使用ListView和自定义Adapter完成列表信息

使用ListView和自定义Adapter完成列表信息显示

完成此项任务我们应该想象到在布局方面应该有三块需要做到：从大到小说起，1、显示此列表的主界面2、在主界面一行一行显示3、在一行上显示的格式

下面根据上面的想法完成以上三种页面布局

1、显示此列表主界面

<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:id="@+id/show"
    android:orientation="vertical">

</LinearLayout>

效果可以为：

2、在主界面上一行一行的显示

  <ListView
        android:id="@+id/list_view"
        android:layout_width="wrap_content"
        android:layout_height="385dp">

    </ListView>

效果可以为：

3、在一行上显示的格式

<ImageView
        android:id="@+id/img"
        android:src="@mipmap/ic_launcher"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />


        <TextView
            android:id="@+id/name"
            android:hint="@string/app_name"
            android:textSize="20sp"
            android:layout_width="match_parent"
            android:layout_height="wrap_content" />
        <TextView
            android:id="@+id/age"
            android:hint="@string/age"
            android:textSize="14sp"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" />
        <TextView
            android:id="@+id/email"
            android:hint="@string/email"
            android:textSize="14sp"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" />
        <TextView
            android:id="@+id/dizhi"
            android:hint="@string/dizhi"
            android:textSize="14sp"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" />

效果为：

java代码要有主Java程序和Fragment来加载数据

首先创一个AdapterFragment用来加载数据

public class AdapterFragment extends Fragment {
    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, Bundle savedInstanceState) {
        View view =inflater.inflate(R.layout.fragment_adapter,container,false);
        List<NameMessage> datas = new ArrayList<>();
        datas.add(new NameMessage(R.mipmap.ic_launcher,"蔡志坤","25","aa@11.cn","厦门市"));
        datas.add(new NameMessage(R.mipmap.ic_launcher,"李杰华","25","bb@22.cn","漳州市"));
       datas.add(new NameMessage(R.mipmap.ic_launcher,"张亮","25","cc@33.cn","厦门市"));
        datas.add(new NameMessage(R.mipmap.ic_launcher,"陈旭","25","dd@44.cn","厦门市"));
        datas.add(new NameMessage(R.mipmap.ic_launcher,"刘玄德","25","ee@55.cn","福州市"));

        MessageAsapter adapter = new MessageAsapter(getActivity(), datas);
        //将数据加载到listView
        ListView listView = (ListView) view.findViewById(R.id.list_view);
        listView.setAdapter(adapter);
        return view;
    }
}

为以上数据创建一个对象组

public class NameMessage {
    private String name;
    private String age;
    private String email;
    private String dizhi;
    private int imgId;

    public NameMessage( int imgId,String name, String age, String email, String dizhi) {
        this.name = name;
        this.age = age;
        this.email = email;
        this.dizhi = dizhi;
        this.imgId = imgId;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getAge() {
        return age;
    }

    public void setAge(String age) {
        this.age = age;
    }

    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    public String getDizhi() {
        return dizhi;
    }

    public void setDizhi(String dizhi) {
        this.dizhi = dizhi;
    }

    public int getImgId() {
        return imgId;
    }

    public void setImgId(int imgId) {
        this.imgId = imgId;
    }
}

获取数据中的每个控件对象以及为每个控件赋值

    private List<NameMessage> datas;
    private Context context;
    public MessageAsapter(Context context,List datas) {
        this.datas = datas;
        this.context = context;
    }
    @Override
    public int getCount() {
        return datas.size();
    }

    @Override
    public Object getItem(int i) {
        return datas.get(i);
    }

    @Override
    public long getItemId(int i) {
        return i;
    }

    @Override
    public View getView(int i, View view, ViewGroup viewGroup) {
        if(view == null){
            view = LayoutInflater.from(context).inflate(R.layout.item,null);
        }
        //2、获取View中的每个控件的对象
        ImageView img = (ImageView)view.findViewById(R.id.img);
        TextView name =(TextView) view.findViewById(R.id.name);
        TextView age = (TextView)view.findViewById(R.id.age);
        TextView email = (TextView)view.findViewById(R.id.email);
        TextView dizhi = (TextView)view.findViewById(R.id.dizhi);

        //3、给View中的每个控件赋值
        NameMessage namemessage = datas.get(i);
        img.setImageResource(namemessage.getImgId());
        name.setText(namemessage.getName());
        age.setText(namemessage.getAge());
        email.setText(namemessage.getEmail());
        dizhi.setText(namemessage.getDizhi());

        return view;
    }
}

主界面的Java程序显示

    public class ListViewActivity extends AppCompatActivity {
    private Fragment adapterFragment;
    private FragmentTransaction transction;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_list_view);
        FragmentManager manager = getFragmentManager() ;
        transction = manager.beginTransaction();
        if(adapterFragment ==null){
            adapterFragment = new AdapterFragment();
            transction.add(R.id.show,adapterFragment);
        }
        transction.replace(R.id.show,adapterFragment);
        transction.commit();
    }

最后的成品为：

在做这个的时候应该弄清楚逻辑，每个界面之间的关系，以及比例的分配，接着就是在Java代码中实现他需要做的，大概就可以解决了