android悬浮窗（支持退回桌面后显示）

1、需求

首先说一下需求吧，看看是不是你们想要的:
在IM音视频聊天页面，点击页面上的最小化按钮，将Activity最小化并开启一个悬浮窗，悬浮窗可拖动可点击，点击进入当前通话页面。

2、思路

1、听到开启悬浮窗，第一时间就想到了要开启一个Service，在Service中进行布局的设置及拖动、点击逻辑的设定。
2、通话界面点击最小化按钮，将Activity最小化并保持后台运行，同时开启Service展示悬浮窗

3、实现

1、创建FloatVideoWindowService继承Service类
2、实现父类抽象方法
3、在onCreate()中进行布局设置，并获得WindowManager对象。
4、在onStartCommand()方法中将布局、参数添加到WindowManager中
5、增加全局变量boolean isStarted记录悬浮窗是否已打开。
6、在onDestroy()中将布局从WindowManager中移除
7、在onStartCommand()中进行控件的点击、拖动监听
8、点击最小化按钮执行moveTaskToBack(true)，并启动Service，isStarted = true;
9、onRestart()中关闭Service;

以下是代码

Service.class


import android.app.Service;
import android.content.Context;
import android.content.Intent;
import android.graphics.Color;
import android.graphics.PixelFormat;
import android.os.Binder;
import android.os.Build;
import android.os.IBinder;
import android.os.SystemClock;
import android.provider.Settings;
import android.support.annotation.Nullable;
import android.util.Log;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.WindowManager;
import android.widget.Button;
import android.widget.TextView;public class FloatVideoWindowService extends Service {private WindowManager mWindowManager;private WindowManager.LayoutParams wmParams;private LayoutInflater inflater;public static boolean isStarted = false;//viewprivate View mFloatingLayout;    //布局View@Nullable@Overridepublic IBinder onBind(Intent intent) {return null;}@Overridepublic void onCreate() {super.onCreate();isStarted = true;initWindow();}@Overridepublic int onStartCommand(Intent intent, int flags, int startId) {showFloatingWindow();return super.onStartCommand(intent, flags, startId);}@Overridepublic void onDestroy() {super.onDestroy();if (mWindowManager != null) {mWindowManager.removeView(mFloatingLayout);isStarted = false;}}/*** 设置悬浮框基本参数（位置、宽高等）*/private void initWindow() {mWindowManager = (WindowManager) getSystemService(Context.WINDOW_SERVICE);wmParams = getParams();inflater = LayoutInflater.from(getApplicationContext());mFloatingLayout = inflater.inflate(R.layout.layout_window, null);}private WindowManager.LayoutParams getParams() {wmParams = new WindowManager.LayoutParams();if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {wmParams.type = WindowManager.LayoutParams.TYPE_APPLICATION_OVERLAY;} else {wmParams.type = WindowManager.LayoutParams.TYPE_SYSTEM_ALERT;}wmParams.format = PixelFormat.RGBA_8888;//设置可以显示在状态栏上wmParams.flags = WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL | WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE;wmParams.width = WindowManager.LayoutParams.WRAP_CONTENT;wmParams.height = WindowManager.LayoutParams.WRAP_CONTENT;//这是悬浮窗居中位置wmParams.gravity = Gravity.LEFT | Gravity.TOP;//70、210是我项目中的位置哦wmParams.x = 70;wmParams.y = 210;return wmParams;}private void showFloatingWindow() {if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {//判断系统版本if (Settings.canDrawOverlays(this)) {mFloatingLayout.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {Intent intent = new Intent(getApplicationContext(), VoiceCallActivity.class);startActivity(intent);}});mFloatingLayout.setOnTouchListener(new FloatingListener());mWindowManager.addView(mFloatingLayout, wmParams);}} else {mFloatingLayout.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {Intent intent = new Intent(getApplicationContext(), VoiceCallActivity.class);startActivity(intent);}});mFloatingLayout.setOnTouchListener(new FloatingListener());mWindowManager.addView(mFloatingLayout, wmParams);}}private int mTouchStartX, mTouchStartY, mTouchCurrentX, mTouchCurrentY;private int mStartX, mStartY, mStopX, mStopY;private boolean isMove;private class FloatingListener implements View.OnTouchListener {@Overridepublic boolean onTouch(View v, MotionEvent event) {int action = event.getAction();switch (action) {case MotionEvent.ACTION_DOWN:isMove = false;mTouchStartX = (int) event.getRawX();mTouchStartY = (int) event.getRawY();mStartX = (int) event.getX();mStartY = (int) event.getY();break;case MotionEvent.ACTION_MOVE:mTouchCurrentX = (int) event.getRawX();mTouchCurrentY = (int) event.getRawY();wmParams.x += mTouchCurrentX - mTouchStartX;wmParams.y += mTouchCurrentY - mTouchStartY;mWindowManager.updateViewLayout(mFloatingLayout, wmParams);mTouchStartX = mTouchCurrentX;mTouchStartY = mTouchCurrentY;break;case MotionEvent.ACTION_UP:mStopX = (int) event.getX();mStopY = (int) event.getY();if (Math.abs(mStartX - mStopX) >= 1 || Math.abs(mStartY - mStopY) >= 1) {isMove = true;}break;}return isMove;}}
}

