android ListView內數據的動態添加與刪除

openkk 12年前發布 | 69K 次閱讀 Android Android開發 移動開發

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="
        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="刪除"  
    />  

</LinearLayout>  </pre>MainActivity .java<pre class="brush:java; toolbar: true; auto-links: false;">    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個子項  
                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));    //在重構adapter的時候不至于數據錯亂  
            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  
                    //從集合中刪除所刪除項的EditText的內容  
                    arr.remove(position);  
                    adapter.notifyDataSetChanged();  
                }  
            });  
            return view;  
        }  
    }  
}  </pre>
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