android ListView GridView 单选和复选列子
16lz
2021-01-24
android ListView GridView 单选和复选列子
1.看到论坛有 同学不会写 listview item 的单选和 复选 所以写了一个发出来 单选类（SignChooseActivity）
package com.zhx.listdemo;import java.util.ArrayList;import java.util.List;import android.app.Activity;import android.os.Bundle;import android.view.Menu;import android.view.MenuItem;import android.widget.ListView;public class SignChooseActivity extends Activity { private ListView mListView; private TextAdapter mAdapter; private List mList = new ArrayList(); @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_sign); mListView = (ListView) findViewById(R.id.text_listview); for (int i = 0; i < 20; i++) { mList.add("去约车" + i); } mAdapter = new TextAdapter(mList, this); mListView.setAdapter(mAdapter); }} 2.单选适配器
package com.zhx.listdemo;import java.util.HashMap;import java.util.List;import java.util.Map;import android.app.Activity;import android.util.Log;import android.view.View;import android.view.View.OnClickListener;import android.view.ViewGroup;import android.widget.BaseAdapter;import android.widget.CheckBox;import android.widget.ImageView;import android.widget.TextView;public class TextAdapter extends BaseAdapter { private List list; private Activity activity; private Map isSelectedMap = new HashMap(); public TextAdapter(List list, Activity activity) { super(); this.list = list; this.activity = activity; for (int i = 0; i < list.size(); i++) { isSelectedMap.put(i + "", false); } } @Override public int getCount() { // TODO Auto-generated method stub return list == null ? 0 : list.size(); } @Override public Object getItem(int position) { // TODO Auto-generated method stub return position; } @Override public long getItemId(int position) { // TODO Auto-generated method stub return position; } @Override public View getView(final int position, View convertView, ViewGroup parent) { // TODO Auto-generated method stub ViewHolder holder = null; if (convertView == null) { holder = new ViewHolder(); convertView = activity.getLayoutInflater().inflate( R.layout.test_item, null); holder.tv = (TextView) convertView.findViewById(R.id.test_tv); holder.box = (ImageView) convertView .findViewById(R.id.test_check_box); convertView.setTag(holder); } else { holder = (ViewHolder) convertView.getTag(); } convertView.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { // TODO Auto-generated method stub for (int i = 0; i < list.size(); i++) { if (i == position) { Log.i("点击项目", position + ""); isSelectedMap.put(i + "", true); } else { Log.i("未点击项目", position + ""); isSelectedMap.put(i + "", false); } } notifyDataSetChanged(); } }); Log.i("选中项", position + "@" + isSelectedMap.get(position + "") + ""); if (isSelectedMap.get(position + "")) { holder.box.setImageResource(R.drawable.multi_select_flag); } else { holder.box.setImageResource(R.drawable.ic_launcher); } holder.tv.setText(list.get(position)); return convertView; } class ViewHolder { TextView tv; ImageView box; }}package com.zhx.listdemo;import java.util.HashMap;import java.util.List;import java.util.Map;import android.app.Activity;import android.util.Log;import android.view.View;import android.view.View.OnClickListener;import android.view.ViewGroup;import android.widget.BaseAdapter;import android.widget.CheckBox;import android.widget.ImageView;import android.widget.TextView;public class TextAdapter extends BaseAdapter { private List list; private Activity activity; private Map isSelectedMap = new HashMap(); public TextAdapter(List list, Activity activity) { super(); this.list = list; this.activity = activity; for (int i = 0; i < list.size(); i++) { isSelectedMap.put(i + "", false); } } @Override public int getCount() { // TODO Auto-generated method stub return list == null ? 0 : list.size(); } @Override public Object getItem(int position) { // TODO Auto-generated method stub return position; } @Override public long getItemId(int position) { // TODO Auto-generated method stub return position; } @Override public View getView(final int position, View convertView, ViewGroup parent) { // TODO Auto-generated method stub ViewHolder holder = null; if (convertView == null) { holder = new ViewHolder(); convertView = activity.getLayoutInflater().inflate( R.layout.test_item, null); holder.tv = (TextView) convertView.findViewById(R.id.test_tv); holder.box = (ImageView) convertView .findViewById(R.id.test_check_box); convertView.setTag(holder); } else { holder = (ViewHolder) convertView.getTag(); } convertView.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { // TODO Auto-generated method stub for (int i = 0; i < list.size(); i++) { if (i == position) { Log.i("点击项目", position + ""); isSelectedMap.put(i + "", true); } else { Log.i("未点击项目", position + ""); isSelectedMap.put(i + "", false); } } notifyDataSetChanged(); } }); Log.i("选中项", position + "@" + isSelectedMap.get(position + "") + ""); if (isSelectedMap.get(position + "")) { holder.box.setImageResource(R.drawable.multi_select_flag); } else { holder.box.setImageResource(R.drawable.ic_launcher); } holder.tv.setText(list.get(position)); return convertView; } class ViewHolder { TextView tv; ImageView box; }} 3.单选用的是listview 复选用gridview 做例子 其实一样的换个名字就好了 (MultChooseActivity)
