弹出小窗口，PopupWindow的使用

点击打开链接:/article/5534371.html

在程序里弹出一个小窗口，像系统的MediaController一样，具体做法：先在mail.xml的layout布局里加一个id，这个到后面会用到的，

1 <?xml version="1.0" encoding="utf-8"?>
2  <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
3     android:orientation="vertical"
4     android:layout_width="fill_parent"
5     android:layout_height="fill_parent"
6     android:id="@+id/linear"<!--这个一定要加-->
7     >

复制代码

接着布局文件里写一个control.xml文件，里面放一些要显示的widget，

1 <?xml version="1.0" encoding="utf-8"?>
2  <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
3     android:orientation="vertical"
4     android:layout_width="fill_parent"
5     android:layout_height="fill_parent"
6     android:gravity="center"
7     android:background="#00000000"
8     >
9     <LinearLayout
10         android:orientation="horizontal"
11         android:layout_width="fill_parent"
12         android:layout_height="wrap_content"
13         android:gravity="center_horizontal"
14         android:layout_marginTop="5dip"
15         android:layout_marginBottom="5dip"
16         >
17         <ImageButton
18         android:id="@+id/sounddown"
19         android:layout_width="wrap_content"
20         android:layout_height="wrap_content"
21         android:src="@drawable/sounddown"
22         />
23
24         <TextView
25         android:id="@+id/textNow"
26         android:layout_width="wrap_content"
27         android:layout_height="wrap_content"
28         android:textSize="20sp"
29         android:text="     "
30         />
31         <SeekBar
32         android:id="@+id/seekbar"
33         android:layout_width="500dip"
34         android:layout_height="wrap_content"
35         android:max="10000"
36         />
37         <TextView
38         android:id="@+id/textAll"
39         android:layout_width="wrap_content"
40         android:layout_height="wrap_content"
41         android:textSize="20sp"
42         android:text="     "
43         />
44         <ImageButton
45         android:id="@+id/soundup"
46         android:layout_width="wrap_content"
47         android:layout_height="wrap_content"
48         android:src="@drawable/soundup"
49         />
50         </LinearLayout>
51       <LinearLayout
52       android:orientation="horizontal"
53       android:layout_width="fill_parent"
54       android:layout_height="wrap_content"
55       android:gravity="center_horizontal"
56       android:background="#0000003D"
57        >
58
59        </LinearLayout>
60
61     </LinearLayout>

复制代码

最后就是java文件，

1 public class MainActivity extends Activity {
2     /** Called when the activity is first created. */
3     private Button show;
4     public PopupWindow mPopupWindow;
5     private boolean boo=true;
6     @Override
7     public void onCreate(Bundle savedInstanceState) {
8         super.onCreate(savedInstanceState);
9         setContentView(R.layout.main);
10         show = (Button) findViewById(R.id.button);
11         show.setOnClickListener(new Button.OnClickListener(){
12
13             @Override
14             public void onClick(View v) {
15                 // TODO Auto-generated method stub
16                  if(boo){
17                     boo=false;
18                     check();
19                     mPopupWindow.showAtLocation(findViewById(R.id.linear), Gravity.RIGHT|Gravity.BOTTOM, 0,0);
20                 }else{
21                     boo=true;
22                     mPopupWindow.dismiss();
23                 }
24
25             }});
26     }
27
28     private void check(){
29         if(mPopupWindow==null){
30             mPopupWindow=new PopupWindow(getLayoutInflater().inflate(R.layout.controler, null),LayoutParams.FILL_PARENT,LayoutParams.WRAP_CONTENT);
31         }
32         if(mPopupWindow.isShowing()){
33             mPopupWindow.dismiss();
34         }
35     }
36 }

复制代码

如果要响应PopupWindow里的widget，可以用LayoutInflater过滤xml文件，再用View view=getLayoutInflater().inflate(resource, root)；就可以了。