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牛X素材推荐之TriangleRectangleLabelView

2015-09-24 10:49 本站整理 浏览(236)

转载请注明出处:王亟亟的大牛之路

Git上看到一个比较给力的自定义展示标签的View,分享给大家TriangleRectangleLabelView。然后根据原作者的代码我会对其中运用的一些技术点加以解释,在此在此谢谢原作者的开源精神
先贴一下运行效果:

包结构

整体实现还是很轻量级的,只有一个实现的class和attrs来处理初始化。
TriangleRectangleLabelView(作者已详细标注)
public class TriangleRectangleLabelView extends TextView {
    private static final String TAG = TriangleRectangleLabelView.class.getSimpleName();

    private static final int DEFAULT_BG_COLOR = 0xff41c7cd;
    private static final int DEFAULT_CIRCLE_COLOR = 0xffffffff;
    private static final int DEFAULT_LINE_COLOR = 0xfffb9ece;
    private static final int DEFAULT_HEIGHT = 30;//dp
    private static final int DEFAULT_WIDTH = 70;//dp
    private static final int DEFAULT_ROUND_RECT_RADIUS = 8;//px
    private static final int DEFAULT_ROUND_RECT_WIDTH = 8;//px

    private Paint mBgPaint;
    private Paint mCirclePaint;
    private Paint mLinePaint;

    private int mRoundRectWidth = DEFAULT_ROUND_RECT_WIDTH;//圆角矩形宽度
    private int mRoundRectRadius = DEFAULT_ROUND_RECT_RADIUS;//矩形圆角半径
    private int mCircleRadius = 8;//圆点半径
    private int mCircleSpaceRectangle = 16;//圆点到标签的间隔
    private int mSpaceHeight = 8;//背景上下间隔
    private int mLineWidth = 2;//竖线宽度

    private int mBgColor = DEFAULT_BG_COLOR;//背景颜色
    private int mLineColor = DEFAULT_LINE_COLOR;//竖直线颜色
    private int mCircleColor = DEFAULT_CIRCLE_COLOR;//圆点颜色

    private LINE_MODE mLineMode = LINE_MODE.MIDDLE;//竖线模式

    private boolean isShowLine = false;//是否显示竖线
    private boolean isShowCircle = true;//是否显示圆点
    private boolean isDrawRoundRect = true;//是否显示矩形圆角
    private boolean isLeft = true;//是否箭头朝左显示

    private boolean isFirstPadding = true;

    public static enum LINE_MODE {
        START, MIDDLE, END
    }

    public TriangleRectangleLabelView(Context context) {
        this(context, null);
    }

    public TriangleRectangleLabelView(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
    }

    public TriangleRectangleLabelView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);

        initAttrs(attrs);
        init();
    }

    private void initAttrs(AttributeSet attrs) {
        if (attrs != null) {
            TypedArray a = getContext().obtainStyledAttributes(attrs, R.styleable.TriangleRectangleLabelView);

            mBgColor = a.getColor(R.styleable.TriangleRectangleLabelView_trlvBgColor, mBgColor);
            mLineColor = a.getColor(R.styleable.TriangleRectangleLabelView_trlvLineColor, mLineColor);
            mCircleColor = a.getColor(R.styleable.TriangleRectangleLabelView_trlvCircleColor, mCircleColor);

            isLeft = a.getBoolean(R.styleable.TriangleRectangleLabelView_trlvIsLeft, isLeft);
            isShowLine = a.getBoolean(R.styleable.TriangleRectangleLabelView_trlvIsShowLine, isShowLine);
            isShowCircle = a.getBoolean(R.styleable.TriangleRectangleLabelView_trlvIsShowCircle, isShowCircle);
            isDrawRoundRect = a.getBoolean(R.styleable.TriangleRectangleLabelView_trlvIsDrawRoundRect, isDrawRoundRect);