Activity.class

private Intent serviceIntent;private static HomeWatcherReceiver mHomeKeyReceiver = null;public void openMinWindow() {if (!FloatVideoWindowService.isStarted) {if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {//判断系统版本if (!Settings.canDrawOverlays(this)) {Toast.makeText(this, "当前无权限，请授权", Toast.LENGTH_SHORT);startActivityForResult(new Intent(Settings.ACTION_MANAGE_OVERLAY_PERMISSION, Uri.parse("package:" + getPackageName())), 0);} else {serviceIntent = new Intent(VoiceCallActivity.this, FloatVideoWindowService.class);startService(serviceIntent);moveTaskToBack(true);}} else {serviceIntent = new Intent(VoiceCallActivity.this, FloatVideoWindowService.class);startService(serviceIntent);moveTaskToBack(true);}}}@Overrideprotected void onActivityResult(int requestCode, int resultCode, Intent data) {if (requestCode == 0) {if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {if (!Settings.canDrawOverlays(this)) {Toast.makeText(this, "授权失败", Toast.LENGTH_SHORT).show();} else {Toast.makeText(this, "授权成功", Toast.LENGTH_SHORT).show();serviceIntent = new Intent(VoiceCallActivity.this, FloatVideoWindowService.class);startService(serviceIntent);moveTaskToBack(true);}}}}@Overrideprotected void onRestart() {super.onRestart();if (serviceIntent != null) {stopService(serviceIntent);}}//以下为Home键监听，最小化到桌面时也让悬浮窗启动@Subscribepublic void onEvent(String event) {if (event.equals("startService")) {openMinWindow();}}@Overrideprotected void onResume() {super.onResume();registerHomeKeyReceiver(this);}@Overrideprotected void onPause() {super.onPause();unregisterHomeKeyReceiver(this);}private static void registerHomeKeyReceiver(Context context) {mHomeKeyReceiver = new HomeWatcherReceiver();final IntentFilter homeFilter = new IntentFilter(Intent.ACTION_CLOSE_SYSTEM_DIALOGS);context.registerReceiver(mHomeKeyReceiver, homeFilter);}private static void unregisterHomeKeyReceiver(Context context) {if (null != mHomeKeyReceiver) {context.unregisterReceiver(mHomeKeyReceiver);}}

HomeWatcherReceiver.class （手机底部按键监听）

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.util.Log;
import de.greenrobot.event.EventBus;/*** PROJECT_NAME:meteor_dog_android* Created by ENZO on 2018/10/19,16:18* Description: Home键监听*/public class HomeWatcherReceiver extends BroadcastReceiver {private static final String LOG_TAG = "HomeReceiver";private static final String SYSTEM_DIALOG_REASON_KEY = "reason";private static final String SYSTEM_DIALOG_REASON_RECENT_APPS = "recentapps";private static final String SYSTEM_DIALOG_REASON_HOME_KEY = "homekey";private static final String SYSTEM_DIALOG_REASON_LOCK = "lock";private static final String SYSTEM_DIALOG_REASON_ASSIST = "assist";@Overridepublic void onReceive(Context context, Intent intent) {String action = intent.getAction();Log.i(LOG_TAG, "onReceive: action: " + action);if (action.equals(Intent.ACTION_CLOSE_SYSTEM_DIALOGS)) {String reason = intent.getStringExtra(SYSTEM_DIALOG_REASON_KEY);Log.i(LOG_TAG, "reason: " + reason);if (SYSTEM_DIALOG_REASON_HOME_KEY.equals(reason)) {//发送通知，启动ServiceEventBus.getDefault().post("startService");}else if (SYSTEM_DIALOG_REASON_RECENT_APPS.equals(reason)) {// 长按Home键 或者 activity切换键}else if (SYSTEM_DIALOG_REASON_LOCK.equals(reason)) {// 锁屏}else if (SYSTEM_DIALOG_REASON_ASSIST.equals(reason)) {// samsung 长按Home键}}}}

4、注意

4.1: Service记得在AndroidManifest.xml中注册哦

4.2: 6.0以上（23）判断是否有悬浮窗权限请用Settings.canDrawOverlays(this)方法

4.3: 需要添加权限 android.permission.SYSTEM_ALERT_WINDOW

4.4: Eventbus记得解除注册啊！！我深有体会[尴尬]

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