效果图

思路

画一条线没什么难度用canvas.drawLine()就可以,主要的是根据效果图有两种笔的效果,一种圆头一种方头,所以我的思路是先用圆头笔画个2px宽的路径,在用方头笔画剩余路径。

Paint

paint.setStyle();
Paint.Style.FILL 填充内部
Paint.Style.FILL_AND_STROKE 填充内部和描边
Paint.Style.STROKE 仅描边


paint.setStrokeCap(); 设置线帽样式
Paint.Cap.BUTT; 无线帽
Paint.Cap.ROUND; 圆形线帽
Paint.Cap.SQUARE; 方形线帽

自定义控件三部曲之绘图篇(七)——Paint之函数大汇总

关键代码

num_a_paint.setStrokeCap(Paint.Cap.ROUND); // 先用圆头笔画
canvas.drawLine(startX, height / 2, startX + 2, height / 2, num_a_paint);
num_a_paint.setStrokeCap(Paint.Cap.BUTT); // 改成方头笔
canvas.drawLine(startX, height / 2, length_a, height / 2, num_a_paint);
num_b_paint.setStrokeCap(Paint.Cap.ROUND);
canvas.drawLine(endX, height / 2, endX - 2, height / 2, num_b_paint);
num_b_paint.setStrokeCap(Paint.Cap.BUTT);
canvas.drawLine(endX, height / 2, length_b - 2, height / 2, num_b_paint);

全部代码

attrs.xml

<declare-styleable name="LineProgressBarView">
    <attr name="bar_width" format="dimension"/>
    <attr name="bar_height" format="dimension"/>
    <attr name="margin" format="integer"/>
    <attr name="num_a" format="float"/>
    <attr name="num_b" format="float"/>
    <attr name="bar_type" format="integer"/>
    <attr name="background_color" format="color"/>
    <attr name="color_a" format="color"/>
    <attr name="color_b" format="color"/>
</declare-styleable>

public class LineProgressBarView extends View {

    private Context context;
    private int background_color,color_a,color_b,margin; // margin 左右边距
    private float bar_height,bar_width;
    private float num_a,num_b;
    private Paint back_paint,num_a_paint,num_b_paint;
    private int width,height;
    private int type;
    // 线的X起始左标
    private float startX;
    private float endX;
    public LineProgressBarView(Context context, @Nullable AttributeSet attrs) {
        super(context, attrs);
        this.context = context;
        getAtt(attrs);
        initPaint();
        setLayerType(View.LAYER_TYPE_SOFTWARE, null); // 硬件加速
    }
    private void getAtt(AttributeSet attrs) {
        TypedArray typedArray = context.obtainStyledAttributes(attrs,R.styleable.LineProgressBarView);
        background_color = typedArray.getColor(R.styleable.LineProgressBarView_background_color,Color.parseColor("#E3E2E2"));
        color_a = typedArray.getColor(R.styleable.LineProgressBarView_color_a,Color.parseColor("#FF6059"));
        color_b = typedArray.getColor(R.styleable.LineProgressBarView_color_b,Color.parseColor("#41CFFF"));
        bar_height = typedArray.getDimension(R.styleable.LineProgressBarView_bar_height,30f);
        bar_width = typedArray.getDimension(R.styleable.LineProgressBarView_bar_width,0);
        margin = typedArray.getInteger(R.styleable.LineProgressBarView_margin,dp2px(30));
        num_a = typedArray.getFloat(R.styleable.LineProgressBarView_num_a,40);
        num_b = typedArray.getFloat(R.styleable.LineProgressBarView_num_b,40);
        type = typedArray.getInteger(R.styleable.LineProgressBarView_bar_type,0);
        typedArray.recycle();
    }
    protected int dp2px(int dpVal) {
        return (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP,dpVal,getResources().getDisplayMetrics());
    }
    protected float dp2px(float dpVal) {
        return (float) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP,dpVal,getResources().getDisplayMetrics());
    }
    private void initPaint() {
        back_paint = getPaint(Paint.Style.FILL,background_color,bar_height);
        back_paint.setStrokeCap(Paint.Cap.ROUND);

        num_a_paint = getPaint(Paint.Style.FILL,color_a,bar_height);
        num_a_paint.setColor(color_a);
        num_b_paint = getPaint(Paint.Style.FILL,color_b,bar_height);
        num_b_paint.setColor(color_b);
    }

