android ListView内数据的动态添加与删除
16lz
2021-01-23
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() {@Overridepublic void onClick(View arg0) {// TODO Auto-generated method stubadapter.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() {@Overridepublic void onFocusChange(View v, boolean hasFocus) {// TODO Auto-generated method stubif(arr.size()>0){arr.set(position, edit.getText().toString());}}}); del.setOnClickListener(new OnClickListener() {@Overridepublic 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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