Android——自由拖动并显示文字的悬浮框实现
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项目中需要实现一个状态显示的悬浮框，要求可以设置两种模式：拖动模式和不可拖动模式。
实现效果图如下：
实现步骤:
1.首先要设置该悬浮框的基本属性：
/**
* 显示弹出框
*
* @param context
*/
@SuppressWarnings("WrongConstant")
public static void showPopupWindow(final Context context, String showtxt)
if (isShown)
return;
isShown = true;
// 获取WindowManager
mWindowManager = (WindowManager) context
.getSystemService(Context.WINDOW_SERVICE);
mView = setUpView(context, showtxt);
params = new WindowManager.LayoutParams();
// 类型，系统提示以及它总是出现在应用程序窗口之上。
params.type = WindowManager.LayoutParams.TYPE_SYSTEM_ALERT |
WindowManager.LayoutParams.TYPE_SYSTEM_OVERLAY;
// 设置flag
int flags = canTouchFlags;
// | WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE;
// 如果设置了WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE，弹出的View收不到Back键的事件
params.flags = flags;
// 不设置这个弹出框的透明遮罩显示为黑色
params.format = PixelFormat.TRANSLUCENT;
// FLAG_NOT_TOUCH_MODAL不阻塞事件传递到后面的窗口
// 设置 FLAG_NOT_FOCUSABLE 悬浮窗口较小时，后面的应用图标由不可长按变为可长按
// 不设置这个flag的话，home页的划屏会有问题
params.width = LayoutParams.WRAP_CONTENT;
params.height = LayoutParams.WRAP_CONTENT;
params.gravity = Gravity.TOP;
mWindowManager.addView(mView, params);
private static int canTouchFlags = WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE
| WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL;
private static int notTouchFlags = WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE|
WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE;
2.设置悬浮框的拖动监听事件：
private static View setUpView(final Context context, String showtxt)
View view = LayoutInflater.from(context).inflate(R.layout.layout_popwindow,
null);
TextView showTv = (TextView) view.findViewById(R.id.tv_showinpop);
showTv.setText(showtxt);
rl_drag_showinpop = (RelativeLayout) view.findViewById(R.id.rl_drag_showinpop);
rl_drag_showinpop.setOnTouchListener(new View.OnTouchListener()
private float lastX; //上一次位置的X.Y坐标
private float lastY;
private float nowX; //当前移动位置的X.Y坐标
private float nowY;
private float tranX; //悬浮窗移动位置的相对值
private float tranY;
@Override
public boolean onTouch(View v, MotionEvent event)
boolean ret = false;
switch (event.getAction())
case MotionEvent.ACTION_DOWN:
// 获取按下时的X，Y坐标
lastX = event.getRawX();
lastY = event.getRawY();
ret = true;
break;
case MotionEvent.ACTION_MOVE:
// 获取移动时的X，Y坐标
nowX = event.getRawX();
nowY = event.getRawY();
// 计算XY坐标偏移量
tranX = nowX - lastX;
tranY = nowY - lastY;
params.x += tranX;
params.y += tranY;
//更新悬浮窗位置
mWindowManager.updateViewLayout(mView, params);
//记录当前坐标作为下一次计算的上一次移动的位置坐标
lastX = nowX;
lastY = nowY;
break;
case MotionEvent.ACTION_UP:
break;
return ret;
);
这里要在down的时候记录坐标，move事件中使用修改params坐标进行移动。
3.设置悬浮框文字属性：
public static void setShowTxt(String txt)
try
TextView showTv = (TextView) mView.findViewById(R.id.tv_showinpop);
showTv.setText(txt);
mWindowManager.updateViewLayout(mView, params);
catch (Exception e)
Log.d(TAG, "setShowTxt: 更新悬浮框错误");
e.printStackTrace();
if(e.getMessage().contains("not attached to window manager"))
mWindowManager.addView(mView, params);
public static void setShowImg(Bitmap bitmap)
try
ImageView showImg = (ImageView) mView.findViewById(R.id.iv_showinpop);
showImg.setImageBitmap(bitmap);
mWindowManager.updateViewLayout(mView, params);
catch (Exception e)
Log.d(TAG, "setShowTxt: 更新悬浮框错误");
e.printStackTrace();
if(e.getMessage().contains("not attached to window manager"))
mWindowManager.addView(mView, params);
介绍完毕，整个类都封装好了，代码如下：
/**
* 悬浮窗工具类
* created by Pumpkin at 17/3/28
*/
public class WindowsUitlity
private static String TAG = WindowsUitlity.class.getSimpleName();
private static WindowManager mWindowManager = null;
private static WindowManager.LayoutParams params;
public static Boolean isShown = false;
