ReflectUtil

package com.android.demo.lileidemo.utils;

import android.app.usage.UsageStats;
import android.util.Log;

import com.android.demo.lileidemo.MyApplication;
import com.android.demo.lileidemo.constant.AppConstants;

import java.lang.reflect.Field;
import java.util.List;

/**
 * date: 04/16/2020.
 * author: lilei.
 */
public class ReflectUtil {
    private static final String TAG = AppConstants.APP_TAG + "ReflectUtil ";

    private static UsageStats mUsageStats;
    private static String mPackageName;

    public static synchronized void testReflect() {
        long currentTimeMillis = System.currentTimeMillis();
        long hourStartMillis = DateTimeUtil.getHourStartMillis(currentTimeMillis);
        long startTimeMillis = 1586941200000L;//hourStartMillis - AppConstants.OPEN_APP_STATS_INTERVAL_MILLIS;
        long endTimeMillis = 1586941464278L;
        List<UsageStats> listUsageStats = UsageStatsUtil.getUsageStatsList(
            MyApplication.getAppContext(), startTimeMillis, endTimeMillis);

        for (int i = 0; i < listUsageStats.size(); i++) {
            mUsageStats = listUsageStats.get(i);
            getAppLaunchCount(mUsageStats);
            mPackageName = mUsageStats.getPackageName();
            long totalTimeInForeground = mUsageStats.getTotalTimeInForeground();
            Log.d(TAG, "collectAllOpenApp() mPackageName:" + mPackageName
                + " totalTimeInForeground:" + totalTimeInForeground
                + " getFirstTimeStamp：" + mUsageStats.getFirstTimeStamp()
                + " getLastTimeStamp:" + mUsageStats.getLastTimeStamp()
                + " getLastTimeUsed:" + mUsageStats.getLastTimeUsed()
                + " startTimeMillis:" + startTimeMillis + " endTimeMillis:" + endTimeMillis);
        }
    }

    private static void getAppLaunchCount(UsageStats usageStats) {
        Class<UsageStats> usageStatsClass = UsageStats.class;
        try {
            //step1 通过方法名称反射
//            Method method = usageStatsClass.getDeclaredMethod("getLastTimeUsed",
//                (Class[]) null);
//            //Open permission.
//            method.setAccessible(true);
//            Object lastTimeUsed = (Object) method.invoke(usageStats, (Object[]) null);
//


            //step2 通过变量名称反射
            Class c = usageStats.getClass();
            Field field = c.getDeclaredField("mLaunchCount");
            //Field field = usageStats.getClass().getDeclaredField("mAppLaunchCount");
            field.setAccessible(true);
            int launchCount = field.getInt(usageStats);

            field = c.getDeclaredField("mLastEvent");
            //Field field = usageStats.getClass().getDeclaredField("mAppLaunchCount");
            field.setAccessible(true);
            int lastEvent = field.getInt(usageStats);

            Log.d(TAG, "getAppLaunchCount() *# getPackageName:" + usageStats.getPackageName()
                + " lastEvent:" + lastEvent + " launchCount:" + launchCount);
        } catch (Exception e) {
            Log.d(TAG, "getAppLaunchCount() error:" + e.toString());
            e.printStackTrace();
        }
    }
}