            mCircleRadius = a.getDimensionPixelSize(R.styleable.TriangleRectangleLabelView_trlvCircleRadius, mCircleRadius);
            mCircleSpaceRectangle = a.getDimensionPixelSize(R.styleable.TriangleRectangleLabelView_trlvCircleSpaceRectangle, mCircleSpaceRectangle);
            mLineWidth = a.getDimensionPixelSize(R.styleable.TriangleRectangleLabelView_trlvLineWidth, mLineWidth);
            mRoundRectWidth = a.getDimensionPixelSize(R.styleable.TriangleRectangleLabelView_trlvRoundRectWidth, mRoundRectWidth);
            mRoundRectRadius = a.getDimensionPixelSize(R.styleable.TriangleRectangleLabelView_trlvRoundRectRadius, mRoundRectRadius);

            DisplayMetrics dm = getResources().getDisplayMetrics();
            int minHeight = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, DEFAULT_HEIGHT, dm);
            int minWidth = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, DEFAULT_WIDTH, dm);
            setMinHeight(minHeight);
            setMinWidth(minWidth);
            a.recycle();
        }
    }

    private void init() {
        mBgPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
        mBgPaint.setStrokeWidth(4);
        mBgPaint.setStyle(Paint.Style.FILL);
        mBgPaint.setColor(mBgColor);
        mBgPaint.setAntiAlias(true);

        mCirclePaint = new Paint(Paint.ANTI_ALIAS_FLAG);
        mCirclePaint.setStrokeWidth(1);
        mCirclePaint.setStyle(Paint.Style.FILL);
        mCirclePaint.setColor(mCircleColor);
        mCirclePaint.setAntiAlias(true);

        mLinePaint = new Paint(Paint.ANTI_ALIAS_FLAG);
        mLinePaint.setStrokeWidth(mLineWidth);
        mLinePaint.setStyle(Paint.Style.FILL);
        mLinePaint.setColor(mLineColor);
        mLinePaint.setAntiAlias(true);
    }

    /**
     * 设置圆角矩形宽度
     *
     * @param roundRectWidth px
     */
    public void setRoundRectWidth(int roundRectWidth) {
        this.mRoundRectWidth = roundRectWidth;
        postInvalidate();
    }

    /**
     * 设置圆角矩形圆角半径
     *
     * @param roundRectRadius px
     */
    public void setRoundRectRadius(int roundRectRadius) {
        this.mRoundRectRadius = roundRectRadius;
        postInvalidate();
    }

    public void setBgColor(int color) {
        mBgColor = color;
        mBgPaint.setColor(mBgColor);
        postInvalidate();
    }

    public void setLineColor(int color) {
        mLineColor = color;
        mLinePaint.setColor(getContext().getResources().getColor(mLineColor));
        postInvalidate();
    }

    /**
     * 设置竖直线模式
     *
     * @param lineMode LINE_MODE: START, MIDDLE, END
     */
    public void setLineMode(LINE_MODE lineMode) {
        this.mLineMode = lineMode;
        postInvalidate();
    }

    /**
     * 是否箭头朝向左
     *
     * @param isLeft true:left false:right
     */
    public void setLeft(boolean isLeft) {
        this.isLeft = isLeft;
        postInvalidate();
    }

    /**
     * 设置 View 上下间距
     *
     * @param spaceHeight px
     */
    public void setSpaceHeight(int spaceHeight) {
        this.mSpaceHeight = spaceHeight;
        isFirstPadding = true;
        postInvalidate();
    }

    /**
     * 设置原点与标签的间隔
     *
     * @param circleSpaceRectangle px
     */
    public void setCircleSpaceRectangle(int circleSpaceRectangle) {
        this.mCircleSpaceRectangle = circleSpaceRectangle;
        isFirstPadding = true;
        postInvalidate();
    }

    /**
     * 设置原点半径
     *
     * @param circleRadius px
     */
    public void setCircleRadius(int circleRadius) {
        this.mCircleRadius = circleRadius;
        isFirstPadding = true;
        postInvalidate();
    }

