How to make app locker in android studio source code
In this article , you will learn how to create basic app locker for android studio and which support on all apis including Oreo because when I was creating app locker I found almost all tutorials and website are useless they are not provide actual thing and some are providing with code that only supports on lower apis. In this article you will found app locker that will be supported on all apis with source code. First of all lets clear the basic logic, to create app locker you need to consider 5 things
- Usage Stats Services
- Background Services
- Broadcast Receiver
- Sqlite Database
- Lock Screen
Download Demo of this app from play store
Implementation of App locker in Android Studio
1. Restart Service:
This is board cast receiver class. It is called when you restart your mobile device and it restart background services
import android.content.BroadcastReceiver; import android.content.Context; import android.content.Intent; import android.os.Build; import android.util.Log; public class RestartService extends BroadcastReceiver { @Override public void onReceive(Context context, Intent intent) { if (intent.getAction().equals(Intent.ACTION_BOOT_COMPLETED)) { Log.i("Broadcast Listened", "Service tried to stop"); //Toast.makeText(context, "Service restarted", Toast.LENGTH_SHORT).show(); if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) { context.startForegroundService(new Intent(context, BackgroundServices.class)); } else { context.startService(new Intent(context, BackgroundServices.class)); } // context.startService(new Intent(context.getApplicationContext(), NotificationService.class)); } Log.i("Broadcast Listened", "Service tried to stop"); //Toast.makeText(context, "Service restarted", Toast.LENGTH_SHORT).show(); if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) { context.startForegroundService(new Intent(context, BackgroundServices.class)); } else { context.startService(new Intent(context, BackgroundServices.class)); } } }
2. Background Service:
import android.app.ActivityManager; import android.app.Notification; import android.app.NotificationChannel; import android.app.NotificationManager; import android.app.Service; import android.app.usage.UsageStats; import android.app.usage.UsageStatsManager; import android.content.BroadcastReceiver; import android.content.Context; import android.content.Intent; import android.database.Cursor; import android.graphics.Color; import android.os.Build; import android.os.IBinder; import androidx.annotation.Nullable; import androidx.annotation.RequiresApi; import androidx.core.app.NotificationCompat; import android.util.Log; import java.util.ArrayList; import java.util.List; import java.util.SortedMap; import java.util.Timer; import java.util.TimerTask; import java.util.TreeMap; public class BackgroundServices extends Service { private BroadcastReceiver receiver; public int counter=0; LockScreen obj = new LockScreen(); // context is important // every gui or view or activity have context
// i will use context of NotificationService class
Context mContext; // database class
Apply_password_on_AppDatabase db = new Apply_password_on_AppDatabase(this); // flag is used for stopping or running loop check of
// current app running
static int flag = 0 ; static int flag2 = 0; // when any app is lanuch and it have password set on it
// that app name save in current_app varaible
String current_app = ""; public BackgroundServices (){} @Override public void onCreate() { super.onCreate(); // add context of NotificationService to mContext variable
mContext = this; // oreo used different approach for background services
// other use same approach if (Build.VERSION.SDK_INT > Build.VERSION_CODES.O) startMyOwnForeground(); else startForeground(1, new Notification()); } // oreo api approach @RequiresApi(Build.VERSION_CODES.O) private void startMyOwnForeground() { String NOTIFICATION_CHANNEL_ID = "example.permanence"; String channelName = "Background Service"; NotificationChannel chan =
new NotificationChannel(NOTIFICATION_CHANNEL_ID, channelName, NotificationManager.IMPORTANCE_NONE);
chan.setLightColor(Color.BLUE); chan.setLockscreenVisibility(Notification.VISIBILITY_PRIVATE); NotificationManager manager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE); assert manager != null; manager.createNotificationChannel(chan); NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(this, NOTIFICATION_CHANNEL_ID); Notification notification = notificationBuilder.setOngoing(true) .setContentTitle("App is running in background") .setPriority(NotificationManager.IMPORTANCE_MIN) .setCategory(Notification.CATEGORY_SERVICE) .build(); startForeground(2, notification); } @Override public int onStartCommand(Intent intent, int flags, int startId) { super.onStartCommand(intent, flags, startId); startTimer(); return START_STICKY; } @Override public void onDestroy() { super.onDestroy(); stoptimertask(); Intent broadcastIntent = new Intent(); broadcastIntent.setAction("restartservice"); broadcastIntent.setClass(this, RestartService.class); this.sendBroadcast(broadcastIntent); } // set timer of one second repeat itself private Timer timer; private TimerTask timerTask; public void startTimer() { timer = new Timer(); timerTask = new TimerTask() { public void run() { if (flag == 0) { // get data from database
Cursor res = db.getAllData();
// create two list of name or pass
ArrayList<String> name = new ArrayList<String>();
ArrayList<String> pass = new ArrayList<String>(); while (res.moveToNext()) { // add data to list
Log.i("Count", "========= " + printForegroundTask());
name.add(res.getString(0));
pass.add(res.getString(1)); } // if current app have password set on it
// lanuch lock screen if (name.contains(printForegroundTask())) { // flag = 1 means stop loop flag = 1; current_app = printForegroundTask(); Intent lockIntent = new Intent(mContext, LockScreen.class); lockIntent.putExtra("name", pass.get(name.indexOf(printForegroundTask()))); lockIntent.putExtra("pack", printForegroundTask()); lockIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK); mContext.startActivity(lockIntent); } } if ((!printForegroundTask().equals("com.example.simpleapplocker")) && flag2 == 0 ) { if ((!printForegroundTask().equals(current_app))) { flag = 0; } } // if security provider is running // then dont lanuch lock screen
// only one time lock screen will appear
if (printForegroundTask().equals("com.example.simpleapplocker")) { flag = 2; } // Log.i("Count", "========= "+ printForegroundTask()); } }; timer.schedule(timerTask, 0, 100); // } public void stoptimertask() { if (timer != null) { timer.cancel(); timer = null; } } @Nullable @Override public IBinder onBind(Intent intent) { return null; } // get string of current app running private String printForegroundTask() { String currentApp = "NULL"; if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) { UsageStatsManager usm = (UsageStatsManager) this.getSystemService(Context.USAGE_STATS_SERVICE); long time = System.currentTimeMillis(); List<UsageStats> appList = usm.queryUsageStats(UsageStatsManager.INTERVAL_DAILY, time - 1000*1000, time); if (appList != null && appList.size() > 0) { SortedMap<Long, UsageStats> mySortedMap = new TreeMap<Long, UsageStats>(); for (UsageStats usageStats : appList) { mySortedMap.put(usageStats.getLastTimeUsed(), usageStats); } if (mySortedMap != null && !mySortedMap.isEmpty()) { currentApp = mySortedMap.get(mySortedMap.lastKey()).getPackageName(); } } } else { ActivityManager am = (ActivityManager)this.getSystemService(Context.ACTIVITY_SERVICE); List<ActivityManager.RunningAppProcessInfo> tasks = am.getRunningAppProcesses(); currentApp = tasks.get(0).processName; } // Log.e("AppLockerService", "Current App in foreground is: " + currentApp);
return currentApp; } }