name.raev.kaloyan.android.snowcams.CameraActivity.java Source code

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Here is the source code for name.raev.kaloyan.android.snowcams.CameraActivity.java

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/***************************************************************************
 * Copyright (C) 2012  Kaloyan Raev
 * 
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 ***************************************************************************/
package name.raev.kaloyan.android.snowcams;

import android.app.Activity;
import android.os.Bundle;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.view.GestureDetector;
import android.view.GestureDetector.SimpleOnGestureListener;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.View.OnTouchListener;
import android.view.ViewGroup;
import android.widget.FrameLayout;
import android.widget.Toast;

public class CameraActivity extends Activity implements OnClickListener {

    private ViewPager mPager;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        // Gesture detection
        final GestureDetector gestureDetector = new GestureDetector(new DoubleTapDetector());
        OnTouchListener gestureListener = new OnTouchListener() {
            public boolean onTouch(View v, MotionEvent event) {
                return gestureDetector.onTouchEvent(event);
            }
        };

        // create view
        setContentView(R.layout.camera);
        mPager = (ViewPager) findViewById(R.id.pager);
        mPager.setAdapter(new CameraPageAdapter());
        mPager.setPageMargin(8);

        mPager.setOnClickListener(this);
        mPager.setOnTouchListener(gestureListener);

        // find the initial page index - first check if passed with the intent
        int initialPage = getIntent().getIntExtra("index", 0);
        // check if there is a cached state
        Object cachedObject = getLastNonConfigurationInstance();
        if (cachedObject != null) {
            // cache found - scroll to the cached page index
            initialPage = (Integer) cachedObject;
        }

        // scroll to the initial page
        mPager.setCurrentItem(initialPage);
    }

    /*
     * Cache the current page index.
     */
    @Override
    public Object onRetainNonConfigurationInstance() {
        return mPager.getCurrentItem();
    }

    @Override
    public void onClick(View v) {
        // do nothing here - the gesture listener will process the event
    }

    public CameraPage getCameraPage(int index) {
        for (int i = 0; i < mPager.getChildCount(); i++) {
            CameraPage page = (CameraPage) mPager.getChildAt(i);
            if (page.getIndex() == index) {
                return page;
            }
        }
        return null;
    }

    private class CameraPageAdapter extends PagerAdapter {

        @Override
        public int getCount() {
            return Camera.count();
        }

        @Override
        public boolean isViewFromObject(View view, Object object) {
            return view == object;
        }

        @Override
        public Object instantiateItem(ViewGroup container, int position) {
            CameraPage page = new CameraPage(CameraActivity.this, position);
            container.addView(page);
            page.createContent();
            return page;
        }

        @Override
        public void destroyItem(ViewGroup container, int position, Object object) {
            container.removeView((FrameLayout) object);
        }

    }

    private class DoubleTapDetector extends SimpleOnGestureListener {

        /*
         * Show camera name. 
         */
        @Override
        public boolean onSingleTapConfirmed(MotionEvent e) {
            String label = Camera.labelFor(mPager.getCurrentItem());
            Toast.makeText(getApplicationContext(), label, Toast.LENGTH_SHORT).show();
            return true;
        }

        /*
         * Reload camera. 
         */
        @Override
        public boolean onDoubleTap(MotionEvent e) {
            // reload the camera image on double tap
            new DownloadImageTask(CameraActivity.this, mPager.getCurrentItem()).execute();
            return true;
        }

    }

}