添加悬浮窗，增加app权重，避免后台不允许访问网络。避免app被杀

app/build.gradle

@@ -37,7 +37,10 @@ android {
     lintOptions {
         abortOnError false
     }
-
+    compileOptions {
+        targetCompatibility JavaVersion.VERSION_1_8
+        sourceCompatibility JavaVersion.VERSION_1_8
+    }
     packagingOptions {
         exclude 'META-INF/INDEX.LIST'
         exclude 'META-INF/io.netty.versions.properties'
@@ -53,4 +56,12 @@ dependencies {
     implementation 'commons-io:commons-io:2.6'
     implementation "com.virjar.majora:majora-sdk:1.0"
 
+
+    // 权限请求框架：https://github.com/getActivity/XXPermissions
+    implementation 'com.github.getActivity:XXPermissions:11.6'
+
+
+    // 悬浮窗框架：https://github.com/getActivity/XToast
+    implementation 'com.github.getActivity:XToast:8.1'
+
 }

app/src/main/AndroidManifest.xml

@@ -3,6 +3,16 @@
     xmlns:tools="http://schemas.android.com/tools"
     package="com.virjar.majora.adr">
 
+    <uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" />
+    <uses-permission android:name="android.permission.SYSTEM_OVERLAY_WINDOW" />
+    <uses-permission android:name="android.permission.READ_PHONE_STATE" />
+
+    <!-- 前台服务，保持安排的优先级 -->
+    <uses-permission android:name="android.permission.FOREGROUND_SERVICE" />
+
+    <uses-permission android:name="android.permission.INTERNET" />
+
+
     <application
         android:name=".TheApp"
         android:allowBackup="false"
@@ -26,11 +36,6 @@
             android:enabled="true"
             android:exported="false" />
     </application>
-    <uses-permission android:name="android.permission.READ_PHONE_STATE" />
-
-    <!-- 前台服务，保持安排的优先级 -->
-    <uses-permission android:name="android.permission.FOREGROUND_SERVICE" />
 
-    <uses-permission android:name="android.permission.INTERNET" />
 
 </manifest>
\ No newline at end of file

app/src/main/java/com/virjar/majora/adr/MainActivity.java

 package com.virjar.majora.adr;
 
 import android.app.Activity;
+import android.content.Context;
 import android.os.Bundle;
+import android.view.Gravity;
 import android.view.View;
 import android.widget.Button;
 
+import com.hjq.permissions.OnPermissionCallback;
+import com.hjq.permissions.Permission;
+import com.hjq.permissions.XXPermissions;
+import com.hjq.xtoast.XToast;
+import com.hjq.xtoast.draggable.SpringDraggable;
+
+import java.util.List;
+
 public class MainActivity extends Activity {
 
 
@@ -22,7 +32,39 @@ public class MainActivity extends Activity {
                 SettingsActivity.go(MainActivity.this);
             }
         });
+
+        showRatelFloatWindow();
     }
 
 
+    /**
+     * 设置一个应用外悬浮窗，因为安卓10之后对后台启动activity具有限制
+     * https://developer.android.com/guide/components/activities/background-starts
+     * <p>
+     * {@link TheApp#checkFloatPermission(Context) 需要授予悬浮窗权限} (Context)}，
+     * {@link TheApp#canBackgroundStart(Context) 或者miui等在设置中给予后台启动Activity权限}
+     */
+    private void showRatelFloatWindow() {
+        XXPermissions.with(this)
+                .permission(Permission.SYSTEM_ALERT_WINDOW)
+                .request(new OnPermissionCallback() {
+
+                    @Override
+                    public void onGranted(List<String> granted, boolean all) {
+                        // 传入 Application 表示这个是一个全局的 Toast
+                        new XToast<>(TheApp.getApplication())
+                                .setView(R.layout.toast_phone)
+                                .setGravity(Gravity.END | Gravity.BOTTOM)
+                                .setYOffset(200)
+                                // 设置指定的拖拽规则
+                                .setDraggable(new SpringDraggable())
+                                .show();
+                    }
+
+                    @Override
+                    public void onDenied(List<String> denied, boolean never) {
+
+                    }
+                });
+    }
 }

app/src/main/java/com/virjar/majora/adr/TheApp.java

 package com.virjar.majora.adr;
 
