界面上有一个浮动按钮,可以用手指拖动,点击该按钮触发事件,我这里是启动扫描,留了一个空实现。
private WindowManager wm; private View view;// 浮动按钮 /** * 添加悬浮View * @param paddingBottom 悬浮View与屏幕底部的距离 */ protected void createFloatView(int paddingBottom) { int w = 200;// 大小 wm = (WindowManager) getSystemService(Context.WINDOW_SERVICE); view = getLayoutInflater().inflate(R.layout.floatview, null); final WindowManager.LayoutParams params = new WindowManager.LayoutParams(); params.type = LayoutParams.TYPE_BASE_APPLICATION;// 所有程序窗口的“基地”窗口,其他应用程序窗口都显示在它上面。 params.flags = LayoutParams.FLAG_NOT_TOUCH_MODAL | LayoutParams.FLAG_NOT_FOCUSABLE; params.format = PixelFormat.TRANSLUCENT;// 不设置这个弹出框的透明遮罩显示为黑色 params.width = w; params.height = w; params.gravity = Gravity.TOP | Gravity.LEFT; int screenWidth = getResources().getDisplayMetrics().widthPixels; int screenHeight = getResources().getDisplayMetrics().heightPixels; params.x = screenWidth - w; params.y = screenHeight - w - paddingBottom; view.setBackgroundColor(Color.TRANSPARENT); view.setVisibility(View.VISIBLE); view.setOnTouchListener(new OnTouchListener() { // 触屏监听 float lastX, lastY; int oldOffsetX, oldOffsetY; int tag = 0;// 悬浮球 所需成员变量 @Override public boolean onTouch(View v, MotionEvent event) { final int action = event.getAction(); float x = event.getX(); float y = event.getY(); if (tag == 0) { oldOffsetX = params.x; // 偏移量 oldOffsetY = params.y; // 偏移量 } if (action == MotionEvent.ACTION_DOWN) { lastX = x; lastY = y; } else if (action == MotionEvent.ACTION_MOVE) { params.x += (int) (x - lastX) / 3; // 减小偏移量,防止过度抖动 params.y += (int) (y - lastY) / 3; // 减小偏移量,防止过度抖动 tag = 1; wm.updateViewLayout(view, params); } else if (action == MotionEvent.ACTION_UP) { int newOffsetX = params.x; int newOffsetY = params.y; // 只要按钮一动位置不是很大,就认为是点击事件 if (Math.abs(oldOffsetX - newOffsetX) <= 20 && Math.abs(oldOffsetY - newOffsetY) <= 20) { onFloatViewClick(); } else { tag = 0; } } return true; } }); wm.addView(view, params); } /** * 点击浮动按钮触发事件,需要override该方法 */ protected void onFloatViewClick() { } /** * 将悬浮View从WindowManager中移除,需要与createFloatView()成对出现 */ protected void removeFloatView() { if (wm != null && view != null) { wm.removeViewImmediate(view); // wm.removeView(view);//不要调用这个,WindowLeaked view = null; wm = null; } } /** * 隐藏悬浮View */ protected void hideFloatView() { if (wm != null && view != null&&view.isShown()) { view.setVisibility(View.GONE); } } /** * 显示悬浮View */ protected void showFloatView(){ if (wm != null && view != null&&!view.isShown()) { view.setVisibility(View.VISIBLE); } }
或者使用Service
只要启动这个 Service,就会创建一个随手指移动的悬浮窗,关闭 Service 会移除悬浮窗。另外由于这里设置了 Window 的 type 为 TYPE_PHONE, 所以需要 SYSTEM_ALERT_WINDOW 权限,也可以使用 TYPE_TOAST。
public class WindowService extends Service { WindowManager windowManager; ImageView imageView; public WindowService() { } @Override public void onCreate() { super.onCreate(); windowManager = (WindowManager) getSystemService(Context.WINDOW_SERVICE); } @Override public IBinder onBind(Intent intent) { return null; } @Override public int onStartCommand(Intent intent, int flags, int startId) { if (imageView == null) { installWindow(); } return START_STICKY; } @Override public void onDestroy() { super.onDestroy(); if (imageView != null) { windowManager.removeView(imageView); } } private void installWindow() { imageView = new ImageView(this.getBaseContext()); imageView.setImageResource(R.mipmap.ic_launcher_round); final WindowManager.LayoutParams layoutParams = new WindowManager.LayoutParams(); layoutParams.format = PixelFormat.TRANSPARENT; layoutParams.width = 200; layoutParams.height = 200; layoutParams.gravity = Gravity.LEFT | Gravity.TOP; layoutParams.type = WindowManager.LayoutParams.TYPE_PHONE; layoutParams.flags = WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL | WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE | WindowManager.LayoutParams.FLAG_FULLSCREEN | WindowManager.LayoutParams.FLAG_LAYOUT_IN_SCREEN; windowManager.addView(imageView, layoutParams); imageView.setOnTouchListener(new View.OnTouchListener() { @Override public boolean onTouch(View v, MotionEvent event) { layoutParams.x = (int) event.getRawX() - 100; layoutParams.y = (int) event.getRawY() - 100; windowManager.updateViewLayout(imageView, layoutParams); return true; } }); } }
