Question

下面是我在堆栈溢出的一些线程中找到的代码，它减少了字体以适应文本视图中的文本但我想减少以及增加字体以适应文本视图中的文本，这件事没有完成然而，搜索了很多，帮帮我

public class FontFitTextView extends TextView {

    // Attributes
    private Paint mTestPaint;
    private float defaultTextSize;

    public FontFitTextView(Context context) {
        super(context);
        initialize();
    }

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

    private void initialize() {
        mTestPaint = new Paint();
        mTestPaint.set(this.getPaint());
        defaultTextSize = getTextSize();
    }

    /* Re size the font so the specified text fits in the text box
     * assuming the text box is the specified width.
     */
    private void refitText(String text, int textWidth) {

        if (textWidth <= 0 || text.isEmpty())
            return;

        int targetWidth = textWidth - this.getPaddingLeft() - this.getPaddingRight();

        // this is most likely a non-relevant call
        if( targetWidth<=2 )
            return;

        // text already fits with the xml-defined font size?
        mTestPaint.set(this.getPaint());
        mTestPaint.setTextSize(defaultTextSize);
        if(mTestPaint.measureText(text) <= targetWidth) {
            this.setTextSize(TypedValue.COMPLEX_UNIT_PX, defaultTextSize);
            return;
        }

        // adjust text size using binary search for efficiency
        float hi = defaultTextSize;
        float lo = 2;
        final float threshold = 0.5f; // How close we have to be
        while (hi - lo > threshold) {
            float size = (hi + lo) / 2;
            mTestPaint.setTextSize(size);
            if(mTestPaint.measureText(text) >= targetWidth ) 
                hi = size; // too big
            else 
                lo = size; // too small

        }

        // Use lo so that we undershoot rather than overshoot
        this.setTextSize(TypedValue.COMPLEX_UNIT_PX, lo);
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        int parentWidth = MeasureSpec.getSize(widthMeasureSpec);
        int height = getMeasuredHeight();
        refitText(this.getText().toString(), parentWidth);
        this.setMeasuredDimension(parentWidth, height);
    }

    @Override
    protected void onTextChanged(final CharSequence text, final int start,
            final int before, final int after) {
        refitText(text.toString(), this.getWidth());
    }

    @Override
    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
        if (w != oldw || h != oldh) {
            refitText(this.getText().toString(), w);
        }
    }

}

Answer 1

实际上，有一些微不足道的错误。正如您所看到的，在您的代码中有defaultTextSize的检查，因此文本字体不能比它更大，同时在对齐循环中需要更正hi，因为它会阻止搜索大小高于{{ 1}}。

因此，使字体大而无限制的最终代码如下所示：

defaultTextSize

您可以使用以下xml进行测试：

public class FontFitTextView extends TextView {

    // Attributes
    private Paint mTestPaint;
    /** 'Initial' text size */
    private float mDefaultTextSize;

    public FontFitTextView(final Context context) {
        super(context);
        initialize();
    }

    public FontFitTextView(final Context context, final AttributeSet attrs) {
        super(context, attrs);
        initialize();
    }

    private void initialize() {
        mTestPaint = new Paint();
        mTestPaint.set(this.getPaint());
        mDefaultTextSize = getTextSize();
    }

    /*
     * Re size the font so the specified text fits in the text box
     * assuming the text box is the specified width.
     */
    private void refitText(final String text, final int textWidth) {

        if(textWidth <= 0 || text.isEmpty()) {
            return;
        }

        int targetWidth = textWidth - this.getPaddingLeft() - this.getPaddingRight();

        // this is most likely a non-relevant call
        if(targetWidth <= 2) {
            return;
        }

        // text already fits with the xml-defined font size?
        mTestPaint.set(this.getPaint());
        mTestPaint.setTextSize(mDefaultTextSize);

        // adjust text size using binary search for efficiency
        float hi = Math.max(mDefaultTextSize, targetWidth);
        float lo = 2;
        final float threshold = 0.5f; // How close we have to be

        while (hi - lo > threshold) {
            float size = (hi + lo) / 2;
            mTestPaint.setTextSize(size);
            if(mTestPaint.measureText(text) >= targetWidth) {
                hi = size; // too big
            } else {
                lo = size; // too small
            }
        }

        // Use lo so that we undershoot rather than overshoot
        this.setTextSize(TypedValue.COMPLEX_UNIT_PX, lo);
    }

    @Override
    protected void onMeasure(final int widthMeasureSpec, final int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        int parentWidth = MeasureSpec.getSize(widthMeasureSpec);
        int height = getMeasuredHeight();
        refitText(this.getText().toString(), parentWidth);
        this.setMeasuredDimension(parentWidth, height);
    }

    @Override
    protected void onTextChanged(final CharSequence text, final int start,
                                 final int before, final int after) {
        refitText(text.toString(), this.getWidth());
    }

    @Override
    protected void onSizeChanged(final int w, final int h, final int oldw, final int oldh) {
        if (w != oldw || h != oldh) {
            refitText(this.getText().toString(), w);
        }
    }
}

活动：

<RelativeLayout
        xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="match_parent"
        android:layout_height="match_parent">

    <com.example.TestApp.FontFitTextView
        android:layout_width="100dp"
        android:layout_height="100dp"
        android:id="@+id/textView"
        android:layout_centerInParent="true"
        android:text="This text is to be resized." />

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_alignParentLeft="true"
        android:id="@+id/minus_button"
        android:text="-10px"
        android:padding="20dp" />

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_toRightOf="@id/minus_button"
        android:id="@+id/plus_button"
        android:text="+10px"
        android:padding="20dp" />
</RelativeLayout>

增加字体大小以适应TextView Android的高度

1 个答案: