使用这个实用程序类:
com.cutompackage;
import android.content.Context;
import android.graphics.Paint;
import android.util.AttributeSet;
import android.util.TypedValue;
import android.widget.TextView;
/**
* Utillity class which is changing font size of text view in app in order to fit to given dimensions
* @author Darko
*
*/
public class FontFitTextView extends TextView {
public FontFitTextView(Context context) {
super(context);
initialise();
}
public FontFitTextView(Context context, AttributeSet attrs) {
super(context, attrs);
initialise();
}
private void initialise() {
mTestPaint = new Paint();
mTestPaint.set(this.getPaint());
// max size defaults to the initially specified text size unless it is
// too small
}
/*
* 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)
return;
int targetWidth = textWidth - this.getPaddingLeft()
- this.getPaddingRight();
float hi = 100;
float lo = 2;
final float threshold = 0.5f; // How close we have to be
mTestPaint.set(this.getPaint());
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
if (this.getTextSize() > lo) {
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) {
refitText(this.getText().toString(), w);
}
}
// Attributes
private Paint mTestPaint;
}
然后只需在 xml 中设置,如:
<com.cutompackage.FontFitTextView
android:id="@+id/headerText"
android:layout_width="0dip"
android:layout_height="match_parent"
android:layout_gravity="center"
android:textAppearance="?android:attr/textAppearanceLarge"
android:textColor="@color/text_color"
android:textSize="22sp" />
编辑:它会自动更改字体大小以适应给定的尺寸(高度和宽度),TextView
现在您只需要正确设置尺寸即可。
希望能帮助到你