ViewActivity.java

package com.ianhanniballake.contractiontimer.ui;

import android.content.ContentUris;
import android.content.Context;
import android.content.SharedPreferences;
import android.content.pm.ActivityInfo;
import android.database.Cursor;
import android.net.Uri;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentStatePagerAdapter;
import android.support.v4.app.LoaderManager;
import android.support.v4.content.CursorLoader;
import android.support.v4.content.Loader;
import android.support.v4.view.ViewCompat;
import android.support.v4.view.ViewPager;
import android.support.v4.widget.CursorAdapter;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;

import com.google.firebase.analytics.FirebaseAnalytics;
import com.google.firebase.crash.FirebaseCrash;
import com.ianhanniballake.contractiontimer.BuildConfig;
import com.ianhanniballake.contractiontimer.R;
import com.ianhanniballake.contractiontimer.provider.ContractionContract;
import com.ianhanniballake.contractiontimer.provider.ContractionContract.Contractions;

/**
 * Stand alone activity used to view the details of an individual contraction
 */
public class ViewActivity extends AppCompatActivity implements LoaderManager.LoaderCallbacks<Cursor>,
        ViewPager.OnPageChangeListener {
    private final static String TAG = ViewActivity.class.getSimpleName();
    /**
     * Adapter for all contractions
     */
    CursorAdapter adapter = null;
    /**
     * Currently shown page
     */
    int currentPosition = -1;
    /**
     * Pager Adapter to manage view contraction pages
     */
    private ViewFragmentPagerAdapter pagerAdapter;

    @Override
    public void onCreate(final Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_view);
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);
        if (findViewById(R.id.pager) == null) {
            // A null pager means we no longer need this activity
            finish();
            return;
        }
        adapter = new CursorAdapter(this, null, 0) {
            @Override
            public void bindView(final View view, final Context context, final Cursor cursor) {
                // Nothing to do
            }

            @Override
            public View newView(final Context context, final Cursor cursor, final ViewGroup parent) {
                return null;
            }
        };
        final ViewPager pager = (ViewPager) findViewById(R.id.pager);
        pager.addOnPageChangeListener(this);
        pagerAdapter = new ViewFragmentPagerAdapter(getSupportFragmentManager());
        getSupportLoaderManager().initLoader(0, null, this);
    }

    @Override
    public Loader<Cursor> onCreateLoader(final int id, final Bundle args) {
        return new CursorLoader(this, ContractionContract.Contractions.CONTENT_URI, null, null, null,
                Contractions.COLUMN_NAME_START_TIME);
    }

    @Override
    public boolean onCreateOptionsMenu(final Menu menu) {
        getMenuInflater().inflate(R.menu.activity_view, menu);
        return super.onCreateOptionsMenu(menu);
    }

    @Override
    public void onLoaderReset(final Loader<Cursor> loader) {
        adapter.swapCursor(null);
        pagerAdapter.notifyDataSetChanged();
    }

    @Override
    public void onLoadFinished(final Loader<Cursor> loader, final Cursor data) {
        adapter.swapCursor(data);
        pagerAdapter.notifyDataSetChanged();
        // A null content uri means we should cancel out as we are in an indeterminate state
        final Uri contentUri = getIntent() == null ? null : getIntent().getData();
        if (contentUri == null) {
            finish();
            return;
        }
        final long contractionId;
        try {
            contractionId = ContentUris.parseId(contentUri);
        } catch (final NumberFormatException e) {
            if (BuildConfig.DEBUG)
                Log.e(TAG, "NumberFormatException in onLoadFinished", e);
            else {
                FirebaseCrash.report(e);
            }
            finish();
            return;
        }
        final int count = adapter.getCount();
        for (int position = 0; position < count; position++) {
            final long id = adapter.getItemId(position);
            if (id == contractionId) {
                currentPosition = position;
                break;
            }
        }
        if (currentPosition == -1)
            finish();
        final ViewPager pager = (ViewPager) findViewById(R.id.pager);
        pager.setAdapter(pagerAdapter);
        pager.setCurrentItem(currentPosition, false);
    }

    @Override
    public boolean onOptionsItemSelected(final MenuItem item) {
        if (item.getItemId() == android.R.id.home) {
            if (BuildConfig.DEBUG)
                Log.d(TAG, "View selected home");
        }
        return super.onOptionsItemSelected(item);
    }

    @Override
    public void onPageScrolled(final int position, final float positionOffset, final int positionOffsetPixels) {
        // Nothing to do
    }

    @Override
    public void onPageScrollStateChanged(final int state) {
        // Nothing to do
    }

    @Override
    public void onPageSelected(final int position) {
        if (BuildConfig.DEBUG)
            Log.d(TAG, "Swapped to " + position);
        currentPosition = position;
        final long newContractionId = adapter.getItemId(position);
        getIntent().setData(
                ContentUris.withAppendedId(ContractionContract.Contractions.CONTENT_ID_URI_BASE, newContractionId));
    }

    @Override
    protected void onResume() {
        super.onResume();
        final SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(this);
        final boolean isLockPortrait = preferences.getBoolean(Preferences.LOCK_PORTRAIT_PREFERENCE_KEY, getResources()
                .getBoolean(R.bool.pref_lock_portrait_default));
        if (BuildConfig.DEBUG)
            Log.d(TAG, "Lock Portrait: " + isLockPortrait);
        if (isLockPortrait)
            setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
        else
            setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_SENSOR);
    }

    @Override
    protected void onStart() {
        super.onStart();
        getSupportActionBar().setDisplayHomeAsUpEnabled(true);
        getSupportActionBar().setElevation(0);
        ViewCompat.setElevation(findViewById(R.id.pager_title_strip),
                getResources().getDimension(R.dimen.action_bar_elevation));
        if (getIntent().hasExtra(MainActivity.LAUNCHED_FROM_WIDGET_EXTRA)) {
            final String widgetIdentifier = getIntent().getStringExtra(MainActivity.LAUNCHED_FROM_WIDGET_EXTRA);
            if (BuildConfig.DEBUG)
                Log.d(TAG, "Launched from " + widgetIdentifier);
            FirebaseAnalytics.getInstance(this).logEvent(widgetIdentifier + "_view_launch", null);
            getIntent().removeExtra(MainActivity.LAUNCHED_FROM_WIDGET_EXTRA);
        }
    }

    /**
     * Creates ViewFragments as necessary
     */
    private class ViewFragmentPagerAdapter extends FragmentStatePagerAdapter {
        /**
         * Creates a new ViewFragmentPagerAdapter
         *
         * @param fm FragmentManager used to manage fragments
         */
        public ViewFragmentPagerAdapter(final FragmentManager fm) {
            super(fm);
        }

        @Override
        public int getCount() {
            return adapter == null ? 0 : adapter.getCount();
        }

        @Override
        public Fragment getItem(final int position) {
            return ViewFragment.createInstance(adapter.getItemId(position));
        }

        @Override
        public CharSequence getPageTitle(final int position) {
            if (position + 1 == currentPosition)
                return getText(R.string.detail_previous_page);
            else if (position - 1 == currentPosition)
                return getText(R.string.detail_next_page);
            else
                return null;
        }
    }
}