java - 找不到类？

Question

出于某种原因，我无法从我的 Intent 中找到该类，并且出现此错误:

Unable to find explicit activity class {com.example.ruchirb.tutorial/com.example.ruchirb.tutorial.myIntro}; have you declared this activity in your AndroidManifest.xml?

它发生在我尝试开始我的 Activity 时:

 Intent i = new Intent(MainActivity.this, myIntro.class);
                    startActivity(i);

而且我已经在我的 list 中声明了它:

<application
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    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 //RIGHT HERE !!!!!!! SEE ITS DECLARED!!!
            android:name=".myIntro" 
            android:label="@string/app_name"

            />

    </activity>
</application>

我没有类(class)的布局，因为我正在尝试使用这个库制作介绍教程:

https://github.com/PaoloRotolo/AppIntro

这是我的 myIntro.class 的代码:

package com.example.ruchirb.tutorial;


import android.graphics.Color;
import android.os.Bundle;

import com.example.ruchirb.tutorial.R;
import com.github.paolorotolo.appintro.AppIntro;
import com.github.paolorotolo.appintro.AppIntroFragment;

public class myIntro extends AppIntro {

    // Please DO NOT override onCreate. Use init.
    @Override
    public void init(Bundle savedInstanceState) {

        // Add your slide's fragments here.
        // AppIntro will automatically generate the dots indicator and buttons.
        addSlide(AppIntroFragment.newInstance("Hello", "Sup bro", R.mipmap.ic_launcher, Color.RED));
        addSlide(AppIntroFragment.newInstance("NUMBER 2", "Hello again", R.mipmap.ic_launcher, Color.BLUE));




        // OPTIONAL METHODS
        // Override bar/separator color.
        setBarColor(Color.parseColor("#3F51B5"));
        setSeparatorColor(Color.parseColor("#2196F3"));

        // Hide Skip/Done button.
        showSkipButton(false);
        setProgressButtonEnabled(false);

        // Turn vibration on and set intensity.
        // NOTE: you will probably need to ask VIBRATE permisssion in Manifest.
        setVibrate(true);
        setVibrateIntensity(30);
    }

    @Override
    public void onSkipPressed() {
        // Do something when users tap on Skip button.
    }

    @Override
    public void onDonePressed() {
        // Do something when users tap on Done button.
    }

    @Override
    public void onSlideChanged() {
        // Do something when the slide changes.
    }

    @Override
    public void onNextPressed() {
        // Do something when users tap on Next button.
    }

}

可能是什么问题？

谢谢，

鲁契尔

Answer 1

你的语法有误。第二个 Activity 在第一个 Activity 中宣布。所有 Activity 都必须仅在 application 下声明。

<activity android:name=".MainActivity">
    <intent-filter>
        <action android:name="android.intent.action.MAIN" />

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

</activity>
<activity <!-- should be inside application not inside above activity -->
        android:name=".myIntro" 
        android:label="@string/app_name"

 />

应该像上面那样。