    /**
     * 设置分割线宽度
     *
     * @param lineWidth px
     */
    public void setLineWidth(int lineWidth) {
        this.mLineWidth = lineWidth;
        mLinePaint.setStrokeWidth(mLineWidth);
        postInvalidate();
    }

    public void setShowLine(boolean isShowLine) {
        this.isShowLine = isShowLine;
        postInvalidate();
    }

    public void setShowCircle(boolean isShowCircle) {
        this.isShowCircle = isShowCircle;
        postInvalidate();
    }

    public void setDrawRoundRect(boolean isDrawRoundRect) {
        this.isDrawRoundRect = isDrawRoundRect;
        postInvalidate();
    }

    @Override
    protected void onDraw(Canvas canvas) {
        drawBackground(canvas);
        super.onDraw(canvas);
    }

    private void drawBackground(Canvas canvas) {
        int height = getHeight();
        int width = getWidth();
        Log.d(TAG, "height = " + height);
        Log.d(TAG, "width = " + width);

        Log.d(TAG, "isFirstPadding = " + isFirstPadding);
        //-------------------Set Text Padding Begin----------------------------//
        if (isFirstPadding) {
            int paddingLeft = mCircleRadius * 2 + mCircleSpaceRectangle + (height - mSpaceHeight) / 2 + 2;
            setPadding(isLeft ? paddingLeft : mRoundRectWidth, mSpaceHeight + 4, isLeft ? mRoundRectWidth + 4 : paddingLeft, mSpaceHeight + 4);
            setGravity(Gravity.CENTER_VERTICAL);
            isFirstPadding = false;
        }
        //-------------------Set Text Padding End----------------------------//

        //-------------------Draw Line Begin----------------------------//
        int startLineX = isShowLine ? (isLeft ? mCircleRadius : width - mCircleRadius) : 0;
        if (isShowLine) {
            if (mLineMode == LINE_MODE.START) {
                canvas.drawLine(startLineX, height / 2, startLineX, height, mLinePaint);
            } else if (mLineMode == LINE_MODE.MIDDLE) {
                canvas.drawLine(startLineX, height, startLineX, 0, mLinePaint);
            } else if (mLineMode == LINE_MODE.END) {
                canvas.drawLine(startLineX, height / 2, startLineX, 0, mLinePaint);
            }
        }
        //-------------------Draw Line End----------------------------//

        //-------------------Draw Circle Begin----------------------------//
        int startCircleX = isShowCircle ? (isLeft ? mCircleRadius : width - mCircleRadius) : 0;
        if (isShowCircle) {
            canvas.drawCircle(startCircleX, height / 2, mCircleRadius, mCirclePaint);
        }
        //-------------------Draw Circle End----------------------------//

        //-------------------Draw RoundRect Begin----------------------------//
        int roundLeft = isDrawRoundRect ? (isLeft ? width - mRoundRectWidth : 0) : 0;
        int roundRight = isDrawRoundRect ? (isLeft ? width : mRoundRectWidth) : 0;

        if (isDrawRoundRect) {
            //draw RoundRect
            RectF rect = new RectF();
            rect.left = roundLeft;
            rect.top = mSpaceHeight;
            rect.right = roundRight;
            rect.bottom = height - mSpaceHeight;
            canvas.drawRoundRect(rect, mRoundRectRadius, mRoundRectRadius, mBgPaint);
        }
        //-------------------Draw RoundRect End----------------------------//

        //-------------------Draw Triangle And Rectangle Begin----------------------------//
        if (isLeft) {
            //draw Triangle And Rectangle
            int startX = mCircleSpaceRectangle + 2 * mCircleRadius;
            Point a = new Point(startX, height / 2);
            Point b = new Point(startX + (height - mSpaceHeight) / 2, height - mSpaceHeight);
            Point c = new Point(width - (isDrawRoundRect ? mRoundRectWidth / 2 : 0), height - mSpaceHeight);
            Point d = new Point(width - (isDrawRoundRect ? mRoundRectWidth / 2 : 0), mSpaceHeight);
            Point e = new Point(startX + (height - mSpaceHeight) / 2, mSpaceHeight);
            Point f = new Point(startX, height / 2);

