<uses-permission
 android:name="android.permission.PACKAGE_USAGE_STATS"
 tools:ignore="ProtectedPermissions" />

Intent intent = new Intent(Settings.ACTION_USAGE_ACCESS_SETTINGS);
startActivityForResult(intent);

public final class UsageStatsManager {
 public static final int INTERVAL_BEST = 4; //根据提供的开始、结束时间决定时间间隔
 public static final int INTERVAL_DAILY = 0; //以天为时间间隔（最长7天）
 public static final int INTERVAL_MONTHLY = 2; //以月为时间间隔（最长6个月）
 public static final int INTERVAL_WEEKLY = 1; //以周为时间间隔（最长4个星期）
 public static final int INTERVAL_YEARLY = 3; //以年为时间间隔（最长2年）

 UsageStatsManager() {
 throw new RuntimeException("Stub!");
 }

 public List<UsageStats> queryUsageStats(int intervalType, long beginTime, long endTime) {
 throw new RuntimeException("Stub!");
 }

 public List<ConfigurationStats> queryConfigurations(int intervalType, long beginTime, long endTime) {
 throw new RuntimeException("Stub!");
 }

 public UsageEvents queryEvents(long beginTime, long endTime) {
 throw new RuntimeException("Stub!");
 }

 public Map<String, UsageStats> queryAndAggregateUsageStats(long beginTime, long endTime) {
 throw new RuntimeException("Stub!");
 }

 public boolean isAppInactive(String packageName) {
 throw new RuntimeException("Stub!");
 }
}

private void getTopApp() {
 UsageStatsManager mUsageStatsManager = (UsageStatsManager) getSystemService(Context.USAGE_STATS_SERVICE);//usagestats
 long time = System.currentTimeMillis();
 List<UsageStats> usageStatsList = mUsageStatsManager.queryUsageStats(UsageStatsManager.INTERVAL_BEST, time - 2000, time);

 if (usageStatsList != null && !usageStatsList.isEmpty()) {
  SortedMap<Long, UsageStats> usageStatsMap = new TreeMap<>();
  for (UsageStats usageStats : usageStatsList) {
  usageStatsMap.put(usageStats.getLastTimeUsed(), usageStats);
  }
  if (!usageStatsMap.isEmpty()) {
  String topPackageName = usageStatsMap.get(usageStatsMap.lastKey()).getPackageName();

  if (getLauncherPackageName(mContext).equals(topPackageName) || "com.othershe.test".equals(topPackageName)) {
   return;
  }

  Log.e("TopPackage Name", topPackageName);

  //模拟home键点击
  Intent intent = new Intent(Intent.ACTION_MAIN);
  intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
  intent.addCategory(Intent.CATEGORY_HOME);
  startActivity(intent);

  //启动提示页面
  Intent intent1 = new Intent(mContext, TipActivity.class);
  intent1.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
  startActivity(intent1);
  }
 }
 }

@Override
 public int onStartCommand(Intent intent, int flags, int startId) {

 mTimer = new Timer();
 TimerTask task = new TimerTask() {
  @Override
  public void run() {
  getTopApp();
  }
 };

 mTimer.schedule(task, 1000, 500);
 return super.onStartCommand(intent, flags, startId);
 }

private void getHistoryApps() {
 Calendar calendar = Calendar.getInstance();
 long endTime = calendar.getTimeInMillis();
 calendar.add(Calendar.YEAR, -1);
 long startTime = calendar.getTimeInMillis();

 UsageStatsManager mUsageStatsManager = (UsageStatsManager) getSystemService(Context.USAGE_STATS_SERVICE);
 List<UsageStats> usageStatsList = mUsageStatsManager.queryUsageStats(UsageStatsManager.INTERVAL_YEARLY, startTime, endTime);

 if (usageStatsList != null && !usageStatsList.isEmpty()) {
  HashSet<String> set = new HashSet<>();
  for (UsageStats usageStats : usageStatsList) {
  set.add(usageStats.getPackageName());
  }

  if (!set.isEmpty()) {
  Log.e("size", set.size() + "");
  }
 }
 }