Android 小技巧之 NavigationView

NavigationView 是一个标准的导航菜单，其菜单内容由菜单资源文件来填充，NavigationView 一般和 DrawerLayout 一起搭配使用构成抽屉菜单，分别由内容页和菜单页组成。

1. 配置 app/build.gradle

dependencies {
    implementation 'com.android.support:design:28.0.0'
    implementation 'com.android.support:recyclerview-v7:28.0.0'
    implementation 'com.android.support:cardview-v7:28.0.0'
    implementation 'com.zhy:base-rvadapter:3.0.3'
}

2. 在 styles.xml 中设置样式

    <style name="AppTheme.AppBarOverlay" parent="ThemeOverlay.AppCompat.Dark.ActionBar">
        <item name="android:actionMenuTextColor">#FFFFFF</item>
    </style>

    <style name="nav_size_theme">
        <item name="android:fontFamily">sans-serif</item>
        <item name="android:textSize">14sp</item>
        <item name="android:textStyle">normal</item>
    </style>

3. 布局文件 & 代码

1)activity_second.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.DrawerLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/drawer_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fitsSystemWindows="true"
    tools:openDrawer="start">

    <include
        layout="@layout/app_bar_main"
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>

    <android.support.design.widget.NavigationView
        android:id="@+id/nav_view"
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:layout_gravity="start"
        android:layout_marginTop="-25dp"
        android:fitsSystemWindows="true"
        android:paddingTop="10dp"
        app:headerLayout="@layout/nav_header_main"
        app:itemBackground="@drawable/nav_item_bg"
        app:itemIconTint="@color/viewDashBoard"
        app:itemTextColor="@color/viewDashBoard"
        app:theme="@style/nav_size_theme"
        app:menu="@menu/activity_main_drawer" />
</android.support.v4.widget.DrawerLayout>

2)nav_header_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="200dp"
    android:background="?attr/colorPrimaryDark"
    android:orientation="vertical"
    android:gravity="center_horizontal"
    android:theme="@style/ThemeOverlay.AppCompat.Dark">
    <com.scarf.xxx.widget.CircleImageView
        android:layout_width="100dp"
        android:layout_height="100dp"
        android:layout_marginTop="50dp"
        android:src="@drawable/ic_item_img"/>
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="8dp"
        android:text="Scarf"
        android:textColor="@color/white"  
        android:textSize="20sp"/>
</LinearLayout>

3)CircleImageView.java

/**
 * Created on 2019/6/5 10:03 AM
 *
 * @author Scarf Gong
 */
@SuppressLint("AppCompatCustomView")
public class CircleImageView extends ImageView {
    private static final ScaleType SCALE_TYPE = ScaleType.CENTER_CROP;
    private static final Bitmap.Config BITMAP_CONFIG = Bitmap.Config.ARGB_8888;
    private static final int COLORDRAWABLE_DIMENSION = 1;
    private static final int DEFAULT_BORDER_WIDTH = 0;
    private static final int DEFAULT_BORDER_COLOR = Color.BLACK;
    private final RectF mDrawableRect = new RectF();
    private final RectF mBorderRect = new RectF();
    private final Matrix mShaderMatrix = new Matrix();
    private final Paint mBitmapPaint = new Paint();
    private final Paint mBorderPaint = new Paint();
    private int mBorderColor = DEFAULT_BORDER_COLOR;
    private int mBorderWidth = DEFAULT_BORDER_WIDTH;
    private Bitmap mBitmap;
    private BitmapShader mBitmapShader;
    private int mBitmapWidth;
    private int mBitmapHeight;
    private float mDrawableRadius;
    private float mBorderRadius;
    private boolean mReady;
    private boolean mSetupPending;

    public CircleImageView(Context context) {
        super(context);
    }

    public CircleImageView(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
    }

    public CircleImageView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        super.setScaleType(SCALE_TYPE);
        TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.CircleImageView, defStyle, 0);
        mBorderWidth = a.getDimensionPixelSize(R.styleable.CircleImageView_border_width, DEFAULT_BORDER_WIDTH);
        mBorderColor = a.getColor(R.styleable.CircleImageView_border_color, DEFAULT_BORDER_COLOR);
        a.recycle();
        mReady = true;
        if (mSetupPending) {
            setup();
            mSetupPending = false;
        }
    }

