自己定义带三角形箭头的TextView
<?xml version="1.0" encoding="utf-8"?
>
<resources>
<declare-styleable name="ArrowTextView">
<attr name="radius" format="dimension" />
<attr name="arrowWidth" format="dimension" />
<attr name="arrowInHeight" format="dimension" />
<attr name="bg" format="color" />
</declare-styleable>
</resources>
package com.example.sanjjiaoxing;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Path;
import android.graphics.RectF;
import android.util.AttributeSet;
import android.util.TypedValue;
import android.view.View;
import android.widget.LinearLayout;
import android.widget.TextView;
/**
* @author wuxif_000 带三角形箭头的（三角形在一定高度居中，超过该高度无论......），四角带圆角，
*
*/
public class ArrowTextView extends TextView {
public ArrowTextView(Context context, AttributeSet attrs) {
super(context, attrs);
ini(context, attrs);
}
private void ini(Context context, AttributeSet attrs) {
TypedArray typedArray = context.obtainStyledAttributes(attrs, R.styleable.ArrowTextView);
radius=typedArray.getDimension(R.styleable.ArrowTextView_radius, 0);
arrowWidth=typedArray.getDimension(R.styleable.ArrowTextView_arrowWidth, 0);
arrowInHeight=typedArray.getDimension(R.styleable.ArrowTextView_arrowInHeight, 0);
color=typedArray.getColor(R.styleable.ArrowTextView_bg, Color.RED);
}
public ArrowTextView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
ini(context, attrs);
}
public ArrowTextView(Context context) {
super(context);
}
private float radius;
private float arrowWidth;
/**
* 三角形箭头在此高度居中......
*/
private float arrowInHeight;
private int color;
/**
* @param arrowWidth 三角形箭头的宽度.......
*/
public void setArrowWidth(float arrowWidth){
this.arrowWidth=arrowWidth;
invalidate();
}
/**
* @param arrowInHeight 三角形箭头在此高度居中......
*/
public void setArrowInHeight(float arrowInHeight){
this.arrowInHeight=arrowInHeight;
invalidate();
}
/**
* @param radius 矩形四角圆角的半径..........
*/
public void setRadius(float radius){
this.radius=radius;
invalidate();
}
/**
* @param color 箭头矩形的背景色.........
*/
public void setBgColor(int color){
this.color=color;
invalidate();
}
@Override
protected void onDraw(Canvas canvas) {
Paint paint=new Paint();
paint.setColor(color==0?Color.RED:color);
paint.setAntiAlias(true);
if(radius==0){
radius=TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 5, getResources().getDisplayMetrics());
}
if(arrowWidth==0){
arrowWidth=TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 10, getResources().getDisplayMetrics());
}
//带圆角的矩形(左边减去三角形的宽度...........)
int left = (int) (getPaddingLeft()-arrowWidth);
int height=getHeight();
canvas.drawRoundRect(new RectF(left, 0, getWidth(), height), radius, radius, paint);
if(arrowInHeight==0){
arrowInHeight = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 50, getResources().getDisplayMetrics());
}
height = (int) (height>arrowInHeight?
arrowInHeight:height);
//画三角形
Path path=new Path();
path.setFillType(Path.FillType.EVEN_ODD);
float yMiddle = height/2;
float yTop=yMiddle-(arrowWidth/2);
float yBottom=yMiddle+(arrowWidth/2);
path.moveTo(0, yMiddle);
path.lineTo(left, yTop);
path.lineTo(left, yBottom);
path.lineTo(0, yMiddle);
path.close();
canvas.drawPath(path, paint);
// canvas.restore();
// canvas.translate(left, 0);
super.onDraw(canvas);
}
}
//使用方法
<com.example.sanjjiaoxing.ArrowTextView
android:id="@+id/arrowText"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_below="@+id/textView1"
android:layout_marginTop="63dp"
android:paddingBottom="10dp"
android:paddingLeft="15dp"
android:paddingRight="10dp"
android:paddingTop="10dp"
android:text="qqqqqqqqqqqqddddddsdfsfdfdfddddfdsfdfdfdfdfdfdfdfdddddddddddddddddqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqq"
wuxifu:bg="@color/green"
wuxifu:radius="10dp" />
