Android实现自由拖动并显示文字的悬浮框

编辑: admin 分类: Android 发布时间: 2021-11-29 来源:互联网

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);
}

比较重要的点是要注意设置flags，我这里提供了两种flags以供切换：

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;

第一种是可触摸不可聚焦模式，第二种是不可触摸不可聚焦模式。其他的flags可以从api中查阅。

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);
  }
 }
}

4.更新悬浮框图片显示：

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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