View、Text、Button的drawableLeft左侧图片自定义大小

设置工具类

public class ImageTextButton extends android.support.v7.widget.AppCompatTextView {

    private Drawable drawableLeft;
    private int scaleWidth; //dp值
    private int scaleHeight;

    public ImageTextButton(Context context) {
        super(context);
    }

    public ImageTextButton(Context context, AttributeSet attrs) {
        super(context, attrs);
        init(context,attrs);
    }

    public ImageTextButton(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        init(context, attrs);
    }

    public void init(Context context, AttributeSet attrs) {
        TypedArray typedArray = context.obtainStyledAttributes(attrs, R.styleable.ImageTextButton);

        drawableLeft = typedArray.getDrawable(R.styleable.ImageTextButton_leftDrawable);
        scaleWidth = typedArray.getDimensionPixelOffset(R.styleable
                .ImageTextButton_drawableWidth, UIUtils.dp2px(20));
        scaleHeight = typedArray.getDimensionPixelOffset(R.styleable
                .ImageTextButton_drawableHeight, UIUtils.dp2px(20));
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        if (drawableLeft != null) {
            drawableLeft.setBounds(0, 0, UIUtils.dp2px(scaleWidth), UIUtils.dp2px(scaleHeight));
        }
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        this.setCompoundDrawables(drawableLeft, null, null, null);
    }

    /**
     * 设置左侧图片并重绘
     * @param drawableLeft
     */
    public void setDrawableLeft(Drawable drawableLeft) {
        this.drawableLeft = drawableLeft;
        invalidate();
    }

    /**
     * 设置左侧图片并重绘
     * @param drawableLeftRes
     */
    public void setDrawableLeft(int drawableLeftRes) {
        this.drawableLeft = UIUtils.getContext().getResources().getDrawable(drawableLeftRes);
        invalidate();
    }
}

附上attrs：

<!-- ImageTextButton attrs-->
<attr name="leftDrawable" format="reference"/>
<attr name="drawableWidth" format="dimension"/>
<attr name="drawableHeight" format="dimension"/>

<declare-styleable name="ImageTextButton">
    <attr name="leftDrawable"/>
    <attr name="drawableWidth"/>
    <attr name="drawableHeight"/>
</declare-styleable>

最后在xml中调用即可，让我们看一下效果

<com.guorentong.learn.organ.utils.ImageTextButton
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:drawablePadding="5dp"
    android:text="课程时长"
    android:textColor="@color/colorText"
    android:textSize="30px"
    app:drawableHeight="20px"
    app:drawableWidth="6px"
    app:leftDrawable="@drawable/lantiao" />