Android实现悬浮窗体效果

public class DesktopLayout extends LinearLayout {

 public DesktopLayout(Context context) {
  super(context);
  setOrientation(LinearLayout.VERTICAL);// 水平排列
  

  //设置宽高
  this.setLayoutParams( new LayoutParams(LayoutParams.WRAP_CONTENT,
    LayoutParams.WRAP_CONTENT));
  
  View view = LayoutInflater.from(context).inflate( 
    R.layout.desklayout, null); 
  this.addView(view);
 }

// 取得系统窗体
 mWindowManager = (WindowManager) getApplicationContext()
    .getSystemService("window");

// 窗体的布局样式
 mLayout = new WindowManager.LayoutParams();

// 设置窗体显示类型——TYPE_SYSTEM_ALERT(系统提示)
 mLayout.type = WindowManager.LayoutParams.TYPE_SYSTEM_ALERT;

// 设置窗体焦点及触摸：
// FLAG_NOT_FOCUSABLE(不能获得按键输入焦点)
 mLayout.flags = WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE;

// 设置显示的模式
  mLayout.format = PixelFormat.RGBA_8888;

// 设置对齐的方法
  mLayout.gravity = Gravity.TOP | Gravity.LEFT;

// 设置窗体宽度和高度
  mLayout.width = WindowManager.LayoutParams.WRAP_CONTENT;
  mLayout.height = WindowManager.LayoutParams.WRAP_CONTENT;

package com.yc.yc_suspendingform;

import android.app.Activity;
import android.graphics.PixelFormat;
import android.graphics.Rect;
import android.os.Bundle;
import android.util.Log;
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.WindowManager;
import android.widget.Button;
import com.yc.yc_floatingform.R;

public class MainActivity extends Activity {
 private WindowManager mWindowManager;
 private WindowManager.LayoutParams mLayout;
 private DesktopLayout mDesktopLayout;
 private long startTime;
 // 声明屏幕的宽高
 float x, y;
 int top;

 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);  
  createWindowManager();
  createDesktopLayout();
  Button btn = (Button) findViewById(R.id.btn);
  btn.setOnClickListener(new OnClickListener() {
   public void onClick(View v) {
    showDesk();
   }
  });
 }
 /**
  * 创建悬浮窗体
  */
 private void createDesktopLayout() {
  mDesktopLayout = new DesktopLayout(this);
  mDesktopLayout.setOnTouchListener(new OnTouchListener() {
   float mTouchStartX;
   float mTouchStartY;

   @Override
   public boolean onTouch(View v, MotionEvent event) {
    // 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() - top; // 25是系统状态栏的高度
    Log.i("startP", "startX" + mTouchStartX + "====startY"
      + mTouchStartY);
    switch (event.getAction()) {
    case MotionEvent.ACTION_DOWN:
     // 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);
     long end = System.currentTimeMillis() - startTime;
     // 双击的间隔在 300ms以下
     if (end < 300) {
      closeDesk();
     }
     startTime = System.currentTimeMillis();
     break;
    case MotionEvent.ACTION_MOVE:
     // 更新浮动窗口位置参数
     mLayout.x = (int) (x - mTouchStartX);
     mLayout.y = (int) (y - mTouchStartY);
     mWindowManager.updateViewLayout(v, mLayout);
     break;
    case MotionEvent.ACTION_UP:

     // 更新浮动窗口位置参数
     mLayout.x = (int) (x - mTouchStartX);
     mLayout.y = (int) (y - mTouchStartY);
     mWindowManager.updateViewLayout(v, mLayout);

     // 可以在此记录最后一次的位置

     mTouchStartX = mTouchStartY = 0;
     break;
    }
    return true;
   }
  });
 }

 @Override
 public void onWindowFocusChanged(boolean hasFocus) {
  super.onWindowFocusChanged(hasFocus);
  Rect rect = new Rect();
  // /取得整个视图部分,注意，如果你要设置标题样式，这个必须出现在标题样式之后，否则会出错
  getWindow().getDecorView().getWindowVisibleDisplayFrame(rect);
  top = rect.top;//状态栏的高度，所以rect.height,rect.width分别是系统的高度的宽度

  Log.i("top",""+top);
 }

 /**
  * 显示DesktopLayout
  */
 private void showDesk() {
  mWindowManager.addView(mDesktopLayout, mLayout);
  finish();
 }

 /**
  * 关闭DesktopLayout
  */
 private void closeDesk() {
  mWindowManager.removeView(mDesktopLayout);
  finish();
 }

 /**
  * 设置WindowManager
  */
 private void createWindowManager() {
  // 取得系统窗体
  mWindowManager = (WindowManager) getApplicationContext()
    .getSystemService("window");

  // 窗体的布局样式
  mLayout = new WindowManager.LayoutParams();

  // 设置窗体显示类型——TYPE_SYSTEM_ALERT(系统提示)
  mLayout.type = WindowManager.LayoutParams.TYPE_SYSTEM_ALERT;

  // 设置窗体焦点及触摸：
  // FLAG_NOT_FOCUSABLE(不能获得按键输入焦点)
  mLayout.flags = WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE;

  // 设置显示的模式
  mLayout.format = PixelFormat.RGBA_8888;

  // 设置对齐的方法
  mLayout.gravity = Gravity.TOP | Gravity.LEFT;

  // 设置窗体宽度和高度
  mLayout.width = WindowManager.LayoutParams.WRAP_CONTENT;
  mLayout.height = WindowManager.LayoutParams.WRAP_CONTENT;

 }

}