在一些场合里，我们使用悬浮窗会有很大的便利，比如IOS系统的悬浮窗，360或者其他手机卫士的悬浮窗等等。
我们创造出两个悬浮窗，通过点击小悬浮窗打开或者关闭大悬浮窗。
代码如下：
在这之前，我们需要在manifest中申请权限：
<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" />
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并且，悬浮窗这个权限我们需要手动在手机找到应用权限管理，允许这个权限才行
小悬浮窗的界面代码float_normal_view.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/ll_float_normal"
android:gravity="center"
android:orientation="vertical">
<ImageView
android:id="@+id/iv_show_control_view"
android:layout_gravity="center"
android:background="@drawable/float_bg"
android:layout_width="65dp"
android:orientation="vertical"
android:alpha="0.3"
android:layout_height="65dp" >
</ImageView>
</LinearLayout>
大悬浮窗的界面代码float_window_big.xml：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/big_window_layout"
android:layout_width="200dip"
android:layout_height="100dip"
android:background="@android:color/holo_green_dark"
android:orientation="vertical"
>
<Button
android:id="@+id/close"
android:layout_width="100dip"
android:layout_height="40dip"
android:layout_gravity="center_horizontal"
android:layout_marginTop="12dip"
android:text="关闭悬浮窗"
/>
<Button
android:id="@+id/back"
android:layout_width="100dip"
android:layout_height="40dip"
android:layout_gravity="center_horizontal"
android:text="主页"
/>
</LinearLayout>
入口activity（MainActivity ）：
public class MainActivity extends Activity {
MyWindowManager myWindowManager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
if(!Settings.canDrawOverlays(getApplicationContext())) {
//启动Activity让用户授权
Intent intent = new Intent(Settings.ACTION_MANAGE_OVERLAY_PERMISSION);
intent.setData(Uri.parse("package:" + getPackageName()));
startActivityForResult(intent,100);
}
}
setContentView(R.layout.activity_main);
myWindowManager = MyWindowManager.getInstance();
myWindowManager.createNormalView(this.getApplicationContext());
}
}
悬浮窗管理器MyWindowManager:
public class MyWindowManager {
private FloatNormalView normalView;
private Context mContext;
private static MyWindowManager instance;
private WindowManager windowManager;
private MyWindowManager() {
}
public static MyWindowManager getInstance() {
if (instance == null)
instance = new MyWindowManager();
return instance;
}
private WindowManager getWindowManager(Context context) {
if (windowManager == null)
windowManager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
mContext=context;
return windowManager;
}
/**
* 判断小悬浮窗是否存在
*
* @return
*/
public boolean isNormalViewExists() {
return normalView != null;
}
/**
* 创建小型悬浮窗
*/
public void createNormalView(Context context) {
if (normalView == null) {
normalView = new FloatNormalView(context);
}
}
/**
* 移除悬浮窗
*
* @param context
*/
public void removeNormalView(Context context) {
if (normalView != null) {
windowManager.removeView(normalView);
normalView = null;
}
}
FloatWindowBigView bigWindow;
private WindowManager.LayoutParams bigWindowParams;
public void createBigWindow(Context context) {
WindowManager windowManager = getWindowManager(context);
int screenWidth = windowManager.getDefaultDisplay().getWidth();
int screenHeight = windowManager.getDefaultDisplay().getHeight();
if (bigWindow == null) {
bigWindow = new FloatWindowBigView(context);
if (bigWindowParams == null) {
bigWindowParams = new WindowManager.LayoutParams();
bigWindowParams.x = screenWidth / 2 - FloatWindowBigView.viewWidth / 2;
bigWindowParams.y = screenHeight / 2 - FloatWindowBigView.viewHeight / 2;
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
bigWindowParams.type =WindowManager.LayoutParams.TYPE_APPLICATION_OVERLAY;
}
else {
bigWindowParams.type = WindowManager.LayoutParams.TYPE_PHONE;
}
bigWindowParams.format = PixelFormat.RGBA_8888;
bigWindowParams.gravity = Gravity.LEFT | Gravity.TOP;
bigWindowParams.width = FloatWindowBigView.viewWidth;
bigWindowParams.height = FloatWindowBigView.viewHeight;
}
windowManager.addView(bigWindow, bigWindowParams);
}
}
public void removeBigWindow(Context context) {
if (bigWindow != null) {
WindowManager windowManager = getWindowManager(context);
windowManager.removeView(bigWindow);
bigWindow = null;
}
}
}
小悬浮窗FloatNormalView:
public class FloatNormalView extends LinearLayout implements View.OnTouchListener {
private final static String TAG="FloatNormalView";
/**
* 记录小悬浮窗的宽度
*/
public static int viewWidth;
/**
* 记录小悬浮窗的高度
*/
public static int viewHeight;
/**
* 记录系统状态栏的高度
*/
private static int statusBarHeight;
/**
* 用于更新小悬浮窗的位置
*/
private WindowManager windowManager;
/**
* 小悬浮窗的参数
*/
private WindowManager.LayoutParams mParams;
/**
* 记录当前手指位置在屏幕上的横坐标值
*/
private float xInScreen,xInitScreen;
/**
* 记录当前手指位置在屏幕上的纵坐标值
*/
private float yInScreen,yInitScreen;
/**
* 记录手指按下时在屏幕上的横坐标的值
*/
private float xDownInScreen;
/**
* 记录手指按下时在屏幕上的纵坐标的值
*/
private float yDownInScreen;
/**
* 记录手指按下时在小悬浮窗的View上的横坐标的值
*/
private float xInView;