            Path path = new Path();
            path.moveTo(a.x, a.y);
            path.lineTo(b.x, b.y);
            path.lineTo(c.x, c.y);
            path.lineTo(d.x, d.y);
            path.lineTo(e.x, e.y);
            path.lineTo(f.x, f.y);

            canvas.drawPath(path, mBgPaint);

        } else {
            //draw Triangle And Rectangle
            int startX = width - (mCircleSpaceRectangle + 2 * mCircleRadius);
            Point a = new Point(startX, height / 2);
            Point b = new Point(startX - (height - mSpaceHeight) / 2, height - mSpaceHeight);
            Point c = new Point((isDrawRoundRect ? mRoundRectWidth / 2 : 0), height - mSpaceHeight);
            Point d = new Point((isDrawRoundRect ? mRoundRectWidth / 2 : 0), mSpaceHeight);
            Point e = new Point(startX - (height - mSpaceHeight) / 2, mSpaceHeight);
            Point f = new Point(startX, height / 2);

            Path path = new Path();
            path.moveTo(a.x, a.y);
            path.lineTo(b.x, b.y);
            path.lineTo(c.x, c.y);
            path.lineTo(d.x, d.y);
            path.lineTo(e.x, e.y);
            path.lineTo(f.x, f.y);

            canvas.drawPath(path, mBgPaint);
        }
        //-------------------Draw Triangle And Rectangle End----------------------------//
    }
}

分析:
如果要设置组合标签,就是都连在一起的需要做一下操作
((TriangleRectangleLabelView)findViewById(R.id.trlv1)).setLineMode(TriangleRectangleLabelView.LINE_MODE.START);
        ((TriangleRectangleLabelView)findViewById(R.id.trlv2)).setLineMode(TriangleRectangleLabelView.LINE_MODE.MIDDLE);
        ((TriangleRectangleLabelView)findViewById(R.id.trlv3)).setLineMode(TriangleRectangleLabelView.LINE_MODE.MIDDLE);
        ((TriangleRectangleLabelView)findViewById(R.id.trlv4)).setLineMode(TriangleRectangleLabelView.LINE_MODE.END);

在initAttrs()方法内对标签内容进行了各种初始化,如果你的产品并不需要加以变化,可以写死,那还省蛮多代码的。
这个自定义View牛X的就是在drawBackground()方法中的画布和逻辑计算,写的还是相当缜密的。
重点提拎一下屏幕参数类DisplayMetics
这个类是干嘛的?
提供了一种关于显示的通用信息,如显示大小,分辨率和字体。
这个类怎么初始化?
DisplayMetrics metrics = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics;
而我们的自定义控件使用的是 DisplayMetrics dm = getResources().getDisplayMetrics();
补充下获取的参数是以像素为单位(Pixel) ,“像素”所指的是“绝对像素”而非“相对像素”。
通过 DisplayMetrics的 toString()方法可以获取到 DisplayMetrics的大部分 fields信息,如下是在分辨率为 480x320情况下的一些输出信息:

然后就是一系列的单位了
与分辨率无关的度量单位可以解决这一问题,Android支持下列所有单位:
px(像素):屏幕上的点。
in(英寸):长度单位。
mm(毫米):长度单位。
pt(磅):1/72英寸。
dp(与密度无关的像素):一种基于屏幕密度的抽象单位。在每英寸160点的显示器上,1dp = 1px。
dip:与dp相同,多用于android/ophone示例中。
sp(与刻度无关的像素):与dp类似,但是可以根据用户的字体大小首选项进行缩放。
因为网络问题,也贴下别的 需要的文件,源码就不传了
主布局
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:paddingBottom="@dimen/activity_vertical_margin"
    tools:context=".MainActivity"
    android:orientation="vertical"
    android:gravity="center_horizontal"
    android:background="@drawable/bg">

    <labelviewdemo.wjj.com.labelviewdemo.TriangleRectangleLabelView
        android:id="@+id/trv_name"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textColor="#fff"
        android:singleLine="true"
        android:text="Nice"
        app:trlvIsLeft="false"
        app:trlvCircleRadius="4dp"
        android:textSize="16sp"
        android:layout_marginLeft="48dp"
        android:layout_marginTop="50dp"
        android:layout_alignParentTop="true"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true" />

