Android操作数据的动态更新ListView
16lz
2021-12-04
Android操作数据的动态更新ListView
你能猜想这是我四个按钮操作之后的效果图吗
布局文件：activity_main.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" tools:context=".MainActivity"> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="horizontal"> <Button android:id="@+id/btn_add" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="添加一条记录" /> <Button android:id="@+id/btn_add2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="往第五列插入一条数据" /> LinearLayout> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="horizontal"> <Button android:id="@+id/btn_remove" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="根据对象删除数据" /> <Button android:id="@+id/btn_remove2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="根据游标删除数据" /> LinearLayout> <ListView android:id="@+id/list_one" android:layout_width="match_parent" android:layout_height="wrap_content" /> <TextView android:id="@+id/txt_empty" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center" android:textColor="#000000" android:textSize="15pt" />LinearLayout>展示视图控制文件：MainActivity
package run.yang.com.listviewactivedemo;import android.content.Context;import android.os.Bundle;import android.support.v7.app.AppCompatActivity;import android.view.View;import android.widget.Button;import android.widget.ImageView;import android.widget.ListView;import android.widget.TextView;import java.util.LinkedList;import java.util.List;public class MainActivity extends AppCompatActivity implements View.OnClickListener{ private ListView list_one; private TextView txt_empty; private Button btn_add; private Button btn_add2; private Button btn_remove; private Button btn_remove2; private MyAdapter mAdapter = null; private List mData = null; private Context mContext = null; private int flag = 1; private Data mData_5 = null; //用来临时放对象的 @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); mContext = MainActivity.this; mData = new LinkedList(); mAdapter = new MyAdapter((LinkedList) mData,mContext); bindViews(); } private void bindViews(){ list_one = (ListView) findViewById(R.id.list_one); txt_empty = (TextView) findViewById(R.id.txt_empty); btn_add = (Button) findViewById(R.id.btn_add); btn_add2 = (Button) findViewById(R.id.btn_add2); btn_remove = (Button) findViewById(R.id.btn_remove); btn_remove2 = (Button) findViewById(R.id.btn_remove2); txt_empty.setText("暂无数据~"); list_one.setAdapter(mAdapter); list_one.setEmptyView(txt_empty); btn_add.setOnClickListener(this); btn_add2.setOnClickListener(this); btn_remove.setOnClickListener(this); btn_remove2.setOnClickListener(this); } private void updateListItem(int postion,Data mData){ int visiblePosition = list_one.getFirstVisiblePosition(); View v = list_one.getChildAt(postion - visiblePosition); ImageView img = (ImageView) v.findViewById(R.id.img_icon); TextView tv = (TextView) v.findViewById(R.id.txt_content); img.setImageResource(mData.getImgId()); tv.setText(mData.getContent()); } @Override public void onClick(View v) { switch (v.getId()){ case R.id.btn_add: if(flag == 5){ mData_5 = new Data(R.mipmap.ic_icon_qitao,"给政哥跪了~~~ x " + flag); mAdapter.add(mData_5); }else{ mAdapter.add(new Data(R.mipmap.ic_icon_qitao,"给政哥跪了~~~ x " + flag)); } flag++; break; case R.id.btn_add2: //position从0开始算的 mAdapter.add(4,new Data(R.mipmap.ic_icon_qitao,"给政哥跪了~~~ x " + flag)); break; case R.id.btn_remove: mAdapter.remove(mData_5); break; case R.id.btn_remove2: mAdapter.remove(2); break; } }}写个Data.java，大家不陌生吧
package run.yang.com.listviewactivedemo;/** * Created by yang_zzheng on 2016/7/14 * yangzhizheng2012@163.com */public class Data { private int imgId; private String content; public Data() {} public Data(int imgId, String content) { this.imgId = imgId; this.content = content; } public int getImgId() { return imgId; } public String getContent() { return content; } public void setImgId(int imgId) { this.imgId = imgId; } public void setContent(String content) { this.content = content; }}自定义的BaseAdapter—->MyAdapter.java
package run.yang.com.listviewactivedemo;import android.content.Context;import android.os.Bundle;import android.support.v7.app.AppCompatActivity;import android.view.View;import android.widget.Button;import android.widget.ImageView;import android.widget.ListView;import android.widget.TextView;import java.util.LinkedList;import java.util.List;public class MainActivity extends AppCompatActivity implements View.OnClickListener{ private ListView list_one; private TextView txt_empty; private Button btn_add; private Button btn_add2; private Button btn_remove; private Button btn_remove2; private MyAdapter mAdapter = null; private List mData = null; private Context mContext = null; private int flag = 1; private Data mData_5 = null; //用来临时放对象的 @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); mContext = MainActivity.this; mData = new LinkedList(); mAdapter = new MyAdapter((LinkedList) mData,mContext); bindViews(); } private void bindViews(){ list_one = (ListView) findViewById(R.id.list_one); txt_empty = (TextView) findViewById(R.id.txt_empty); btn_add = (Button) findViewById(R.id.btn_add); btn_add2 = (Button) findViewById(R.id.btn_add2); btn_remove = (Button) findViewById(R.id.btn_remove); btn_remove2 = (Button) findViewById(R.id.btn_remove2); txt_empty.setText("暂无数据~"); list_one.setAdapter(mAdapter); list_one.setEmptyView(txt_empty); btn_add.setOnClickListener(this); btn_add2.setOnClickListener(this); btn_remove.setOnClickListener(this); btn_remove2.setOnClickListener(this); } private void updateListItem(int postion,Data mData){ int visiblePosition = list_one.getFirstVisiblePosition(); View v = list_one.getChildAt(postion - visiblePosition); ImageView img = (ImageView) v.findViewById(R.id.img_icon); TextView tv = (TextView) v.findViewById(R.id.txt_content); img.setImageResource(mData.getImgId()); tv.setText(mData.getContent()); } @Override public void onClick(View v) { switch (v.getId()){ case R.id.btn_add: if(flag == 5){ mData_5 = new Data(R.mipmap.ic_icon_qitao,"给政哥跪了~~~ x " + flag); mAdapter.add(mData_5); }else{ mAdapter.add(new Data(R.mipmap.ic_icon_qitao,"给政哥跪了~~~ x " + flag)); } flag++; break; case R.id.btn_add2: //position从0开始算的 mAdapter.add(4,new Data(R.mipmap.ic_icon_qitao,"给政哥跪了~~~ x " + flag)); break; case R.id.btn_remove: mAdapter.remove(mData_5); break; case R.id.btn_remove2: mAdapter.remove(2); break; } }}当然少不了我们的列表项目布局item_list.xml
<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="horizontal"> <ImageView android:id="@+id/img_icon" android:layout_width="56dp" android:layout_height="56dp"/> <TextView android:id="@+id/txt_content" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginTop="20dp" android:layout_marginLeft="10dp" android:textSize="18sp" />LinearLayout>哈哈适配器也就需要这几个文件
本文参考文件：
http://blog.csdn.net/coder_pig/article/details/48631595
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