android ListView内数据的动态添加与删除
main.xml 文件:
- <?xml version="1.0" encoding="utf-8"?>
- <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
- android:layout_width="fill_parent"
- android:layout_height="fill_parent"
- android:orientation="horizontal"
- >
- <LinearLayout
- android:layout_width="fill_parent"
- android:layout_height="fill_parent"
- android:orientation="vertical"
- >
- <ListView
- android:id="@+id/listview"
- android:layout_width="fill_parent"
- android:layout_height="wrap_content"
- />
- <Button
- android:id="@+id/add"
- android:layout_width="wrap_content"
- android:layout_height="wrap_content"
- android:text="添加"
- />
- </LinearLayout>
- </LinearLayout>
listview_item.xml文件:
- <?xml version="1.0" encoding="utf-8"?>
- <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
- android:layout_width="fill_parent"
- android:layout_height="wrap_content"
- android:orientation="horizontal"
- android:background="#000000"
- android:padding="20dp"
- >
- <EditText
- android:id="@+id/edit"
- android:layout_width="200dp"
- android:layout_height="wrap_content"
- />
- <Button
- android:id="@+id/del"
- android:layout_width="wrap_content"
- android:layout_height="wrap_content"
- android:text="删除"
- />
- </LinearLayout>
MainActivity .java
- package com.yyy.testandroid;
- import java.util.ArrayList;
- import android.app.Activity;
- import android.content.Context;
- import android.os.Bundle;
- import android.view.LayoutInflater;
- import android.view.View;
- import android.view.View.OnClickListener;
- import android.view.View.OnFocusChangeListener;
- import android.view.ViewGroup;
- import android.widget.BaseAdapter;
- import android.widget.Button;
- import android.widget.EditText;
- import android.widget.ListView;
- import android.widget.TextView;
- public class TestAndroidActivity extends Activity {
- /** Called when the activity is first created. */
- private Button button,add;
- private TextView text;
- private ListView listview;
- public MyAdapter adapter;
- @Override
- public void onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- setContentView(R.layout.main);
- listview = (ListView) findViewById(R.id.listview);
- add = (Button) findViewById(R.id.add);
- adapter = new MyAdapter(this);
- listview.setAdapter(adapter);
- add.setOnClickListener(new OnClickListener() {
- @Override
- public void onClick(View arg0) {
- // TODO Auto-generated method stub
- adapter.arr.add("");
- adapter.notifyDataSetChanged();
- }
- });
- }
- private class MyAdapter extends BaseAdapter {
- private Context context;
- private LayoutInflater inflater;
- public ArrayList<String> arr;
- public MyAdapter(Context context) {
- super();
- this.context = context;
- inflater = LayoutInflater.from(context);
- arr = new ArrayList<String>();
- for(int i=0;i<3;i++){ //listview初始化3个子项
- arr.add("");
- }
- }
- @Override
- public int getCount() {
- // TODO Auto-generated method stub
- return arr.size();
- }
- @Override
- public Object getItem(int arg0) {
- // TODO Auto-generated method stub
- return arg0;
- }
- @Override
- public long getItemId(int arg0) {
- // TODO Auto-generated method stub
- return arg0;
- }
- @Override
- public View getView(final int position, View view, ViewGroup arg2) {
- // TODO Auto-generated method stub
- if(view == null){
- view = inflater.inflate(R.layout.list_item, null);
- }
- final EditText edit = (EditText) view.findViewById(R.id.edit);
- edit.setText(arr.get(position)); //在重构adapter的时候不至于数据错乱
- Button del = (Button) view.findViewById(R.id.del);
- edit.setOnFocusChangeListener(new OnFocusChangeListener() {
- @Override
- public void onFocusChange(View v, boolean hasFocus) {
- // TODO Auto-generated method stub
- if(arr.size()>0){
- arr.set(position, edit.getText().toString());
- }
- }
- });
- del.setOnClickListener(new OnClickListener() {
- @Override
- public void onClick(View arg0) {
- // TODO Auto-generated method stub
- //从集合中删除所删除项的EditText的内容
- arr.remove(position);
- adapter.notifyDataSetChanged();
- }
- });
- return view;
- }
- }
- }
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