Android获取栈顶的应用包名方法

ActivityManager manager = (ActivityManager) getApplicationContext().getSystemService(ACTIVITY_SERVICE);String currentClassName = manager.getRunningTasks(1).get(0).topActivity.getPackageName();

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

public class ForegroundAppUtil { private static final long END_TIME = System.currentTimeMillis(); private static final long TIME_INTERVAL = 7 * 24 * 60 * 60 * 1000L; private static final long START_TIME = END_TIME - TIME_INTERVAL; /**  * 获取栈顶的应用包名  */ public static String getForegroundActivityName(Context context) {  String currentClassName = "";  if (Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP) {   ActivityManager manager = (ActivityManager) context.getApplicationContext().getSystemService(Context.ACTIVITY_SERVICE);   currentClassName = manager.getRunningTasks(1).get(0).topActivity.getPackageName();  } else {   UsageStats initStat = getForegroundUsageStats(context, START_TIME, END_TIME);   if (initStat != null) {    currentClassName = initStat.getPackageName();   }  }  return currentClassName; } /**  * 判断当前应用是否在前台  */ public static boolean isForegroundApp(Context context) {  return TextUtils.equals(getForegroundActivityName(context), context.getPackageName()); } /**  * 获取时间段内，  */ public static long getTotleForegroundTime(Context context) {  UsageStats usageStats = getCurrentUsageStats(context, START_TIME, END_TIME);  if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {   return usageStats != null ? usageStats.getTotalTimeInForeground() : 0;  }  return 0; } /**  * 获取记录前台应用的UsageStats对象  */ private static UsageStats getForegroundUsageStats(Context context, long startTime, long endTime) {  UsageStats usageStatsResult = null;  if (android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {   List<UsageStats> usageStatses = getUsageStatsList(context, startTime, endTime);   if (usageStatses == null || usageStatses.isEmpty()) return null;   for (UsageStats usageStats : usageStatses) {    if (usageStatsResult == null || usageStatsResult.getLastTimeUsed() < usageStats.getLastTimeUsed()) {     usageStatsResult = usageStats;    }   }  }  return usageStatsResult; } /**  * 获取记录当前应用的UsageStats对象  */ public static UsageStats getCurrentUsageStats(Context context, long startTime, long endTime) {  if (android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {   List<UsageStats> usageStatses = getUsageStatsList(context, startTime, endTime);   if (usageStatses == null || usageStatses.isEmpty()) return null;   for (UsageStats usageStats : usageStatses) {    if (TextUtils.equals(usageStats.getPackageName(), context.getPackageName())) {     return usageStats;    }   }  }  return null; } /**  * 通过UsageStatsManager获取List<UsageStats>集合  */ public static List<UsageStats> getUsageStatsList(Context context, long startTime, long endTime) {  if (android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {   UsageStatsManager manager = (UsageStatsManager) context.getApplicationContext().getSystemService(Context.USAGE_STATS_SERVICE);   //UsageStatsManager.INTERVAL_WEEKLY，UsageStatsManager的参数定义了5个，具体查阅源码   List<UsageStats> usageStatses = manager.queryUsageStats(UsageStatsManager.INTERVAL_BEST, startTime, endTime);   if (usageStatses == null || usageStatses.size() == 0) {// 没有权限，获取不到数据    Intent intent = new Intent(Settings.ACTION_USAGE_ACCESS_SETTINGS);    intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);    context.getApplicationContext().startActivity(intent);    return null;   }   return usageStatses;  }  return null; }}

public class MainActivity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) {  super.onCreate(savedInstanceState);  setContentView(R.layout.activity_main);  startService(new Intent(getApplicationContext(),MyService.class)); }}

public class MyService extends Service { @Override public IBinder onBind(Intent intent) {  return null; } private Handler handler = new Handler(); private Runnable r = new Runnable() {  @Override  public void run() {   String foregroundActivityName = ForegroundAppUtil.getForegroundActivityName(getApplicationContext());   Toast.makeText(getApplicationContext(), foregroundActivityName, Toast.LENGTH_SHORT).show();   handler.postDelayed(r, 5000);  } }; @Override public void onCreate() {  super.onCreate(); } @Override public int onStartCommand(Intent intent, int flags, int startId) {  handler.postDelayed(r, 5000);  return START_STICKY; }}

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