PopupWindow的使用

简单理解该组件就是类似弹出层的一种android组件，这种组件类似QQ的状态修改的弹出，下面就来看下这类弹出窗怎么实现

1.对于弹出窗的内容，简单的做法就是写一个布局xml文件

2.下面就是主界面的配置文件了，这里就定义一个textview和一个按钮，点击按钮就出现弹出窗，点击单选按钮textview的内容随之改变

（1）读取布局文件

（2）实例化PopupWindow，添加单选按钮事件处理

下面是主界面文件

下面则是最主要的逻辑代码

package org.lxh.popwin;

import android.app.Activity;
import android.os.Bundle;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.Button;
import android.widget.PopupWindow;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.TextView;

public class PopwinActivity extends Activity {
	private Button updatestatus = null;
	private PopupWindow popWin = null;
	private View view = null;
	private RadioGroup changestatus = null;
	private TextView status = null;

	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
		status = (TextView) this.findViewById(R.id.status);
		updatestatus = (Button) this.findViewById(R.id.updatestatus);

		updatestatus.setOnClickListener(new View.OnClickListener() {

			public void onClick(View v) {
				LayoutInflater flate = LayoutInflater.from(PopwinActivity.this);
				view = flate.inflate(R.layout.popwin, null);
				//实例化PopupWindow
				popWin = new PopupWindow(view, 300, 200);
				changestatus = (RadioGroup) view
						.findViewById(R.id.changestatus);
				// 单选改变事件
				changestatus
						.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {

							public void onCheckedChanged(RadioGroup group,
									int checkedId) {
								// 取得单选按钮
								RadioButton rButton = (RadioButton) view
										.findViewById(group
												.getCheckedRadioButtonId());
								status.setText(rButton.getText().toString());
								//关闭弹出窗口
								popWin.dismiss();
							}
						});
				//显示弹出窗口
				popWin.showAtLocation(updatestatus, Gravity.CENTER, 0, 0);
			}
		});

	}
}

很简单吧，看下效果图吧