PopupWindow 是一種阻塞式的彈出窗口,這就意味著在我們退出這個彈出框之前,程序會一直等待。它可以浮動在當前Activity的任何的位置上。 需要注意的是,PopupWindow必須觸發某個焦點或者某個事件才會顯示出來,不然總會會出現錯誤。
下面是使用PopupWindow 彈出自定義菜單的例子
當我們點擊Menu鍵的時候,會在當前的Activity最下方彈出一個菜單。
效果圖如下:
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PopupMenuDemo.java
- package com.lingdududu.popupWindow;
- import Android.app.Activity;
- import android.content.Context;
- import android.graphics.drawable.BitmapDrawable;
- import android.os.Bundle;
- import android.view.Gravity;
- import android.view.KeyEvent;
- import android.view.LayoutInflater;
- import android.view.Menu;
- import android.view.MenuItem;
- import android.view.View;
- import android.view.ViewGroup;
- import android.widget.BaseAdapter;
- import android.widget.GridView;
- import android.widget.ImageView;
- import android.widget.LinearLayout;
- import android.widget.PopupWindow;
- import android.widget.TextView;
- import android.widget.LinearLayout.LayoutParams;
- public class PopupMenuDemo extends Activity {
- private int[] resArray = new int[] {
- R.drawable.icon_menu_addto, R.drawable.icon_menu_audioinfo,
- R.drawable.icon_menu_findlrc, R.drawable.icon_menu_scan
- };
- private String[] title = new String[]{
- "添加", "信息", "搜索", "查看"
- };
- private PopupWindow pw = null;
- /** Called when the activity is first created. */
- @Override
- public void onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- setContentView(R.layout.main);
- }
- @Override
- public boolean onCreateOptionsMenu(Menu menu) {
- menu.add("");
- return super.onCreateOptionsMenu(menu);
- }
- /**
- * 在此方法中實現自定義菜單欄
- */
- public boolean onMenuOpened(int featureId, Menu menu) {
- if (pw != null) {
- if (pw.isShowing()) {
- // 就關閉彈出窗口
- pw.dismiss();
- }
- else {
- //在指定位置彈出窗口
- pw.showAtLocation(findViewById(R.id.tv), Gravity.CENTER, 0, 300);
- }
- }
- else {
- LayoutInflater inflater = (LayoutInflater)this.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
- View view = inflater.inflate(R.layout.menu, null);
- GridView grid1 = (GridView)view.findViewById(R.id.menuGridChange);
- grid1.setAdapter(new ImageAdapter(this));
- //生成PopupWindow對象
- pw = new PopupWindow(view,LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT);
- //在指定位置彈出窗口
- pw.showAtLocation(findViewById(R.id.tv), Gravity.CENTER, 0, 300);
- }
- // 此處返回false,系統不會執行onCreateOptionsMenu中添加的菜單
- return false;
- }
- public boolean onKeyDown(int keyCode, KeyEvent event) {
- if(keyCode==KeyEvent.KEYCODE_BACK){
- pw.dismiss();
- return false;
- }
- return super.onKeyDown(keyCode, event);
- }
- @Override
- public boolean onOptionsItemSelected(MenuItem item) {
- return super.onOptionsItemSelected(item);
- }
- public class ImageAdapter extends BaseAdapter {
- private Context context;
- public ImageAdapter(Context context) {
- this.context = context;
- }
- @Override
- public int getCount() {
- return resArray.length;
- }
- @Override
- public Object getItem(int arg0) {
- return resArray[arg0];
- }
- @Override
- public long getItemId(int arg0) {
- return arg0;
- }
- @Override
- public View getView(int arg0, View arg1, ViewGroup arg2) {
- LinearLayout linear = new LinearLayout(context);
- LinearLayout.LayoutParams params = new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
- linear.setOrientation(LinearLayout.VERTICAL);
- ImageView iv = new ImageView(context);
- iv.setImageBitmap(((BitmapDrawable)context.getResources().getDrawable(resArray[arg0])).getBitmap());
- LinearLayout.LayoutParams params2 = new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
- params2.gravity=Gravity.CENTER;
- linear.addView(iv, params2);
- TextView tv = new TextView(context);
- tv.setText(title[arg0]);
- LinearLayout.LayoutParams params3 = new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
- params3.gravity=Gravity.CENTER;
- linear.addView(tv, params3);
- return linear;
- }
- }
- }
main.xml
- <?xml version="1.0" encoding="utf-8"?>
- <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
- android:orientation="vertical"
- android:layout_width="fill_parent"
- android:layout_height="fill_parent"
- >
- <TextView
- android:id="@+id/tv"
- android:layout_width="fill_parent"
- android:layout_height="wrap_content"
- android:text="@string/hello"
- />
- </LinearLayout>
menu.xml
- <?xml version="1.0" encoding="utf-8"?>
- <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
- android:orientation="vertical"
- android:layout_width="fill_parent"
- android:layout_height="fill_parent"
- >
- <TextView
- android:id="@+id/tv"
- android:layout_width="fill_parent"
- android:layout_height="wrap_content"
- android:text="@string/hello"
- />
- </LinearLayout>
menu_bg_frame.xml 這個文件是菜單背景的樣式文件,在drawable-hdpi文件下面
- <?xml version="1.0" encoding="UTF-8"?>
- <shape android:shape="rectangle" xmlns:android="http://schemas.android.com/apk/res/android">
- <solid android:color="#b4000000" />
- <stroke android:width="2.0dip" android:color="#b4ffffff" android:dashWidth="3.0dip" android:dashGap="0.0dip" />
- <padding android:left="7.0dip" android:top="7.0dip" android:right="7.0dip" android:bottom="7.0dip" />
- <corners android:radius="8.0dip" />
- </shape>