Android ListView數(shù)據(jù)的分批顯示功能
Android ListView數(shù)據(jù)的分批顯示
布局文件activity_call_safe2.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="vertical" >
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
>
<TextView
style="@style/TitleStyle"
android:text="黑名單管理"
/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:text="添加"
/>
</RelativeLayout>
<FrameLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="11"
>
<LinearLayout
android:id="@+id/ll_pb"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:visibility="invisible"
android:orientation="vertical"
>
<ProgressBar
android:layout_width="wrap_content"
android:layout_height="wrap_content"
/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="玩命加載中..."
/>
</LinearLayout>
<include
android:id="@+id/list_view_callsafe"
layout="@layout/list_view_callsafe"/>
</FrameLayout>
</LinearLayout>邏輯文件,實(shí)現(xiàn)頁面的分頁顯示,監(jiān)聽ListView的滑動事件,滑動的時(shí)候就更新數(shù)據(jù)
CasllSafeActivity.java
package com.ldw.safe.Activity;
import java.util.List;
import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.AbsListView;
import android.widget.AbsListView.OnScrollListener;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
import com.ldw.safe.R;
import com.ldw.safe.adapter.MyBaseAdapter;
import com.ldw.safe.bean.BlackNumberInfo;
import com.ldw.safe.db.dao.BlackNumberDao;
public class CallSafeActivity extends Activity {
private ListView list_view_callsafe;
private List<BlackNumberInfo> blackNumberInfos;
private LinearLayout ll_pb;
private BlackNumberDao dao;
private CallSafeAdapter adapter;
private int totalNumber;//總的條數(shù)
private int mStartIndex = 0;//開始加載的位置
private int maxCount = 20;//每頁加載多少數(shù)據(jù)
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_call_safe2);
initUi();
initData();
}
//初始化數(shù)據(jù)
private Handler handler = new Handler(){
@Override
public void handleMessage(Message msg) {
//數(shù)據(jù)初始化結(jié)束,關(guān)閉家在全的展示
ll_pb.setVisibility(View.INVISIBLE);
//防止適配器一直刷新
if(adapter == null){
adapter = new CallSafeAdapter(blackNumberInfos, CallSafeActivity.this);
//配置適配器
list_view_callsafe.setAdapter(adapter);
}else{
adapter.notifyDataSetChanged();
}
}
};
private EditText et_page_number;
//初始化數(shù)據(jù)
private void initData() {
//防止阻塞主線程,在子線程中初始化數(shù)據(jù)(后期數(shù)據(jù)會很多)
new Thread(){
@Override
public void run(){
dao = new BlackNumberDao(CallSafeActivity.this);
//一共有多少條數(shù)據(jù)
totalNumber = dao.getTotalNumber();
//分批加載數(shù)據(jù)
if(blackNumberInfos == null){
//第一次加載
blackNumberInfos = dao.findPar2(mStartIndex, maxCount);
}else{
//把后面的數(shù)據(jù)。追加到blackNumberInfos集合里面。防止黑名單被覆蓋
blackNumberInfos.addAll(dao.findPar2(mStartIndex, maxCount));
}
handler.sendEmptyMessage(0);
}
}.start();
}
//初始化UI
private void initUi() {
ll_pb = (LinearLayout) findViewById(R.id.ll_pb);
//初始化的時(shí)候展示加載的圓圈
ll_pb.setVisibility(View.VISIBLE);
list_view_callsafe = (ListView) findViewById(R.id.list_view_callsafe);
//設(shè)置listView的滾動監(jiān)聽器
list_view_callsafe.setOnScrollListener(new OnScrollListener(){
//狀態(tài)改變時(shí)候回調(diào)的方法
/*
* @param scrollState 表示滾動的狀態(tài)
*AbsListView.OnScrollListener.SCROLL_STATE_IDLE 閑置狀態(tài)
*AbsListView.OnScrollListener.SCROLL_STATE_TOUCH_SCROLL 手指觸摸的時(shí)候的狀態(tài)
*AbsListView.OnScrollListener.SCROLL_STATE_FLING 慣性
*/
@Override
public void onScrollStateChanged(AbsListView view, int scrollState) {
switch (scrollState) {
case AbsListView.OnScrollListener.SCROLL_STATE_IDLE:
//獲取到最后一條顯示的數(shù)據(jù)條數(shù)
int lastVisiblePosition = list_view_callsafe.getLastVisiblePosition();
System.out.println("lastVisiblePosition==========" + lastVisiblePosition);
if(lastVisiblePosition == blackNumberInfos.size() - 1){//判斷最后一個(gè)數(shù)據(jù)是不是每頁顯示的數(shù)據(jù)-1
// 加載更多的數(shù)據(jù)。 更改加載數(shù)據(jù)的開始位置
mStartIndex += maxCount;
if (mStartIndex >= totalNumber) {
Toast.makeText(getApplicationContext(),
