android 一直在最前面的浮动窗口效果
今天发现一些软件可以在android 的桌面上显示一些浮动小窗口，经过一番查找，终于找到的解决方案，代码如下：
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FloatingFunc.java
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package hrxcframe.comm;
import android.app.Activity;
import android.content.Context;
import android.graphics.Rect;
import android.test.R;
import android.util.Log;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.Window;
import android.view.WindowManager;
import android.view.WindowManager.LayoutParams;
/**
?* 可以永远显示在android屏幕最上方的浮动菜单
?*
?* @author liujl v1.0 需要添加 <uses-permission
?*???????? android:name="android.permission.SYSTEM_ALERT_WINDOW"
?*???????? /><!--系统弹出窗口权限-->权限不然会报错
?*/
public class FloatingFunc {
??? /**
??? ?* 浮动窗口在屏幕中的x坐标
??? ?*/
??? private static float x = 0;
??? /**
??? ?* 浮动窗口在屏幕中的y坐标
??? ?*/
??? private static float y = 200;
??? /**
??? ?* 屏幕触摸状态，暂时未使用
??? ?*/
??? private static float state = 0;
??? /**
??? ?* 鼠标触摸开始位置
??? ?*/
??? private static float mTouchStartX = 0;
??? /**
??? ?* 鼠标触摸结束位置
??? ?*/
??? private static float mTouchStartY = 0;
??? /**
??? ?* windows 窗口管理器
??? ?*/
??? private static WindowManager wm = null;
??? /**
??? ?* 浮动显示对象
??? ?*/
??? private static View floatingViewObj = null;
??? /**
??? ?* 参数设定类
??? ?*/
??? public static WindowManager.LayoutParams params = new WindowManager.LayoutParams();
??? public static int TOOL_BAR_HIGH = 0;
??? /**
??? ?* 要显示在窗口最前面的对象
??? ?*/
??? private static View view_obj = null;
??? /**
??? ?* 要显示在窗口最前面的方法
??? ?*
??? ?* @param context
??? ?*??????????? 调用对象Context getApplicationContext()
??? ?* @param window
??? ?*??????????? 调用对象 Window getWindow()
??? ?* @param floatingViewObj
??? ?*??????????? 要显示的浮动对象 View
??? ?*/
??? public static void show(Context context, Window window, View floatingViewObj) {
??? ??? // 加载xml文件中样式例子代码
??? ??? // ********************************Start**************************
??? ??? // LayoutInflater inflater =
??? ??? // LayoutInflater.from(getApplicationContext());
??? ??? // View view = inflater.inflate(R.layout.topframe, null);
??? ??? // wm =
??? ??? // (WindowManager)context.getApplicationContext().getSystemService(Context.WINDOW_SERVICE);
??? ??? // 加载xml文件中样式例子代码
??? ??? // *********************************End***************************
??? ??? //
??? ??? // 关闭浮动显示对象然后再显示
??? ??? close(context);
??? ??? FloatingFunc.floatingViewObj = floatingViewObj;
??? ??? view_obj = floatingViewObj;
??? ??? Rect frame = new Rect();
??? ??? // 这一句是关键，让其在top 层显示
??? ??? // getWindow()
??? ??? window.getDecorView().getWindowVisibleDisplayFrame(frame);
??? ??? TOOL_BAR_HIGH = frame.top;
??? ??? wm = (WindowManager) context// getApplicationContext()
??? ??? ??? ??? .getSystemService(Activity.WINDOW_SERVICE);
??? ??? params.type = WindowManager.LayoutParams.TYPE_SYSTEM_ALERT
??? ??? ??? ??? | WindowManager.LayoutParams.TYPE_SYSTEM_OVERLAY;
??? ??? params.flags = LayoutParams.FLAG_NOT_TOUCH_MODAL
??? ??? ??? ??? | LayoutParams.FLAG_NOT_FOCUSABLE;
??? ??? // 设置悬浮窗口长宽数据
??? ??? params.width = WindowManager.LayoutParams.WRAP_CONTENT;
??? ??? params.height = WindowManager.LayoutParams.WRAP_CONTENT;
??? ??? // 设定透明度
??? ??? params.alpha = 80;
??? ??? // 设定内部文字对齐方式
??? ??? params.gravity = Gravity.LEFT | Gravity.TOP;
??? ??? // 以屏幕左上角为原点，设置x、y初始值?
