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CrimeListFragment.java
29.04.2017
16:00
Раздел: Android - books - AndroidProgramming2e - 14 Базы данных SQLite
CrimeListFragment.java

CrimeListFragment.java

package com.bignerdranch.android.criminalintent; 
 
import android.content.Intent; 
import android.os.Bundle; 
import android.support.v4.app.Fragment; 
import android.support.v7.app.AppCompatActivity; 
import android.support.v7.widget.LinearLayoutManager; 
import android.support.v7.widget.RecyclerView; 
import android.view.LayoutInflater; 
import android.view.Menu; 
import android.view.MenuInflater; 
import android.view.MenuItem; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.CheckBox; 
import android.widget.TextView; 
 
import java.util.List; 
 
public class CrimeListFragment extends Fragment { 
 
    private static final String SAVED_SUBTITLE_VISIBLE = "subtitle"; 
 
    private RecyclerView mCrimeRecyclerView; 
    private CrimeAdapter mAdapter; 
    private boolean mSubtitleVisible; 
 
    @Override 
    public void onCreate(Bundle savedInstanceState) { 
        super.onCreate(savedInstanceState); 
        setHasOptionsMenu(true); 
    } 
 
    @Override 
    public View onCreateView(LayoutInflater inflater, ViewGroup container, 
                             Bundle savedInstanceState) { 
        View view = inflater.inflate(R.layout.fragment_crime_list, container, false); 
 
        mCrimeRecyclerView = (RecyclerView) view 
                .findViewById(R.id.crime_recycler_view); 
        mCrimeRecyclerView.setLayoutManager(new LinearLayoutManager(getActivity())); 
 
        if (savedInstanceState != null) { 
            mSubtitleVisible = savedInstanceState.getBoolean(SAVED_SUBTITLE_VISIBLE); 
        } 
 
        updateUI(); 
 
        return view; 
    } 
 
    @Override 
    public void onResume() { 
        super.onResume(); 
        updateUI(); 
    } 
 
    @Override 
    public void onSaveInstanceState(Bundle outState) { 
        super.onSaveInstanceState(outState); 
        outState.putBoolean(SAVED_SUBTITLE_VISIBLE, mSubtitleVisible); 
    } 
 
    @Override 
    public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) { 
        super.onCreateOptionsMenu(menu, inflater); 
        inflater.inflate(R.menu.fragment_crime_list, menu); 
 
        MenuItem subtitleItem = menu.findItem(R.id.menu_item_show_subtitle); 
        if (mSubtitleVisible) { 
            subtitleItem.setTitle(R.string.hide_subtitle); 
        } else { 
            subtitleItem.setTitle(R.string.show_subtitle); 
        } 
    } 
 
    @Override 
    public boolean onOptionsItemSelected(MenuItem item) { 
        switch (item.getItemId()) { 
            case R.id.menu_item_new_crime: 
                Crime crime = new Crime(); 
                CrimeLab.get(getActivity()).addCrime(crime); 
                Intent intent = CrimePagerActivity 
                        .newIntent(getActivity(), crime.getId()); 
                startActivity(intent); 
                return true; 
            case R.id.menu_item_show_subtitle: 
                mSubtitleVisible = !mSubtitleVisible; 
                getActivity().invalidateOptionsMenu(); 
                updateSubtitle(); 
                return true; 
            default: 
                return super.onOptionsItemSelected(item); 
        } 
    } 
 
    private void updateSubtitle() { 
        CrimeLab crimeLab = CrimeLab.get(getActivity()); 
        int crimeCount = crimeLab.getCrimes().size(); 
        String subtitle = getString(R.string.subtitle_format, crimeCount); 
 
        if (!mSubtitleVisible) { 
            subtitle = null; 
        } 
 
        AppCompatActivity activity = (AppCompatActivity) getActivity(); 
        activity.getSupportActionBar().setSubtitle(subtitle); 
    } 
 
    private void updateUI() { 
        CrimeLab crimeLab = CrimeLab.get(getActivity()); 
        List<Crime> crimes = crimeLab.getCrimes(); 
 
        if (mAdapter == null) { 
            mAdapter = new CrimeAdapter(crimes); 
            mCrimeRecyclerView.setAdapter(mAdapter); 
        } else { 
            mAdapter.setCrimes(crimes); 
            mAdapter.notifyDataSetChanged(); 
        } 
 
        updateSubtitle(); 
    } 
 
    private class CrimeHolder extends RecyclerView.ViewHolder  
            implements View.OnClickListener { 
 
        private TextView mTitleTextView; 
        private TextView mDateTextView; 
        private CheckBox mSolvedCheckBox; 
 
        private Crime mCrime; 
 
        public CrimeHolder(View itemView) { 
            super(itemView); 
            itemView.setOnClickListener(this); 
 
            mTitleTextView = (TextView) itemView.findViewById(R.id.list_item_crime_title_text_view); 
            mDateTextView = (TextView) itemView.findViewById(R.id.list_item_crime_date_text_view); 
            mSolvedCheckBox = (CheckBox) itemView.findViewById(R.id.list_item_crime_solved_check_box); 
        } 
 
        public void bindCrime(Crime crime) { 
            mCrime = crime; 
            mTitleTextView.setText(mCrime.getTitle()); 
            mDateTextView.setText(mCrime.getDate().toString()); 
            mSolvedCheckBox.setChecked(mCrime.isSolved()); 
        } 
 
        @Override 
        public void onClick(View v) { 
            Intent intent = CrimePagerActivity.newIntent(getActivity(), mCrime.getId()); 
            startActivity(intent); 
        } 
    } 
 
    private class CrimeAdapter extends RecyclerView.Adapter<CrimeHolder> { 
 
        private List<Crime> mCrimes; 
 
        public CrimeAdapter(List<Crime> crimes) { 
            mCrimes = crimes; 
        } 
 
        @Override 
        public CrimeHolder onCreateViewHolder(ViewGroup parent, int viewType) { 
            LayoutInflater layoutInflater = LayoutInflater.from(getActivity()); 
            View view = layoutInflater.inflate(R.layout.list_item_crime, parent, false); 
            return new CrimeHolder(view); 
        } 
 
        @Override 
        public void onBindViewHolder(CrimeHolder holder, int position) { 
            Crime crime = mCrimes.get(position); 
            holder.bindCrime(crime); 
        } 
 
        @Override 
        public int getItemCount() { 
            return mCrimes.size(); 
        } 
 
        public void setCrimes(List<Crime> crimes) { 
            mCrimes = crimes; 
        } 
    } 
} 

 
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