【实训】旋转的文字控件

import android.content.Context;
import android.graphics.Canvas;
import android.util.AttributeSet;
import android.view.Gravity;
import android.widget.TextView;

public class RotateTextView extends TextView {
private static final int DEFAULT_DEGREES = 0;
private int mDegrees;

public RotateTextView(Context context) {
super(context, null);
}

public RotateTextView(Context context, AttributeSet attrs) {
super(context, attrs, android.R.attr.textViewStyle);
this.setGravity(Gravity.CENTER);

mDegrees = DEFAULT_DEGREES;

}

@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
setMeasuredDimension(getMeasuredWidth(), getMeasuredWidth());
}

@Override
protected void onDraw(Canvas canvas) {
canvas.save();
canvas.translate(getCompoundPaddingLeft(), getExtendedPaddingTop());
canvas.rotate(mDegrees, this.getWidth() / 2f, this.getHeight() / 2f);
super.onDraw(canvas);
canvas.restore();
}

public void setDegrees(int degrees) {
mDegrees = degrees;
}
}