    private Paint getPaint(Paint.Style style,int color,float width){
        Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG); //抗锯齿标志
        paint.setStyle(style);
        paint.setColor(color);
        paint.setStrokeWidth(width);
        paint.setAntiAlias(true);
        return paint;
    }
    @Override
    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
        super.onSizeChanged(w, h, oldw, oldh);
        width = w;
        height = h;
        startX = margin;
        endX = width-margin;
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        canvas.drawLine(startX,height/2,endX,height/2,back_paint); // 背景线
        // -><-
        // 从两边往中间画
        float length_a = (endX*num_a/100)+startX-(num_a/100*(startX));
        float length_b = (startX*num_b/100)+endX-(num_b/100*(endX));
        num_a_paint.setStrokeCap(Paint.Cap.ROUND);
        canvas.drawLine(startX, height / 2, startX + 2, height / 2, num_a_paint);
        num_a_paint.setStrokeCap(Paint.Cap.BUTT);
        canvas.drawLine(startX, height / 2, length_a, height / 2, num_a_paint);
        num_b_paint.setStrokeCap(Paint.Cap.ROUND);
        canvas.drawLine(endX, height / 2, endX - 2, height / 2, num_b_paint);
        num_b_paint.setStrokeCap(Paint.Cap.BUTT);
        canvas.drawLine(endX, height / 2, length_b - 2, height / 2, num_b_paint);
    }

    public void setNumAProgress(final int xx) {
        final ValueAnimator anim = ValueAnimator.ofFloat(0,xx);
        anim.setDuration(2000);
        anim.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
            @Override
            public void onAnimationUpdate(ValueAnimator animator) {
                num_a  = (float) animator.getAnimatedValue();
                invalidate();
            }
        });
        anim.start();
    }
    public void setNumBProgress(final int xx) {
        final ValueAnimator anim = ValueAnimator.ofFloat(0,xx);
        anim.setDuration(2000);
        anim.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
            @Override
            public void onAnimationUpdate(ValueAnimator animator) {
                num_b  = (float) animator.getAnimatedValue();
                invalidate();
            }
        });
        anim.start();
    }

}

LineProgressBarView.java


效果图

思路

这个是跟上面图方向不一样的线,然后采用的先画方头的2px宽的,然后用圆头补全。

关键代码

num_a_paint.setStrokeCap(Paint.Cap.BUTT);
canvas.drawLine(centre, height / 2, length_a, height / 2, num_a_paint);
num_a_paint.setStrokeCap(Paint.Cap.ROUND);
canvas.drawLine(length_a+2, height / 2, length_a, height / 2, num_a_paint);
num_b_paint.setStrokeCap(Paint.Cap.BUTT);
canvas.drawLine(centre, height / 2, length_b, height / 2, num_b_paint);
num_b_paint.setStrokeCap(Paint.Cap.ROUND);
canvas.drawLine(length_b, height / 2, length_b+2, height / 2, num_b_paint);

全部代码

跟上面的代码差不多 加了个type值作为判断。

public class LineProgressBarView extends View {

    private Context context;
    private int background_color,color_a,color_b,margin; // margin 左右边距
    private float bar_height,bar_width;
    private float num_a,num_b;
    private Paint back_paint,num_a_paint,num_b_paint;
    private int width,height;
    private int type;
    // 线的X起始左标
    private float startX;
    private float endX;
    public LineProgressBarView(Context context, @Nullable AttributeSet attrs) {
        super(context, attrs);
        this.context = context;
        getAtt(attrs);
        initPaint();
        setLayerType(View.LAYER_TYPE_SOFTWARE, null); // 硬件加速
    }
    private void getAtt(AttributeSet attrs) {
        TypedArray typedArray = context.obtainStyledAttributes(attrs,R.styleable.LineProgressBarView);
        background_color = typedArray.getColor(R.styleable.LineProgressBarView_background_color,Color.parseColor("#E3E2E2"));
        color_a = typedArray.getColor(R.styleable.LineProgressBarView_color_a,Color.parseColor("#FF6059"));
        color_b = typedArray.getColor(R.styleable.LineProgressBarView_color_b,Color.parseColor("#41CFFF"));
        bar_height = typedArray.getDimension(R.styleable.LineProgressBarView_bar_height,30f);
        bar_width = typedArray.getDimension(R.styleable.LineProgressBarView_bar_width,0);
        margin = typedArray.getInteger(R.styleable.LineProgressBarView_margin,dp2px(30));
        num_a = typedArray.getFloat(R.styleable.LineProgressBarView_num_a,40);
        num_b = typedArray.getFloat(R.styleable.LineProgressBarView_num_b,40);
        type = typedArray.getInteger(R.styleable.LineProgressBarView_bar_type,0);
        typedArray.recycle();
    }
    protected int dp2px(int dpVal) {
        return (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP,dpVal,getResources().getDisplayMetrics());
    }
    protected float dp2px(float dpVal) {
        return (float) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP,dpVal,getResources().getDisplayMetrics());
    }
    private void initPaint() {
        back_paint = getPaint(Paint.Style.FILL,background_color,bar_height);
        back_paint.setStrokeCap(Paint.Cap.ROUND);

