如何在 Android 中使用规则/水平线对齐 EditText 中的文本？

发布于 2024-12-23 03:11:53 字数 586 浏览 3 评论 0原文

基本上我想在Android中做这样的事情：

在此处输入图像描述

我正在尝试在自定义 < 中绘制水平线strong>EditText，然后在这些行上键入内容。

我使用文本大小来表示两条水平线之间的距离。但是，光标的大小和文本的大小不同。因此，我无法继续将文本放置在这些行“上”。

文本库与这些水平线的对齐方式不正确。

以下是用于绘制线条的代码： -

float textSize = getTextSize());
Paint paint = new Paint();
for (int i = 0; i < 50; i++) {
    canvas.drawLine(0, textSize * i, getWidth(), textSize * i, paint);
}

EditText 不提供任何获取光标大小的方法。

请建议是否有任何解决方法，或任何其他更好的方法来做到这一点。

原文

Basically I want to do something like this in Android:

enter image description here

I am trying to draw horizontal lines in a custom EditText, and then typing on these lines.

I am using the text size for the distance between two horizontal lines. However, the size of cursor and that of text is not same. Hence, I am not able to maintain placing text "on" these lines.

The alignment of the text base to these horizontal lines are not coming as proper.

Here is the code used for drawing the lines:-

float textSize = getTextSize());
Paint paint = new Paint();
for (int i = 0; i < 50; i++) {
    canvas.drawLine(0, textSize * i, getWidth(), textSize * i, paint);
}

EditText doesn't privides has any method for getting the cursor size.

Kindly suggest if there is any workaround for this, or any other better way of doing this.

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暗恋未遂 2024-12-30 03:11:53

自定义 EditText，在显示的每行文本之间绘制线条：

public class LinedEditText extends EditText {
    private Rect mRect;
    private Paint mPaint;

    // we need this constructor for LayoutInflater
    public LinedEditText(Context context, AttributeSet attrs) {
        super(context, attrs);

        mRect = new Rect();
        mPaint = new Paint();
        mPaint.setStyle(Paint.Style.STROKE);
        mPaint.setColor(0x800000FF);
    }

    @Override
    protected void onDraw(Canvas canvas) {
        int count = getLineCount();
        Rect r = mRect;
        Paint paint = mPaint;

        for (int i = 0; i < count; i++) {
            int baseline = getLineBounds(i, r);

            canvas.drawLine(r.left, baseline + 1, r.right, baseline + 1, paint);
        }

        super.onDraw(canvas);
    }
}

现在在需要的地方使用 LinedEditText 类的对象。

示例：

public class HorizontalLine extends Activity{
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {   
        super.onCreate(savedInstanceState);
        setTitle("Android: Ruled/horizonal lines in Textview");

        LinearLayout ll = new LinearLayout(this);
        ll.setOrientation(LinearLayout.VERTICAL);
        LayoutParams textViewLayoutParams = new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);

        LinedEditText et = new LinedEditText(this, null);
        et.setText("The name of our country is Bangladesh. I am proud of my country :)");
        et.setLayoutParams(textViewLayoutParams);

        ll.addView(et);
        this.setContentView(ll);

    }

}

输出：

在此处输入图像描述

A custom EditText that draws lines between each line of text that is displayed:

public class LinedEditText extends EditText {
    private Rect mRect;
    private Paint mPaint;

    // we need this constructor for LayoutInflater
    public LinedEditText(Context context, AttributeSet attrs) {
        super(context, attrs);

        mRect = new Rect();
        mPaint = new Paint();
        mPaint.setStyle(Paint.Style.STROKE);
        mPaint.setColor(0x800000FF);
    }

    @Override
    protected void onDraw(Canvas canvas) {
        int count = getLineCount();
        Rect r = mRect;
        Paint paint = mPaint;

        for (int i = 0; i < count; i++) {
            int baseline = getLineBounds(i, r);

            canvas.drawLine(r.left, baseline + 1, r.right, baseline + 1, paint);
        }

        super.onDraw(canvas);
    }
}

Now use object of LinedEditText class where you need.

An Example:

public class HorizontalLine extends Activity{
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {   
        super.onCreate(savedInstanceState);
        setTitle("Android: Ruled/horizonal lines in Textview");

        LinearLayout ll = new LinearLayout(this);
        ll.setOrientation(LinearLayout.VERTICAL);
        LayoutParams textViewLayoutParams = new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);

        LinedEditText et = new LinedEditText(this, null);
        et.setText("The name of our country is Bangladesh. I am proud of my country :)");
        et.setLayoutParams(textViewLayoutParams);

        ll.addView(et);
        this.setContentView(ll);

    }

}