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Androids使用TextvView實現鏤空字體效果？針對這個問題，這篇文章詳細介紹了相對應的分析和解答，希望可以幫助更多想解決這個問題的小伙伴找到更簡單易行的方法。
自定義TextView
public class HollowTextView extends AppCompatTextView {
private Paint mTextPaint, mBackgroundPaint;
private Bitmap mBackgroundBitmap,mTextBitmap;
private Canvas mBackgroundCanvas,mTextCanvas;
private RectF mBackgroundRect;
private int mBackgroundColor;
private float mCornerRadius;
public HollowTextView(Context context) {
this(context,null);
}
public HollowTextView(Context context, AttributeSet attrs) {
super(context, attrs);
initAttrs(attrs,0);
initPaint();
}
public HollowTextView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
initAttrs(attrs,defStyleAttr);
initPaint();
}
private void initAttrs(AttributeSet attrs,int defStyleAttr){
if(attrs == null){
return;
}
TypedArray typedArray = getContext().obtainStyledAttributes(attrs, R.styleable.HollowTextView, defStyleAttr, 0);
mBackgroundColor = typedArray.getColor(R.styleable.HollowTextView_hollowTextView_background_color, Color.TRANSPARENT);
mCornerRadius = typedArray.getDimension(R.styleable.HollowTextView_hollowTextView_corner_radius,0);
typedArray.recycle();
}
/***
* 初始化畫筆屬性
*/
private void initPaint() {
//畫文字的paint
mTextPaint = new Paint();
//這是鏤空的關鍵
mTextPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_OUT));
mTextPaint.setAntiAlias(true);
mBackgroundPaint = new Paint();
mBackgroundPaint.setColor(mBackgroundColor);
mBackgroundPaint.setAntiAlias(true);
}
@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
super.onSizeChanged(w, h, oldw, oldh);
mBackgroundBitmap = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_4444);
mBackgroundCanvas = new Canvas(mBackgroundBitmap);
mTextBitmap = Bitmap.createBitmap(w,h,Bitmap.Config.ARGB_4444);
mTextCanvas = new Canvas(mTextBitmap);
mBackgroundRect = new RectF(0,0,getWidth(),getHeight());
}
@Override
protected void onDraw(Canvas canvas) {
//這里給super傳入的是mTextCanvas，把一些基本屬性都支持進去
super.onDraw(mTextCanvas);
drawBackground(mBackgroundCanvas);
int sc;
if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP ){
sc = canvas.saveLayer(0,0,getMeasuredWidth(),getMeasuredHeight(),null);
}else {
sc = canvas.saveLayer(0,0,getMeasuredWidth(),getMeasuredHeight(),null,Canvas.ALL_SAVE_FLAG);
}
canvas.drawBitmap(mBackgroundBitmap,0,0,null);
canvas.drawBitmap(mTextBitmap, 0, 0, mTextPaint);
canvas.restoreToCount(sc);
}
private void drawBackground(Canvas canvas){
if(mCornerRadius > 0){
canvas.drawRoundRect(mBackgroundRect,mCornerRadius,mCornerRadius, mBackgroundPaint);
}else {
canvas.drawColor(mBackgroundColor);
}
}attr.xml文件
<declare-styleable name="HollowTextView">
<attr name="hollowTextView_background_color" format="color|reference"/>
<attr name="hollowTextView_corner_radius" format="dimension|reference"/>
</declare-styleable>xml中使用
<com.cn.util.HollowTextView
android:id="@+id/hollowtext"
android:layout_width="60dp"
android:layout_height="50dp"
android:gravity="center"
android:text="99+"
android:textSize="30sp"
android:textStyle="bold"
app:hollowTextView_background_color="@color/white"
app:hollowTextView_corner_radius="5dp"
android:layout_centerInParent="true"/>關于Androids使用TextvView實現鏤空字體效果問題的解答就分享到這里了，希望以上內容可以對大家有一定的幫助，如果你還有很多疑惑沒有解開，可以關注億速云行業資訊頻道了解更多相關知識。
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