"沒有更多的數(shù)據(jù)了。", Toast.LENGTH_SHORT).show();
return;
}
initData();
}
break;
}
}
//listview滾動的時(shí)候調(diào)用的方法
//時(shí)時(shí)調(diào)用。當(dāng)我們的手指觸摸的屏幕的時(shí)候就調(diào)用
@Override
public void onScroll(AbsListView view, int firstVisibleItem,
int visibleItemCount, int totalItemCount) {
// TODO Auto-generated method stub
}
});
}
//對代碼進(jìn)行優(yōu)化,繼承自定義MyBaseAdapter,MyBaseAdapter繼承自BaseAdapter封裝一些常用的方法
private class CallSafeAdapter extends MyBaseAdapter<BlackNumberInfo>{
private CallSafeAdapter(List lists, Context mContext){
super(lists, mContext);
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
//谷歌推出的優(yōu)化方案
ViewHolder holder;
if(convertView == null){
convertView = View.inflate(CallSafeActivity.this, R.layout.item_call_safe, null);
holder = new ViewHolder();
holder.tv_number = (TextView) convertView.findViewById(R.id.tv_number);
holder.tv_mode = (TextView) convertView.findViewById(R.id.tv_mode);
holder.iv_delete = (ImageView) convertView.findViewById(R.id.iv_delete);
convertView.setTag(holder);
}else{
holder = (ViewHolder) convertView.getTag();
}
holder.tv_number.setText(lists.get(position).getNumber());
String mode = lists.get(position).getMode();
if(mode.equals("1")){
holder.tv_mode.setText("電話和短信攔截");
}else if(mode.equals("2")){
holder.tv_mode.setText("電話攔截");
}else if(mode.equals("3")){
holder.tv_mode.setText("短信攔截");
}
final BlackNumberInfo info = lists.get(position);
//監(jiān)聽刪除數(shù)據(jù)按鈕,刪除數(shù)據(jù)
holder.iv_delete.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View v) {
String number = info.getNumber();
boolean result = dao.delete(number);
if(result){
Toast.makeText(CallSafeActivity.this, "刪除成功", Toast.LENGTH_SHORT).show();
lists.remove(info);
//更新ListView
adapter.notifyDataSetChanged();
}else{
Toast.makeText(CallSafeActivity.this, "刪除失敗", Toast.LENGTH_SHORT).show();
}
}
});
return convertView;
/*
//谷歌推出的優(yōu)化方案
ViewHolder holder;
if(convertView == null){
convertView = View.inflate(CallSafeActivity.this, R.layout.item_call_safe, null);
holder = new ViewHolder();
holder.tv_number = (TextView) convertView.findViewById(R.id.tv_number);
holder.tv_mode = (TextView) convertView.findViewById(R.id.tv_mode);
convertView.setTag(holder);
}else{
holder = (ViewHolder) convertView.getTag();
}
holder.tv_number.setText(blackNumberInfos.get(position).getNumber());
String mode = blackNumberInfos.get(position).getMode();
if(mode.equals("1")){
holder.tv_mode.setText("電話和短信攔截");
}else if(mode.equals("2")){
holder.tv_mode.setText("電話攔截");
}else if(mode.equals("3")){
holder.tv_mode.setText("短信攔截");
}
return convertView;
*/
/*初步的優(yōu)化
convertView = View.inflate(CallSafeActivity.this, R.layout.item_call_safe, null);
TextView tv_number = (TextView) convertView.findViewById(R.id.tv_number);
TextView tv_mode = (TextView) convertView.findViewById(R.id.tv_mode);
tv_number.setText(blackNumberInfos.get(position).getNumber());
String mode = blackNumberInfos.get(position).getMode();
if(mode.equals("1")){
tv_mode.setText("電話和短信攔截");
}else if(mode.equals("2")){
tv_mode.setText("電話攔截");
}else if(mode.equals("3")){
tv_mode.setText("短信攔截");
}
return convertView;
*/
/*傳統(tǒng)的方式
View view = View.inflate(CallSafeActivity.this, R.layout.item_call_safe, null);
TextView tv_number = (TextView) view.findViewById(R.id.tv_number);
TextView tv_mode = (TextView) view.findViewById(R.id.tv_mode);
tv_number.setText(blackNumberInfos.get(position).getNumber());
String mode = blackNumberInfos.get(position).getMode();
if(mode.equals("1")){
tv_mode.setText("電話和短信攔截");
}else if(mode.equals("2")){
tv_mode.setText("電話攔截");
}else if(mode.equals("3")){
tv_mode.setText("短信攔截");
}
return view;
*/
}
}
static class ViewHolder{
TextView tv_number;
TextView tv_mode;
ImageView iv_delete;
}
}
以上所述是小編給大家介紹的Android ListView數(shù)據(jù)的分批顯示功能,希望對大家有所幫助,如果大家有任何疑問歡迎給我留言,小編會及時(shí)回復(fù)大家的!
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