chore: upgraded gradle

refactor: lint errors

Author: CloudyPadmal

app/src/main/java/io/neurolab/MainActivity.java

@@ -1,6 +1,7 @@
 package io.neurolab;
 
 import android.os.Bundle;
+import android.support.annotation.NonNull;
 import android.support.design.widget.FloatingActionButton;
 import android.support.design.widget.Snackbar;
 import android.view.View;
@@ -20,10 +21,10 @@ public class MainActivity extends AppCompatActivity
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
-        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
+        Toolbar toolbar = findViewById(R.id.toolbar);
         setSupportActionBar(toolbar);
 
-        FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
+        FloatingActionButton fab = findViewById(R.id.fab);
         fab.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View view) {
@@ -32,19 +33,19 @@ public void onClick(View view) {
             }
         });
 
-        DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
+        DrawerLayout drawer = findViewById(R.id.drawer_layout);
         ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
                 this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
         drawer.addDrawerListener(toggle);
         toggle.syncState();
 
-        NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
+        NavigationView navigationView = findViewById(R.id.nav_view);
         navigationView.setNavigationItemSelectedListener(this);
     }
 
     @Override
     public void onBackPressed() {
-        DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
+        DrawerLayout drawer = findViewById(R.id.drawer_layout);
         if (drawer.isDrawerOpen(GravityCompat.START)) {
             drawer.closeDrawer(GravityCompat.START);
         } else {
@@ -76,7 +77,7 @@ public boolean onOptionsItemSelected(MenuItem item) {
 
     @SuppressWarnings("StatementWithEmptyBody")
     @Override
-    public boolean onNavigationItemSelected(MenuItem item) {
+    public boolean onNavigationItemSelected(@NonNull MenuItem item) {
         // Handle navigation view item clicks here.
         int id = item.getItemId();
 
@@ -94,7 +95,7 @@ public boolean onNavigationItemSelected(MenuItem item) {
 
         }
 
-        DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
+        DrawerLayout drawer = findViewById(R.id.drawer_layout);
         drawer.closeDrawer(GravityCompat.START);
         return true;
     }

build.gradle

@@ -7,7 +7,7 @@ buildscript {
         jcenter()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.0.1'
+        classpath 'com.android.tools.build:gradle:3.2.1'
 
 
         // NOTE: Do not place your application dependencies here; they belong

gradle/wrapper/gradle-wrapper.properties

@@ -1,6 +1,6 @@
-#Mon Nov 26 11:47:36 IST 2018
+#Mon Nov 26 11:54:02 IST 2018
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-4.1-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-4.6-all.zip