安卓自定義控件_下拉選擇框spinnerdemo

1spinnerdemo

package com.itheima.spinnerdemo;

import java.util.ArrayList;
import java.util.List;

import android.os.Bundle;
import android.app.Activity;
import android.graphics.drawable.BitmapDrawable;
import android.view.Menu;
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.EditText;
import android.widget.ImageButton;
import android.widget.ListView;
import android.widget.PopupWindow;
import android.widget.TextView;

public class MainActivity extends Activity implements OnItemClickListener {
	
	private List<String> numberList;
	private EditText etNumber;
	private NumberAdapter mAdapter;
	private PopupWindow pw;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        etNumber = (EditText) findViewById(R.id.et_number);
    }

    /**
     * 彈出選擇号碼的對話框
     * @param v
     */
    public void showNumberList(View v) {
    	// 初始化ListView控件和裡邊的資料
    	ListView mListView = initListView();
    	
    	// 彈出一個PopupWindow的窗體, 把ListView作為其内容部分顯示.
    	pw = new PopupWindow(mListView, etNumber.getWidth() - 4, 300);
    	
    	// 設定可以使用焦點
    	pw.setFocusable(true);
    	
    	// 設定popupwindow點選外部可以被關閉
    	pw.setOutsideTouchable(true);
    	// 設定一個popupWindow的背景
    	pw.setBackgroundDrawable(new BitmapDrawable());
    	
    	// 把popupwindow顯示出來, 顯示的位置是: 在輸入框的下面, 和輸入框是連着的.
    	pw.showAsDropDown(etNumber, 2, -5); 
    }

	/**
	 * 初始化一個Listview
	 * @return
	 */
	private ListView initListView() {
		ListView mListView = new ListView(this);
		mListView.setDividerHeight(0);
		mListView.setBackgroundResource(R.drawable.listview_background);
		// 去掉右側垂直滑動條
		mListView.setVerticalScrollBarEnabled(false);
		mListView.setOnItemClickListener(this);
		
		// 模拟資料
		numberList = new ArrayList<String>();
		for (int i = 0; i < 30; i++) {
			numberList.add("100000" + i);
		}
		
		// 設定擴充卡展示資料
		mAdapter = new NumberAdapter();
		mListView.setAdapter(mAdapter);
		return mListView;
	}
    
	class NumberAdapter extends BaseAdapter {

		@Override
		public int getCount() {
			return numberList.size();
		}

		@Override
		public View getView(final int position, View convertView, ViewGroup parent) {
			NumberHolder mHolder = null;
			if(convertView == null) {
				convertView = View.inflate(MainActivity.this, R.layout.listview_item, null);
				mHolder = new NumberHolder(); // 緩存類
				mHolder.tvNumber = (TextView) convertView.findViewById(R.id.tv_listview_item_number);
				mHolder.ibDelete = (ImageButton) convertView.findViewById(R.id.ib_listview_item_delete);
				// 把Holder類設定給convertView對象.
				convertView.setTag(mHolder);
			} else {
				mHolder = (NumberHolder) convertView.getTag();
			}
			
			mHolder.tvNumber.setText(numberList.get(position));
			mHolder.ibDelete.setOnClickListener(new OnClickListener() {
				
				@Override
				public void onClick(View v) {
					System.out.println("删除: " + position);
					
					numberList.remove(position);
					mAdapter.notifyDataSetChanged();
					
					// 如果全部的号碼都被删除了, popupwindow應該被關閉掉.
					if(numberList.size() == 0) {
						pw.dismiss();
					}
				}
			});
			return convertView;
		}

		@Override
		public Object getItem(int position) {
			return null;
		}

		@Override
		public long getItemId(int position) {
			return 0;
		}
	}
	
	class NumberHolder {
		public TextView tvNumber;
		public ImageButton ibDelete;
	}

	@Override
	public void onItemClick(AdapterView<?> parent, View view, int position,
			long id) {
		System.out.println("onItemClick: " + position);
		