        num_a_paint = getPaint(Paint.Style.FILL,color_a,bar_height);
        num_a_paint.setColor(color_a);
        num_b_paint = getPaint(Paint.Style.FILL,color_b,bar_height);
        num_b_paint.setColor(color_b);
    }

    private Paint getPaint(Paint.Style style,int color,float width){
        Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG); //抗锯齿标志
        paint.setStyle(style);
        paint.setColor(color);
        paint.setStrokeWidth(width);
        paint.setAntiAlias(true);
        return paint;
    }
    @Override
    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
        super.onSizeChanged(w, h, oldw, oldh);
        width = w;
        height = h;
        startX = margin;
        endX = width-margin;
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        canvas.drawLine(startX,height/2,endX,height/2,back_paint); // 背景线
        if (type==0) {

            // -><-
            // 从两边往中间画
            float length_a = (endX*num_a/100)+startX-(num_a/100*(startX));
            float length_b = (startX*num_b/100)+endX-(num_b/100*(endX));
            num_a_paint.setStrokeCap(Paint.Cap.ROUND);
            canvas.drawLine(startX, height / 2, startX + 2, height / 2, num_a_paint);
            num_a_paint.setStrokeCap(Paint.Cap.BUTT);
            canvas.drawLine(startX, height / 2, length_a, height / 2, num_a_paint);
            num_b_paint.setStrokeCap(Paint.Cap.ROUND);
            canvas.drawLine(endX, height / 2, endX - 2, height / 2, num_b_paint);
            num_b_paint.setStrokeCap(Paint.Cap.BUTT);
            canvas.drawLine(endX, height / 2, length_b - 2, height / 2, num_b_paint);
        } else if (type == 1){
            //<-|->
            // 从中间往两边画
            float centre=(endX-startX)/2+margin;
            float length_a = (startX*num_b/100)+centre-(num_b/100*(centre));
            float length_b = (endX*num_a/100)+centre-(num_a/100*(centre));
            num_a_paint.setStrokeCap(Paint.Cap.BUTT);
            canvas.drawLine(centre, height / 2, length_a, height / 2, num_a_paint);
            num_a_paint.setStrokeCap(Paint.Cap.ROUND);
            canvas.drawLine(length_a+2, height / 2, length_a, height / 2, num_a_paint);
            num_b_paint.setStrokeCap(Paint.Cap.BUTT);
            canvas.drawLine(centre, height / 2, length_b, height / 2, num_b_paint);
            num_b_paint.setStrokeCap(Paint.Cap.ROUND);
            canvas.drawLine(length_b, height / 2, length_b+2, height / 2, num_b_paint);
        }

    }

    public void setNumAProgress(final int xx) {
        final ValueAnimator anim = ValueAnimator.ofFloat(0,xx);
        anim.setDuration(2000);
        anim.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
            @Override
            public void onAnimationUpdate(ValueAnimator animator) {
                num_a  = (float) animator.getAnimatedValue();
                invalidate();
            }
        });
        anim.start();
    }
    public void setNumBProgress(final int xx) {
        final ValueAnimator anim = ValueAnimator.ofFloat(0,xx);
        anim.setDuration(2000);
        anim.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
            @Override
            public void onAnimationUpdate(ValueAnimator animator) {
                num_b  = (float) animator.getAnimatedValue();
                invalidate();
            }
        });
        anim.start();
    }

    public void setType(int type) {
        this.type = type;
        invalidate();
    }
}

RingProgressBarView.java


调用

activity_line_progress_bar.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              android:orientation="vertical"
                                             xmlns:app="http://schemas.android.com/apk/res-auto"
                                             android:layout_width="match_parent"
                                             android:layout_height="match_parent">

    <Button android:id="@+id/switch_type_btn" android:layout_width="wrap_content" android:layout_height="wrap_content"
    android:text="切换type"/>
    <com.demo.android_view.mview.LineProgressBarView
            android:id="@+id/lll"
            android:layout_width="match_parent"
            app:bar_type="0"
            android:layout_height="wrap_content"/>
</LinearLayout>

LineProgressBarActivity.java

public class LineProgressBarActivity extends AppCompatActivity {

    private LineProgressBarView lll;
    private Button switch_type_btn;
    private int type = 0;

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_line_progress_bar);
        switch_type_btn = findViewById(R.id.switch_type_btn);
        lll = findViewById(R.id.lll);
        lll.setNumAProgress(40);
        lll.setNumBProgress(40);

        switch_type_btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                lll.setType(type==0?1:0);
                if (type==0) type = 1; else type = 0;
            }
        });
    }
}

源代码

源代码

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