Add Drawable Indicator.

app/src/main/java/com/example/zhpan/circleviewpager/view/DrawableIndicator.java

@@ -0,0 +1,112 @@
+package com.example.zhpan.circleviewpager.view;
+
+import android.content.Context;
+import android.graphics.Bitmap;
+import android.graphics.Canvas;
+import android.util.AttributeSet;
+
+import androidx.annotation.Nullable;
+
+import com.zhpan.bannerview.indicator.BaseIndicatorView;
+
+/**
+ * @ author : zhouweibin
+ * @ time: 2019/12/18 17:04.
+ * @ desc: 选中与未选中的图片长宽可能不一样
+ **/
+public class DrawableIndicator extends BaseIndicatorView {
+    // 选中与未选中的图片
+    private Bitmap mCheckedIcon, mNormalIcon;
+    // 图片之间的间距
+    private int mIndicatorPadding;
+    // 选中图片的宽高
+    private int mFocusIconWidth, mFocusIconHeight;
+    //未选中图片的宽高
+    private int mNormalIconWidth, mNormalIconHeight;
+
+    public DrawableIndicator(Context context) {
+        this(context, null);
+    }
+
+    public DrawableIndicator(Context context, @Nullable AttributeSet attrs) {
+        this(context, attrs, 0);
+    }
+
+    public DrawableIndicator(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
+        super(context, attrs, defStyleAttr);
+    }
+
+    @Override
+    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
+        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
+        int maxHeight = Math.max(mFocusIconHeight, mNormalIconHeight);
+        int realWidth = mFocusIconWidth + (mNormalIconWidth + mIndicatorPadding) * (getPageSize() - 1);
+        setMeasuredDimension(realWidth, maxHeight);
+    }
+
+    @Override
+    protected void onDraw(Canvas canvas) {
+        super.onDraw(canvas);
+        if (getPageSize() > 1 || mCheckedIcon == null || mNormalIcon == null) {
+            for (int i = 1; i < getPageSize() + 1; i++) {
+                int left = 0;
+                int top = 0;
+                Bitmap bitmap = mNormalIcon;
+                int index = i - 1;
+                if (index < getCurrentPosition()) {
+                    left = (i - 1) * (mNormalIconWidth + mIndicatorPadding);
+                    top = getMeasuredHeight() / 2 - mNormalIconHeight / 2;
+                } else if (index == getCurrentPosition()) {
+                    left = (i - 1) * (mNormalIconWidth + mIndicatorPadding);
+                    top = getMeasuredHeight() / 2 - mFocusIconHeight / 2;
+                    bitmap = mCheckedIcon;
+                } else {
+                    left = (i - 1) * mIndicatorPadding + (i - 2) * mNormalIconWidth + mFocusIconWidth;
+                    top = getMeasuredHeight() / 2 - mNormalIconHeight / 2;
+                }
+                drawIcon(canvas, left, top, bitmap);
+            }
+        }
+    }
+
+    private void drawIcon(Canvas canvas, int left, int top, Bitmap icon) {
+        if (icon == null) {
+            return;
+        }
+        canvas.drawBitmap(icon, left, top, null);
+    }
+
+    private void initIconSize() {
+        if (mCheckedIcon != null) {
+            mFocusIconWidth = mCheckedIcon.getWidth();
+            mFocusIconHeight = mCheckedIcon.getHeight();
+        }
+
+        if (mNormalIcon != null) {
+            mNormalIconWidth = mNormalIcon.getWidth();
+            mNormalIconHeight = mNormalIcon.getHeight();
+        }
+    }
+
+    public DrawableIndicator setFocusIcon(Bitmap icon) {
+        mCheckedIcon = icon;
+        initIconSize();
+        postInvalidate();
+        return this;
+    }
+
+    public DrawableIndicator setNormalIcon(Bitmap icon) {
+        mNormalIcon = icon;
+        initIconSize();
+        postInvalidate();
+        return this;
+    }
+
+    public DrawableIndicator setIndicatorPadding(int padding) {
+        if (padding >= 0) {
+            mIndicatorPadding = padding;
+            postInvalidate();
+        }
+        return this;
+    }
+}