+import android.app.AppOpsManager;
 import android.app.Application;
+import android.content.Context;
+import android.content.Intent;
+import android.os.Binder;
+import android.os.Build;
+import android.os.Process;
+import android.provider.Settings;
+import android.widget.Toast;
+
+import com.virjar.majora.client.sdk.log.MajoraLogger;
+
+import java.lang.reflect.Field;
+import java.lang.reflect.Method;
 
 public class TheApp extends Application {
     private static TheApp theApp;
@@ -14,7 +27,67 @@ public class TheApp extends Application {
         super.onCreate();
         theApp = this;
         KeepAliveService.startService(this);
+
+        if (!checkFloatPermission(this)) {
+            MajoraLogger.getLogger().info("请给软件设置悬浮窗权限，否则可能影响后台网络！");
+            Toast.makeText(getApplicationContext(), "请给软件设置悬浮窗权限，否则可能影响后台网络！", Toast.LENGTH_SHORT).show();
+            if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.M) {
+                Intent intent = new Intent(Settings.ACTION_MANAGE_OVERLAY_PERMISSION);
+                startActivity(intent);
+            }
+        }
+
+        if (!canBackgroundStart(this)) {
+            Toast.makeText(getApplicationContext(), "请给软件设置允许后台启动页面权限，否则可能影响后台网络！", Toast.LENGTH_SHORT).show();
+        }
     }
 
+    private boolean checkFloatPermission(Context context) {
+        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.M) {
+            try {
+                Class cls = Class.forName("android.content.Context");
+                Field declaredField = cls.getDeclaredField("APP_OPS_SERVICE");
+                declaredField.setAccessible(true);
+                Object obj = declaredField.get(cls);
+                if (!(obj instanceof String)) {
+                    return false;
+                }
+                String str2 = (String) obj;
+                obj = cls.getMethod("getSystemService", String.class).invoke(context, str2);
+                cls = Class.forName("android.app.AppOpsManager");
+                Field declaredField2 = cls.getDeclaredField("MODE_ALLOWED");
+                declaredField2.setAccessible(true);
+                Method checkOp = cls.getMethod("checkOp", Integer.TYPE, Integer.TYPE, String.class);
+                int result = (Integer) checkOp.invoke(obj, 24, Binder.getCallingUid(), context.getPackageName());
+                return result == declaredField2.getInt(cls);
+            } catch (Exception e) {
+                return false;
+            }
+        } else {
+            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
+                AppOpsManager appOpsMgr = (AppOpsManager) context.getSystemService(Context.APP_OPS_SERVICE);
+                if (appOpsMgr == null)
+                    return false;
+                int mode = appOpsMgr.checkOpNoThrow("android:system_alert_window", android.os.Process.myUid(), context
+                        .getPackageName());
+                return mode == AppOpsManager.MODE_ALLOWED || mode == AppOpsManager.MODE_IGNORED;
+            } else {
+                return Settings.canDrawOverlays(context);
+            }
+        }
+    }
 
+    private boolean canBackgroundStart(Context context) {
+        AppOpsManager ops = (AppOpsManager) context.getSystemService(Context.APP_OPS_SERVICE);
+        try {
+            int op = 10021; // >= 23
+            // ops.checkOpNoThrow(op, uid, packageName)
+            Method method = ops.getClass().getMethod("checkOpNoThrow", int.class, int.class, String.class);
+            Integer result = (Integer) method.invoke(ops, op, Process.myUid(), context.getPackageName());
+            return result == AppOpsManager.MODE_ALLOWED;
+        } catch (Exception e) {
+            MajoraLogger.getLogger().info("not support exec checkOpNoThrow", e);
+            return true;
+        }
+    }
 }

app/src/main/res/layout/toast_phone.xml

+<?xml version="1.0" encoding="utf-8"?>
+<ImageView xmlns:android="http://schemas.android.com/apk/res/android"
+    android:id="@android:id/icon"
+    android:layout_width="60dp"
+    android:layout_height="60dp"
+    android:src="@mipmap/ic_launcher" />
\ No newline at end of file

build.gradle

@@ -45,6 +45,11 @@ allprojects {
                 url "https://maven.aliyun.com/repository/google"
             }
             maven {
+                name "aliyunJCenter"
+                url "https://maven.aliyun.com/repository/jcenter"
+            }
+            maven { url 'https://jitpack.io' }
+            maven {
                 name "IntMaven"
                 url "http://nexus.virjar.com/repository/maven-public/"
             }
@@ -55,8 +60,3 @@ allprojects {
 task clean(type: Delete) {
     delete rootProject.buildDir
 }
-
-ext {
-    ratelEngineVersionCode = 5
-    ratelEngineVersion = "1.2.2"
-}
\ No newline at end of file