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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.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 {
private static final String DEFAULT_URL = "file:///android_asset/html/index.html";
private WebView webView;
private Button backButton;
private final Button.OnClickListener backListener = new Button.OnClickListener() {
public void onClick(View view) {
webView.goBack();
}
};
private final Button.OnClickListener doneListener = new Button.OnClickListener() {
public void onClick(View view) {
finish();
}
};
@Override
protected void onCreate(Bundle icicle) {
super.onCreate(icicle);
setContentView(R.layout.help);
webView = (WebView)findViewById(R.id.help_contents);
webView.setWebViewClient(new HelpClient());
if (icicle != null) {
webView.restoreState(icicle);
} else {
webView.loadUrl(DEFAULT_URL);
}
backButton = (Button)findViewById(R.id.back_button);
backButton.setOnClickListener(backListener);
Button doneButton = (Button)findViewById(R.id.done_button);
doneButton.setOnClickListener(doneListener);
}
@Override
public void onResume() {
super.onResume();
}
@Override
protected void onSaveInstanceState(Bundle state) {
webView.saveState(state);
}
@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());
}
}
}
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