Android实现悬浮窗体效果

<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" / 

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;
}
}