Android初学第32天

11_ViewPaper

代码

CrimePaperActivity.java

package com.bignerdranch.android.criminalintent;import android.content.Context;
import android.content.Intent;
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.AppCompatActivity;import java.util.List;
import java.util.UUID;public class CrimePagerActivity extends AppCompatActivity {private static final String EXTRA_CRIME_ID ="com.bignerdranch.android.criminalintent.crime_id";private ViewPager mViewPager;private List<Crime> mCrimes;public static Intent newIntent(Context packageContext, UUID crimeId) {Intent intent = new Intent(packageContext, CrimePagerActivity.class);intent.putExtra(EXTRA_CRIME_ID, crimeId);return intent;}@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_crime_pager);UUID crimeId = (UUID) getIntent().getSerializableExtra(EXTRA_CRIME_ID);mViewPager = (ViewPager) findViewById(R.id.crime_view_pager);mCrimes = CrimeLab.get(this).getCrimes();FragmentManager fragmentManager = getSupportFragmentManager();mViewPager.setAdapter(new FragmentStatePagerAdapter(fragmentManager) {@Overridepublic Fragment getItem(int position) {Crime crime = mCrimes.get(position);return CrimeFragment.newInstance(crime.getId());}@Overridepublic int getCount() {return mCrimes.size();}});for (int i = 0; i < mCrimes.size(); i++) {if (mCrimes.get(i).getId().equals(crimeId)) {mViewPager.setCurrentItem(i);break;}}}
}