这篇文章主要为大家展示了“android如何自定义圆角button效果”，内容简而易懂，条理清晰，希望能够帮助大家解决疑惑，下面让小编带领大家一起研究并学习一下“android如何自定义圆角button效果”这篇文章吧。
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主要实现功能：
自定义圆角大小 支持设置leftDrawable，和自定义文字内容（文字和img默认居中） 支持点击效果
源码
RoundRadiusButton.java
/** * author: xujiajia * description: * 1、drawable只有在设置textString的时候才会生效(居中效果两个一起测量) */public class RoundRadiusButton extends View { //data private int width = 0; private int height = 0; private int roundRadius = 16; private int bgColor = Color.LTGRAY; private boolean isTouching = false; //img and text private Drawable leftDrawable = null; private int drawableWidth = 20; private int drawableHeight = 20; private int leftDrawablePaddingRight = 0; private String textString; private int textSize = 30; private int textColor = Color.BLACK; //onDraw Paint paint; Path path; RectF rectF; Rect rect; public RoundRadiusButton(Context context, int width, int height) { super(context); this.width = width; this.height = height; this.setLayoutParams(new ViewGroup.LayoutParams(width, height)); this.setClickable(true); } public RoundRadiusButton(Context context, AttributeSet attrs) { super(context, attrs); getDataFromAttrs(context, attrs); this.setClickable(true); } public RoundRadiusButton(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); getDataFromAttrs(context, attrs); this.setClickable(true); } private void getDataFromAttrs(Context context, AttributeSet attrs) { if (attrs == null) { return; } TypedArray ta = context.obtainStyledAttributes(attrs, R.styleable.RoundRadiusButton); roundRadius = ta.getDimensionPixelOffset(R.styleable.RoundRadiusButton_roundRadius, 16); bgColor = ta.getColor(R.styleable.RoundRadiusButton_bgColor, Color.LTGRAY); leftDrawable = ta.getDrawable(R.styleable.RoundRadiusButton_leftDrawable); drawableWidth = ta.getDimensionPixelOffset(R.styleable.RoundRadiusButton_drawableWidth, 0); drawableHeight = ta.getDimensionPixelOffset(R.styleable.RoundRadiusButton_drawableHeight, 0); leftDrawablePaddingRight = ta.getDimensionPixelOffset(R.styleable.RoundRadiusButton_leftDrawablePaddingRight, 0); textString = ta.getString(R.styleable.RoundRadiusButton_textString); textSize = ta.getDimensionPixelOffset(R.styleable.RoundRadiusButton_textSize, 0); textColor = ta.getColor(R.styleable.RoundRadiusButton_textColor, Color.BLACK); ta.recycle(); } public void setRoundRadius(int roundRadius) { this.roundRadius = roundRadius; invalidate(); } public void setBgColor(int bgColor) { this.bgColor = bgColor; invalidate(); } public void setLeftDrawable(Drawable leftDrawable, int drawableWidth, int drawableHeight, int paddingRight) { this.leftDrawable = leftDrawable; this.drawableWidth = drawableWidth; this.drawableHeight = drawableHeight; this.leftDrawablePaddingRight = paddingRight; invalidate(); } public void setTextString(String textString) { this.textString = textString; invalidate(); } public void setTextColor(int textColor) { this.textColor = textColor; invalidate(); } public void setTextSize(int textSize) { this.textSize = textSize; invalidate(); } @Override public boolean onTouchEvent(MotionEvent event) { if (isClickable()) { switch (event.getAction()) { case MotionEvent.ACTION_DOWN: isTouching = true; invalidate(); break; case MotionEvent.ACTION_UP: isTouching = false; invalidate(); break; } } return super.onTouchEvent(event); } @Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); if (width == 0 || height == 0) { width = getWidth(); height = getHeight(); } if (paint == null) { paint = new Paint(); } if (path == null) { path = new Path(); } if (rectF == null) { rectF = new RectF(); } if (rect == null) { rect = new Rect(); } paint.setColor(bgColor); paint.setAntiAlias(true);//抗锯齿 paint.setStrokeWidth(0);//线的宽度设为0，避免画圆弧的时候部分圆弧与边界相切 paint.setStyle(Paint.Style.FILL_AND_STROKE); path.setFillType(Path.FillType.WINDING); //左上圆角 path.moveTo(0, roundRadius); rectF.set(0, 0, 2 * roundRadius, 2 * roundRadius); path.addArc(rectF, 180, 90); //上边 path.lineTo(width - roundRadius, 0); //右上圆角 rectF.set(width - roundRadius * 2, 0, width, roundRadius * 2); path.addArc(rectF, -90, 90); //右边 path.lineTo(width, height - roundRadius); //右下圆角 rectF.set(width - roundRadius * 2, height - roundRadius * 2, width, height); path.addArc(rectF, 0, 90); //下边 path.lineTo(roundRadius, height); //左下圆角 rectF.set(0, height - roundRadius * 2, 2 * roundRadius, height); path.addArc(rectF, 90, 90); //左边 path.lineTo(0, roundRadius); path.close(); canvas.drawPath(path, paint); if (isTouching) { paint.setColor(getContext().getResources().getColor(R.color.black_tran_30)); canvas.drawPath(path, paint); } //填充背景中间空白的部分 path.moveTo(0, roundRadius); path.lineTo(width - roundRadius, 0); path.lineTo(width, height - roundRadius); path.lineTo(roundRadius, height); path.close(); canvas.drawPath(path, paint); if (isTouching) { paint.setColor(getContext().getResources().getColor(R.color.black_tran_30)); canvas.drawPath(path, paint); } //text, drawable两个一起计算位置 if (!TextUtils.isEmpty(textString)) { paint.setStrokeWidth(1.5f); paint.setColor(textColor); paint.setTextSize(textSize); rect.setEmpty(); paint.getTextBounds(textString, 0, textString.length(), rect); float leftBitmap = 0; float topBitmap = 0; if (leftDrawable != null) { if (leftDrawable != null) { leftBitmap = (1.0f * width - drawableWidth - rect.width() - leftDrawablePaddingRight) / 2; topBitmap = (1.0f * height - drawableHeight) / 2; leftDrawable.setBounds((int) leftBitmap, (int) topBitmap, (int) (leftBitmap + drawableWidth), (int) (topBitmap + drawableHeight)); leftDrawable.draw(canvas); } } float textX = 0; float textY = 1.0f * height / 2 + paint.getTextSize() / 2 - paint.getFontMetrics().descent / 2; if (leftBitmap == 0 && topBitmap == 0) { textX = width / 2 - rect.width() / 2; } else { textX = leftBitmap + drawableWidth + leftDrawablePaddingRight; } canvas.drawText(textString, textX, textY, paint); } }}MainActivity.java
public class MainActivity extends AppCompatActivity { private LinearLayout llContainer; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); initView(); } private void initView() { llContainer = findViewById(R.id.ll_container); RoundRadiusButton roundRadiusButton = new RoundRadiusButton(this, 500, 200); roundRadiusButton.setBgColor(Color.LTGRAY); roundRadiusButton.setRoundRadius(40); //text roundRadiusButton.setTextString("testtesttest"); roundRadiusButton.setTextColor(Color.WHITE); roundRadiusButton.setTextSize(40); //drawable roundRadiusButton.setLeftDrawable(getResources().getDrawable(R.mipmap.ic_launcher), 60, 60, 80); roundRadiusButton.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { Toast.makeText(MainActivity.this, "testest", Toast.LENGTH_LONG).show(); } }); roundRadiusButton.setClickable(false); llContainer.addView(roundRadiusButton); }}activity_main.xml
