java - Unresolved 类 MainActivity

Question

我在使用 Android Studio 时遇到了问题。当我尝试运行任何应用程序时，我收到相同的错误“未找到默认 Activity ”，并且在我的代码行 tools:context=".MainActivity" 中，MainActivity 突出显示为红色并且它说“ Unresolved 类 MainActivity”。即使我创建一个全新的“空 Activity ”，它也会发生。

到目前为止我已经尝试过:

• 正在刷新 IDE 缓存
• 检查 Android list 和 MainActivity 中的包名称
• 选择默认 Activity 应用内配置
• 确保src是源目录

我还注意到，在我的“最高级”应用中，build.gradle 看起来像这样:

Android list :

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.justjava">

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

项目目录+代码:

Activity 主要 xml:

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout 
    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"
    tools:context=".MainActivity">

    <ImageView
        android:id="@+id/coffee_grains"
        android:layout_width="match_parent"
        android:layout_height="300sp"
        android:contentDescription="Coffee Grains"
        android:scaleType="centerCrop"
        android:src="@drawable/coffee_grains"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <ImageView
        android:id="@+id/cup"
        android:layout_width="120sp"
        android:layout_height="170sp"
        android:layout_marginLeft="8dp"
        android:src="@drawable/cup"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintTop_toBottomOf="@id/coffee_grains" />

    <TextView
        android:id="@+id/quantity"
        android:layout_width="100sp"
        android:layout_height="wrap_content"
        android:layout_marginLeft="16sp"
        android:layout_marginTop="16sp"
        android:gravity="center"
        android:text="quantity"
        android:textAllCaps="true"
        android:textSize="16sp"
        app:layout_constraintLeft_toRightOf="@id/cup"
        app:layout_constraintTop_toBottomOf="@id/coffee_grains" />

    <LinearLayout
        android:id="@+id/linearLayout"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        app:layout_constraintLeft_toRightOf="@id/cup"
        app:layout_constraintTop_toBottomOf="@id/quantity">

        <Button
            android:id="@+id/plus"
            android:layout_width="48dp"
            android:layout_height="48dp"
            android:layout_marginLeft="8dp"
            android:onClick="increment"
            android:text="+" />

        <TextView
            android:id="@+id/quantity_text_view"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginLeft="8sp"
            android:layout_marginRight="8sp"
            android:gravity="center"
            android:text="1"
            android:textColor="#000000"
            android:textSize="14sp" />

        <Button
            android:id="@+id/miuns"
            android:layout_width="48dp"
            android:layout_height="48dp"
            android:layout_marginLeft="8dp"
            android:onClick="decrement"
            android:text="-" />
    </LinearLayout>

    <TextView
        android:id="@+id/price"
        android:layout_width="100sp"
        android:layout_height="wrap_content"
        android:layout_marginLeft="16dp"
        android:layout_marginTop="8dp"
        android:gravity="center"
        android:text="order summary"
        android:textAllCaps="true"
        android:textSize="16sp"
        app:layout_constraintLeft_toRightOf="@id/cup"
        app:layout_constraintTop_toBottomOf="@id/linearLayout" />

    <TextView
        android:id="@+id/order_summary_text_view"
        android:layout_width="100dp"
        android:layout_height="wrap_content"
        android:layout_marginLeft="16dp"
        android:layout_marginTop="8dp"
        android:gravity="center"
        android:text="0$"
        android:textSize="16dp"
        app:layout_constraintLeft_toRightOf="@id/cup"
        app:layout_constraintTop_toBottomOf="@id/price" />

    <Button
        android:layout_width="100sp"
        android:layout_height="wrap_content"
        android:layout_marginLeft="16sp"
        android:layout_marginTop="8sp"
        android:gravity="center"
        android:onClick="submitOrder"
        android:text="order"
        android:textSize="16sp"
        app:layout_constraintLeft_toRightOf="@id/cup"
        app:layout_constraintTop_toBottomOf="@id/order_summary_text_view" />
</android.support.constraint.ConstraintLayout>

主要 Activity 文件:

package com.example.justjava;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.TextView;

/**
 * This app displays an order form to order coffee.
 */
public class MainActivity extends AppCompatActivity {

    int quantity = 1;
    double pricePerCup = 2.90;
    String name = "Pawel";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }
    public void increment(View view) {
        quantity = quantity +1;
        displayQuantity(quantity);
    }
    public void decrement(View view) {
        quantity = quantity - 1;
        displayQuantity(quantity);
    }
    private String createOrderSummary(double price){
        String orderSummary = "Name: " + name + "\nQuantity: " + quantity + 
    "\nTotal price: $" + price + "\nThanks!";
        return orderSummary;
    }

    private double calculatePrice(int count, double price){
        return count*price;
    }

    /**
     * This method displays the given text on the screen.
     */
    private void displayMessage(String message) {
        TextView orderSummaryTextView = 
    findViewById(R.id.order_summary_text_view);
        orderSummaryTextView.setText(message);
    }
    /**
     * This method is called when the order button is clicked.
     */
    public void submitOrder(View view) {
        double totalPrice = calculatePrice(quantity, pricePerCup);
        String priceMessage = createOrderSummary(totalPrice);
        displayMessage(priceMessage);
    }

    /**
     * This method displays the given quantity value on the screen.
     */
    private void displayQuantity(int number) {
        TextView quantityTextView = findViewById(R.id.quantity_text_view);
        quantityTextView.setText("" + number);
    }

}

Answer 1

使用这一行 MainActivity XML 文件

tools:context="com.example.justjava.MainActivity"

您不是在 XML 整个 src 目录中引用。

或

只需从 XML 中删除这一行

tools:context=".folderName.MainActivity"