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;
}
}
}