    @Override
    public ScaleType getScaleType() {
        return SCALE_TYPE;
    }

    @Override
    public void setScaleType(ScaleType scaleType) {
        if (scaleType != SCALE_TYPE) {
            throw new IllegalArgumentException(String.format("ScaleType %s not supported.", scaleType));
        }
    }

    @Override
    protected void onDraw(Canvas canvas) {
        if (getDrawable() == null) {
            return;
        }
        canvas.drawCircle(getWidth() / 2, getHeight() / 2, mDrawableRadius, mBitmapPaint);
        canvas.drawCircle(getWidth() / 2, getHeight() / 2, mBorderRadius, mBorderPaint);
    }

    @Override
    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
        super.onSizeChanged(w, h, oldw, oldh);
        setup();
    }

    public int getBorderColor() {
        return mBorderColor;
    }

    public void setBorderColor(int borderColor) {
        if (borderColor == mBorderColor) {
            return;
        }
        mBorderColor = borderColor;
        mBorderPaint.setColor(mBorderColor);
        invalidate();
    }

    public int getBorderWidth() {
        return mBorderWidth;
    }

    public void setBorderWidth(int borderWidth) {
        if (borderWidth == mBorderWidth) {
            return;
        }
        mBorderWidth = borderWidth;
        setup();
    }

    @Override
    public void setImageBitmap(Bitmap bm) {
        super.setImageBitmap(bm);
        mBitmap = bm;
        setup();
    }

    @Override
    public void setImageDrawable(Drawable drawable) {
        super.setImageDrawable(drawable);
        mBitmap = getBitmapFromDrawable(drawable);
        setup();
    }

    @Override
    public void setImageResource(int resId) {
        super.setImageResource(resId);
        mBitmap = getBitmapFromDrawable(getDrawable());
        setup();
    }

    private Bitmap getBitmapFromDrawable(Drawable drawable) {
        if (drawable == null) {
            return null;
        }
        if (drawable instanceof BitmapDrawable) {
            return ((BitmapDrawable) drawable).getBitmap();
        }
        try {
            Bitmap bitmap;
            if (drawable instanceof ColorDrawable) {
                bitmap = Bitmap.createBitmap(COLORDRAWABLE_DIMENSION, COLORDRAWABLE_DIMENSION, BITMAP_CONFIG);
            } else {
                bitmap = Bitmap.createBitmap(drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight(), BITMAP_CONFIG);
            }
            Canvas canvas = new Canvas(bitmap);
            drawable.setBounds(0, 0, canvas.getWidth(), canvas.getHeight());
            drawable.draw(canvas);
            return bitmap;
        } catch (OutOfMemoryError e) {
            return null;
        }
    }

    private void setup() {
        if (!mReady) {
            mSetupPending = true;
            return;
        }
        if (mBitmap == null) {
            return;
        }
        mBitmapShader = new BitmapShader(mBitmap, Shader.TileMode.CLAMP, Shader.TileMode.CLAMP);
        mBitmapPaint.setAntiAlias(true);
        mBitmapPaint.setShader(mBitmapShader);
        mBorderPaint.setStyle(Paint.Style.STROKE);
        mBorderPaint.setAntiAlias(true);
        mBorderPaint.setColor(mBorderColor);
        mBorderPaint.setStrokeWidth(mBorderWidth);
        mBitmapHeight = mBitmap.getHeight();
        mBitmapWidth = mBitmap.getWidth();
        mBorderRect.set(0, 0, getWidth(), getHeight());
        mBorderRadius = Math.min((mBorderRect.height() - mBorderWidth) / 2, (mBorderRect.width() - mBorderWidth) / 2);
        mDrawableRect.set(mBorderWidth, mBorderWidth, mBorderRect.width() - mBorderWidth, mBorderRect.height() - mBorderWidth);
        mDrawableRadius = Math.min(mDrawableRect.height() / 2, mDrawableRect.width() / 2);
        updateShaderMatrix();
        invalidate();
    }

