assistant-android/app/src/main/java/com/gh/common/util/RunningUtils.java

package com.gh.common.util;

import android.Manifest;
import android.app.ActivityManager;
import android.app.ActivityManager.RunningAppProcessInfo;
import android.app.ActivityManager.RunningTaskInfo;
import android.content.ComponentName;
import android.content.Context;
import android.support.annotation.RequiresPermission;

import java.util.List;

public class RunningUtils {

    /**
     * 判断当前应用程序处于前台还是后台
     */
    @RequiresPermission(Manifest.permission.GET_TASKS)
    public static boolean isApplicationBroughtToBackground(Context context) {
        ActivityManager am = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
        List<RunningTaskInfo> tasks = am.getRunningTasks(1);
        if (!tasks.isEmpty()) {
            ComponentName topActivity = tasks.get(0).topActivity;
            if (!topActivity.getPackageName().equals(context.getPackageName())) {
                return true;
            }
        }
        return false;

    }

    /**
     * 判断当前应用程序处于前台还是后台
     */
    public static boolean isBackground(Context context) {
        ActivityManager activityManager = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
        List<RunningAppProcessInfo> appProcesses = activityManager.getRunningAppProcesses();
        for (RunningAppProcessInfo appProcess : appProcesses) {
            if (appProcess.processName.equals(context.getPackageName())) {
                if (appProcess.importance == RunningAppProcessInfo.IMPORTANCE_BACKGROUND) {
                    return true;
                } else {
                    return false;
                }
            }
        }
        return false;
    }

    /**
     * 判断当前topactivity是否与传入的相同
     */
    @RequiresPermission(Manifest.permission.GET_TASKS)
    public static boolean isEqualsTop(Context context, String activityName) {
        ActivityManager activityManager = (ActivityManager) context
                .getSystemService(Context.ACTIVITY_SERVICE);
        List<RunningTaskInfo> infos = activityManager.getRunningTasks(100);
        for (RunningTaskInfo info : infos) {
            if (info.topActivity.getClassName().equals(activityName)) {
                return true;
            }
        }
        return false;
    }

    /**
     * 判断当前baseActivity是否与传入的相同
     */
    @RequiresPermission(Manifest.permission.GET_TASKS)
    public static boolean isEqualsBase(Context context, String activityName) {
        ActivityManager activityManager = (ActivityManager) context
                .getSystemService(Context.ACTIVITY_SERVICE);
        List<RunningTaskInfo> infos = activityManager.getRunningTasks(100);
        for (RunningTaskInfo info : infos) {
            if (info.baseActivity.getClassName().equals(activityName)) {
                return true;
            }
        }
        return false;
    }

    /**
     * 判断应用是否正在运行
     */
    @RequiresPermission(Manifest.permission.GET_TASKS)
    public static boolean isRunning(Context context) {
        ActivityManager activityManager = (ActivityManager) context
                .getSystemService(Context.ACTIVITY_SERVICE);
        List<RunningTaskInfo> infos = activityManager.getRunningTasks(100);
        for (RunningTaskInfo info : infos) {
            if (info.topActivity.getPackageName().equals(context.getPackageName())
                    && info.baseActivity.getPackageName().equals(context.getPackageName())) {
                return true;
            }
        }
        return false;
    }

    /**
     * 获取当前baseActivity
     */
    @RequiresPermission(Manifest.permission.GET_TASKS)
    public static String getBaseActivity(Context context) {
        ActivityManager activityManager = (ActivityManager) context
                .getSystemService(Context.ACTIVITY_SERVICE);
        List<RunningTaskInfo> infos = activityManager.getRunningTasks(100);
        for (RunningTaskInfo info : infos) {
            if (info.baseActivity.getPackageName().equals(context.getPackageName())) {
                return info.baseActivity.getClassName();
            }
        }
        return null;
    }

    /**
     * 获取当前topActivity
     */
    @RequiresPermission(Manifest.permission.GET_TASKS)
    public static String getTopActivity(Context context) {
        ActivityManager activityManager = (ActivityManager) context
                .getSystemService(Context.ACTIVITY_SERVICE);
        List<RunningTaskInfo> infos = activityManager.getRunningTasks(100);
        for (RunningTaskInfo info : infos) {
            if (info.topActivity.getPackageName().equals(
                    context.getPackageName())) {
                return info.topActivity.getClassName();
            }
        }
        return null;
    }

}