我一直在改进speedplane提供的优秀解决方案,并创造了这个。它管理高度,包括设置边距以使文本垂直居中。
它使用相同的函数来获取宽度,因为它似乎效果最好,但使用不同的函数来获取高度,因为高度没有任何提供。有一些需要进行更正,但我已经找到了一种方法来实现,同时看起来也很美观。
import android.content.Context;
import android.graphics.Paint;
import android.graphics.Rect;
import android.util.AttributeSet;
import android.util.TypedValue;
import android.widget.TextView;
public class FontFitTextView extends TextView {
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());
}
private void refitText(String text, int textWidth,int textHeight)
{
if (textWidth <= 0)
return;
int targetWidth = textWidth - this.getPaddingLeft() - this.getPaddingRight();
int targetHeight = textHeight - this.getPaddingTop() - this.getPaddingBottom();
float hi = Math.min(targetHeight,100);
float lo = 2;
final float threshold = 0.5f;
Rect bounds = new Rect();
mTestPaint.set(this.getPaint());
while((hi - lo) > threshold) {
float size = (hi+lo)/2;
mTestPaint.setTextSize(size);
mTestPaint.getTextBounds(text, 0, text.length(), bounds);
if((mTestPaint.measureText(text)) >= targetWidth || (1+(2*(size+(float)bounds.top)-bounds.bottom)) >=targetHeight)
hi = size;
else
lo = size;
}
this.setTextSize(TypedValue.COMPLEX_UNIT_PX,(float) lo);
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec)
{
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
int parentWidth = MeasureSpec.getSize(widthMeasureSpec);
int parentHeight = MeasureSpec.getSize(heightMeasureSpec);
int height = getMeasuredHeight();
refitText(this.getText().toString(), parentWidth,height);
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(),this.getHeight());
}
@Override
protected void onSizeChanged (int w, int h, int oldw, int oldh) {
if (w != oldw) {
refitText(this.getText().toString(), w,h);
}
}
private Paint mTestPaint;
}