    private void updateShaderMatrix() {
        float scale;
        float dx = 0;
        float dy = 0;
        mShaderMatrix.set(null);
        if (mBitmapWidth * mDrawableRect.height() > mDrawableRect.width() * mBitmapHeight) {
            scale = mDrawableRect.height() / (float) mBitmapHeight;
            dx = (mDrawableRect.width() - mBitmapWidth * scale) * 0.5f;
        } else {
            scale = mDrawableRect.width() / (float) mBitmapWidth;
            dy = (mDrawableRect.height() - mBitmapHeight * scale) * 0.5f;
        }
        mShaderMatrix.setScale(scale, scale);
        mShaderMatrix.postTranslate((int) (dx + 0.5f) + mBorderWidth, (int) (dy + 0.5f) + mBorderWidth);
        mBitmapShader.setLocalMatrix(mShaderMatrix);
    }

}

4)新建menu文件夹，menu/activity_main_drawer.xml

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto">

    <group android:checkableBehavior="single">
        <item
            android:id="@+id/nav_club"
            android:visible="false" />
        <item
            android:id="@+id/nav_new"
            android:icon="@drawable/ic_new_menu"
            android:title="@string/title_fragment_new" />
        <item
            android:id="@+id/nav_hot"
            android:icon="@drawable/ic_hot_menu"
            android:title="@string/title_fragment_hot" />
        <item
            android:id="@+id/nav_mine"
            android:icon="@drawable/ic_mine_menu"
            android:title="@string/title_fragment_mine"
            app:showAsAction="withText" />

    </group>
</menu>

5)SecondActivity.java

public class SecondActivity extends AppCompatActivity {
    private NavigationView navigationView;
    private DrawerLayout drawer;
    private Toolbar toolbar;
    private ActionBarDrawerToggle mToggle;

    private NewFragment mNewFragment;
    private HotFragment mHotFragment;
    private MineFragment mMineFragment;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_second);

        toolbar = findViewById(R.id.toolbar);
        toolbar.setTitle(R.string.app_name);
        setSupportActionBar(toolbar);
        getSupportActionBar().setLogo(R.drawable.ic_logo);

        drawer = findViewById(R.id.drawer_layout);
        navigationView = findViewById(R.id.nav_view);

        mToggle = setupDrawerToggle();
        drawer.addDrawerListener(mToggle);

        setUpDrawerContent(navigationView);

        mNewFragment = NewFragment.newInstance(1);
        FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
        fragmentTransaction.setCustomAnimations(android.R.anim.fade_in,
                android.R.anim.fade_out);
        fragmentTransaction.replace(R.id.frame, mNewFragment);
        fragmentTransaction.commitAllowingStateLoss();

    }

    private void setUpDrawerContent(NavigationView navigationView) {
        navigationView.setItemIconTintList(null);
        navigationView.setNavigationItemSelectedListener(
                new NavigationView.OnNavigationItemSelectedListener() {
                    @Override
                    public boolean onNavigationItemSelected(MenuItem menuItem) {
                        selectDrawerItem(menuItem);
                        return true;
                    }
                });
    }

    public void selectDrawerItem(MenuItem menuItem) {
        FragmentManager fm = getSupportFragmentManager();
        FragmentTransaction ft = fm.beginTransaction();
        ft.setCustomAnimations(android.R.anim.fade_in, android.R.anim.fade_out);
        switch (menuItem.getItemId()) {
            case R.id.nav_new:
                mNewFragment = NewFragment.newInstance(1);
                ft.replace(R.id.frame,mNewFragment);
                break;

