感谢原作者：尧石
主页面布局很简单，只有一个RelativelyLayout
<?xml version="1.0" encoding="utf-8"?><RelativeLayout android:id="@+id/rl_content" xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" tools:context="example.floatingviewtest.MainActivity"></RelativeLayout>
悬浮窗中只有一个TextView
<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="wrap_content" android:layout_height="wrap_content"> <TextView android:id="@+id/tv_text" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="这是一个悬浮TextView" android:paddingTop="30dp" android:paddingBottom="30dp" android:background="@color/colorPrimary" android:textSize="15sp"/></LinearLayout>
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主界面代码
public class MainActivity extends AppCompatActivity { private static final String TAG = "MainActivity"; /** * 获取sdk版本号 */ private static final int SDKVERSION = Build.VERSION.SDK_INT; /** * 窗口管理器 */ private WindowManager windowManager; /** * 浮动按钮布局 */ private View floatingButtonView; /** * 浮动按钮布局参数 */ private WindowManager.LayoutParams floatingButtonParams; /** * 顶部状态栏高度 */ private int top; /** * 浮动窗原始位置 */ private float startPositionX = 0; private float startPositionY = 0; /** * 屏幕宽高 */ private int contentWidth; private int contentHeight; private float lastX; private float lastY; private float mTouchStartX; private float mTouchStartY; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); windowManager = (WindowManager) getSystemService(WINDOW_SERVICE); initFloatingButton(); } private void initFloatingButton() { floatingButtonView = LayoutInflater.from(this).inflate(R.layout.floating_view, null); floatingButtonParams = new WindowManager.LayoutParams(); if (SDKVERSION >= 19) { floatingButtonParams.type = WindowManager.LayoutParams.TYPE_TOAST; } else { floatingButtonParams.type = WindowManager.LayoutParams.TYPE_SYSTEM_ALERT; } floatingButtonParams.flags = WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL | WindowManager.LayoutParams .FLAG_NOT_FOCUSABLE; floatingButtonParams.format = PixelFormat.TRANSLUCENT; floatingButtonParams.width = WindowManager.LayoutParams.WRAP_CONTENT; floatingButtonParams.height = WindowManager.LayoutParams.WRAP_CONTENT; floatingButtonParams.gravity = Gravity.TOP| Gravity.LEFT; floatingButtonParams.x = 0; floatingButtonParams.y = 0; Log.d(TAG, "initFloatingButton: " + floatingButtonParams.x + " " + floatingButtonParams.y); windowManager.addView(floatingButtonView, floatingButtonParams); floatingButtonView.setOnTouchListener(new View.OnTouchListener() { @Override public boolean onTouch(View v, MotionEvent event) { lastX = event.getRawX(); lastY = event.getRawY() - top; switch (event.getActionMasked()) { case MotionEvent.ACTION_DOWN: mTouchStartX = event.getX(); mTouchStartY = event.getY(); startPositionX = floatingButtonParams.x; startPositionY = floatingButtonParams.y; Log.d(TAG, "onTouch down : m " + mTouchStartX + " " + mTouchStartY); Log.d(TAG, "onTouch down : last " + lastX + " " + lastY); Log.d(TAG, "onTouch down : start " + startPositionX + " " + startPositionY); Log.d(TAG, "onTouch down : Params " + floatingButtonParams.x + " " + floatingButtonParams .y); break; case MotionEvent.ACTION_MOVE: floatingButtonParams.x = (int) (lastX - mTouchStartX); floatingButtonParams.y = (int) (lastY - mTouchStartY); Log.d(TAG, "onTouch move : m " + mTouchStartX + " " + mTouchStartY); Log.d(TAG, "onTouch move : last " + lastX + " " + lastY); Log.d(TAG, "onTouch move : start " + startPositionX + " " + startPositionY); Log.d(TAG, "onTouch move : Params " + floatingButtonParams.x + " " + floatingButtonParams .y); windowManager.updateViewLayout(floatingButtonView, floatingButtonParams); break; case MotionEvent.ACTION_UP: Log.d(TAG, "onTouch up : m " + mTouchStartX + " " + mTouchStartY); Log.d(TAG, "onTouch up : last " + lastX + " " + lastY); Log.d(TAG, "onTouch up : start " + startPositionX + " " + startPositionY); Log.d(TAG, "onTouch up : Params " + floatingButtonParams.x + " " + floatingButtonParams.y); if (Math.abs(floatingButtonParams.x - startPositionX) < 20 && Math.abs(floatingButtonParams.y - startPositionY) < 20) { Toast.makeText(MainActivity.this, "click", Toast.LENGTH_LONG); } break; } return false; } }); } @Override public void onWindowFocusChanged(boolean hasFocus) { super.onWindowFocusChanged(hasFocus); Point size = new Point(); windowManager.getDefaultDisplay().getSize(size); contentWidth = size.x; contentHeight = size.y; Rect rect = new Rect(); getWindow().getDecorView().getWindowVisibleDisplayFrame(rect); top = rect.top; Log.d(TAG, "onWindowFocusChanged: " + contentWidth + " " + contentHeight + " " + top); }}
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以上代码主要参考了这篇博客
【【Android Demo】悬浮窗体实现】http://www.cnblogs.com/yc-755909659/p/4281214.html。
这篇博客【android悬浮窗口的实现】http://blog.csdn.net/stevenhu_223/article/details/8504058也是关于悬浮窗的，里面有源码分析，讲的更深入一些，还没来得及学习。
但是上述代码有点问题，如果将悬浮窗的初始位置设为Gravity.CENTER，在拖动的最开始会有个抖动。如果将主题设为没有title的主题，然后出去界面的宽高，在拖动的时候减去宽高的一半，则没有抖动。可是加上有title的主题后，会有微小的抖动。这一bug暂未修复。
为什么悬浮窗的属性要设置成TYPE_TOAST，请看这里
1、使用 type 值为 WindowManager.LayoutParams.TYPE_PHONE 和 WindowManager.LayoutParams.TYPE_SYSTEM_ALERT 需要申请 android.permission.SYSTEM_ALERT_WINDOW 权限，否则无法显示，报错：
E/AndroidRuntime: android.view.WindowManagerBadTokenException:Unabletoaddwindowandroid.view.ViewRootW@b64b5458 – permission denied for this window type
2、type 值为 WindowManager.LayoutParams.TYPE_TOAST 显示的 System overlay view 不需要权限，即可在任何平台显示。
但仅在 API level >= 19 时可以达到目的。API level 19 以下因无法接收无法接收触摸（点击)和按键事件，故无法达到目的。
3、对于 API level < 19 的机器（MIUI除外），想要达到目的，需要:
要有 android.permission.SYSTEM_ALERT_WINDOW 权限
将 type 设置为 WindowManager.LayoutParams.TYPE_PHONE 或者 WindowManager.LayoutParams.TYPE_SYSTEM_ALERT
具体参考如下两篇博客
Android悬浮窗的小结：http://liaohuqiu.net/cn/posts/android-windows-manager/
Android悬浮窗TYPE_TOAST小结: 源码分析：http://www.jianshu.com/p/634cd056b90c