http://blog.csdn.net/manymore13
import com.mobovip.bgr.R; import android.content.Context; import android.graphics.PixelFormat; import android.graphics.Rect; import android.util.AttributeSet; import android.util.DisplayMetrics; import android.util.Log; import android.view.Gravity; import android.view.MotionEvent; import android.view.WindowManager; import android.view.WindowManager.LayoutParams; import android.widget.ImageView; /** * @author manymore13 * @Blog <a * href="http://blog.csdn.net/manymore13">http://blog.csdn.net/manymore13 * </a> * @version 1.0 floatView = new FloatView(this); // 创建窗体 * floatView.setOnClickListener(this); // * 设置事件,你需要实现FloatView里的onclick接口 floatView.show(); // 显示该窗体 * floatView.hide(); // 隐藏窗体 */ public class FloatView extends ImageView { private Context c; private float mTouchX; private float mTouchY; private float x; private float y; private int startX; private int startY; private int imgId = R.drawable.ic_launcher; private int controlledSpace = 20; private int screenWidth; private int screenHeight; boolean isShow = false; private OnClickListener mClickListener; private WindowManager windowManager; private WindowManager.LayoutParams windowManagerParams = new WindowManager.LayoutParams(); public FloatView(Context context, AttributeSet attrs) { super(context, attrs); } public FloatView(Context c) { super(c); initView(c); } // 初始化窗体 public void initView(Context c) { windowManager = (WindowManager) c.getApplicationContext() .getSystemService(Context.WINDOW_SERVICE); DisplayMetrics dm=getResources().getDisplayMetrics(); screenWidth = dm.widthPixels; screenHeight = dm.heightPixels; this.setImageResource(imgId); windowManagerParams.type = LayoutParams.TYPE_PHONE; windowManagerParams.format = PixelFormat.RGBA_8888; // 背景透明 windowManagerParams.flags = LayoutParams.FLAG_NOT_TOUCH_MODAL | LayoutParams.FLAG_NOT_FOCUSABLE; // 调整悬浮窗口至左上角,便于调整坐标 windowManagerParams.gravity = Gravity.LEFT | Gravity.TOP; // 以屏幕左上角为原点,设置x、y初始值 windowManagerParams.x = 0; windowManagerParams.y = screenHeight>>1; // 设置悬浮窗口长宽数据 windowManagerParams.width = LayoutParams.WRAP_CONTENT; windowManagerParams.height = LayoutParams.WRAP_CONTENT; } public void setImgResource(int id) { imgId = id; } @Override public boolean onTouchEvent(MotionEvent event) { x = event.getRawX(); y = event.getRawY(); switch (event.getAction()) { case MotionEvent.ACTION_DOWN: { mTouchX = event.getX(); mTouchY = event.getY(); startX = (int) event.getRawX(); startY = (int) event.getRawY(); break; } case MotionEvent.ACTION_MOVE: { updateViewPosition(); break; } case MotionEvent.ACTION_UP: { if (Math.abs(x - startX) < controlledSpace && Math.abs(y - startY) < controlledSpace) { if (mClickListener != null) { mClickListener.onClick(this); } } // Log.i("tag", "x=" + x + " startX+" + startX + " y=" + y // + " startY=" + startY); if (x <= screenWidth / 2) { x = 0; } else { x = screenWidth; } updateViewPosition(); break; } } return super.onTouchEvent(event); } // 隐藏该窗体 public void hide() { if (isShow) { windowManager.removeView(this); isShow = false; } } // 显示该窗体 public void show() { if (isShow == false) { windowManager.addView(this, windowManagerParams); isShow = true; } } @Override public void setOnClickListener(OnClickListener l) { this.mClickListener = l; } private void updateViewPosition() { // 更新浮动窗口位置参数 windowManagerParams.x = (int) (x - mTouchX); windowManagerParams.y = (int) (y - mTouchY); windowManager.updateViewLayout(this, windowManagerParams); // 刷新显示 } }
一个Android布局可以拖动排序子控件:RearrangeableLayout
https://github.com/rajasharan/RearrangeableLayout