AboutActivity.java

package lecho.lib.hellocharts.samples;

import android.annotation.SuppressLint;
import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.content.pm.ResolveInfo;
import android.net.Uri;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v7.app.ActionBarActivity;
import android.util.Log;
import android.util.Pair;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

public class AboutActivity extends ActionBarActivity {
    public static final String TAG = AboutActivity.class.getSimpleName();
    public static final String GITHUB_URL = "github.com/lecho/hellocharts-android";

    public static Pair<String, Integer> getAppVersionAndBuild(Context context) {
        try {
            PackageInfo pInfo = context.getPackageManager().getPackageInfo(context.getPackageName(), 0);
            return new Pair<String, Integer>(pInfo.versionName, pInfo.versionCode);
        } catch (Exception e) {
            Log.e(TAG, "Could not get version number");
            return new Pair<String, Integer>("", 0);
        }
    }

    @SuppressLint("DefaultLocale")
    public static boolean launchWebBrowser(Context context, String url) {
        try {
            url = url.toLowerCase();
            if (!url.startsWith("http://") || !url.startsWith("https://")) {
                url = "http://" + url;
            }

            Intent intent = new Intent(Intent.ACTION_VIEW);
            intent.setData(Uri.parse(url));
            ResolveInfo resolveInfo = context.getPackageManager().resolveActivity(intent,
                    PackageManager.MATCH_DEFAULT_ONLY);
            if (null == resolveInfo) {
                Log.e(TAG, "No activity to handle web intent");
                return false;
            }
            context.startActivity(intent);
            Log.i(TAG, "Launching browser with url: " + url);
            return true;
        } catch (Exception e) {
            Log.e(TAG, "Could not start web browser", e);
            return false;
        }
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_about);
        if (savedInstanceState == null) {
            getSupportFragmentManager().beginTransaction().add(R.id.container, new PlaceholderFragment()).commit();
        }
    }

    /**
     * A placeholder fragment containing a simple view.
     */
    public static class PlaceholderFragment extends Fragment {

        public PlaceholderFragment() {
        }

        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
            View rootView = inflater.inflate(R.layout.fragment_about, container, false);

            TextView version = (TextView) rootView.findViewById(R.id.version);
            version.setText(getAppVersionAndBuild(getActivity()).first);

            TextView gotToGithub = (TextView) rootView.findViewById(R.id.go_to_github);
            gotToGithub.setOnClickListener(new View.OnClickListener() {

                @Override
                public void onClick(View v) {
                    launchWebBrowser(getActivity(), GITHUB_URL);

                }
            });

            return rootView;
        }
    }
}