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
时间： 2024-10-31 20:00:06