    <labelviewdemo.wjj.com.labelviewdemo.TriangleRectangleLabelView
        xmlns:app="http://schemas.android.com/apk/res-auto"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textColor="#fff"
        android:singleLine="true"
        android:text="Label 1"
        android:layout_below="@id/trv_name"
        android:textSize="16sp"
        android:layout_toEndOf="@id/trv_name"
        android:layout_toRightOf="@id/trv_name"
        app:trlvIsLeft="true"
        app:trlvCircleRadius="4dp"
        app:trlvBgColor="#ff000000"
        app:trlvCircleColor="#ffffff"
        app:trlvRoundRectRadius="12dp"
        app:trlvRoundRectWidth="10dp" />

    <labelviewdemo.wjj.com.labelviewdemo.TriangleRectangleLabelView
        android:id="@+id/trlv1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textColor="#fff"
        android:singleLine="true"
        android:text="标签1"
        android:textSize="16sp"
        android:layout_centerVertical="true"
        android:layout_toEndOf="@id/trv_name"
        android:layout_toRightOf="@id/trv_name"
        app:trlvIsLeft="true"
        app:trlvCircleRadius="4dp"
        app:trlvBgColor="#72ddbf"
        app:trlvCircleColor="#95e8cd"
        app:trlvIsShowLine="true" />

    <labelviewdemo.wjj.com.labelviewdemo.TriangleRectangleLabelView
        android:id="@+id/trlv2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textColor="#fff"
        android:singleLine="true"
        android:text="标签2"
        android:textSize="16sp"
        android:layout_below="@id/trlv1"
        android:layout_toEndOf="@id/trv_name"
        android:layout_toRightOf="@id/trv_name"
        app:trlvIsLeft="true"
        app:trlvCircleRadius="4dp"
        app:trlvBgColor="#a596d6"
        app:trlvCircleColor="#b6b2db"
        app:trlvIsShowLine="true" />

    <labelviewdemo.wjj.com.labelviewdemo.TriangleRectangleLabelView
        android:id="@+id/trlv3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textColor="#fff"
        android:singleLine="true"
        android:text="标签3"
        android:textSize="16sp"
        android:layout_below="@id/trlv2"
        android:layout_toEndOf="@id/trv_name"
        android:layout_toRightOf="@id/trv_name"
        app:trlvIsLeft="true"
        app:trlvCircleRadius="4dp"
        app:trlvBgColor="#efbe78"
        app:trlvCircleColor="#f1cf9e"
        app:trlvIsShowLine="true" />

    <labelviewdemo.wjj.com.labelviewdemo.TriangleRectangleLabelView
        android:id="@+id/trlv4"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textColor="#fff"
        android:singleLine="true"
        android:text="标签4"
        android:textSize="16sp"
        android:layout_below="@id/trlv3"
        android:layout_toEndOf="@id/trv_name"
        android:layout_toRightOf="@id/trv_name"
        app:trlvIsLeft="true"
        app:trlvCircleRadius="4dp"
        app:trlvBgColor="#f96bbc"
        app:trlvCircleColor="#fc9dcf"
        app:trlvIsShowLine="true" />

</RelativeLayout>

MainActivity
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
((TriangleRectangleLabelView)findViewById(R.id.trlv1)).setLineMode(TriangleRectangleLabelView.LINE_MODE.START); ((TriangleRectangleLabelView)findViewById(R.id.trlv2)).setLineMode(TriangleRectangleLabelView.LINE_MODE.MIDDLE); ((TriangleRectangleLabelView)findViewById(R.id.trlv3)).setLineMode(TriangleRectangleLabelView.LINE_MODE.MIDDLE); ((TriangleRectangleLabelView)findViewById(R.id.trlv4)).setLineMode(TriangleRectangleLabelView.LINE_MODE.END);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}

谢谢大家