Android Open Source - esr-scanner Help Activity

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License

The source code is released under:

Apache License

Java Source Code

/*
 * Copyright 2008 ZXing authors/*from w  w  w  .j  av  a 2s.c o  m*/
 * Copyright 2011 Robert Theis
 *
 * 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 ch.luklanis.esscan;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.ActivityNotFoundException;
import android.content.DialogInterface;
import android.content.Intent;
import android.net.MailTo;
import android.net.Uri;
import android.os.Bundle;
import android.util.Log;
import android.view.KeyEvent;
import android.view.View;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.Button;

import java.util.Arrays;
import java.util.Collection;
import java.util.Locale;

/**
 * Activity to display informational pages to the user in a WebView.
 * <p/>
 * The code for this class was adapted from the ZXing project: http://code.google.com/p/zxing
 */
public final class HelpActivity extends Activity {

    private static final String TAG = HelpActivity.class.getSimpleName();

    // 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 ABOUT_PAGE = "about.html";
    public static final String WHATS_NEW_PAGE = "whatsnew.html";

    private static final String WEBVIEW_STATE_PRESENT = "webview_state_present";

    private static final String DEFAULT_LANGUAGE = "en";

    private static final String LANGUAGE;

    private static final String BASE_HELP_URL;

    private static final Collection<String> TRANSLATED_HELP_ASSET_LANGUAGES = Arrays.asList("en",
            "de");

    private static final String BASE_URL = "file:///android_asset/html";

    static {
        Locale locale = Locale.getDefault();
        LANGUAGE = locale == null ? DEFAULT_LANGUAGE : locale.getLanguage();
        BASE_HELP_URL = BASE_URL + "-" + (TRANSLATED_HELP_ASSET_LANGUAGES.contains(LANGUAGE) ? LANGUAGE : DEFAULT_LANGUAGE) + "/";
    }

//  private static final String BASE_HELP_URL = BASE_URL + "-de/";

    private WebView webView;

    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.help);

        // Hide Icon in ActionBar
        getActionBar().setDisplayShowHomeEnabled(false);

        webView = (WebView) findViewById(R.id.help_contents);
        webView.setWebViewClient(new HelpClient(this));

        Intent intent = getIntent();

        // Show an OK button.
        View doneButton = findViewById(R.id.done_button);
        doneButton.setOnClickListener(doneListener);

        // 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.
        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) {

                if (page.equals(DEFAULT_PAGE) || page.equals(ABOUT_PAGE)) {
                    webView.loadUrl(BASE_HELP_URL + page);
                } else {
                    webView.loadUrl(BASE_URL + "/" + page);
                }

            } else {
                webView.loadUrl(BASE_HELP_URL + DEFAULT_PAGE);
            }
        } else {
            webView.loadUrl(BASE_HELP_URL + DEFAULT_PAGE);
        }
    }

    @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 {
        Activity context;

        public HelpClient(Activity context) {
            this.context = context;
        }

        @Override
        public void onPageFinished(WebView view, String url) {
            setTitle(view.getTitle());
        }

        @Override
        public boolean shouldOverrideUrlLoading(WebView view, String url) {
            if (url.startsWith("file")) {
                if (url.contains("{html-lang}")) {
                    String page = url.substring(url.lastIndexOf('/') + 1);
                    view.loadUrl(BASE_HELP_URL + page);
                    return true;
                }
                return false;
            } else if (url.startsWith("mailto:")) {
                try {
                    MailTo mt = MailTo.parse(url);
                    Intent i = new Intent(Intent.ACTION_SEND);
                    i.setType("message/rfc822");
                    i.putExtra(Intent.EXTRA_EMAIL, new String[]{mt.getTo()});
                    i.putExtra(Intent.EXTRA_SUBJECT, mt.getSubject());
                    i.putExtra(Intent.EXTRA_TEXT, mt.getBody());
                    context.startActivity(i);
                    view.reload();
                } catch (ActivityNotFoundException e) {
                    Log.w(TAG, "Problem with Intent.ACTION_SEND", e);
                    new AlertDialog.Builder(context).setTitle("Contact Info")
                            .setMessage("Please send your feedback to: cinusdev@gmail.com")
                            .setPositiveButton("Done", new DialogInterface.OnClickListener() {
                                public void onClick(DialogInterface dialog, int which) {
                                    Log.d("AlertDialog", "Positive");
                                }
                            })
                            .show();
                }
                return true;
            } else {
                // Open external URLs in Browser.
                startActivity(new Intent(Intent.ACTION_VIEW, Uri.parse(url)));
                return true;
            }
        }
    }
}

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