { PluginResult pluginResult = new PluginResult(status, result); pluginResult.setKeepCallback(true); return pluginResult; } } else if (action.equals("close")) { closeDialog(); JSONObject obj = new JSONObject(); obj.put("type", CLOSE_EVENT); PluginResult pluginResult = new PluginResult(status, obj); pluginResult.setKeepCallback(false); return pluginResult; } else if (action.equals("openExternal")) { result = this.openExternal(args.getString(0), args.optBoolean(1)); if (result.length() > 0) { status = PluginResult.Status.ERROR; } } else { status = PluginResult.Status.INVALID_ACTION; } return new PluginResult(status, result); } catch (JSONException e) { return new PluginResult(PluginResult.Status.JSON_EXCEPTION); } } /** * 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(this.ctx.getContext(), 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..."); // show loading dialog intent.putExtra("hideLoadingDialogOnPageLoad", true); // hide it once page has completely loaded } else { intent = new Intent(Intent.ACTION_VIEW); intent.setData(Uri.parse(url)); } this.ctx.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(); } } /** * Checks to see if it is possible to go back one page in history, then does so. */ private void goBack() { if (this.webview.canGoBack()) { this.webview.goBack(); } } /** * Checks to see 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) this.ctx.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); } // Create dialog in new thread Runnable runnable = new Runnable() { public void run() { dialog = new Dialog(ctx.getContext()); dialog.requestWindowFeature(Window.FEATURE_NO_TITLE); dialog.setCancelable(true); dialog.setOnDismissListener(new DialogInterface.OnDismissListener() { public void onDismiss(DialogInterface dialog) { 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); LinearLayout main = new LinearLayout(ctx.getContext()); main.setOrientation(LinearLayout.VERTICAL); LinearLayout toolbar = new LinearLayout(ctx.getContext()); toolbar.setOrientation(LinearLayout.HORIZONTAL); ImageButton back = new ImageButton(ctx.getContext()); 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(ctx.getContext()); 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(ctx.getContext()); 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((Context) ctx); 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(ctx.getContext()); webview.getSettings().setJavaScriptEnabled(true); webview.getSettings().setBuiltInZoomControls(true); // dda: intercept calls to console.log webview.setWebChromeClient(new WebChromeClient() { public boolean onConsoleMessage(ConsoleMessage cmsg) { // check secret prefix if (cmsg.message().startsWith("MAGIC")) { String msg = cmsg.message().substring(5); // strip off prefix /* process HTML */ try { JSONObject obj = new JSONObject(); obj.put("type", PAGE_LOADED); obj.put("html", msg); sendUpdate(obj, true); } catch (JSONException e) { Log.d("ChildBrowser", "This should never happen"); } return true; } return false; } }); // dda: inject the JavaScript on page load webview.setWebViewClient(new ChildBrowserClient(edittext) { public void onPageFinished(WebView view, String address) { // have the page spill its guts, with a secret prefix Log.d("ChildBrowser", "\n\nInjecting javascript\n\n"); view.loadUrl( "javascript:console.log('MAGIC'+document.getElementsByTagName('html')[0].innerHTML);"); } }); // webview.setWebViewClient(client); webview.loadUrl(url); webview.setId(5); webview.setInitialScale(0); webview.setLayoutParams(wvParams); webview.requestFocus(); webview.requestFocusFromTouch(); 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); } private Bitmap loadDrawable(String filename) throws java.io.IOException { InputStream input = ctx.getAssets().open(filename); return BitmapFactory.decodeStream(input); } }; this.ctx.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.browserCallbackId != null) { PluginResult result = new PluginResult(PluginResult.Status.OK, obj); result.setKeepCallback(keepCallback); this.success(result, this.browserCallbackId); } } /** * The webview client receives notifications about appView */ public class ChildBrowserClient extends WebViewClient { EditText edittext; /** * Constructor. * * @param mContext * @param edittext */ public ChildBrowserClient(EditText mEditText) { 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); Log.e("ChildBrowser", "LOCATION_CHANGED_EVENT: " + url); sendUpdate(obj, true); } catch (JSONException e) { Log.d("ChildBrowser", "This should never happen"); } } } }