Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
import android.app.Activity;

import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.util.Map;

public class Main {
    public static Activity getCurrentTopActivity()
            throws ClassNotFoundException, IllegalArgumentException, SecurityException, IllegalAccessException,
            InvocationTargetException, NoSuchMethodException, NoSuchFieldException {
        Class<?> activityThreadClass = Class.forName("android.app.ActivityThread");
        Object activityThread = activityThreadClass.getMethod("currentActivityThread").invoke(null);
        Field activitiesField = activityThreadClass.getDeclaredField("mActivities");
        activitiesField.setAccessible(true);
        Map<?, ?> activities = (Map<?, ?>) activitiesField.get(activityThread);
        for (Object activityRecord : activities.values()) {
            Class<?> activityRecordClass = activityRecord.getClass();
            Field pausedField = activityRecordClass.getDeclaredField("paused");
            pausedField.setAccessible(true);
            if (!pausedField.getBoolean(activityRecord)) {
                Field activityField = activityRecordClass.getDeclaredField("activity");
                activityField.setAccessible(true);
                Activity activity = (Activity) activityField.get(activityRecord);
                return activity;
            }
        }
        return null;
    }
}