Java 构造函数TextView（）未定义

我创建了一个方法来创建具有特定CSS样式的TextView，但是我将代码放在一个类中，它突然停止工作。我第一次使用它是因为它在主类中，但现在它在一个子类中，在那里不起作用，所以我删除了它，现在我得到了一个不同的错误，我不知道如何修复它

public class textviewscreate {

public void textviewToevoegen(RelativeLayout relativeLayout) {
    RelativeLayout.LayoutParams relativeLayoutParams;       
    String[] naam = {"Bouw onderdeel", "Kapconstructie","Kapconstructieve bevesiging","Doorbuiging","Vochtinwerking","Dakconstructie","Constructieve bevesiging","Doorbuiging","Vochtinwerking","Waterkerende lagen","Waterdichtheid (folie)laag","Lekwaterafvoerend vermogen","Detaillering aan dakvoet","Thermischeisolatie","Bevestiging","Aansluitdetails","Isolerend vermogen","Dakpannen en vorsten","Conditie dakpannen en vorsten","Breukschade","Vorstschade","Afschilfering","Aangroei algen en mos"};
    TextView[] textView = new TextView[22];
     //1st TextView
    textView[0] = new TextView();   //This gives an error, first was new TextView(this);

    relativeLayoutParams = new RelativeLayout.LayoutParams(
            RelativeLayout.LayoutParams.WRAP_CONTENT,
            RelativeLayout.LayoutParams.WRAP_CONTENT);

    textView[0].setId(1); // changed id from 0 to 1
    textView[0].setText(naam[0].toUpperCase());
    relativeLayout.addView(textView[0], relativeLayoutParams);
    relativeLayoutParams.setMargins(24, 39, 0, 0);
    // All othet Textviews
    for (int i = 1; i < textView.length; i++) { 
        relativeLayoutParams = new RelativeLayout.LayoutParams(
                RelativeLayout.LayoutParams.WRAP_CONTENT,
                RelativeLayout.LayoutParams.WRAP_CONTENT);      
        relativeLayoutParams.addRule(RelativeLayout.BELOW,
                    textView[i-1].getId());
            relativeLayoutParams.addRule(RelativeLayout.ALIGN_LEFT,
                textView[i-1].getId()); // added top alignment rule

         textView[i] = new TextView(); //Also an error firstly new TextView(this);
            textView[i].setText(naam[i]);
            textView[i].setId(i+1);
            relativeLayout.addView(textView[i], relativeLayoutParams);
    }
}

---

}TextView没有空构造函数。由于您不在activity或fragment的子类中，因此至少应提供上下文作为方法的参数：

public void textviewToevoegen(Context context, RelativeLayout relativeLayout) {
    textView[0] = new TextView(context);

或者在您的情况下，如果RelativeLayout是有效的对象，那么可以使用getContext

public void textviewToevoegen(RelativeLayout relativeLayout) {
    textView[0] = new TextView(relativeLayout.getContext());

---

TextView没有空构造函数。由于您不在activity或fragment的子类中，因此至少应提供上下文作为方法的参数：

public void textviewToevoegen(Context context, RelativeLayout relativeLayout) {
    textView[0] = new TextView(context);

或者在您的情况下，如果RelativeLayout是有效的对象，那么可以使用getContext

public void textviewToevoegen(RelativeLayout relativeLayout) {
    textView[0] = new TextView(relativeLayout.getContext());

---

您需要使用上下文初始化TextView，上下文可以在非活动类的构造函数或方法中传递。比如：

public void textViewToVoegenRelativeLayout变为：

public void textviewToevoegen(RelativeLayout relativeLayout, Context context)  

并将其传递给

textView[i] = new TextView();  

它使用上下文，成为

textView[i] = new TextView(context);  

当您使用TextViewToeGen并从活动中传递relativeLayout时，请传递此活动或该活动的上下文

---

请参阅：

您需要使用上下文初始化TextView，上下文可以在非活动类的构造函数或方法中传递。比如：

public void textViewToVoegenRelativeLayout变为：

public void textviewToevoegen(RelativeLayout relativeLayout, Context context)  

并将其传递给

textView[i] = new TextView();  

它使用上下文，成为

textView[i] = new TextView(context);  

