Android 中Popwindow弹出菜单的两种方法实例
1.popWindow就是对话框的一种方式！
此文讲解的android中对话框的一种使用方式，它叫popWindow。
2、popWindow的特性
Android的对话框有两种：PopupWindow和AlertDialog。它们的不同点在于：
AlertDialog的位置固定，而PopupWindow的位置可以随意。
AlertDialog是非阻塞线程的，而PopupWindow是阻塞线程的。
PopupWindow的位置按照有无偏移分，可以分为偏移和无偏移两种；按照参照物的不同，可以分为相对于某个控件（Anchor锚）和相对于父控件。
实例代码：
方法一的Activity
package com.app.test02;
import android.app.Activity;
import android.os.Bundle;
import android.view.Gravity;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.View.OnTouchListener;
import android.view.ViewGroup.LayoutParams;
import android.widget.Button;
import android.widget.PopupWindow;
import android.widget.Toast;
public class PopwindowLeft extends Activity {
// 声明PopupWindow对象的引用
private PopupWindow popupWindow;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_popupwindow_main);
// 点击按钮弹出菜单
Button pop = (Button) findViewById(R.id.popBtn);
pop.setOnClickListener(popClick);
}
// 点击弹出左侧菜单的显示方式
OnClickListener popClick = new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
getPopupWindow();
// 这里是位置显示方式,在屏幕的左侧
popupWindow.showAtLocation(v, Gravity.LEFT, 0, 0);
}
};
/**
* 创建PopupWindow
*/
protected void initPopuptWindow() {
// TODO Auto-generated method stub
// 获取自定义布局文件activity_popupwindow_left.xml的视图
View popupWindow_view = getLayoutInflater().inflate(R.layout.activity_popupwindow_left, null,
false);
// 创建PopupWindow实例,200,LayoutParams.MATCH_PARENT分别是宽度和高度
popupWindow = new PopupWindow(popupWindow_view, 200, LayoutParams.MATCH_PARENT, true);
// 设置动画效果
popupWindow.setAnimationStyle(R.style.AnimationFade);
// 点击其他地方消失
popupWindow_view.setOnTouchListener(new OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
// TODO Auto-generated method stub
if (popupWindow != null && popupWindow.isShowing()) {
popupWindow.dismiss();
popupWindow = null;
}
return false;
}
});
}
/***
* 获取PopupWindow实例
*/
private void getPopupWindow() {
if (null != popupWindow) {
popupWindow.dismiss();
return;
} else {
initPopuptWindow();
}
}
}
方法二的Activity
package com.app.test02;
import android.app.Activity;
import android.os.Bundle;
import android.view.Gravity;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.View.OnTouchListener;
import android.view.ViewGroup.LayoutParams;
import android.widget.PopupWindow;
public class PopwindowLeftNew extends Activity{
private PopupWindow popupWindow;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_popupwindow_main);
findViewById(R.id.popBtn).setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
// 获取自定义布局文件activity_popupwindow_left.xml的视图
View popupWindow_view = getLayoutInflater().inflate(R.layout.activity_popupwindow_left, null,false);
// 创建PopupWindow实例,200,LayoutParams.MATCH_PARENT分别是宽度和高度
popupWindow = new PopupWindow(popupWindow_view, 200, LayoutParams.MATCH_PARENT, true);
// 设置动画效果
popupWindow.setAnimationStyle(R.style.AnimationFade);
// 这里是位置显示方式,在屏幕的左侧
popupWindow.showAtLocation(v, Gravity.LEFT, 0, 0);
// 点击其他地方消失
popupWindow_view.setOnTouchListener(new OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
// TODO Auto-generated method stub
if (popupWindow != null && popupWindow.isShowing()) {
popupWindow.dismiss();
popupWindow = null;
}
return false;
}
});
}
});
}
}
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