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条纹进度条

相关代码请参阅: https://github.com/RustFisher/aboutView/blob/master/app/src/main/java/com/rust/aboutview/activity/RoundCornerActivity.java

素材图 素材样例

如果用shape或者.9图片不太好处理这个条纹。转变思路,放置2张图片。一张作为背景(底,bottom),一张作为进度条图片(cover)。 进度改变时,改变上面图片的宽度。

这就要求上面的图片是圆角的。自定义ImageView,调用canvas.clipPath来切割画布。

public class RoundCornerImageView extends android.support.v7.widget.AppCompatImageView {
    private float mRadius = 18;
    private Path mClipPath = new Path();
    private RectF mRect = new RectF();

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

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

    public RoundCornerImageView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
    }

    public void setRadiusDp(float dp) {
        mRadius = dp2px(dp, getResources());
        postInvalidate();
    }

    public void setRadiusPx(int px) {
        mRadius = px;
        postInvalidate();
    }

    @Override
    protected void onDraw(Canvas canvas) {
        mRect.set(0, 0, this.getWidth(), this.getHeight());
        mClipPath.reset(); // remember to reset path
        mClipPath.addRoundRect(mRect, mRadius, mRadius, Path.Direction.CW);
        canvas.clipPath(mClipPath);
        super.onDraw(canvas);
    }

    private float dp2px(float value, Resources resources) {
        return TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, value, resources.getDisplayMetrics());
    }
}

每次绘制都切割一次圆角。记得调用Path.reset()方法。

回到我们要的进度条。布局文件中放置好层叠的图片。

    <RelativeLayout
        android:id="@+id/progress_layout"
        android:layout_width="190dp"
        android:layout_height="10dp"
        android:layout_centerInParent="true">

        <ImageView
            android:id="@+id/p_bot_iv"
            android:layout_width="190dp"
            android:layout_height="10dp"
            android:src="@drawable/shape_round_corner_bottom" />

        <com.rustfisher.view.RoundCornerImageView
            android:id="@+id/p_cover_iv"
            android:layout_width="100dp"
            android:layout_height="10dp"
            android:scaleType="centerCrop"
            android:src="@drawable/pic_cover_blue_white" />

    </RelativeLayout>

需要在代码中动态地改变cover的宽度;dialog中提供如下方法改变LayoutParams

    public void updatePercent(int percent) {
        mPercent = percent;
        mPercentTv.setText(String.format(Locale.CHINA, "%2d%%", mPercent));
        float percentFloat = mPercent / 100.0f;
        final int ivWidth = mBotIv.getWidth();
        RelativeLayout.LayoutParams lp = (RelativeLayout.LayoutParams) mProgressIv.getLayoutParams();
        int marginEnd = (int) ((1 - percentFloat) * ivWidth);
        lp.width = ivWidth - marginEnd;
        mProgressIv.setLayoutParams(lp);
        mProgressIv.postInvalidate();
    }

显示出dialog并传入进度,就可以看到效果了。