Android获取所有Activity

绝地灬酷狼 2023-10-07 18:16 66阅读 0赞

##### 1 方式一 #####

public void getAllActivity() {
        
            PackageManager packageManager = getPackageManager();
            PackageInfo packageInfo = null;
            try {
        
                packageInfo = packageManager.getPackageInfo(
                        getPackageName(), PackageManager.GET_ACTIVITIES);
                //所有的Activity 
                ActivityInfo[] activities = packageInfo.activities;
                for (ActivityInfo activity :activities ) {
        
                    Class<?> aClass = Class.forName(activity.name);
                }
    
            } catch (PackageManager.NameNotFoundException | ClassNotFoundException e) {
        
                e.printStackTrace();
            }
        }

##### 2 方式二 反射 #####

private static List<Activity> getActivitiesByApplication(Application application) {
        
            List<Activity> list = new ArrayList<>();
            try {
        
                Class<Application> applicationClass = Application.class;
                Field mLoadedApkField = applicationClass.getDeclaredField("mLoadedApk");
                mLoadedApkField.setAccessible(true);
                Object mLoadedApk = mLoadedApkField.get(application);
                Class<?> mLoadedApkClass = mLoadedApk.getClass();
                Field mActivityThreadField = mLoadedApkClass.getDeclaredField("mActivityThread");
                mActivityThreadField.setAccessible(true);
                Object mActivityThread = mActivityThreadField.get(mLoadedApk);
                Class<?> mActivityThreadClass = mActivityThread.getClass();
                Field mActivitiesField = mActivityThreadClass.getDeclaredField("mActivities");
                mActivitiesField.setAccessible(true);
                Object mActivities = mActivitiesField.get(mActivityThread);
                // 注意这里一定写成Map，低版本这里用的是HashMap，高版本用的是ArrayMap
                if (mActivities instanceof Map) {
        
                    @SuppressWarnings("unchecked")
                    Map<Object, Object> arrayMap = (Map<Object, Object>) mActivities;
                    for (Map.Entry<Object, Object> entry : arrayMap.entrySet()) {
        
                        Object value = entry.getValue();
                        Class<?> activityClientRecordClass = value.getClass();
                        Field activityField = activityClientRecordClass.getDeclaredField("activity");
                        activityField.setAccessible(true);
                        Object o = activityField.get(value);
                        list.add((Activity) o);
                    }
                }
            } catch (Exception e) {
        
                e.printStackTrace();
                list = null;
            }
            return list;
        }

##### 3 获取栈顶 Activity #####

//获取栈顶Activity及其所属进程
        public static String getTopActivityNameAndProcessName(Context context) {
        
            String processName = null;
            String topActivityName = null;
            ActivityManager activityManager =
                    (ActivityManager) (context.getSystemService(android.content.Context.ACTIVITY_SERVICE));
            List<ActivityManager.RunningTaskInfo> runningTaskInfos = activityManager.getRunningTasks(1);
            if (runningTaskInfos != null) {
        
                ActivityManager.RunningTaskInfo runningTaskInfo = runningTaskInfos.get(0);
                ComponentName f = runningTaskInfo.topActivity;
                String topActivityClassName = f.getClassName();
                String temp[] = topActivityClassName.split("\\.");
                //栈顶Activity的名称
                topActivityName = temp[temp.length - 1];
                int index = topActivityClassName.lastIndexOf(".");
                //栈顶Activity所属进程的名称
                processName = topActivityClassName.substring(0, index);
                System.out.println("---->topActivityName=" + topActivityName + ",processName=" + processName);
    
            }
            return topActivityName;
        }