Android特效第二篇：完美PopupWindow（记住用户名模拟） .

Android与桌面程序一样，记住历史登录的所有用户，且以下拉先选取很重要，可以删除记住过的某些用户，这个可以借助PopupWindow来模拟。
请看我的测试效果图:

                             

 

部分代码：

package com.jefry.pop;

import android.app.Activity;
import android.graphics.Color;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.EditText;
import android.widget.ImageButton;
import android.widget.PopupWindow;
import android.widget.AdapterView.OnItemClickListener;

/**
 *
 * @author jefry
 *
 */
public class MemoryActivity extends Activity implements OnClickListener{
    /** Called when the activity is first created. */

    SpinnerListView list;
    PopupWindow pop;
    EditText userEText;
    int item_h = 50;
    int count;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        ImageButton select = (ImageButton) findViewById(R.id.bnt_login_select);
        userEText = (EditText) findViewById(R.id.username);
        select.setOnClickListener(this);
        list = new SpinnerListView(this);
        list.setCacheColorHint(Color.TRANSPARENT);
        list.setDividerHeight(0);

        item_h = getResources().getDimensionPixelSize(R.dimen.pop_item_height);
    }

    public void onClick(View view) {
        switch (view.getId()) {
        case R.id.bnt_login_select:
                pop = new PopupWindow(list, userEText.getWidth(), item_h
                        * list.getSize());
                pop.setAnimationStyle(0);
                pop.showAsDropDown(userEText);
            break;
        default:
            break;
        }
    }

    public void dismiss(String username){
        userEText.setText(username);
        pop.dismiss();
    }

}