            case R.id.nav_hot:
                mHotFragment = HotFragment.newInstance(2);
                ft.replace(R.id.frame,mHotFragment);
                break;

            case R.id.nav_mine:
                mMineFragment = MineFragment.newInstance(3);
                ft.replace(R.id.frame,mMineFragment);
                break;

                default:
                    break;
        }
        ft.commit();

        if (menuItem.isChecked()) {
            menuItem.setChecked(false);
        } else {
            menuItem.setChecked(true);
        }

        // 改变状态
        menuItem.setChecked(true);
        // 改变标题
        toolbar.setTitle(menuItem.getTitle());
        // 关闭抽屉
        drawer.closeDrawers();
    }

    private ActionBarDrawerToggle setupDrawerToggle() {
        return new ActionBarDrawerToggle(this, drawer, toolbar, R.string.drawer_open, R.string.drawer_close);
    }


    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        if (mToggle.onOptionsItemSelected(item)) {
            return true;
        }
        switch (item.getItemId()) {
            case android.R.id.home:
                drawer.openDrawer(GravityCompat.START);
                return true;

                default:
                    break;
        }
        return super.onOptionsItemSelected(item);
    }

    @Override
    public void onPostCreate(Bundle savedInstanceState) {
        super.onPostCreate(savedInstanceState);
        mToggle.syncState();
    }

    @Override
    public void onConfigurationChanged(Configuration newConfig) {
        super.onConfigurationChanged(newConfig);
        mToggle.onConfigurationChanged(newConfig);
    }
}

6)NewFragment.java (3 个Fragment 类似)

public class NewFragment extends Fragment {
    private String[] nameDatas = new String[]{"智能","红润","日系","自然","艺术黑白","甜美","蜜粉","清新","夏日阳光","唯美","蜜粉",};
    private RecyclerView recyclerView;
    private CommonAdapter<String> adapter;
    public static NewFragment newInstance(int index) {
        NewFragment fragment = new NewFragment();
        Bundle bundle = new Bundle();
        bundle.putInt("index", index);
        fragment.setArguments(bundle);
        return fragment;
    }
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        View view = inflater.inflate(R.layout.fragment_new, container, false);
        initData(view);
        return view;
    }

    private void initData(View view) {
        recyclerView = view.findViewById(R.id.rv);
        recyclerView.setLayoutManager(new GridLayoutManager(getActivity(),3));
        adapter = new CommonAdapter<String>(getActivity(),R.layout.item, Arrays.asList(nameDatas)) {
            @Override
            protected void convert(ViewHolder holder, String s, int position) {
                TextView title = holder.getConvertView().findViewById(R.id.tv_title);
                title.setText(nameDatas[position]);
            }
        };
        recyclerView.setAdapter(adapter);
    }

}

7)fragment_new.xml

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".fragment.HotFragment">

    <android.support.v7.widget.RecyclerView
        android:id="@+id/rv"
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>

</FrameLayout>

8)item.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:gravity="center_horizontal">

    <android.support.v7.widget.CardView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:cardCornerRadius="5dp"
        app:cardElevation="3dp"
        android:layout_margin="8dp"
        xmlns:app="http://schemas.android.com/apk/res-auto"
        xmlns:android="http://schemas.android.com/apk/res/android">

        <ImageView
            android:id="@+id/iv_cover"
            android:layout_width="100dp"
            android:layout_height="100dp"
            android:scaleType="centerCrop"
            android:src="@mipmap/ic_launcher_round"/>
    </android.support.v7.widget.CardView>

    <TextView
        android:id="@+id/tv_title"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="16sp"
        android:text="@string/hello_blank_fragment"
        android:layout_margin="10dp"/>

</LinearLayout>

4. 效果图

nav.jpg