private static View mView = null;
/**
* 显示弹出框
*
* @param context
*/
@SuppressWarnings("WrongConstant")
public static void showPopupWindow(final Context context, String showtxt)
if (isShown)
return;
isShown = true;
// 获取WindowManager
mWindowManager = (WindowManager) context
.getSystemService(Context.WINDOW_SERVICE);
mView = setUpView(context, showtxt);
params = new WindowManager.LayoutParams();
// 类型，系统提示以及它总是出现在应用程序窗口之上。
params.type = WindowManager.LayoutParams.TYPE_SYSTEM_ALERT |
WindowManager.LayoutParams.TYPE_SYSTEM_OVERLAY;
// 设置flag
int flags = canTouchFlags;
// | WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE;
// 如果设置了WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE，弹出的View收不到Back键的事件
params.flags = flags;
// 不设置这个弹出框的透明遮罩显示为黑色
params.format = PixelFormat.TRANSLUCENT;
// FLAG_NOT_TOUCH_MODAL不阻塞事件传递到后面的窗口
// 设置 FLAG_NOT_FOCUSABLE 悬浮窗口较小时，后面的应用图标由不可长按变为可长按
// 不设置这个flag的话，home页的划屏会有问题
params.width = LayoutParams.WRAP_CONTENT;
params.height = LayoutParams.WRAP_CONTENT;
params.gravity = Gravity.TOP;
mWindowManager.addView(mView, params);
private static int canTouchFlags = WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE
| WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL;
private static int notTouchFlags = WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE|
WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE;
/**
* 设置是否可响应点击事件
*
* @param isTouchable
*/
public static void setTouchable(boolean isTouchable)
if (isTouchable)
params.flags = canTouchFlags;
else
params.flags = notTouchFlags;
mWindowManager.updateViewLayout(mView, params);
/**
* 隐藏弹出框
*/
public static void hidePopupWindow()
if (isShown && null != mView)
mWindowManager.removeView(mView);
isShown = false;
public static void setShowTxt(String txt)
try
TextView showTv = (TextView) mView.findViewById(R.id.tv_showinpop);
showTv.setText(txt);
mWindowManager.updateViewLayout(mView, params);
catch (Exception e)
Log.d(TAG, "setShowTxt: 更新悬浮框错误");
e.printStackTrace();
if(e.getMessage().contains("not attached to window manager"))
mWindowManager.addView(mView, params);
public static void setShowImg(Bitmap bitmap)
try
ImageView showImg = (ImageView) mView.findViewById(R.id.iv_showinpop);
showImg.setImageBitmap(bitmap);
mWindowManager.updateViewLayout(mView, params);
catch (Exception e)
Log.d(TAG, "setShowTxt: 更新悬浮框错误");
e.printStackTrace();
if(e.getMessage().contains("not attached to window manager"))
mWindowManager.addView(mView, params);
static RelativeLayout rl_drag_showinpop;
private static View setUpView(final Context context, String showtxt)
View view = LayoutInflater.from(context).inflate(R.layout.layout_popwindow,
null);
TextView showTv = (TextView) view.findViewById(R.id.tv_showinpop);
showTv.setText(showtxt);
rl_drag_showinpop = (RelativeLayout) view.findViewById(R.id.rl_drag_showinpop);
rl_drag_showinpop.setOnTouchListener(new View.OnTouchListener()
private float lastX; //上一次位置的X.Y坐标
private float lastY;
private float nowX; //当前移动位置的X.Y坐标
private float nowY;
private float tranX; //悬浮窗移动位置的相对值
private float tranY;
@Override
public boolean onTouch(View v, MotionEvent event)
boolean ret = false;
switch (event.getAction())
case MotionEvent.ACTION_DOWN:
// 获取按下时的X，Y坐标
lastX = event.getRawX();
lastY = event.getRawY();
ret = true;
break;
case MotionEvent.ACTION_MOVE:
// 获取移动时的X，Y坐标
nowX = event.getRawX();
nowY = event.getRawY();
// 计算XY坐标偏移量
tranX = nowX - lastX;
tranY = nowY - lastY;
params.x += tranX;
params.y += tranY;
//更新悬浮窗位置
mWindowManager.updateViewLayout(mView, params);
//记录当前坐标作为下一次计算的上一次移动的位置坐标
lastX = nowX;
lastY = nowY;
break;
case MotionEvent.ACTION_UP:
break;
return ret;
);
return view;
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