本文介绍了一个Android应用中的黑名单管理功能实现，包括布局文件的设计、数据库操作逻辑及UI组件的交互。通过自定义适配器实现了数据的分页加载，并优化了ListView的滑动性能。
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="黑名单管理"
/>
<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="玩命加载中..."
/>
</LinearLayout>
<include
android:id="@+id/list_view_callsafe"
layout="@layout/list_view_callsafe"/>
</FrameLayout>
</LinearLayout>
BlackNumberDao.java黑名单数据库的逻辑文件
package com.ldw.safe.db.dao;
import java.util.ArrayList;
import java.util.List;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import com.ldw.safe.bean.BlackNumberInfo;
/*
* 黑名单数据库的逻辑文件
*/
public class BlackNumberDao {
private BlackNumberOpenHelper helper;
public BlackNumberDao(Context context){
helper = new BlackNumberOpenHelper(context);
}
//添加黑名单
//number黑名单号码，mode拦截模式,"blacknumber"是表名
public boolean add(String number, String mode){
SQLiteDatabase db = helper.getWritableDatabase();
ContentValues contentValues = new ContentValues();
contentValues.put("number", number);
contentValues.put("mode", mode);
long blacknumber = db.insert("blacknumber", null, contentValues);
if(blacknumber == -1){
//添加失败
return false;
}else{
return true;
}
}
//通过电话号码删除黑命单
//number电话号码,"blacknumber"是表名
public boolean delete(String number){
SQLiteDatabase db = helper.getWritableDatabase();
int rowNumber = db.delete("blacknumber", "number=?", new String[]{number});
if(rowNumber == 0){
//删除失败
return false;
}else{
return true;
}
}
//修改黑名单的模式
public boolean changeNumberMode(String number, String mode){
SQLiteDatabase db = helper.getWritableDatabase();
ContentValues contentValues = new ContentValues();
contentValues.put("mode", mode);
int rowNumber = db.update("blacknumber", contentValues, "number=?", new String[]{number});
if(rowNumber == 0){
//修改失败
return false;
}else{
return true;
}
}
//通过电话号码查找黑名单拦截模式
public String findNumber(String number){
String mode = "";
SQLiteDatabase db = helper.getWritableDatabase();
Cursor cursor = db.query("blacknumber", new String[]{"mode"}, "number=?", new String[]{number}, null, null, null);
//只需要查询一个
if(cursor.moveToNext()){
mode = cursor.getString(0);
}
cursor.close();
db.close();
return mode;
}
//查找出所有的黑名单
public List<BlackNumberInfo> findAll(){
SQLiteDatabase db = helper.getWritableDatabase();
List<BlackNumberInfo> blackNumberInfos = new ArrayList<BlackNumberInfo>();
Cursor cursor = db.query("blacknumber", new String[]{"number", "mode"}, null, null, null, null, null);
//查询所有的所有用while
while(cursor.moveToNext()){
BlackNumberInfo blackNumberInfo = new BlackNumberInfo();
blackNumberInfo.setNumber(cursor.getString(0));
blackNumberInfo.setMode(cursor.getString(1));
blackNumberInfos.add(blackNumberInfo);
}
cursor.close();
db.close();
return blackNumberInfos;
}
/*数据分页
* param pageNumber 表示当前是哪一页
* param pageSize 表示每一页有多少条数据
* return limit 表示限制当前有多少数据
* offset 表示跳过 从第几条开始
*/
public List<BlackNumberInfo> findPar(int pageNumber, int pageSize){
SQLiteDatabase db = helper.getWritableDatabase();
//分页查找数据
Cursor cursor = db.rawQuery("select number, mode from blacknumber limit ? offset ?",
new String[]{String.valueOf(pageSize),
String.valueOf(pageSize * pageNumber)});
ArrayList<BlackNumberInfo> blackNumberInfos = new ArrayList<BlackNumberInfo>();
while(cursor.moveToNext()){
BlackNumberInfo blackNumberInfo = new BlackNumberInfo();
blackNumberInfo.setNumber(cursor.getString(0));
blackNumberInfo.setMode(cursor.getString(1));
blackNumberInfos.add(blackNumberInfo);
}
cursor.close();
return blackNumberInfos;
}
/*
* 分批加载，网上拉的时候数据会自动加载
* startIndex 开始的位置
* maxCount 每页展示的最大的条目
*/
public List<BlackNumberInfo> findPar2(int startIndex, int maxCount) {
SQLiteDatabase db = helper.getReadableDatabase();
Cursor cursor = db.rawQuery("select number,mode from blacknumber limit ? offset ?", new String[]{String.valueOf(maxCount),
String.valueOf(startIndex)});
List<BlackNumberInfo> blackNumberInfos = new ArrayList<BlackNumberInfo>();
while (cursor.moveToNext()) {
BlackNumberInfo blackNumberInfo = new BlackNumberInfo();
blackNumberInfo.setMode(cursor.getString(1));
blackNumberInfo.setNumber(cursor.getString(0));
