//建立建立全域變數類
1 public class MyApplication extends Application {
2
3 /**
4 * 建立全域變數
5 * 全域變數一般都比較傾向於建立一個單獨的資料類檔案，並使用static靜態變數
6 *
7 * 這裡使用了在Application中添加資料的方法實現全域變數
8 * 注意在AndroidManifest.xml中的Application節點添加android:name=".MyApplication"屬性
9 *
10 */
11 private WindowManager.LayoutParams wmParams=new WindowManager.LayoutParams();
12
13 public WindowManager.LayoutParams getMywmParams(){
14 return wmParams;
15 }
//Activity類
1 public class MyFloatViewActivity extends Activity {
2
3
4 /** Called when the activity is first created. */
5
6 private WindowManager wm=null;
7 private WindowManager.LayoutParams wmParams=null;
8
9 private MyFloatView myFV=null;
10
11
12 @Override
13 public void onCreate(Bundle savedInstanceState) {
14 super.onCreate(savedInstanceState);
15 setContentView(R.layout.main);
16
18 }
19
22 private void createView(){
23 myFV=new MyFloatView(getApplicationContext());
24 myFV.setImageResource(R.drawable.icon);
25 //擷取WindowManager
26 wm=(WindowManager)getApplicationContext().getSystemService("window");
27 //設定LayoutParams(全域變數）相關參數
28 wmParams = ((MyApplication)getApplication()).getMywmParams();
29
30 /**
31 *以下都是WindowManager.LayoutParams的相關屬性
32 * 具體用途可參考SDK文檔
33 */
34 wmParams.type=LayoutParams.TYPE_PHONE; //設定window type
35 wmParams.format=PixelFormat.RGBA_8888; //設定圖片格式，效果為背景透明
36
37 //設定Window flag
38 wmParams.flags=LayoutParams.FLAG_NOT_TOUCH_MODAL
39 | LayoutParams.FLAG_NOT_FOCUSABLE;
40 /*
41 * 下面的flags屬性的效果形同“鎖定”。
42 * 懸浮窗不可觸摸，不接受任何事件,同時不影響後面的事件響應。
43 wmParams.flags=LayoutParams.FLAG_NOT_TOUCH_MODAL
44 | LayoutParams.FLAG_NOT_FOCUSABLE
45 | LayoutParams.FLAG_NOT_TOUCHABLE;
46 */
47
48
49 wmParams.gravity=Gravity.LEFT|Gravity.TOP; //調整懸浮視窗至左上方
50 //以螢幕左上方為原點，設定x、y初始值
51 wmParams.x=0;
52 wmParams.y=0;
53
54 //設定懸浮視窗長寬資料
55 wmParams.width=40;
56 wmParams.height=40;
57
58 //顯示myFloatView映像
59 wm.addView(myFV, wmParams);
60
61 }
62
63 @Override
64 public void onDestroy(){
65 super.onDestroy();
66 //在程式退出(Activity銷毀）時銷毀懸浮視窗
67 wm.removeView(myFV);
68 }
69
70 @Override
71 protected void onRestart() {
72 // TODO Auto-generated method stub
73 wm.removeView(myFV);
74 super.onRestart();
75 }
76
79 @Override
80 protected void onStop() {
81 // TODO Auto-generated method stub
82 //建立懸浮視窗
83 createView();
84 super.onStop();
85 }
//浮動視窗內容類別
1 public class MyFloatView extends ImageView {
2 private float mTouchStartX;
3 private float mTouchStartY;
4 private float x;
5 private float y;
6
8 private WindowManager wm=(WindowManager)getContext().getApplicationContext().getSystemService("window");
9
10 //此wmParams為擷取的全域變數，用以儲存懸浮視窗的屬性
11 private WindowManager.LayoutParams wmParams = ((MyApplication)getContext().getApplicationContext()).getMywmParams();
12
13 public MyFloatView(Context context) {
14 super(context);
15 // TODO Auto-generated constructor stub
16 }
17
18 @Override
19 public boolean onTouchEvent(MotionEvent event) {
20
21 //getRawX()擷取相對螢幕的座標，即以螢幕左上方為原點
22 x = event.getRawX();
23 y = event.getRawY()-25; //25是系統狀態列的高度
24 Log.i("currP", "currX"+x+"====currY"+y);
25 switch (event.getAction()) {
26 case MotionEvent.ACTION_DOWN:
27 //getX()擷取相對View的座標，即以此View左上方為原點
28 mTouchStartX = event.getX();
29 mTouchStartY = event.getY();
30
31 Log.i("startP", "startX"+mTouchStartX+"====startY"+mTouchStartY);
32
33 break;
34 case MotionEvent.ACTION_MOVE:
35 updateViewPosition();
36 break;
37
38 case MotionEvent.ACTION_UP:
39 updateViewPosition();
40 mTouchStartX=mTouchStartY=0;
41 break;
42 }
43 return true;
44 }
45
46 private void updateViewPosition(){
47 //更新浮動視窗位置參數,x是滑鼠在螢幕的位置，mTouchStartX是滑鼠在圖片的位置
48 wmParams.x=(int)( x-mTouchStartX);
49 System.out.println(mTouchStartX);
50 wmParams.y=(int) (y-mTouchStartY);
51 wm.updateViewLayout(this, wmParams);
52
53 }
54
55 }
在androidManifest中設定：
<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" />
