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.cloudexplorers.plugins.childBrowser; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.util.Map; import java.io.File; import java.net.HttpURLConnection; import java.net.MalformedURLException; import java.net.URL; import java.util.HashMap; import org.apache.cordova.api.Plugin; import org.apache.cordova.api.PluginResult; 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.text.InputType; import android.util.Log; import android.util.Base64; import android.util.TypedValue; import android.view.Gravity; 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.EditorInfo; import android.view.inputmethod.InputMethodManager; import android.webkit.WebChromeClient; import android.webkit.WebSettings; import android.webkit.WebView; import android.webkit.WebViewClient; import android.widget.EditText; import android.widget.ImageButton; import android.widget.LinearLayout; import android.widget.RelativeLayout; import android.os.Environment; import android.net.Uri; 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 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.getString(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 urlToOpen, String encodedCredentials) { try { // set the download URL, a url that points to a file on the internet // this is the file to be downloaded URL url = new URL(urlToOpen); // create the new connection HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection(); // set up some things on the connection urlConnection.setRequestMethod("GET"); urlConnection.setDoOutput(true); urlConnection.setRequestProperty("Authorization", encodedCredentials); // and connect! urlConnection.connect(); // set the path where we want to save the file // in this case, going to save it on the root directory of the // sd card. File SDCardRoot = Environment.getExternalStorageDirectory(); // create a new file, specifying the path, and the filename // which we want to save the file as. File file = new File(SDCardRoot, "temp.pdf"); // this will be used to write the downloaded data into the file we created FileOutputStream fileOutput = new FileOutputStream(file); // this will be used in reading the data from the internet InputStream inputStream = urlConnection.getInputStream(); // this is the total size of the file int totalSize = urlConnection.getContentLength(); // variable to store total downloaded bytes int downloadedSize = 0; // create a buffer... byte[] buffer = new byte[1024]; int bufferLength = 0; // used to store a temporary size of the buffer // now, read through the input buffer and write the contents to the file while ((bufferLength = inputStream.read(buffer)) > 0) { // add the data in the buffer to the file in the file output stream (the // file on the sd card fileOutput.write(buffer, 0, bufferLength); // add up the size so we know how much is downloaded downloadedSize += bufferLength; } // close the output stream when done fileOutput.close(); Uri path = Uri.fromFile(file); Intent intent = new Intent(Intent.ACTION_VIEW); intent.setDataAndType(path, "application/pdf"); intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP); this.cordova.getActivity().startActivity(intent); // catch some possible errors... } catch (MalformedURLException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } return ""; } /** * 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.cordova.getActivity() .getSystemService(Context.INPUT_METHOD_SERVICE); imm.hideSoftInputFromWindow(edittext.getWindowToken(), 0); if (!url.startsWith("http") && !url.startsWith("file:")) { this.webview.loadUrl("http://" + url); } else { 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() { /** * Convert our DIP units to Pixels * * @return int */ private int dpToPixels(int dipValue) { int value = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, (float) dipValue, cordova.getActivity().getResources().getDisplayMetrics()); return value; } public void run() { // Let's create the main dialog dialog = new Dialog(cordova.getActivity(), android.R.style.Theme_NoTitleBar); dialog.getWindow().getAttributes().windowAnimations = android.R.style.Animation_Dialog; 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"); } } }); // Main container layout LinearLayout main = new LinearLayout(cordova.getActivity()); main.setOrientation(LinearLayout.VERTICAL); // Toolbar layout RelativeLayout toolbar = new RelativeLayout(cordova.getActivity()); toolbar.setLayoutParams( new RelativeLayout.LayoutParams(LayoutParams.FILL_PARENT, this.dpToPixels(44))); toolbar.setPadding(this.dpToPixels(2), this.dpToPixels(2), this.dpToPixels(2), this.dpToPixels(2)); toolbar.setHorizontalGravity(Gravity.LEFT); toolbar.setVerticalGravity(Gravity.TOP); // Action