android：DataBinding使用小结（二）

DataBinding在listview中的使用

• xml布局（这里以GridView为例）

<?xml version="1.0" encoding="utf-8"?>
<layout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools">

    <FrameLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        tools:context="tsou.cn.databinding.DynamicActivity">

        <GridView
            android:id="@+id/gridView"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:numColumns="3" />

    </FrameLayout>
</layout>

• 构建Adapter

package tsou.cn.databinding.adapter;

import android.content.Context;
import android.databinding.DataBindingUtil;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;

import java.util.ArrayList;
import java.util.List;

import tsou.cn.databinding.BR;
import tsou.cn.databinding.R;
import tsou.cn.databinding.databinding.ItemmBinding;

/**
 * Created by 黄家三少 on 2018/5/30.
 */

public class MMyAdapter extends BaseAdapter{
    private LayoutInflater inflater;
    private List<String> mlist;
    public View.OnClickListener itemClickListener;
    private ItemmBinding binding;

    public MMyAdapter(Context context) {
        inflater = LayoutInflater.from(context);
        mlist = new ArrayList<String>();
        for (int i = 0; i < 100; i++) {
            mlist.add(i, "item" + i);
        }
    }
    @Override
    public int getCount() {
        return mlist == null ? 0 : mlist.size();
    }

    @Override
    public Object getItem(int position) {
        return mlist.get(position);
    }

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

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        if (convertView == null) {
            binding = DataBindingUtil.inflate(inflater, R.layout.itemm, parent, false);
            convertView = binding.getRoot();
            convertView.setTag(binding);
        } else {
            binding = (ItemmBinding) convertView.getTag();
        }
        binding.setVariable(BR.item, mlist.get(position));
        binding.setMyAdapter(this);
        return convertView;
    }
    public void setOnclickListener(View.OnClickListener itemClickListener) {
        this.itemClickListener = itemClickListener;
    }
}

• item布局

<?xml version="1.0" encoding="utf-8"?>
<layout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto">

    <data>
        <variable
            name="item"
            type="String" />
        <variable
            name="myAdapter"
            type="tsou.cn.databinding.adapter.MMyAdapter" />
    </data>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical">

        <TextView
            android:id="@+id/textView"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:clickable="true"
            app:text="@{item}"
            app:onClickListener="@{myAdapter.itemClickListener}"/>
    </LinearLayout>
</layout>

• activity中调用

package tsou.cn.databinding;

import android.databinding.DataBindingUtil;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Toast;

import tsou.cn.databinding.adapter.MMyAdapter;
import tsou.cn.databinding.databinding.ActivityDynamicBinding;

public class DynamicActivity extends AppCompatActivity implements View.OnClickListener {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        ActivityDynamicBinding binding = DataBindingUtil.setContentView(this, R.layout.activity_dynamic);
        MMyAdapter adapter = new MMyAdapter(getBaseContext());
        adapter.setOnclickListener(this);
        binding.gridView.setAdapter(adapter);
    }

    @Override
    public void onClick(View v) {
        Toast.makeText(getBaseContext(), v.getClass().getSimpleName(), Toast.LENGTH_SHORT).show();
    }
}

• 效果

Demo地址：https://download.csdn.net/download/huangxiaoguo1/10454497