在画布上使用EditText [英] Use EditText on Canvas

问题描述

我正在开发一个应用程序，需要在画布上绘制一个EditText。我能够做到这一点，但是

我只能看到它，而不使用它。这是我初始化EditText的方式

I'm developing an app where I need to draw a EditText on my canvas. I was able to do this, but
I can just see it, not use it. Here is how I've initialized the EditText

et = new EditText(MyActivity.this);
et.setText("edittext");
et.setBackgroundColor(Color.GRAY);
et.requestFocus();
//add it to a LinearLayout
layout.addview(et);

要使EditText实际可用，我缺少什么？

what am I missing to make the EditText actually usable?

推荐答案

您可以使用此代码，在 main 中将此方法添加到获取输入键：

You might use this code, in main add this method to get input keys:

@Override
public boolean dispatchKeyEvent(KeyEvent event) {
    cv = (CustomView) findViewById(R.id.custom_view);
    cv.dispatchKeyEvent(event);
    return super.dispatchKeyEvent(event);
}

在类中扩展了视图类：

@Override
protected void onDraw(Canvas canvas){
    super.onDraw(canvas);

    Paint p = new Paint();
    p.setTextSize(36);

    LinearLayout layout = new LinearLayout(this.getContext());

    EditText textView = new EditText(this.getContext());
    textView.setVisibility(View.VISIBLE);
    textView.setText(key);
    textView.setX(x);//get x from onTouch method
    textView.setY(y); // get y from onTouch method

    layout.addView(textView);

    layout.measure(canvas.getWidth(), canvas.getHeight());
    layout.layout(50,50, canvas.getWidth(), canvas.getHeight());
    layout.draw(canvas);
} 


 @Override
public boolean dispatchKeyEvent(KeyEvent event) {
    int keyaction = event.getAction();

    if(keyaction == event.ACTION_DOWN)
    {
        int keyunicode = event.getUnicodeChar(event.getMetaState() );
        char character = (char) keyunicode;
        key += character;
        System.out.println("DEBUG MESSAGE KEY=" + character);
    }
    // you might add if (delete) 
    // https://stackoverflow.com/questions/7438612/how-to-remove-the-last-character-from-a-string
    // method to delete last character 
    invalidate();
    return super.dispatchKeyEvent(event);
}

您需要将文本存储在一个对象中，该对象包含 x，y，宽度，高度，字符串

You will need to store the text in an object, this object contains x, y, width, height, string

在 onTouch 方法，检查单击是否在同一文本中，然后使 new EditText>> false 并修改旧密钥。

in the onTouch method, check if the click is in the same text, then make new EditText >> false and make the old key to be modified.

这篇关于在画布上使用EditText的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！