关于BaseAdapter的用法

来源：互联网发布：raspivid 源码编辑：程序博客网时间：2024/04/28 00:00

注意：本文代码做了两次测试，所以bean类和myadapter类不对称，但本文可提供语法格式，代码均亲测package com.example.administrator.daer_end;/** * Created by Administrator on 2017/2/25. */public class bean {    private String name;//    private int imagId;    private int type;    public static final int received=0;    public static final int send=1;    public bean(String name,int type) {        this.name = name;//        this.imagId = imagId;        this.type=type;    }    public String getName() {        return name;    }//    public int getImagId() {//        return imagId;//    }    public int getType(){        return type;    }}

package com.example.administrator.daer_end;import android.content.Context;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.BaseAdapter;import android.widget.LinearLayout;import android.widget.TextView;import java.util.List;/** * Created by Administrator on 2017/2/25. */public class myadapter extends BaseAdapter {    private LayoutInflater mlayoutInflater;    private List<bean>list;    public myadapter(Context context, List<bean> list) {        this.mlayoutInflater = LayoutInflater.from(context);        this.list = list;    }    @Override    public int getCount() {        return list.size();    }    @Override    public Object getItem(int position) {        return list.get(position);    }    @Override    public long getItemId(int position) {        return position;    }    @Override    public View getView(int position, View convertView, ViewGroup parent) {        viewHoder viewhoder=null;        if (convertView==null)        {            viewhoder=new viewHoder();            convertView=mlayoutInflater.inflate(R.layout.news,null);            viewhoder.leftLayout= (LinearLayout) convertView.findViewById(R.id.layout_left);            viewhoder.rightLayout= (LinearLayout) convertView.findViewById(R.id.layout_right);            viewhoder.right_news= (TextView) convertView.findViewById(R.id.right);            viewhoder.left_news= (TextView) convertView.findViewById(R.id.left);//            viewhoder.imageId= (ImageView) convertView.findViewById(R.id.image1);            convertView.setTag(viewhoder);        }        else {            viewhoder= (viewHoder) convertView.getTag();        }        bean go=list.get(position);        if (go.getType()==bean.received){            viewhoder.leftLayout.setVisibility(convertView.VISIBLE);            viewhoder.rightLayout.setVisibility(convertView.GONE);            viewhoder.left_news.setText(go.getName());        }//        viewhoder.imageId.setImageResource(go.getImagId());        else if (go.getType()==bean.send){            viewhoder.rightLayout.setVisibility(convertView.VISIBLE);            viewhoder.leftLayout.setVisibility(convertView.GONE);            viewhoder.right_news.setText(go.getName());        }        return convertView;    }    class viewHoder{        TextView left_news;        TextView right_news;//        ImageView imageId;        LinearLayout leftLayout;        LinearLayout rightLayout;    }}

package com.example.administrator.daer_end;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.View;import android.widget.Button;import android.widget.EditText;import android.widget.ListView;import java.util.ArrayList;import java.util.List;public class MainActivity extends AppCompatActivity {    private ListView listView;    private List<bean> list=new ArrayList<bean>();    private EditText inputText;    private myadapter adapter;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        listView= (ListView) findViewById(R.id.listview);        inputText= (EditText) findViewById(R.id.input_text);        Button button= (Button) findViewById(R.id.button);        adapter=new myadapter(MainActivity.this,list);        init();        listView.setAdapter(adapter);        button.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                String content=inputText.getText().toString();                if (!"".equals(content)){                    bean bea=new bean(content,bean.send);                    list.add(bea);                    adapter.notifyDataSetChanged();                    listView.setSelection(list.size());                    inputText.setText("");                }            }        });    }    private void init() {        bean one=new bean("你好啊",bean.received);        list.add(one);        bean two=new bean("你好，很高兴见到你",bean.send);        list.add(two);        bean three=new bean("最近过的怎么样",bean.received);        list.add(three);    }}

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