Button Container layout RelativeLayout actionButtonContainer = new RelativeLayout(cordova.getActivity()); actionButtonContainer.setLayoutParams( new RelativeLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT)); actionButtonContainer.setHorizontalGravity(Gravity.LEFT); actionButtonContainer.setVerticalGravity(Gravity.CENTER_VERTICAL); actionButtonContainer.setId(1); // Back button ImageButton back = new ImageButton(cordova.getActivity()); RelativeLayout.LayoutParams backLayoutParams = new RelativeLayout.LayoutParams( LayoutParams.WRAP_CONTENT, LayoutParams.FILL_PARENT); backLayoutParams.addRule(RelativeLayout.ALIGN_LEFT); back.setLayoutParams(backLayoutParams); back.setContentDescription("Back Button"); back.setId(2); try { back.setImageBitmap(loadDrawable("www/childbrowser/icon_arrow_left.png")); } catch (IOException e) { Log.e(LOG_TAG, e.getMessage(), e); } back.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { goBack(); } }); // Forward button ImageButton forward = new ImageButton(cordova.getActivity()); RelativeLayout.LayoutParams forwardLayoutParams = new RelativeLayout.LayoutParams( LayoutParams.WRAP_CONTENT, LayoutParams.FILL_PARENT); forwardLayoutParams.addRule(RelativeLayout.RIGHT_OF, 2); forward.setLayoutParams(forwardLayoutParams); forward.setContentDescription("Forward Button"); forward.setId(3); try { forward.setImageBitmap(loadDrawable("www/childbrowser/icon_arrow_right.png")); } catch (IOException e) { Log.e(LOG_TAG, e.getMessage(), e); } forward.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { goForward(); } }); // Edit Text Box edittext = new EditText(cordova.getActivity()); RelativeLayout.LayoutParams textLayoutParams = new RelativeLayout.LayoutParams( LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT); textLayoutParams.addRule(RelativeLayout.RIGHT_OF, 1); textLayoutParams.addRule(RelativeLayout.LEFT_OF, 5); edittext.setLayoutParams(textLayoutParams); edittext.setId(4); edittext.setSingleLine(true); edittext.setText(url); edittext.setInputType(InputType.TYPE_TEXT_VARIATION_URI); edittext.setImeOptions(EditorInfo.IME_ACTION_GO); edittext.setInputType(InputType.TYPE_NULL); // Will not except input... // Makes the text // NON-EDITABLE 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; } }); // Close button ImageButton close = new ImageButton(cordova.getActivity()); RelativeLayout.LayoutParams closeLayoutParams = new RelativeLayout.LayoutParams( LayoutParams.WRAP_CONTENT, LayoutParams.FILL_PARENT); closeLayoutParams.addRule(RelativeLayout.ALIGN_PARENT_RIGHT); close.setLayoutParams(closeLayoutParams); forward.setContentDescription("Close Button"); close.setId(5); try { close.setImageBitmap(loadDrawable("www/childbrowser/icon_close.png")); } catch (IOException e) { Log.e(LOG_TAG, e.getMessage(), e); } close.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { closeDialog(); } }); // WebView webview = new WebView(cordova.getActivity()); webview.setLayoutParams( new LinearLayout.LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT)); webview.setWebChromeClient(new WebChromeClient()); WebViewClient client = new ChildBrowserClient(edittext); webview.setWebViewClient(client); WebSettings settings = webview.getSettings(); settings.setJavaScriptEnabled(true); settings.setJavaScriptCanOpenWindowsAutomatically(true); settings.setBuiltInZoomControls(true); settings.setPluginsEnabled(true); settings.setDomStorageEnabled(true); webview.loadUrl(url); webview.setId(6); webview.getSettings().setLoadWithOverviewMode(true); webview.getSettings().setUseWideViewPort(true); webview.getSettings().setJavaScriptEnabled(true); webview.getSettings().setPluginsEnabled(true); webview.requestFocus(); webview.requestFocusFromTouch(); // Add the back and forward buttons to our action button container // layout actionButtonContainer.addView(back); actionButtonContainer.addView(forward); // Add the views to our toolbar toolbar.addView(actionButtonContainer); toolbar.addView(edittext); toolbar.addView(close); // Don't add the toolbar if its been disabled if (getShowLocationBar()) { // Add our toolbar to our main view/layout main.addView(toolbar); } // Add our webview to our main view/layout 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 = cordova.getActivity().getAssets().open(filename); return BitmapFactory.decodeStream(input); } }; this.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.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:") || url.startsWith("file:")) { 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"); } } } }