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StepActivity.java
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StepActivity.java
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package br.com.ericksprengel.android.baking.ui.recipe;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v4.view.ViewPager;
import android.support.v7.app.ActionBar;
import android.view.MenuItem;
import android.view.View;
import java.util.List;
import br.com.ericksprengel.android.baking.R;
import br.com.ericksprengel.android.baking.data.Step;
import br.com.ericksprengel.android.baking.data.source.RecipesDataSource;
import br.com.ericksprengel.android.baking.data.source.RecipesRepository;
import br.com.ericksprengel.android.baking.ui.BaseActivity;
import br.com.ericksprengel.android.baking.util.Inject;
public class StepActivity extends BaseActivity implements View.OnClickListener, StepFragment.OnPlayerControlsVisibilityChangeListener {
private static final String ARG_RECIPE_ID = "recipe_id";
private static final String ARG_STEP_ID = "step_id";
private int mRecipeId;
private int mStepId;
private List<Step> mSteps;
private RecipesRepository mRecipesRepository;
private StepPagerAdapter mStepPagerAdapter;
private ViewPager mViewPager;
private FloatingActionButton mNavLeft;
private FloatingActionButton mNavRight;
private int mCurrentItem = 0;
private boolean mIsShowingControls = true;
public static Intent getStartIntent(Context context, Step step) {
Intent intent = new Intent(context, StepActivity.class);
intent.putExtra(ARG_RECIPE_ID, step.getRecipeId());
intent.putExtra(ARG_STEP_ID, step.getId());
return intent;
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_step);
mRecipeId = getIntent().getIntExtra(ARG_RECIPE_ID, -1);
mStepId = getIntent().getIntExtra(ARG_STEP_ID, -1);
mRecipesRepository = Inject.getRecipeRepository(this);
// Show the Up button in the action bar.
ActionBar actionBar = getSupportActionBar();
if (actionBar != null) {
actionBar.setDisplayHomeAsUpEnabled(true);
}
// ViewPager and its adapters use support library
// fragments, so use getSupportFragmentManager.
mStepPagerAdapter = new StepPagerAdapter(
getSupportFragmentManager());
mViewPager = findViewById(R.id.step_ac_steps_viewpager);
mViewPager.setAdapter(mStepPagerAdapter);
mViewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
}
@Override
public void onPageSelected(int position) {
StepFragment cachedFragmentLeaving = mStepPagerAdapter.getCachedItem(mCurrentItem);
if (cachedFragmentLeaving != null) {
cachedFragmentLeaving.losingVisibility();
}
mCurrentItem = position;
StepFragment cachedFragmentEntering = mStepPagerAdapter.getCachedItem(mCurrentItem);
if (cachedFragmentEntering != null) {
cachedFragmentEntering.gainVisibility();
}
updateNavControls();
getSupportActionBar().setTitle(mSteps.get(position).getShortDescription());
}
@Override
public void onPageScrollStateChanged(int state) {
}
});
mViewPager.setPageTransformer(true, new ViewPager.PageTransformer() {
private static final float MIN_SCALE = 0.85f;
private static final float MIN_ALPHA = 0.5f;
@Override
public void transformPage(@NonNull View page, float position) {
int pageWidth = page.getWidth();
int pageHeight = page.getHeight();
View view = page; //page.findViewById(R.id.step_frag_description_textview);
if (position < -1) { // [-Infinity,-1)
// This page is way off-screen to the left.
view.setAlpha(0);
} else if (position <= 1) { // [-1,1]
// Modify the default slide transition to shrink the page as well
float scaleFactor = Math.max(MIN_SCALE, 1 - Math.abs(position));
float vertMargin = pageHeight * (1 - scaleFactor) / 2;
float horzMargin = pageWidth * (1 - scaleFactor) / 2;
if (position < 0) {
view.setTranslationX(horzMargin - vertMargin / 2);
} else {
view.setTranslationX(-horzMargin + vertMargin / 2);
}
// Scale the page down (between MIN_SCALE and 1)
view.setScaleX(scaleFactor);
view.setScaleY(scaleFactor);
// Fade the page relative to its size.
view.setAlpha(MIN_ALPHA +
(scaleFactor - MIN_SCALE) /
(1 - MIN_SCALE) * (1 - MIN_ALPHA));
} else { // (1,+Infinity]
// This page is way off-screen to the right.
view.setAlpha(0);
}
}
});
mNavLeft = findViewById(R.id.step_ac_nav_left);
mNavRight = findViewById(R.id.step_ac_nav_right);
mNavLeft.setOnClickListener(this);
mNavRight.setOnClickListener(this);
loadSteps();
}
private void loadSteps() {
mRecipesRepository.getSteps(mRecipeId, new RecipesDataSource.LoadStepsCallback() {
@Override
public void onStepsLoaded(List<Step> steps) {
mSteps = steps;
mStepPagerAdapter.setSteps(mSteps);
for (int position = 0; position < mSteps.size(); position++) {
Step step = mSteps.get(position);
if (step.getId() == mStepId) {
mCurrentItem = position;
mViewPager.setCurrentItem(mCurrentItem, true);
// It's just to update the ui for the first item.
// the ViewPager.OnPageChangeListener is not called for the first step.
updateNavControls();
getSupportActionBar().setTitle(mSteps.get(position).getShortDescription());
}
}
}
@Override
public void onDataNotAvailable() {
Snackbar.make(mViewPager, getString(R.string.internal_error), Snackbar.LENGTH_LONG).show();
}
});
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
if (id == android.R.id.home) {
finish();
return true;
}
return super.onOptionsItemSelected(item);
}
@Override
public void onClick(View view) {
int currentItem = mViewPager.getCurrentItem();
switch (view.getId()) {
case R.id.step_ac_nav_left:
mViewPager.setCurrentItem(--currentItem, true);
break;
case R.id.step_ac_nav_right:
mViewPager.setCurrentItem(++currentItem, true);
break;
default:
throw new UnsupportedOperationException("Invalid action to viewId: " + view.getId());
}
}
@Override
protected void onPostCreate(Bundle savedInstanceState) {
super.onPostCreate(savedInstanceState);
// Trigger the initial hide() shortly after the activity has been
// created, to briefly hint to the user that UI controls
// are available.
if (getResources().getBoolean(R.bool.step_ac_fullscreen)) {
// Note that some of these constants are new as of API 16 (Jelly Bean)
// and API 19 (KitKat). It is safe to use them, as they are inlined
// at compile-time and do nothing on earlier devices.
mViewPager.setSystemUiVisibility(View.SYSTEM_UI_FLAG_LOW_PROFILE
| View.SYSTEM_UI_FLAG_FULLSCREEN
| View.SYSTEM_UI_FLAG_LAYOUT_STABLE
| View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY
| View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
| View.SYSTEM_UI_FLAG_HIDE_NAVIGATION);
}
}
@Override
public void onPlayerControlesVisibilityChanged(boolean isShowingControls) {
if (!getResources().getBoolean(R.bool.step_ac_fullscreen)) {
return;
}
mIsShowingControls = isShowingControls;
updateNavControls();
}
@Override
public boolean isStepSelected(int stepId) {
return mSteps.get(mCurrentItem).getId() == stepId;
}
private void updateNavControls() {
if (!mIsShowingControls) {
mNavLeft.setVisibility(View.GONE);
mNavRight.setVisibility(View.GONE);
} else {
mNavLeft.setVisibility(mCurrentItem == 0 ? View.GONE : View.VISIBLE);
mNavRight.setVisibility(mCurrentItem == mSteps.size() - 1 ? View.GONE : View.VISIBLE);
}
}
}