Java tutorial
/** * **************************************************************************** * Copyright 2011, 2012 Chris Banes. * <p/> * 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 * <p/> * http://www.apache.org/licenses/LICENSE-2.0 * <p/> * 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 com.example.maxuan.photoutils; import android.animation.Animator; import android.animation.AnimatorListenerAdapter; import android.app.Activity; import android.app.AlertDialog; import android.content.Context; import android.content.DialogInterface; import android.content.Intent; import android.os.Build; import android.os.Bundle; import android.support.annotation.NonNull; import android.support.v4.view.PagerAdapter; import android.support.v4.view.ViewPager; import android.support.v7.app.AppCompatActivity; import android.support.v7.widget.LinearLayoutManager; import android.support.v7.widget.RecyclerView; import android.util.SparseArray; import android.util.SparseIntArray; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.view.ViewGroup.LayoutParams; import android.widget.Button; import android.widget.CheckBox; import android.widget.ImageView; import android.widget.Toast; import com.facebook.drawee.view.SimpleDraweeView; import java.util.ArrayList; import java.util.List; import uk.co.senab.photoview.PhotoView; import uk.co.senab.photoview.PhotoViewAttacher; /** * Lock/Unlock button is added to the ActionBar. * Use it to temporarily disable ViewPager navigation in order to correctly interact with ImageView by gestures. * Lock/Unlock state of ViewPager is saved and restored on configuration changes. * * Julia Zudikova */ public class ViewPagerActivity extends AppCompatActivity implements View.OnClickListener, ViewPager.OnPageChangeListener { public static void BrowserPhotos(Activity activity, ArrayList<Photo> photos, int index, int maxCount, SparseArray<Photo> selectedPhotos) { Intent intent = new Intent(activity, ViewPagerActivity.class); Bundle bundle = new Bundle(); bundle.putSparseParcelableArray("selectedPhotos", selectedPhotos); bundle.putParcelableArrayList("photos", photos); bundle.putInt("position", index); bundle.putInt("maxCount", index); intent.putExtra("data", bundle); activity.startActivityForResult(intent, REQUEST_PAGE_SELECT_CODE); } public static final int REQUEST_PAGE_SELECT_CODE = 12; private static final String ISLOCKED_ARG = "isLocked"; private ViewPager mViewPager; private ImageView cancelBtn; private RecyclerView recyclerView; private CheckBox selectCheckBox; private Button completeBtn; private int position; PhotoPagerAdapter adapter; SelectedPhotoAdapter selectedPhotoAdapter; ArrayList<Photo> photos; SparseIntArray posArray; SparseArray<Photo> selectedPhotoArray; private int maxCount = 9; private final String format = "(%d/9)?"; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_select_viewpager); mViewPager = (HackyViewPager) findViewById(R.id.view_pager); recyclerView = (RecyclerView) findViewById(R.id.recyclerView); cancelBtn = (ImageView) findViewById(R.id.selectCancel); cancelBtn.setOnClickListener(this); selectCheckBox = (CheckBox) findViewById(R.id.checkbox); selectCheckBox.setOnClickListener(this); completeBtn = (Button) findViewById(R.id.completeBtn); completeBtn.setOnClickListener(this); photos = new ArrayList<>(); posArray = new SparseIntArray(10); adapter = new PhotoPagerAdapter(this, photos); mViewPager.setAdapter(adapter); mViewPager.addOnPageChangeListener(this); Intent intent = getIntent(); if (intent != null) { Bundle bundle = intent.getBundleExtra("data"); if (bundle == null) return; selectedPhotoArray = bundle.getSparseParcelableArray("selectedPhotos"); completeBtn.setText(String.format(format, selectedPhotoArray.size())); List<Photo> list = bundle.getParcelableArrayList("photos"); if (list != null) photos.addAll(list); for (int i = 0; i < photos.size(); ++i) { posArray.put(photos.get(i).id, i); } position = bundle.getInt("position", 0); maxCount = bundle.getInt("maxCount", 9); adapter.notifyDataSetChanged(); mViewPager.setCurrentItem(position); selectCheckBox.setChecked(selectedPhotoArray.indexOfKey(photos.get(position).id) >= 0); } selectedPhotoAdapter = new SelectedPhotoAdapter(this); LinearLayoutManager layoutManager = new LinearLayoutManager(this); layoutManager.setOrientation(LinearLayoutManager.HORIZONTAL); layoutManager.setReverseLayout(true); recyclerView.setLayoutManager(layoutManager); recyclerView.setAdapter(selectedPhotoAdapter); recyclerView.setVisibility(selectedPhotoArray.size() > 0 ? View.VISIBLE : View.GONE); if (savedInstanceState != null) { boolean isLocked = savedInstanceState.getBoolean(ISLOCKED_ARG, false); ((HackyViewPager) mViewPager).setLocked(isLocked); } if (Build.VERSION.SDK_INT < Build.VERSION_CODES.KITKAT) return; getWindow().getDecorView() .setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_STABLE | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN | View.SYSTEM_UI_FLAG_FULLSCREEN | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY); } private void handleSelectedPhotoView(final boolean show) { recyclerView.animate().translationY(0).alpha(show ? 