好用的ListView adapter

最近在寫android程序，要常常用到BaseAdapter，用多了以爲很很差用，代碼不少冗餘。因而網上找個好的替代品，發現有一個叫作easy-adapter的庫，試用了下以爲很好用，這裏先記錄下來。把其中的源碼貼出來，稍微作些解釋。
先貼出要實現的效果: 

 

首先把ListView的item佈局貼出來：

<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>

其次要實現一個繼承自easy-adapter庫中的叫ItemViewHolder的類的ViewHolder,這個ViewHolder和item佈局文件對應,看代碼更容易懂，其中的Person類看後面代碼，而裏面的@LayoutId和@ViewId在庫中被解析,@LayoutId後跟佈局文件id,@ViewId後跟佈局文件中的view的id,這樣就將佈局文件中的view和ViewHolder中的成員直接綁定了:

//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類代碼以下：

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;
    }
}

而後在Activiy裏這樣用，其中的DataProvider是提供數據的，後面會列出代碼：

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.
         */
        //加上這一句就能夠了
        mListView.setAdapter(new EasyAdapter<Person>(this, PersonViewHolder.class, DataProvider.getListPeople()));
    }
}

DataProvider類的代碼：

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;
    }
}

這就是全部的代碼，很是清晰易懂，這只是一個簡單的例子，你能夠將EasyAdapter用於全部的listview裏,只需改變幾個文件，就能夠實現不一樣佈局的listview。