最简单的 ToolBar的使用

要使用toolBar，首先我们需要导包：

implementation 'com.android.support:appcompat-v7:26.1.0'

我们看下截图：

我们需要在res/value/style.xml中设置

<style name="AppTheme.Base" parent="Theme.AppCompat.Light.NoActionBar">
    <item name="android:windowNoTitle">true</item>
    <item name="android:windowActionBar">false</item>
    <item name="colorPrimary">@color/colorPrimary</item>
    <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
    <item name="colorAccent">@color/colorAccent</item>
</style>

接着在res/layout/toolbar_title.xml中加入Toolbar控件.

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

    <android.support.design.widget.CoordinatorLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <android.support.design.widget.AppBarLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content">

            <android.support.v7.widget.Toolbar
                android:id="@+id/toolbar_toolbar"
                android:layout_width="match_parent"
                android:layout_height="?attr/actionBarSize"
                android:background="@color/colorPrimaryDark"
                app:layout_scrollFlags="scroll|enterAlways">

                <TextView
                    android:id="@+id/toolbar_name"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="@string/app_name"
                    android:layout_gravity="center_horizontal"
                    android:textColor="#ffffff"
                    android:textSize="20sp" />

                <TextView
                    android:id="@+id/toolbar_add"
                    android:layout_width="wrap_content"
                    android:layout_height="match_parent"
                    android:layout_gravity="center_vertical|right"
                    android:padding="10dp"
                    android:visibility="gone"
                    android:textColor="#ffffff"
                    android:textSize="20sp" />
            </android.support.v7.widget.Toolbar>
        </android.support.design.widget.AppBarLayout>

        <android.support.v4.widget.NestedScrollView
            android:id="@+id/nestedScrollView"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:fillViewport="true"
            app:layout_behavior="@string/appbar_scrolling_view_behavior">

        </android.support.v4.widget.NestedScrollView>
    </android.support.design.widget.CoordinatorLayout>
</LinearLayout>

再来看看ToolbarActivity的代码:

public class ToolbarActivity extends AppCompatActivity {
    protected Context mContext;
    private Toolbar toolbar;
    private NestedScrollView nestedScrollView;
    private TextView toolbar_name;
    public TextView toolbar_add;

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.toolbar_title);
        initToolbarView();
        initToolbarData();

    }

    public void initToolbarView() {
        mContext = this;
        toolbar_name = findViewById(R.id.toolbar_name);
        toolbar = findViewById(R.id.toolbar_toolbar);
        nestedScrollView = findViewById(R.id.nestedScrollView);
        toolbar_add = findViewById(R.id.toolbar_add);
    }

    public void initToolbarData() {
        setSupportActionBar(toolbar);
        setTitle("");

        //显示返回按钮
        getSupportActionBar().setDisplayHomeAsUpEnabled(true);
        //更改返回按钮的图标颜色和样式
        final Drawable upArrow = getResources().getDrawable(R.drawable.abc_ic_ab_back_material);
        upArrow.setColorFilter(getResources().getColor(R.color.ffffff), PorterDuff.Mode.SRC_ATOP);
        getSupportActionBar().setHomeAsUpIndicator(upArrow);
    }
    //设置标题名字
    protected void setToolbarName(String name) {
        toolbar_name.setText(name);
    }

    protected void setAddChildView(int childView) {
        View view = LayoutInflater.from(this).inflate(childView, null);
//        LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT);
//        view.setLayoutParams(layoutParams);
        nestedScrollView.addView(view);
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        if (item.getItemId() == android.R.id.home) {
            finish();
        }
        return super.onOptionsItemSelected(item);
    }

}

接这样了，。一个最简单的toolbar，。