1.0f : 0.0f).setListener(new AnimatorListenerAdapter() { @Override public void onAnimationEnd(Animator animation) { super.onAnimationEnd(animation); recyclerView.setVisibility(show ? View.VISIBLE : View.GONE); } }); } @Override public void onClick(View v) { if (v.getId() == R.id.selectCancel) { AlertDialog.Builder builder = new AlertDialog.Builder(this); builder.setTitle("").setPositiveButton("", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { finish(); } }).setNegativeButton("?", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { dialog.dismiss(); if (Build.VERSION.SDK_INT < Build.VERSION_CODES.KITKAT) return; getWindow().getDecorView() .setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_STABLE | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN | View.SYSTEM_UI_FLAG_FULLSCREEN | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY); } }).create().show(); } else if (v.getId() == R.id.checkbox) { Photo photo = photos.get(mViewPager.getCurrentItem()); int pos = selectedPhotoArray.indexOfKey(photo.id); if (selectCheckBox.isChecked() && pos < 0) { if (selectedPhotoArray.size() < 9) { selectedPhotoArray.append(photo.id, photo); selectedPhotoAdapter.notifyDataSetChanged(); recyclerView.scrollToPosition(selectedPhotoArray.indexOfKey(photo.id)); } else { Toast.makeText(this, "??", Toast.LENGTH_SHORT).show(); selectCheckBox.setChecked(false); } } else if (!selectCheckBox.isChecked() && pos >= 0) { selectedPhotoArray.remove(photo.id); selectedPhotoAdapter.notifyItemRemoved(pos); // recyclerView.scrollToPosition(pos>0?pos-1:0); } completeBtn.setText(String.format(format, selectedPhotoArray.size())); handleSelectedPhotoView(selectedPhotoArray.size() != 0); } else if (v.getId() == R.id.completeBtn) { Intent intent = new Intent(); Bundle bundle = new Bundle(); bundle.putSparseParcelableArray("selectedPhotos", selectedPhotoArray); intent.putExtra("data", bundle); setResult(RESULT_OK, intent); finish(); } } @Override public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) { } @Override public void onPageSelected(int position) { Photo photo = photos.get(position); int pos = selectedPhotoArray.indexOfKey(photo.id); selectCheckBox.setChecked(pos >= 0); if (selectedPhotoAdapter != null && pos >= 0) { selectedPhotoAdapter.notifyDataSetChanged(); recyclerView.scrollToPosition(pos); } } @Override public void onPageScrollStateChanged(int state) { } public class SelectedPhotoAdapter extends RecyclerView.Adapter<SelectedPhotoViewHolder> { LayoutInflater inflater; public SelectedPhotoAdapter(Context context) { this.inflater = LayoutInflater.from(context); } @Override public SelectedPhotoViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { return new SelectedPhotoViewHolder(inflater.inflate(R.layout.layout_image, parent, false)); } @Override public void onBindViewHolder(SelectedPhotoViewHolder holder, int position) { Photo photo = selectedPhotoArray.valueAt(position); holder.image.setController(PhotoUtils.getDraweeController(holder.image, photo.url, 160, 160)); holder.sign.setVisibility( photos.get(mViewPager.getCurrentItem()).id == photo.id ? View.GONE : View.VISIBLE); } @Override public int getItemCount() { return selectedPhotoArray.size(); } } public class SelectedPhotoViewHolder extends RecyclerView.ViewHolder { public SimpleDraweeView image; public View sign; public SelectedPhotoViewHolder(View itemView) { super(itemView); image = (SimpleDraweeView) itemView.findViewById(R.id.image); image.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { Photo photo = selectedPhotoArray.valueAt(getAdapterPosition()); int pos = posArray.get(photo.id); mViewPager.setCurrentItem(pos, false); } }); sign = itemView.findViewById(R.id.sign); } } public class PhotoPagerAdapter extends PagerAdapter implements PhotoViewAttacher.OnViewTapListener { Context context; List<Photo> photoList; public PhotoPagerAdapter(Context context, ArrayList<Photo> list) { this.photoList = list; this.context = context; } @Override public int getCount() { return photoList == null ? 0 : photoList.size(); } @Override public View instantiateItem(ViewGroup container, int position) { PhotoView photoView = new PhotoView(container.getContext()); photoView.setImageUri(PhotoUtils.parseUrl(photoList.get(position).url)); photoView.setOnViewTapListener(this); // Now just add PhotoView to ViewPager and return it container.addView(photoView, LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT); return photoView; } @Override public void destroyItem(ViewGroup container, int position, Object object) { container.removeView((View) object); } @Override public boolean isViewFromObject(View view, Object object) { return view == object; } @Override public void onViewTap(View view, float x, float y) { if (selectedPhotoArray.size() > 0) handleSelectedPhotoView(recyclerView.getVisibility() != View.VISIBLE); } } private boolean isViewPagerActive() { return (mViewPager != null && mViewPager instanceof HackyViewPager); } @Override protected void onSaveInstanceState(@NonNull Bundle outState) { if (isViewPagerActive()) { outState.putBoolean(ISLOCKED_ARG, ((HackyViewPager) mViewPager).isLocked()); } super.onSaveInstanceState(outState); } }