/**
* 记录手指按下时在小悬浮窗的View上的纵坐标的值
*/
private float yInView;
public FloatNormalView(Context context) {
super(context);
windowManager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
LayoutInflater.from(context).inflate(R.layout.float_normal_view, this);
View view = findViewById(R.id.ll_float_normal);
viewWidth = view.getLayoutParams().width;
viewHeight = view.getLayoutParams().height;
initLayoutParams();
}
OnClickListener circleClickListener=new OnClickListener() {
@Override
public void onClick(View view) {
MyWindowManager.getInstance().createBigWindow(getContext());
MyWindowManager.getInstance().removeNormalView(getContext());
}
};
/**
* 初始化参数
*/
private void initLayoutParams() {
//屏幕宽高
int screenWidth = windowManager.getDefaultDisplay().getWidth();
int screenHeight = windowManager.getDefaultDisplay().getHeight();
mParams = new WindowManager.LayoutParams();
// FLAG_NOT_TOUCH_MODAL不阻塞事件传递到后面的窗口
// 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
mParams.flags = WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE
| WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL;
//悬浮窗默认显示的位置
mParams.gravity = Gravity.START | Gravity.TOP;
//指定位置
mParams.x = screenWidth - viewWidth * 2;
mParams.y = screenHeight / 2 + viewHeight * 2;
//悬浮窗的宽高
mParams.width = WindowManager.LayoutParams.WRAP_CONTENT;
mParams.height = WindowManager.LayoutParams.WRAP_CONTENT;
mParams.format = PixelFormat.TRANSPARENT;
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
mParams.type =WindowManager.LayoutParams.TYPE_APPLICATION_OVERLAY;
}
else {
mParams.type = WindowManager.LayoutParams.TYPE_PHONE;
}
mParams.type = WindowManager.LayoutParams.TYPE_APPLICATION_OVERLAY;
windowManager.addView(this, mParams);
}
@Override
public boolean onTouchEvent(MotionEvent event) {
Log.i(TAG,"hsz--->onTouchEvent:"+event.getAction());
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
// 手指按下时记录必要数据,纵坐标的值都需要减去状态栏高度
xInView =xInitScreen= event.getX();
yInView =yInitScreen= event.getY();
xDownInScreen = event.getRawX();
yDownInScreen = event.getRawY() - getStatusBarHeight();
xInScreen = event.getRawX();
yInScreen = event.getRawY() - getStatusBarHeight();
break;
case MotionEvent.ACTION_MOVE:
xInScreen = event.getRawX();
yInScreen = event.getRawY() - getStatusBarHeight();
// 手指移动的时候更新小悬浮窗的位置
updateViewPosition();
break;
case MotionEvent.ACTION_UP:
// 如果手指离开屏幕时，xDownInScreen和xInScreen相等，且yDownInScreen和yInScreen相等，则视为触发了单击事件。
if (xDownInScreen == xInScreen && yDownInScreen == yInScreen) {
openOrCloseControlView();
}
Float distanceX=event.getX()-xInitScreen;
Float distanceY=event.getY()-yInitScreen;
if(distanceX==0 && distanceY==0){
MyWindowManager.getInstance().createBigWindow(getContext());
MyWindowManager.getInstance().removeNormalView(getContext());
}
break;
default:
break;
}
return true;
}
/**
* 将小悬浮窗的参数传入，用于更新小悬浮窗的位置。
*
* @param params 小悬浮窗的参数
*/
public void setParams(WindowManager.LayoutParams params) {
mParams = params;
}
/**
* 更新小悬浮窗在屏幕中的位置。
*/
private void updateViewPosition() {
mParams.x = (int) (xInScreen - xInView);
mParams.y = (int) (yInScreen - yInView);
windowManager.updateViewLayout(this, mParams);
}
/**
* 用于获取状态栏的高度。
*
* @return 返回状态栏高度的像素值。
*/
private int getStatusBarHeight() {
if (statusBarHeight == 0) {
try {
Class<?> c = Class.forName("com.android.internal.R$dimen");
Object o = c.newInstance();
Field field = c.getField("status_bar_height");
int x = (Integer) field.get(o);
statusBarHeight = getResources().getDimensionPixelSize(x);
} catch (Exception e) {
e.printStackTrace();
}
}
return statusBarHeight;
}
@Override
public boolean onTouch(View v, MotionEvent event) {
return false;
}
}
大悬浮窗FloatWindowBigView：
public class FloatWindowBigView extends LinearLayout {
/**
* 记录大悬浮窗的宽度
*/
public static int viewWidth;
/**
* 记录大悬浮窗的高度
*/
public static int viewHeight;
public FloatWindowBigView(final Context context) {
super(context);
LayoutInflater.from(context).inflate(R.layout.float_window_big, this);
View view = findViewById(R.id.big_window_layout);
viewWidth = view.getLayoutParams().width;
viewHeight = view.getLayoutParams().height;
Button close = (Button) findViewById(R.id.close);
Button back = (Button) findViewById(R.id.back);
close.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// 点击关闭悬浮窗的时候
MyWindowManager.getInstance().removeBigWindow(context);
MyWindowManager.getInstance().createNormalView(context);
}
});
back.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// 点击主页的时候，移除大悬浮窗，创建小悬浮窗
Intent intent = new Intent(Intent.ACTION_MAIN);
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
intent.addCategory(Intent.CATEGORY_HOME);
context.startActivity(intent);
MyWindowManager.getInstance().removeBigWindow(context);
MyWindowManager.getInstance().createNormalView(context);
}
});
}
}
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