Android textview文本在自定义字体的两侧被截断 [英] Android textview text get cut off on the sides with custom font

问题描述

这是在预览版和设备上发生的情况:

This is what happens in the preview and on device:

TextView 没什么特别的，它只是加载自定义字体:

TextView is nothing special, it just loads the custom font:

public class TestTextView extends AppCompatTextView {

    public TestTextView(Context context) {
        super(context);

        init(context);
    }

    public TestTextView(Context context, AttributeSet attrs) {
        super(context, attrs);

        init(context);
    }

    public TestTextView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);

        init(context);
    }

    void init(Context context) {

        Typeface t = Typeface.createFromAsset(context.getAssets(), "fonts/daisy.ttf");

        setTypeface(t);
    }
}

布局也很基础，但以防万一:

Layout is also very basic, but just in case:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/material_red200"
    android:orientation="vertical">    

    <*custompackage* .TestTextView
        android:gravity="left"
        android:padding="0dp"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="just some text for testing"
        android:textColor="@color/material_black"
        android:textSize="100dp" />

</LinearLayout>

如您所见，左侧的部分，如 'j' 和 'f' 被切断了.

As you can see, the left parts, like 'j' and 'f' are cut off.

设置内边距或边距无效.

Setting the padding or margin did not work.

当从其他程序中使用时，此字体适合它的框架.

This font fits into it's frame when using from other programs.

提前致谢.

@play_err_ 提到的不是我的解决方案.

What @play_err_ mentioned is not a solution in my case.

• 我在最终版本中使用了一个自动调整大小的文本视图，因此添加空格会非常困难.
• 我需要解释一下为什么其他程序(例如 Photoshop、After Effects...)可以计算出正确的边界框而 android 不能

• 我也在动态加载不同的字体，我不想创建一个

• I am using in the final version a textview that resizes automatically, so adding spaces would be terribly difficult.
• I need an explanation why other programs (eg photoshop, after effects...) can calculate a proper bounding box and android cannot

• I am also loading different fonts dynamically and I do not want to create an

if(badfont)
     addSpaces()

推荐答案

这个答案让我走上了正确的道路:https://stackoverflow.com/a/28625166/4420543

This answer has led me to the right path: https://stackoverflow.com/a/28625166/4420543

所以，解决方案是创建一个自定义Textview并覆盖onDraw方法:

So, the solution is to create a custom Textview and override the onDraw method:

    @Override
    protected void onDraw(Canvas canvas) {
        final Paint paint = getPaint();
        final int color = paint.getColor();
        // Draw what you have to in transparent
        // This has to be drawn, otherwise getting values from layout throws exceptions
        setTextColor(Color.TRANSPARENT);
        super.onDraw(canvas);
        // setTextColor invalidates the view and causes an endless cycle
        paint.setColor(color);

        System.out.println("Drawing text info:");

        Layout layout = getLayout();
        String text = getText().toString();

        for (int i = 0; i < layout.getLineCount(); i++) {
            final int start = layout.getLineStart(i);
            final int end = layout.getLineEnd(i);

            String line = text.substring(start, end);

            System.out.println("Line:	" + line);

            final float left = layout.getLineLeft(i);
            final int baseLine = layout.getLineBaseline(i);

            canvas.drawText(line,
                    left + getTotalPaddingLeft(),
                    // The text will not be clipped anymore
                    // You can add a padding here too, faster than string string concatenation
                    baseLine + getTotalPaddingTop(),
                    getPaint());
        }
    }

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