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package com.idormy.sms.forwarder.adapter;
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import android.content.Context;
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import android.view.LayoutInflater;
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import android.view.View;
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import android.view.ViewGroup;
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import android.widget.ArrayAdapter;
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import android.widget.ImageView;
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import android.widget.TextView;
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import com.idormy.sms.forwarder.R;
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import com.idormy.sms.forwarder.model.vo.LogVo;
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import java.util.List;
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public class LogAdapter extends ArrayAdapter<LogVo> {
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private int resourceId;
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private List<LogVo> list;
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// 适配器的构造函数,把要适配的数据传入这里
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public LogAdapter(Context context, int textViewResourceId, List<LogVo> objects) {
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super(context, textViewResourceId, objects);
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resourceId = textViewResourceId;
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list = objects;
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}
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@Override
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public int getCount() {
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return list.size();
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}
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@Override
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public LogVo getItem(int position) {
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return list.get(position);
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}
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@Override
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public long getItemId(int position) {
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return 0;
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}
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// convertView 参数用于将之前加载好的布局进行缓存
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@Override
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public View getView(int position, View convertView, ViewGroup parent) {
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LogVo logVo = getItem(position); //获取当前项的TLog实例
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// 加个判断,以免ListView每次滚动时都要重新加载布局,以提高运行效率
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View view;
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ViewHolder viewHolder;
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if (convertView == null) {
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// 避免ListView每次滚动时都要重新加载布局,以提高运行效率
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view = LayoutInflater.from(getContext()).inflate(resourceId, parent, false);
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// 避免每次调用getView()时都要重新获取控件实例
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viewHolder = new ViewHolder();
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viewHolder.tLogFrom = view.findViewById(R.id.tlog_from);
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viewHolder.tLogContent = view.findViewById(R.id.tlog_content);
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viewHolder.tLogRule = view.findViewById(R.id.tlog_rule);
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viewHolder.senderImage = view.findViewById(R.id.tlog_sender_image);
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// 将ViewHolder存储在View中(即将控件的实例存储在其中)
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view.setTag(viewHolder);
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} else {
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view = convertView;
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viewHolder = (ViewHolder) view.getTag();
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}
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// 获取控件实例,并调用set...方法使其显示出来
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if (logVo != null) {
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viewHolder.tLogFrom.setText(logVo.getFrom());
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viewHolder.tLogContent.setText(logVo.getContent());
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viewHolder.tLogRule.setText(logVo.getRule());
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viewHolder.senderImage.setImageResource(logVo.getSenderImageId());
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}
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return view;
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}
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public void add(List<LogVo> logVos) {
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if (list != null) {
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list = logVos;
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notifyDataSetChanged();
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}
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}
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public void del(List<LogVo> logVos) {
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if (list != null) {
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list = logVos;
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notifyDataSetChanged();
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}
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}
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public void update(List<LogVo> logVos) {
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if (list != null) {
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list = logVos;
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notifyDataSetChanged();
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}
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}
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public void onDateChange(List<LogVo> logVos) {
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list = logVos;
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notifyDataSetChanged();
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}
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// 定义一个内部类,用于对控件的实例进行缓存
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class ViewHolder {
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TextView tLogFrom;
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TextView tLogContent;
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TextView tLogRule;
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ImageView senderImage;
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}
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} |