七、ToolBar（导航栏）

常用属性

android:layout_width="match_parent"

android:layout_height="?attr/actionBarSize"

android:background="#ffff00"

app:navigationlcon="@drawable/ic_baseline_arrow_back_24" //一般的导航返回键位

app:title="主标题"

app:titleTextColor="#ff0000"

app:titleMarginStart="90dp"

app:subtitle="子标题"

app:subtitleTextColor="#0OrffF"

app:logo="@mipmap/ic_launcher"

ui源码示例

<?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="match_parent"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:orientation="vertical">
 
    <!--在xml中进行赋值-->
    <androidx.appcompat.widget.Toolbar
        android:background="@color/purple_200"
        android:id="@+id/tb"
        app:title="测试标题"
        app:titleTextColor="@color/white"
        app:titleMarginStart="90dp"
        app:navigationIcon="@drawable/ic_baseline_arrow_back_24"
        app:subtitle="子标题"
        app:subtitleTextColor="#ff00ff00"
        app:logo="@mipmap/ic_launcher"
        android:layout_width="match_parent"
        android:layout_height="?attr/actionBarSize" />
 
    <!--在main程序中进行赋值-->
    <androidx.appcompat.widget.Toolbar
        android:layout_marginTop="10dp"
        android:id="@+id/toolBarSet"
        android:background="@color/purple_200"
        android:layout_width="match_parent"
        android:layout_height="?attr/actionBarSize"/>
 
    <!--将标题放置屏幕中间-->
    <androidx.appcompat.widget.Toolbar
        android:layout_marginTop="10dp"
        android:background="@color/purple_200"
        app:navigationIcon="@drawable/ic_baseline_arrow_back_24"
        android:layout_width="match_parent"
        android:layout_height="?attr/actionBarSize">
        <TextView
            android:text="标题"
            android:textSize="28sp"
            android:textColor="@color/white"
            android:layout_gravity="center"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"/>
    </androidx.appcompat.widget.Toolbar>
 
</LinearLayout>

　　效果图

点击后退箭头，后台代码示例

package com.example.mytoolbar;
 
import androidx.appcompat.app.AppCompatActivity;
import androidx.appcompat.widget.Toolbar;
 
import android.os.Bundle;
import android.util.Log;
import android.view.View;
 
public class MainActivity extends AppCompatActivity {
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
 
        Toolbar view = findViewById(R.id.tb);
        view.setNavigationOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Log.e("toolBar1", "监听信息跳转,ToolBar1被点击 ");
            }
        });
 
 
        //在代码中设置ToolBar的属性信息
        Toolbar view2 = findViewById(R.id.toolBarSet);
        view2.setNavigationIcon(R.drawable.ic_baseline_arrow_back_24);
        view2.setTitle("测试标题2");
        view2.setNavigationOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Log.e("toolBar2", "监听信息跳转，toolBar2被点击");
            }
        });
    }
}