好用的ListView adapter

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最近在写android程序，要经常用到BaseAdapter，用多了觉得很不好用，代码很多冗余。于是网上找个好的替代品，发现有一个叫做easy-adapter的库，试用了下觉得很好用，这里先记录下来。把其中的源码贴出来，稍微做些解释。
先贴出要实现的效果: 

 

首先把ListView的item布局贴出来：

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

    android:layout_height="wrap_content"

    android:layout_width="match_parent">

    <ImageView

        android:id="@+id/image_view_person"

        android:layout_width="80dp"

        android:layout_height="80dp"

        android:scaleType="centerCrop" />

    <TextView

        android:id="@+id/text_view_name"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_toRightOf="@id/image_view_person"

        android:paddingTop="10dp"

        android:paddingRight="10dp"

        android:paddingLeft="10dp"

        android:textSize="20sp" />

    <TextView

        android:id="@+id/text_view_phone"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_toRightOf="@id/image_view_person"

        android:layout_below="@id/text_view_name"

        android:layout_marginLeft="10dp"

        android:textSize="16sp"

        android:textColor="#0099cc" />

</RelativeLayout>

其次要实现一个继承自easy-adapter库中的叫ItemViewHolder的类的ViewHolder,这个ViewHolder和item布局文件对应,看代码更容易懂，其中的Person类看后面代码，而里面的@LayoutId和@ViewId在库中被解析,@LayoutId后跟布局文件id,@ViewId后跟布局文件中的view的id,这样就将布局文件中的view和ViewHolder中的成员直接绑定了:

//Annotate the class with the layout ID of the item.

@LayoutId(R.layout.person_item_layout)

public class PersonViewHolder extends ItemViewHolder<Person> {

    //Annotate every field with the ID of the view in the layout.

    //The views will automatically be assigned to the fields.

    @ViewId(R.id.image_view_person)

    ImageView imageViewPerson;

    @ViewId(R.id.text_view_name)

    TextView textViewName;

    @ViewId(R.id.text_view_phone)

    TextView textViewPhone;

    //Extend ItemViewHolder and call super(view)

    public PersonViewHolder(View view) {

        super(view);

    }

    //Override onSetValues() to set the values of the items in the views.

    @Override

    public void onSetValues(Person person, PositionInfo positionInfo) {

        imageViewPerson.setImageResource(person.getResDrawableId());

        textViewName.setText(person.getName());

        textViewPhone.setText(person.getPhoneNumber());

    }

    //Optionally override onSetListeners to add listeners to the views.

    @Override

    public void onSetListeners(final Person item, PositionInfo positionInfo) {

        imageViewPerson.setOnClickListener(new View.OnClickListener() {

            @Override

            public void onClick(View v) {

                Toast.makeText(getContext(), getContext().getString(R.string.my_name_string, item.getName()), Toast.LENGTH_LONG).show();

            }

        });

    }

}

上面的Person类代码如下：

public class Person {

    private String name;

    private String phoneNumber;

    private int resDrawableId;

    public Person() {

    }

    public Person(String name, String phoneNumber, int resDrawableId) {

        this.name = name;

        this.phoneNumber = phoneNumber;

        this.resDrawableId = resDrawableId;

    }

    public String getName() {

        return name;

    }

    public void setName(String name) {

        this.name = name;

    }

    public String getPhoneNumber() {

        return phoneNumber;

    }

    public void setPhoneNumber(String phoneNumber) {

        this.phoneNumber = phoneNumber;

    }

    public int getResDrawableId() {

        return resDrawableId;

    }

    public void setResDrawableId(int resDrawableId) {

        this.resDrawableId = resDrawableId;

    }

}

然后在Activiy里这样用，其中的DataProvider是提供数据的，后面会列出代码：

public class MainActivity extends Activity {

    ListView mListView;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        mListView = (ListView) findViewById(R.id.list_view);

        /*

          Simply create an EasyAdapter by passing a Context, your ItemViewHolder class and the list of items.

          Alternatively, you can create an EasyAdapter only with a Context and an ItemViewHolder class and set

          the list of items later.

         */

        //加上这一句就可以了

        mListView.setAdapter(new EasyAdapter<Person>(this, PersonViewHolder.class, DataProvider.getListPeople()));

    }

}

DataProvider类的代码：

public class DataProvider {

    //Returns a mock List of Person objects

    public static List<Person> getListPeople() {

        List<Person> listPeople = new ArrayList<Person>();

        listPeople.add(new Person("Henry Blair", "07123456789", R.drawable.male1));

        listPeople.add(new Person("Jenny Curtis", "07123456789", R.drawable.female1));

        listPeople.add(new Person("Vincent Green", "07123456789", R.drawable.male2));

        listPeople.add(new Person("Ada Underwood", "07123456789", R.drawable.female2));

        listPeople.add(new Person("Daniel Erickson", "07123456789", R.drawable.male3));

        listPeople.add(new Person("Maria Ramsey", "07123456789", R.drawable.female3));

        listPeople.add(new Person("Rosemary Munoz", "07123456789", R.drawable.female4));

        listPeople.add(new Person("John Singleton", "07123456789", R.drawable.male4));

        listPeople.add(new Person("Lorena Bowen", "07123456789", R.drawable.female5));

        listPeople.add(new Person("Kevin Stokes", "07123456789", R.drawable.male5));

        listPeople.add(new Person("Johnny Sanders", "07123456789", R.drawable.male6));

        listPeople.add(new Person("Jim Ramirez", "07123456789", R.drawable.male7));

        listPeople.add(new Person("Cassandra Hunter", "07123456789", R.drawable.female6));

        listPeople.add(new Person("Viola Guerrero", "07123456789", R.drawable.female7));

        return listPeople;

    }

}

这就是所有的代码，非常清晰易懂，这只是一个简单的例子，你可以将EasyAdapter用于所有的listview里,只需改变几个文件，就可以实现不同布局的listview。

转载于:https://my.oschina.net/u/1537391/blog/278907