如何使用代码中Animal的myAnimal实例调用类的eat and drink方法？

public class Animal {
    public void eat() {
        System.out.println("Animal Eats");
    }

    public void drink() {
        System.out.println("Animal Drinks");
    }
}

public class Cat extends Animal {
    @Override
    public void eat() {
        System.out.println("Cat Eats");
    }

    @Override
    public void drink() {
        System.out.println("Cat Drinks");
    }

    public static void main(String[] args) {
        Cat myCat = new Cat();
        myCat.eat();
        myCat.drink();

        Animal myAnimal = myCat;        
        myAnimal.eat();
        myAnimal.drink();
    }
}

我得到的输出:

Cat Eats
Cat Drinks
Cat Eats
Cat Drinks

这是我的预期输出:

Cat …

我的问题:

我正在查看TextWatcher的源代码,我没有在这里得到这个概念.扩展到NoCopySpan有什么意义？

TextWatcher.java:

public interface TextWatcher extends NoCopySpan {
     public void beforeTextChanged(CharSequence s, int start, int count, int after);
     public void onTextChanged(CharSequence s, int start, int before, int count);
     public void afterTextChanged(Editable s);
}

NoCopySpan.java:

package android.text;

/**
 * This interface should be added to a span object that should not be copied into a new Spanned when performing a slice or copy operation on the original Spanned it was placed in.
 */
public interface NoCopySpan {
    /**
     * Convenience …

更新:

我尝试了一切.Manifest合并工具有问题吗？

• 工具:更换
• 工具:删除
• 工具:忽略
• 工具:节点

无法解决以下错误:

D:\AndroidStudioProjects\Iknowthis2\app\src\main\AndroidManifest.xml:29:9-36
Error: Attribute application@allowBackup value=(false) from AndroidManifest.xml:29:9-36 is also present at [com.sackcentury:shinebutton:0.1.5] AndroidManifest.xml:12:9-35 value=(true).     
Suggestion: add 'tools:replace="android:allowBackup"'to <application> element at AndroidManifest.xml:27:5-73:19 to override.

D:\AndroidStudioProjects\Iknowthis2\app\src\main\AndroidManifest.xml:34:9-36
Error:  Attribute application@supportsRtl value=(false) from AndroidManifest.xml:34:9-36 is also present at [com.sackcentury:shinebutton:0.1.5] AndroidManifest.xml:14:9-35 value=(true).
Suggestion: add 'tools:replace="android:supportsRtl"' to <application> element at AndroidManifest.xml:27:5-73:19 to override.

应用程序的原始Manifest.xml - 在工具之前:替换

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

    <!-- Include following permission if you load images from Internet -->
    <uses-permission android:name="android.permission.INTERNET" />
    <!-- Include …

我的主要活动代码:

// here you put all your data.
String[] dataArray = { "Amit sharma Kumar", "Hisham Kumar Munner",
        "Vineet John Chaturvedi", "Lucky Kumar Verma" };

ArrayList<String> alAutoCompleteList;
AutoCompleteTextView acTV;
ArrayAdapter<String> adapter1;

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

    // etAuto = (EditText) findViewById(R.id.etAuto);
    acTV = (AutoCompleteTextView) findViewById(R.id.acTV);
    // Arraylist
    alAutoCompleteList = new ArrayList<String>();
    adapter1 = new ArrayAdapter<String>(MainActivity.this,
            android.R.layout.simple_dropdown_item_1line,     alAutoCompleteList);


    acTV.addTextChangedListener(new TextWatcher() {

        @Override
        public void onTextChanged(CharSequence s, int start, int before,
                int count) {
            // TODO Auto-generated method stub …

onMessageReceived()我们的应用程序处于后台/被杀时,是否可以通过Firebase控制台发送数据有效负载？

Edittext有什么特别之处,它可以保留值,但不能保留Textview和其他一些小部件,我们必须为它们使用onSavedInstance()方法.

EditText背后的神奇之处在于它可以保留这些值吗？

如果有人能说出它在内部的运作方式.

<---- ----更新>

它是如何在内部工作的,请指向解释此场景的代码部分.

我想通过API请求检索到目前为止创建的所有主题,类似于firebase控制台显示的列表.见附图.

我想通过获取坐标来设置按钮的动画,然后逐个增加或减少它们,以便按钮可以向左移动然后向右移动.

我需要一个包含textview和edittext的视图.

例:

Yay! you made it to ______ We should hang out! feel ____ to follow me. 

以上"_____"可以是任何长度,它应该感觉到最后一段.上面给出的其余文本不可更改.就像填空.

给定一个图像的URL,我想下载它并将其粘贴到我在android上的画布上.如何将图像检索到我的应用程序？

请帮忙.

谢谢,de costo.