??? ??? params.x = (int) x;
??? ??? params.y = (int) y;
??? ??? // tv = new MyTextView(TopFrame.this);
??? ??? wm.addView(floatingViewObj, params);
??? }
??? /**
??? ?* 跟谁滑动移动
??? ?*
??? ?* @param event
??? ?*??????????? 事件对象
??? ?* @param view
??? ?*??????????? 弹出对象实例（View）
??? ?* @return
??? ?*/
??? public static boolean onTouchEvent(MotionEvent event, View view) {
??? ??? // 获取相对屏幕的坐标，即以屏幕左上角为原点
??? ??? x = event.getRawX();
??? ??? y = event.getRawY() - 25; // 25是系统状态栏的高度
??? ??? Log.i("currP", "currX" + x + "====currY" + y);// 调试信息
??? ??? switch (event.getAction()) {
??? ??? case MotionEvent.ACTION_DOWN:
??? ??? ??? state = MotionEvent.ACTION_DOWN;
??? ??? ??? // panTime();
??? ??? ??? // 获取相对View的坐标，即以此View左上角为原点
??? ??? ??? mTouchStartX = event.getX();
??? ??? ??? mTouchStartY = event.getY();
??? ??? ??? Log.i("startP", "startX" + mTouchStartX + "====startY"
??? ??? ??? ??? ??? + mTouchStartY);// 调试信息
??? ??? ??? break;
??? ??? case MotionEvent.ACTION_MOVE:
??? ??? ??? state = MotionEvent.ACTION_MOVE;
??? ??? ??? updateViewPosition(view);
??? ??? ??? break;
??? ??? case MotionEvent.ACTION_UP:
??? ??? ??? state = MotionEvent.ACTION_UP;
??? ??? ??? updateViewPosition(view);
??? ??? ??? mTouchStartX = mTouchStartY = 0;
??? ??? ??? break;
??? ??? }
??? ??? return true;
??? }
??? /**
??? ?* 关闭浮动显示对象
??? ?*/
??? public static void close(Context context) {
??? ??? if (view_obj != null && view_obj.isShown()) {
??? ??? ??? WindowManager wm = (WindowManager) context
??? ??? ??? ??? ??? .getSystemService(Activity.WINDOW_SERVICE);
??? ??? ??? wm.removeView(view_obj);
??? ??? }
??? }
??? /**
??? ?* 更新弹出窗口位置
??? ?*/
??? private static void updateViewPosition(View view) {
??? ??? // 更新浮动窗口位置参数
??? ??? params.x = (int) (x - mTouchStartX);
??? ??? params.y = (int) (y - mTouchStartY);
??? ??? wm.updateViewLayout(FloatingFunc.floatingViewObj, params);
??? }
}
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测试代码，放到任意的 Activity 代码里就可以,可以用手拖动位置
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final TextView tv = new TextView(getApplicationContext());
??? ??? ??? ??? tv.setText("http://www.my400800.cn");
??? ??? ??? ??? view.setOnTouchListener(new View.OnTouchListener() {
??? ??? ??? ??? ???
??? ??? ??? ??? ??? @Override
??? ??? ??? ??? ??? public boolean onTouch(View arg0, MotionEvent arg1) {
??? ??? ??? ??? ??? ??? FloatingFunc.onTouchEvent(arg1, tv);
??? ??? ??? ??? ??? ??? return true;
??? ??? ??? ??? ??? }
??? ??? ??? ??? });
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效果如下：
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注意事项：
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一定要在AndroidManifest.xml添加
??? <uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" />
系统权限，不然会出错的呀。。。。。。。。。。。。。
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1 楼 a510779720 2011-10-25 // 这一句是关键，让其在top 层显示