导致类扩展该类型的Java类泛型？

如果你不知道在这些课程中会发生什么，那么请看，我不是100%确定这会起作用，我正在测试这个

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我目前正在创建一个简化的基类，它可以简化class

AttributeSet

中自定义xml属性的使用

基本上，这就是我想要的最终结果…

public class SimpleViewImplementation extends SimpleView<LinearLayout> {

    // List of members here
    private String value;

    public SimpleViewImplementation(Context context) {
        super(context);
    }
    public SimpleViewImplementation(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    @Override
    protected void setFromStyledAttributes(TypedArray attr) {

        // Set conditions for each member here via TypedArray (use setters)
        setValue(attr.getString(R.styleable.SimpleViewImplementation_value));

    }

    @Override
    protected void initView() {

        // Set initial conditions for each member here
        this.value = "this is the default value!";

    }

    // Getters & Setters here for members
    public String getValue() { return this.value; }
    public void setValue(String value) { 

        this.value = value;
        this.updateViewOnSet();
    }

}

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下面是一个如何做到这一点的示例：

编辑：

在这样的设置中会丢失吗

public abstract class SimpleView  {  

private View view;

public SimpleView(Context context, View view) {

    if (view == null || !(view instanceof View)) {
        throw new RuntimeException("SimpleView expects an instance of View");
    }

    this.view = view;

    initView();

}

public SimpleView(Context context, View view, AttributeSet attrs) {

    if (view == null || !(view instanceof View)) {
        throw new RuntimeException("SimpleView expects an instance of View");
    }

    this.view = view;

    initView();

    TypedArray attr = context.getTheme().obtainStyledAttributes(attrs, R.styleable.DrawerSongDetail, 0, 0);

    try {

        this.setFromStyledAttributes(attr);

    } finally { 

        attr.recycle(); 

    }

}

// Sets all members based on AttributeSet parameter
abstract protected void setFromStyledAttributes(TypedArray attr);

// Sets all initial values of members
abstract protected void initView();

protected void updateViewOnSet() {

    view.requestLayout();  
    view.invalidate(); 

}
}

我想你可以用它来：

public class SimpleViewImplementation extends SimpleView {

// List of members here
private String value;

public SimpleViewImplementation(Context context) {
    super(context, new RelativeLayout(context));
    // Define your View here (demonstrated with RelativeLayout)
}

public SimpleViewImplementation(Context context, View view) {
    // Predefined view
    super(context, view);
}

public SimpleViewImplementation(Context context, AttributeSet attrs) {
    super(context, new LinearLayout(context), attrs);
    // Define your View here (demonstrated with LinearLayout)
}

public SimpleViewImplementation(Context context, View view, AttributeSet attrs) {
    super(context, view, attrs);
    // Predefined view
}

@Override
protected void setFromStyledAttributes(TypedArray attr) {

    // Set conditions for each member here via TypedArray (use setters)
    setValue(attr.getString(R.styleable.SimpleViewImplementation_value));

}

@Override
protected void initView() {

    // Set initial conditions for each member here
    this.value = "this is the default value!";

}

// Getters & Setters here for members
public String getValue() { return this.value; }
public void setValue(String value) { 

    this.value = value;
    this.updateViewOnSet();
}

}

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这是一个与我在评论开头分享的链接相当的例子。我知道怎么做。我正在考虑抽象出额外的细节，并试图使类尽可能简单。我确实喜欢这个链接，以显示一个很好的参考，它通常是如何做的。我的问题是专门处理泛型，并将基类扩展到那个泛型，忽略了这个区别，我明天会看一看，如果HMMM没有回答，我将不得不看更多。看起来这可能是我一直在寻找的。昨晚我提出了一个稍微不受欢迎的解决方案，这个解决方案似乎有效，但我不喜欢它的开销。你的这个解决方案可能会解决这个问题。不管怎样，我今天晚些时候会去看看。很公平，我希望它能帮助你朝着正确的方向前进。研究它，我至少学会了克里特泛型：D，尽管这在这个用例中是不可能的。我还不能让你的或我的工作。我将从头开始。类似于您原来的链接，看看我是否可以从那里再次扩展它，您想要

SimpleView

扩展

T

？那不可能，这就是我害怕的。你知道为什么我会喜欢这个的一般概念吗？你看到了我想要的抽象吗

public class SimpleViewImplementation extends SimpleView {

// List of members here
private String value;

public SimpleViewImplementation(Context context) {
    super(context, new RelativeLayout(context));
    // Define your View here (demonstrated with RelativeLayout)
}

public SimpleViewImplementation(Context context, View view) {
    // Predefined view
    super(context, view);
}

public SimpleViewImplementation(Context context, AttributeSet attrs) {
    super(context, new LinearLayout(context), attrs);
    // Define your View here (demonstrated with LinearLayout)
}

public SimpleViewImplementation(Context context, View view, AttributeSet attrs) {
    super(context, view, attrs);
    // Predefined view
}

@Override
protected void setFromStyledAttributes(TypedArray attr) {

    // Set conditions for each member here via TypedArray (use setters)
    setValue(attr.getString(R.styleable.SimpleViewImplementation_value));

}

@Override
protected void initView() {

    // Set initial conditions for each member here
    this.value = "this is the default value!";

}

// Getters & Setters here for members
public String getValue() { return this.value; }
public void setValue(String value) { 

    this.value = value;
    this.updateViewOnSet();
}

}