package com.zhx.listdemo;import java.util.ArrayList;import java.util.List;import android.app.Activity;import android.graphics.BitmapFactory;import android.os.Bundle;import android.util.TypedValue;import android.view.LayoutInflater;import android.view.View;import android.view.View.OnClickListener;import android.view.ViewGroup;import android.widget.AdapterView;import android.widget.AdapterView.OnItemClickListener;import android.widget.BaseAdapter;import android.widget.Button;import android.widget.GridView;import android.widget.ImageView;import android.widget.RelativeLayout.LayoutParams;import android.widget.TextView;public class MultChooseActivity extends Activity { private Button mBack; private Button mAll; private GridView mDisplay; private TextView mCount; private AlbumAdapter mAdapter; private List mSelect = new ArrayList();// 存放当前用户选择的图片的编号 private int imagesId[] = { R.drawable.ic_launcher, R.drawable.ic_launcher, R.drawable.ic_launcher, R.drawable.ic_launcher, R.drawable.ic_launcher, R.drawable.ic_launcher, R.drawable.ic_launcher, R.drawable.ic_launcher, R.drawable.ic_launcher, R.drawable.ic_launcher, R.drawable.ic_launcher, R.drawable.ic_launcher, R.drawable.ic_launcher, R.drawable.ic_launcher, R.drawable.ic_launcher, R.drawable.ic_launcher, R.drawable.ic_launcher, R.drawable.ic_launcher,R.drawable.ic_launcher, R.drawable.ic_launcher, R.drawable.ic_launcher, R.drawable.ic_launcher, R.drawable.ic_launcher, R.drawable.ic_launcher, R.drawable.ic_launcher, R.drawable.ic_launcher, R.drawable.ic_launcher,R.drawable.ic_launcher, R.drawable.ic_launcher, R.drawable.ic_launcher, R.drawable.ic_launcher, R.drawable.ic_launcher, R.drawable.ic_launcher, R.drawable.ic_launcher, R.drawable.ic_launcher, R.drawable.ic_launcher,R.drawable.ic_launcher, R.drawable.ic_launcher }; protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.album_activity); findViewById(); setListener(); init(); } private void findViewById() { mBack = (Button) findViewById(R.id.album_back); mAll = (Button) findViewById(R.id.album_all); mDisplay = (GridView) findViewById(R.id.album_display); mCount = (TextView) findViewById(R.id.album_count); } private void setListener() { mBack.setOnClickListener(new OnClickListener() { public void onClick(View v) { // 关闭当前界面 finish(); } }); mAll.setOnClickListener(new OnClickListener() { public void onClick(View v) { if (mSelect.size() == imagesId.length) { // 全部选中时,点击为反选,所以清空 mSelect.clear(); } else if (mSelect.size() > 0) { // 当已选中时,点击为全选,添加没选择中的 for (int i = 0; i < imagesId.length; i++) { if (mSelect.contains(String.valueOf(i))) { continue; } mSelect.add(String.valueOf(i)); } } else { // 没选中,点击为全选,添加所有 for (int i = 0; i < imagesId.length; i++) { mSelect.add(String.valueOf(i)); } } // 如果全部选中则显示反选,否则显示全选 if (mSelect.size() == imagesId.length) { mAll.setText("反选"); } else { mAll.setText("全选"); } // 更新界面显示数量内容 initCount(mSelect.size()); // 刷新界面 mAdapter.notifyDataSetChanged(); } }); mDisplay.setOnItemClickListener(new OnItemClickListener() { public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) { // 查看当前点击的条目是否已经选中,选中则移出,没选中则删除 if (mSelect.contains(String.valueOf(arg2))) { mSelect.remove(String.valueOf(arg2)); } else { mSelect.add(String.valueOf(arg2)); } // 如果全部选中则显示反选,否则显示全选 if (mSelect.size() == imagesId.length) { mAll.setText("反选"); } else { mAll.setText("全选"); } // 更新界面显示数量内容 initCount(mSelect.size()); // 刷新界面 mAdapter.notifyDataSetChanged(); } }); } private void init() { // 更新界面显示数量内容 initCount(mSelect.size()); // 初始化适配器 mAdapter = new AlbumAdapter(); // 添加适配器 mDisplay.setAdapter(mAdapter); } /** * 更新界面显示数量内容 * * @param count * 选中的图片数量 */ private void initCount(int count) { // 更新选择的图片数量,如果数量大于0,设置确定按钮为可用,反之不可用并修改字体颜色 if (count > 0) { mCount.setText("已选择" + count + "张"); mCount.setTextColor(0xFFFFFFFF); } else { mCount.setText("已选择0张"); mCount.setTextColor(0xFF999999); } } private class AlbumAdapter extends BaseAdapter { public int getCount() { return imagesId.length; } public Object getItem(int position) { return null; } public long getItemId(int position) { return position; } public View getView(int position, View convertView, ViewGroup parent) { ViewHolder holder = null; if (convertView == null) { convertView = LayoutInflater.from(MultChooseActivity.this).inflate(R.layout.album_activity_item, null); holder = new ViewHolder(); holder.photo = (ImageView) convertView.findViewById(R.id.album_item_photo); holder.select = (ImageView) convertView.findViewById(R.id.album_item_select); // padding大小为40dip,计算px值 int padding = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 40, MultChooseActivity.this .getResources().getDisplayMetrics()); // 设置显示的图片大小为屏幕宽度1/4大小 LayoutParams params = new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT); params.width = (480 - padding) / 4; params.height = (480 - padding) / 4; holder.photo.setLayoutParams(params); holder.select.setLayoutParams(params); convertView.setTag(holder); } else { holder = (ViewHolder) convertView.getTag(); } // 添加图片 holder.photo.setImageBitmap(BitmapFactory.decodeResource(getResources(), imagesId[position])); // 查看是否选中,选中则显示选中效果 if (mSelect.contains(String.valueOf(position))) { holder.select.setVisibility(View.VISIBLE); } else { holder.select.setVisibility(View.GONE); } return convertView; } class ViewHolder { ImageView photo; ImageView select; } }} 4 .下载地址https://github.com/zhoulinxue/Listdemo.git
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