1 files changed, 121 insertions, 0 deletions
diff --git a/ui/DarkTheme/Application/src/main/java/com/example/android/darktheme/MainActivity.java b/ui/DarkTheme/Application/src/main/java/com/example/android/darktheme/MainActivity.java
new file mode 100644
index 00000000..64f04f8b
--- /dev/null
+++ b/ui/DarkTheme/Application/src/main/java/com/example/android/darktheme/MainActivity.java
@@ -0,0 +1,121 @@
+/*
+ * Copyright (C) 2019 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.example.android.darktheme;
+
+import android.graphics.drawable.Drawable;
+import android.os.Bundle;
+import android.view.Menu;
+import android.view.MenuItem;
+
+import com.google.android.material.bottomnavigation.BottomNavigationView;
+
+import androidx.annotation.NonNull;
+import androidx.appcompat.app.AppCompatActivity;
+import androidx.appcompat.widget.Toolbar;
+import androidx.core.graphics.drawable.DrawableCompat;
+import androidx.fragment.app.Fragment;
+
+public class MainActivity extends AppCompatActivity {
+
+    private final BottomNavigationView.OnNavigationItemSelectedListener mOnNavigationListener
+            = new BottomNavigationView.OnNavigationItemSelectedListener() {
+
+        @Override
+        public boolean onNavigationItemSelected(@NonNull MenuItem item) {
+            switch (item.getItemId()) {
+                case R.id.navigation_home:
+                    showFragment(WelcomeFragment.TAG);
+                    return true;
+                case R.id.navigation_preferences:
+                    showFragment(PreferencesFragment.TAG);
+                    return true;
+                case R.id.navigation_settings:
+                    showFragment(SettingsFragment.TAG);
+                    return true;
+            }
+            return false;
+        }
+    };
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_main);
+
+        setSupportActionBar((Toolbar) findViewById(R.id.toolbar));
+
+        BottomNavigationView navigation = findViewById(R.id.navigation);
+        navigation.setOnNavigationItemSelectedListener(mOnNavigationListener);
+
+        if (savedInstanceState == null) {
+            showFragment(WelcomeFragment.TAG);
+        }
+    }
+
+    @Override
+    public boolean onCreateOptionsMenu(Menu menu) {
+        getMenuInflater().inflate(R.menu.main_menu, menu);
+
+        // This demonstrates how to programmatically tint a drawable
+        MenuItem item = menu.findItem(R.id.action_more);
+        Drawable drawableWrap = DrawableCompat.wrap(item.getIcon()).mutate();
+        DrawableCompat.setTint(drawableWrap, ColorUtils.getThemeColor(this, R.attr.colorOnPrimary));
+        item.setIcon(drawableWrap);
+
+        return true;
+    }
+
+    @Override
+    public boolean onOptionsItemSelected(MenuItem item) {
+        int id = item.getItemId();
+        if (id == R.id.action_more) {
+            // TODO
+            return true;
+        }
+
+        return super.onOptionsItemSelected(item);
+    }
+
+    private void showFragment(@NonNull String tag) {
+        Fragment fragment = getSupportFragmentManager().findFragmentByTag(tag);
+        if (fragment == null) {
+            switch (tag) {
+                case WelcomeFragment.TAG: {
+                    fragment = new WelcomeFragment();
+                    break;
+                }
+                case PreferencesFragment.TAG: {
+                    fragment = new PreferencesFragment();
+                    break;
+                }
+                case SettingsFragment.TAG: {
+                    fragment = new SettingsFragment();
+                    break;
+                }
+                default: {
+                    fragment = new WelcomeFragment();
+                    break;
+                }
+            }
+        }
+
+        getSupportFragmentManager()
+                .beginTransaction()
+                .replace(R.id.fragment_layout, fragment, tag)
+                .commit();
+    }
+}