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/*
* Copyright 2008 ZXing authors
*
* Licensed 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.google.zxing.client.android;
import android.app.Activity;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.view.View;
import android.view.KeyEvent;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.Button;
/**
* An HTML-based help screen with Back and Done buttons at the bottom.
*
* @author dswitkin@google.com (Daniel Switkin)
*/
public final class HelpActivity extends Activity {
// Use this key and one of the values below when launching this activity via intent. If not
// present, the default page will be loaded.
public static final String REQUESTED_PAGE_KEY = "requested_page_key";
public static final String DEFAULT_PAGE = "index.html";
public static final String WHATS_NEW_PAGE = "whatsnew.html";
private static final String BASE_URL =
"file:///android_asset/html-" + LocaleManager.getTranslatedAssetLanguage() + '/';
private static final String WEBVIEW_STATE_PRESENT = "webview_state_present";
private WebView webView;
private Button backButton;
private final Button.OnClickListener backListener = new Button.OnClickListener() {
@Override
public void onClick(View view) {
webView.goBack();
}
};
private final Button.OnClickListener doneListener = new Button.OnClickListener() {
@Override
public void onClick(View view) {
finish();
}
};
@Override
protected void onCreate(Bundle icicle) {
super.onCreate(icicle);
setContentView(R.layout.zxing_help);
webView = (WebView)findViewById(R.id.help_contents);
webView.setWebViewClient(new HelpClient());
// Froyo has a bug with calling onCreate() twice in a row, which causes the What's New page
// that's auto-loaded on first run to appear blank. As a workaround we only call restoreState()
// if a valid URL was loaded at the time the previous activity was torn down.
Intent intent = getIntent();
if (icicle != null && icicle.getBoolean(WEBVIEW_STATE_PRESENT, false)) {
webView.restoreState(icicle);
} else if (intent != null) {
String page = intent.getStringExtra(REQUESTED_PAGE_KEY);
if (page != null && page.length() > 0) {
webView.loadUrl(BASE_URL + page);
} else {
webView.loadUrl(BASE_URL + DEFAULT_PAGE);
}
} else {
webView.loadUrl(BASE_URL + DEFAULT_PAGE);
}
backButton = (Button) findViewById(R.id.back_button);
backButton.setOnClickListener(backListener);
View doneButton = findViewById(R.id.done_button);
doneButton.setOnClickListener(doneListener);
}
@Override
protected void onSaveInstanceState(Bundle state) {
String url = webView.getUrl();
if (url != null && url.length() > 0) {
webView.saveState(state);
state.putBoolean(WEBVIEW_STATE_PRESENT, true);
}
}
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_BACK) {
if (webView.canGoBack()) {
webView.goBack();
return true;
}
}
return super.onKeyDown(keyCode, event);
}
private final class HelpClient extends WebViewClient {
@Override
public void onPageFinished(WebView view, String url) {
setTitle(view.getTitle());
backButton.setEnabled(view.canGoBack());
}
@Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
if (url.startsWith("file")) {
// Keep local assets in this WebView.
return false;
} else {
// Open external URLs in Browser.
startActivity(new Intent(Intent.ACTION_VIEW, Uri.parse(url)));
return true;
}
}
}
}
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