当您使用TextViewToeGen并从活动中传递relativeLayout时，请传递此活动或该活动的上下文

参考：

试试这种方法，希望这能帮助你解决问题

当您提供自定义视图类时，您必须提供一些重载构造函数，这些构造函数将您的自定义视图作为android内置视图，如TextView、Button等

public class textviewscreate {

    private Context context;

    public textviewscreate(Context context, AttributeSet attrs, int defStyle) {
        this.context=context;
    }

    public textviewscreate(Context context, AttributeSet attrs) {
        this.context=context;
    }

    public textviewscreate(Context context) {
        this.context=context;
    }

    public void textviewToevoegen(Context context,RelativeLayout relativeLayout) {
        this.context = context;
        RelativeLayout.LayoutParams relativeLayoutParams;
        String[] naam = {"Bouw onderdeel", "Kapconstructie","Kapconstructieve bevesiging","Doorbuiging","Vochtinwerking","Dakconstructie","Constructieve bevesiging","Doorbuiging","Vochtinwerking","Waterkerende lagen","Waterdichtheid (folie)laag","Lekwaterafvoerend vermogen","Detaillering aan dakvoet","Thermischeisolatie","Bevestiging","Aansluitdetails","Isolerend vermogen","Dakpannen en vorsten","Conditie dakpannen en vorsten","Breukschade","Vorstschade","Afschilfering","Aangroei algen en mos"};
        TextView[] textView = new TextView[22];
        //1st TextView
        textView[0] = new TextView();   //This gives an error, first was new TextView(this);

        relativeLayoutParams = new RelativeLayout.LayoutParams(
                RelativeLayout.LayoutParams.WRAP_CONTENT,
                RelativeLayout.LayoutParams.WRAP_CONTENT);

        textView[0].setId(1); // changed id from 0 to 1
        textView[0].setText(naam[0].toUpperCase());
        relativeLayout.addView(textView[0], relativeLayoutParams);Ij
        relativeLayoutParams.setMargins(24, 39, 0, 0);
        // All othet Textviews
        for (int i = 1; i < textView.length; i++) {
            relativeLayoutParams = new RelativeLayout.LayoutParams(
                    RelativeLayout.LayoutParams.WRAP_CONTENT,
                    RelativeLayout.LayoutParams.WRAP_CONTENT);
            relativeLayoutParams.addRule(RelativeLayout.BELOW,
                    textView[i-1].getId());
            relativeLayoutParams.addRule(RelativeLayout.ALIGN_LEFT,
                    textView[i-1].getId()); // added top alignment rule

            textView[i] = new TextView(); //Also an error firstly new TextView(this);
            textView[i].setText(naam[i]);
            textView[i].setId(i+1);
            relativeLayout.addView(textView[i], relativeLayoutParams);
        }
    }
}

试试这个方法，希望这能帮助你解决你的问题

当您提供自定义视图类时，您必须提供一些重载构造函数，这些构造函数将您的自定义视图作为android内置视图，如TextView、Button等

public class textviewscreate {

    private Context context;

    public textviewscreate(Context context, AttributeSet attrs, int defStyle) {
        this.context=context;
    }

    public textviewscreate(Context context, AttributeSet attrs) {
        this.context=context;
    }

    public textviewscreate(Context context) {
        this.context=context;
    }

    public void textviewToevoegen(Context context,RelativeLayout relativeLayout) {
        this.context = context;
        RelativeLayout.LayoutParams relativeLayoutParams;
        String[] naam = {"Bouw onderdeel", "Kapconstructie","Kapconstructieve bevesiging","Doorbuiging","Vochtinwerking","Dakconstructie","Constructieve bevesiging","Doorbuiging","Vochtinwerking","Waterkerende lagen","Waterdichtheid (folie)laag","Lekwaterafvoerend vermogen","Detaillering aan dakvoet","Thermischeisolatie","Bevestiging","Aansluitdetails","Isolerend vermogen","Dakpannen en vorsten","Conditie dakpannen en vorsten","Breukschade","Vorstschade","Afschilfering","Aangroei algen en mos"};
        TextView[] textView = new TextView[22];
        //1st TextView
        textView[0] = new TextView();   //This gives an error, first was new TextView(this);

        relativeLayoutParams = new RelativeLayout.LayoutParams(
                RelativeLayout.LayoutParams.WRAP_CONTENT,
                RelativeLayout.LayoutParams.WRAP_CONTENT);

        textView[0].setId(1); // changed id from 0 to 1
        textView[0].setText(naam[0].toUpperCase());
        relativeLayout.addView(textView[0], relativeLayoutParams);Ij
        relativeLayoutParams.setMargins(24, 39, 0, 0);
        // All othet Textviews
        for (int i = 1; i < textView.length; i++) {
            relativeLayoutParams = new RelativeLayout.LayoutParams(
                    RelativeLayout.LayoutParams.WRAP_CONTENT,
                    RelativeLayout.LayoutParams.WRAP_CONTENT);
            relativeLayoutParams.addRule(RelativeLayout.BELOW,
                    textView[i-1].getId());
            relativeLayoutParams.addRule(RelativeLayout.ALIGN_LEFT,
                    textView[i-1].getId()); // added top alignment rule

            textView[i] = new TextView(); //Also an error firstly new TextView(this);
            textView[i].setText(naam[i]);
            textView[i].setId(i+1);
            relativeLayout.addView(textView[i], relativeLayoutParams);
        }
    }
}

---

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