MainActivity.kt 5.48 KB
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package io.eelo.appinstaller

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import android.annotation.SuppressLint
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import android.content.pm.PackageManager
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import android.os.Bundle
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import android.support.design.internal.BottomNavigationItemView
import android.support.design.internal.BottomNavigationMenuView
import android.support.design.widget.BottomNavigationView
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import android.support.design.widget.Snackbar
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import android.support.v4.app.Fragment
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import android.support.v7.app.AppCompatActivity
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import android.view.MenuItem
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import io.eelo.appinstaller.applicationmanager.ApplicationManager
import io.eelo.appinstaller.applicationmanager.ApplicationManagerServiceConnection
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import io.eelo.appinstaller.applicationmanager.ApplicationManagerServiceConnectionCallback
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import io.eelo.appinstaller.categories.CategoriesFragment
import io.eelo.appinstaller.home.HomeFragment
import io.eelo.appinstaller.search.SearchFragment
import io.eelo.appinstaller.settings.SettingsFragment
import io.eelo.appinstaller.updates.UpdatesFragment
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import io.eelo.appinstaller.utils.Constants
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import io.eelo.appinstaller.utils.Constants.CURRENTLY_SELECTED_FRAGMENT_KEY
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import kotlinx.android.synthetic.main.activity_main.*
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class MainActivity : AppCompatActivity(), BottomNavigationView.OnNavigationItemSelectedListener,
        ApplicationManagerServiceConnectionCallback {
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    private var currentFragmentId = 0
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    private val homeFragment = HomeFragment()
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    private val searchFragment = SearchFragment()
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    private val updatesFragment = UpdatesFragment()
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    private val applicationManagerServiceConnection =
            ApplicationManagerServiceConnection(this)
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    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
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        bottom_navigation_view.setOnNavigationItemSelectedListener(this)
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        disableShiftingOfNabBarItems()
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        // Show the home fragment by default
        currentFragmentId = if (savedInstanceState != null &&
                savedInstanceState.containsKey(CURRENTLY_SELECTED_FRAGMENT_KEY)) {
            savedInstanceState.getInt(CURRENTLY_SELECTED_FRAGMENT_KEY)
        } else {
            R.id.menu_home
        }
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        applicationManagerServiceConnection.bindService(this)
    }
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    override fun onServiceBind(applicationManager: ApplicationManager) {
        initialiseFragments(applicationManager)
        selectFragment(currentFragmentId)
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    }
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    private fun initialiseFragments(applicationManager: ApplicationManager) {
        homeFragment.initialise(applicationManager)
        searchFragment.initialise(applicationManager)
        updatesFragment.initialise(applicationManager)
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    }

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    override fun onNavigationItemSelected(item: MenuItem): Boolean {
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        if (selectFragment(item.itemId)) {
            currentFragmentId = item.itemId
            return true
        }
        return false
    }

    private fun selectFragment(fragmentId: Int): Boolean {
        when (fragmentId) {
            R.id.menu_home -> {
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                showFragment(homeFragment)
                return true
            }
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            R.id.menu_categories -> {
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                showFragment(CategoriesFragment())
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                return true
            }
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            R.id.menu_search -> {
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                showFragment(searchFragment)
                return true
            }
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            R.id.menu_updates -> {
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                showFragment(updatesFragment)
                return true
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            }
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            R.id.menu_settings -> {
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                showFragment(SettingsFragment())
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                return true
            }
        }
        return false
    }

    private fun showFragment(fragment: Fragment) {
        supportFragmentManager
                .beginTransaction()
                .replace(R.id.frame_layout, fragment)
                .commit()
    }

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    @SuppressLint("RestrictedApi")
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    private fun disableShiftingOfNabBarItems() {
        val menuView = bottom_navigation_view.getChildAt(0) as BottomNavigationMenuView
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        try {
            val mShiftingMode = menuView.javaClass.getDeclaredField("mShiftingMode")
            mShiftingMode.isAccessible = true
            mShiftingMode.setBoolean(menuView, false)
            mShiftingMode.isAccessible = false
        } catch (e: NoSuchFieldException) {
            e.printStackTrace()
        } catch (e: IllegalAccessException) {
            e.printStackTrace()
        }

        for (i in 0 until menuView.childCount) {
            val itemView = menuView.getChildAt(i) as BottomNavigationItemView
            itemView.setShiftingMode(false)
            itemView.setChecked(itemView.itemData.isChecked)
        }
    }
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    override fun onRequestPermissionsResult(requestCode: Int, permissions: Array<out String>,
                                            grantResults: IntArray) {
        if (requestCode == Constants.STORAGE_PERMISSION_REQUEST_CODE &&
                grantResults.isNotEmpty() && grantResults[0] == PackageManager.PERMISSION_DENIED) {
            Snackbar.make(container, R.string.error_storage_permission_denied,
                    Snackbar.LENGTH_LONG).show()
        }
    }

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    override fun onSaveInstanceState(outState: Bundle?) {
        super.onSaveInstanceState(outState)
        outState?.putInt(CURRENTLY_SELECTED_FRAGMENT_KEY, currentFragmentId)
    }

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    override fun onDestroy() {
        super.onDestroy()
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        homeFragment.decrementApplicationUses()
        searchFragment.decrementApplicationUses()
        updatesFragment.decrementApplicationUses()
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        applicationManagerServiceConnection.unbindService(this)
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    }
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}