setSupportActionBar无法应用于android.support.v7.widget.Toolbar [英] setSupportActionBar cannot be applied to android.support.v7.widget.Toolbar

问题描述

在这个新项目上，将工具栏设置为主活动Java文件时，它会在

On this new project, when setting a toolbar into the main activity java file, it gets the error on

"setSupportActionBar(mToolbar)"中说"getSupportActionBar()" AppCompatActivity无法应用于 (android.support.v7.widget.Toolbar)"

"setSupportActionBar(mToolbar)" saying "getSupportActionBar() in AppCompatActivity cannot be applyed to (android.support.v7.widget.Toolbar)"

在类似的问题上，答案只是从已设置的导入android.widget.Toolbar"更改为导入android.support.v7.widget.Toolbar". 主要活动xml是这样的:

On similar questions, the answers was just to change from "import android.widget.Toolbar" to "import android.support.v7.widget.Toolbar" which is already set. The main activity xml is this:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/colorAccent"
    tools:context=".MainActivity">

    <include
        android:id="@+id/main_page_toolbar"
        layout="@layout/app_bar_layout"
        >
    </include>


</RelativeLayout>

我要插入的工具栏是:

<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.Toolbar
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/main_app_bar"
    android:background="@color/colorPrimary"
    android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"
    android:layout_width="match_parent"
    android:layout_height="wrap_content">

</android.support.v7.widget.Toolbar>

以及主要的Java文件:

And the main java file:

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.Toolbar;

public class MainActivity extends AppCompatActivity {

    private Toolbar mToolbar;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mToolbar =  findViewById(R.id.main_page_toolbar);
        getSupportActionBar(mToolbar);
        getSupportActionBar().setTitle("WhatsApp");
    }
}

我错过了什么吗?兼容性集?

Am I missing something? A compatibility set?

推荐答案

看起来像是一个错字，您正在呼叫getSupportActionBar()(带有g)而不是setSupportActionBar().

Looks like it's a typo, and you're calling getSupportActionBar() (with a g) instead of setSupportActionBar().

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