		String number = numberList.get(position);
		etNumber.setText(number);
		pw.dismiss();
	}
}
           

package com.itheima.spinnerdemo;

import java.util.ArrayList;
import java.util.List;

import android.os.Bundle;
import android.app.Activity;
import android.graphics.drawable.BitmapDrawable;
import android.view.Menu;
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.EditText;
import android.widget.ImageButton;
import android.widget.ListView;
import android.widget.PopupWindow;
import android.widget.TextView;

public class MainActivity extends Activity implements OnItemClickListener {
	
	private List
   
     numberList;
	private EditText etNumber;
	private NumberAdapter mAdapter;
	private PopupWindow pw;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        etNumber = (EditText) findViewById(R.id.et_number);
    }

    /**
     * 彈出選擇号碼的對話框
     * @param v
     */
    public void showNumberList(View v) {
    	// 初始化ListView控件和裡邊的資料
    	ListView mListView = initListView();
    	
    	// 彈出一個PopupWindow的窗體, 把ListView作為其内容部分顯示.
    	pw = new PopupWindow(mListView, etNumber.getWidth() - 4, 300);
    	
    	// 設定可以使用焦點
    	pw.setFocusable(true);
    	
    	// 設定popupwindow點選外部可以被關閉
    	pw.setOutsideTouchable(true);
    	// 設定一個popupWindow的背景
    	pw.setBackgroundDrawable(new BitmapDrawable());
    	
    	// 把popupwindow顯示出來, 顯示的位置是: 在輸入框的下面, 和輸入框是連着的.
    	pw.showAsDropDown(etNumber, 2, -5); 
    }

	/**
	 * 初始化一個Listview
	 * @return
	 */
	private ListView initListView() {
		ListView mListView = new ListView(this);
		mListView.setDividerHeight(0);
		mListView.setBackgroundResource(R.drawable.listview_background);
		// 去掉右側垂直滑動條
		mListView.setVerticalScrollBarEnabled(false);
		mListView.setOnItemClickListener(this);
		
		// 模拟資料
		numberList = new ArrayList
    
     ();
		for (int i = 0; i < 30; i++) {
			numberList.add("100000" + i);
		}
		
		// 設定擴充卡展示資料
		mAdapter = new NumberAdapter();
		mListView.setAdapter(mAdapter);
		return mListView;
	}
    
	class NumberAdapter extends BaseAdapter {

		@Override
		public int getCount() {
			return numberList.size();
		}

		@Override
		public View getView(final int position, View convertView, ViewGroup parent) {
			NumberHolder mHolder = null;
			if(convertView == null) {
				convertView = View.inflate(MainActivity.this, R.layout.listview_item, null);
				mHolder = new NumberHolder(); // 緩存類
				mHolder.tvNumber = (TextView) convertView.findViewById(R.id.tv_listview_item_number);
				mHolder.ibDelete = (ImageButton) convertView.findViewById(R.id.ib_listview_item_delete);
				// 把Holder類設定給convertView對象.
				convertView.setTag(mHolder);
			} else {
				mHolder = (NumberHolder) convertView.getTag();
			}
			
			mHolder.tvNumber.setText(numberList.get(position));
			mHolder.ibDelete.setOnClickListener(new OnClickListener() {
				
				@Override
				public void onClick(View v) {
					System.out.println("删除: " + position);
					
					numberList.remove(position);
					mAdapter.notifyDataSetChanged();
					
					// 如果全部的号碼都被删除了, popupwindow應該被關閉掉.
					if(numberList.size() == 0) {
						pw.dismiss();
					}
				}
			});
			return convertView;
		}

		@Override
		public Object getItem(int position) {
			return null;
		}

		@Override
		public long getItemId(int position) {
			return 0;
		}
	}
	
	class NumberHolder {
		public TextView tvNumber;
		public ImageButton ibDelete;
	}

	@Override
	public void onItemClick(AdapterView
      parent, View view, int position,
			long id) {
		System.out.println("onItemClick: " + position);
		
		String number = numberList.get(position);
		etNumber.setText(number);
		pw.dismiss();
	}
}