blackNumberInfos.add(blackNumberInfo);
}
cursor.close();
db.close();
return blackNumberInfos;
}
//获取总共有多少条数据
public int getTotalNumber(){
SQLiteDatabase db = helper.getReadableDatabase();
Cursor cursor = db.rawQuery("select count(*) from blacknumber", null);
cursor.moveToNext();
int count = cursor.getInt(0);
cursor.close();
db.close();
return count;
}
}
逻辑文件，实现页面的分页显示，监听ListView的滑动事件，滑动的时候就更新数据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;//总的条数
private int mStartIndex = 0;//开始加载的位置
private int maxCount = 20;//每页加载多少数据
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_call_safe2);
initUi();
initData();
}
//初始化数据
private Handler handler = new Handler(){
@Override
public void handleMessage(Message msg) {
//数据初始化结束，关闭家在全的展示
ll_pb.setVisibility(View.INVISIBLE);
//防止适配器一直刷新
if(adapter == null){
adapter = new CallSafeAdapter(blackNumberInfos, CallSafeActivity.this);
//配置适配器
list_view_callsafe.setAdapter(adapter);
}else{
adapter.notifyDataSetChanged();
}
}
};
private EditText et_page_number;
//初始化数据
private void initData() {
//防止阻塞主线程，在子线程中初始化数据（后期数据会很多）
new Thread(){
@Override
public void run(){
dao = new BlackNumberDao(CallSafeActivity.this);
//一共有多少条数据
totalNumber = dao.getTotalNumber();
//分批加载数据
if(blackNumberInfos == null){
//第一次加载
blackNumberInfos = dao.findPar2(mStartIndex, maxCount);
}else{
//把后面的数据。追加到blackNumberInfos集合里面。防止黑名单被覆盖
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);
//初始化的时候展示加载的圆圈
ll_pb.setVisibility(View.VISIBLE);
list_view_callsafe = (ListView) findViewById(R.id.list_view_callsafe);
//设置listView的滚动监听器
list_view_callsafe.setOnScrollListener(new OnScrollListener(){
//状态改变时候回调的方法
/*
* @param scrollState 表示滚动的状态
*AbsListView.OnScrollListener.SCROLL_STATE_IDLE 闲置状态
*AbsListView.OnScrollListener.SCROLL_STATE_TOUCH_SCROLL 手指触摸的时候的状态
*AbsListView.OnScrollListener.SCROLL_STATE_FLING 惯性
*/
@Override
public void onScrollStateChanged(AbsListView view, int scrollState) {
switch (scrollState) {
case AbsListView.OnScrollListener.SCROLL_STATE_IDLE:
//获取到最后一条显示的数据条数
int lastVisiblePosition = list_view_callsafe.getLastVisiblePosition();
System.out.println("lastVisiblePosition==========" + lastVisiblePosition);
if(lastVisiblePosition == blackNumberInfos.size() - 1){//判断最后一个数据是不是每页显示的数据-1
// 加载更多的数据。 更改加载数据的开始位置
mStartIndex += maxCount;
if (mStartIndex >= totalNumber) {
Toast.makeText(getApplicationContext(),
"没有更多的数据了。", Toast.LENGTH_SHORT).show();
return;
}
initData();
}
break;
}
}
//listview滚动的时候调用的方法
//时时调用。当我们的手指触摸的屏幕的时候就调用
@Override
public void onScroll(AbsListView view, int firstVisibleItem,
int visibleItemCount, int totalItemCount) {
// TODO Auto-generated method stub
}
});
}
//对代码进行优化，继承自定义MyBaseAdapter，MyBaseAdapter继承自BaseAdapter封装一些常用的方法
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) {
//谷歌推出的优化方案
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("电话和短信拦截");
}else if(mode.equals("2")){
holder.tv_mode.setText("电话拦截");
}else if(mode.equals("3")){
holder.tv_mode.setText("短信拦截");
}
final BlackNumberInfo info = lists.get(position);
//监听删除数据按钮，删除数据
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, "删除成功", Toast.LENGTH_SHORT).show();
lists.remove(info);
//更新ListView
adapter.notifyDataSetChanged();
}else{
Toast.makeText(CallSafeActivity.this, "删除失败", Toast.LENGTH_SHORT).show();
}
}
});
return convertView;
/*
//谷歌推出的优化方案
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("电话和短信拦截");
}else if(mode.equals("2")){
holder.tv_mode.setText("电话拦截");
}else if(mode.equals("3")){
holder.tv_mode.setText("短信拦截");
}
return convertView;
*/
/*初步的优化
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("电话和短信拦截");
}else if(mode.equals("2")){
tv_mode.setText("电话拦截");
}else if(mode.equals("3")){
tv_mode.setText("短信拦截");
}
return convertView;
*/
/*传统的方式
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("电话和短信拦截");
}else if(mode.equals("2")){
tv_mode.setText("电话拦截");
}else if(mode.equals("3")){
tv_mode.setText("短信拦截");
}
return view;
*/
}
}
static class ViewHolder{
TextView tv_number;
TextView tv_mode;
ImageView iv_delete;
}
}
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