Android开发-Crimina

Posted 2020-10-09

这次我们做的是一个记录生活坏习惯的应用

这是他完成后的界面样子

首先我们创建一个fragment事务

if (fragment == null) {
?        fragment = new CrimeFragment();
?        fm.beginTransaction()
?             .add(R.id.fragment_container, fragment)
?             .commit();

 这是它的布局文件

<?xml version="1.0" encoding="utf-8"?>

<FrameLayout

xmlns:android="http://schemas.android.com/apk/res/android"

android:id="@+id/fragment_container"

android:layout_width="match_parent" android:layout_height="match_parent"/>

创建Crime类

public class Crime {
    private UUID mId;
    private String mTitle;
    private Date mDate;
    private boolean mSolved;

    public Crime() {
        mId = UUID.randomUUID();
        mDate = new Date();
    }

    public UUID getmId() {
        return mId;
    }

    public String getmTitle() {
        return mTitle;
    }

    public void setmTitle(String mTitle) {
        this.mTitle = mTitle;
    }

    public Date getmDate() {
        return mDate;
    }

    public void setmDate(Date mDate) {
        this.mDate = mDate;
    }

    public boolean ismSolved() {
        return mSolved;
    }

    public void setmSolved(boolean mSolved) {
        this.mSolved = mSolved;
    }


}

使用ViewPager

• 最后我们为UI添加Vi额为Pager，让用户可以左右滑动屏幕，切换查看不同列表项的明细页面

• 创建CrimePagerActivity

···
protected void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_crime_pager);}
···

-设置pager adapter

···
mViewPager = (ViewPager) findViewById(R.id.crime_view_pager);

    mCrimes = CrimeLab.get(this).getCrimes();
    FragmentManager fragmentManager = getSupportFragmentManager();
    mViewPager.setAdapter(new FragmentStatePagerAdapter(fragmentManager){

        @Override
        public Fragment getItem(int position){
            Crime crime = mCrimes.get(position);
            return CrimeFragment.newInstance(crime.getId());
        }

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