ImagePagerActivity.java

/**
 * ****************************************************************************
 * Copyright 2011-2013 Sergey Tarasevich
 * <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 net.coding.program;

import android.content.DialogInterface;
import android.content.Intent;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentStatePagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v7.app.ActionBar;
import android.support.v7.app.AlertDialog;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

import com.nostra13.universalimageloader.core.DisplayImageOptions;
import com.nostra13.universalimageloader.core.assist.ImageScaleType;
import com.nostra13.universalimageloader.core.display.FadeInBitmapDisplayer;

import net.coding.program.common.ui.BackActivity;

import org.androidannotations.annotations.AfterViews;
import org.androidannotations.annotations.EActivity;
import org.androidannotations.annotations.Extra;
import org.androidannotations.annotations.OptionsItem;
import org.androidannotations.annotations.ViewById;

import java.util.ArrayList;

@EActivity(R.layout.activity_image_pager)
public class ImagePagerActivity extends BackActivity {

    private final String SAVE_INSTANCE_INDEX = "SAVE_INSTANCE_INDEX";
    DisplayImageOptions options;
    @ViewById
    ViewPager pager;
    @Extra
    int mPagerPosition;
    @Extra
    ArrayList<String> mArrayUri;
    @Extra
    boolean isPrivate;
    @Extra
    String mSingleUri;
    @Extra
    boolean needEdit;
    ImagePager adapter;

    ArrayList<String> mDelUrls = new ArrayList<>();

    TextView mMenuImagePos;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        if (savedInstanceState != null) {
            mPagerPosition = savedInstanceState.getInt(SAVE_INSTANCE_INDEX, mPagerPosition);
        }
    }

    @AfterViews
    void init() {
        if (needEdit) {
            ActionBar supportActionBar = getSupportActionBar();
            supportActionBar.setIcon(android.R.color.transparent);

            View v = getLayoutInflater().inflate(R.layout.image_pager_action_custom, null);
            mMenuImagePos = (TextView) v.findViewById(R.id.imagePos);
            supportActionBar.setCustomView(v);

            supportActionBar.setDisplayShowCustomEnabled(true);
            pager.setBackgroundColor(getResources().getColor(R.color.stand_bg));

            pager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {
                @Override
                public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {

                }

                @Override
                public void onPageSelected(int position) {
                    setPosDisplay(position);
                }

                @Override
                public void onPageScrollStateChanged(int state) {

                }
            });
            setPosDisplay(0);
        } else {
            getSupportActionBar().hide();
            pager.setBackgroundColor(getResources().getColor(R.color.black));
        }

        if (mSingleUri != null) {
            mArrayUri = new ArrayList<>();
            mArrayUri.add(mSingleUri);
            mPagerPosition = 0;
        }

        options = new DisplayImageOptions.Builder()
                .showImageForEmptyUri(R.drawable.ic_default_image)
                .showImageOnFail(R.drawable.ic_default_image)
                .resetViewBeforeLoading(true)
                .cacheOnDisk(true)
                .imageScaleType(ImageScaleType.EXACTLY)
                .bitmapConfig(Bitmap.Config.RGB_565)
                .considerExifParams(true)
                .displayer(new FadeInBitmapDisplayer(300))
                .build();

        if (!isPrivate) {
            initPager();
        }

    }

    private void setPosDisplay(int position) {
        String pos = String.format("%d/%d", position + 1, mArrayUri.size());
        mMenuImagePos.setText(pos);
    }

    private void initPager() {
        adapter = new ImagePager(getSupportFragmentManager());
        pager.setAdapter(adapter);
        pager.setCurrentItem(mPagerPosition);
    }

    @Override
    public void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);
        outState.putInt(SAVE_INSTANCE_INDEX, pager.getCurrentItem());
    }

    @Override
    protected void onRestoreInstanceState(Bundle savedInstanceState) {
        super.onRestoreInstanceState(savedInstanceState);
        mPagerPosition = savedInstanceState.getInt(SAVE_INSTANCE_INDEX, mPagerPosition);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        if (needEdit) {
            MenuInflater menuInflater = getMenuInflater();
            menuInflater.inflate(R.menu.photo_pager, menu);
        }

        return super.onCreateOptionsMenu(menu);
    }

    @Override
    public void onBackPressed() {
        if (mDelUrls.isEmpty()) {
            setResult(RESULT_CANCELED);
        } else {
            Intent intent = new Intent();
            intent.putExtra("mDelUrls", mDelUrls);
            setResult(RESULT_OK, intent);
        }

        finish();
    }

    @OptionsItem
    protected final void action_del_maopao() {
        final int selectPos = pager.getCurrentItem();
        AlertDialog dialog = new AlertDialog.Builder(this)
                .setTitle("图片")
                .setMessage("确定删除？")
                .setPositiveButton("确定", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        String s = mArrayUri.remove(selectPos);
                        mDelUrls.add(s);
                        if (mArrayUri.isEmpty()) {
                            onBackPressed();
                        } else {
                            setPosDisplay(pager.getCurrentItem());
                            adapter.notifyDataSetChanged();
                        }
                    }
                })
                .setNegativeButton("取消", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {

                    }
                })
                .show();
    }

    class ImagePager extends FragmentStatePagerAdapter {

        public ImagePager(FragmentManager fm) {
            super(fm);
        }

        @Override
        public Fragment getItem(int i) {
            return ImagePagerFragment_.builder()
                    .uri(mArrayUri.get(i))
                    .customMenu(false)
                    .build();
        }

        @Override
        public Object instantiateItem(ViewGroup container, int position) {
            ImagePagerFragment fragment = (ImagePagerFragment) super.instantiateItem(container, position);
            fragment.setData(mArrayUri.get(position));
            return fragment;
        }

        @Override
        public int getItemPosition(Object object) {
            return POSITION_NONE;
        }

        @Override
        public int getCount() {
            return mArrayUri.size();
        }
    }
}