package com.handheldgroup.fullfocus;

import android.app.Activity;
import android.app.ActivityManager;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.view.KeyEvent;

import java.lang.reflect.Method;

/*
This Activity prevents the user form exiting the Activity as well as preventing access to the OS itself

 - onPause is overridden to prevent other apps from gaining focus on top of this app
 - onWindowFocusChanged is overridden to bring focus back to this app if its lost to recent or other system windows
 - onWindowFocusChanged is also used to detect if the StatusBar is opened an forces it back to collapse
 - onKeyDown is overridden to prevent the BACK-Key from triggering the app to close

*/

public class FullFocusActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_my);
    }

    @Override
    public void onPause() {
        super.onPause();

        // Prevent a different Activity (from different package)  to come to front
        // Eg. the users tries to open the option on a keyboard
        ActivityManager activityManager =
                (ActivityManager) getApplicationContext().getSystemService(Context.ACTIVITY_SERVICE);
        activityManager.moveTaskToFront(getTaskId(), 0);
    }

    public void onWindowFocusChanged(boolean hasFocus) {
        if (!hasFocus) {
            // Close the recent apps and power dialog
            Intent closeDialog = new Intent(Intent.ACTION_CLOSE_SYSTEM_DIALOGS);
            sendBroadcast(closeDialog);

            // Collapse the StatusBar (NotificationBar) when pulled down
            // NOTE: Requires "<uses-permission android:name="android.permission.EXPAND_STATUS_BAR"/>"
            // to be added to the apps manifest xml file (outside the application tag)
            try {
                Object service = getSystemService("statusbar");
                Class<?> statusbarManager = Class.forName("android.app.StatusBarManager");
                Method collapse = statusbarManager.getMethod("collapse");
                collapse.setAccessible(true);
                collapse.invoke(service);
            } catch (Exception ex) {
            }
        }
    }

    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        // Consume the BACK-Key to the user can't exit the app
        // NOTE: This should only be used on the "Main Activity" or will require a more complex code
        // to allow normal navigation within the app itself
        if(keyCode == KeyEvent.KEYCODE_BACK ){
            return true;
        }
        return super.onKeyDown(keyCode, event);
    }
}