效果图

public class SawtoothBlackView extends View {

//自定义画笔的属性

private Paint paint;

//获取屏幕的系数

private DisplayMetrics dm;

//不规则块的高

private int big_heigth;

//总的宽度

private int big_width;

//小角的高度

private int triangle_height;

//小角的高度

private int triangle_width;

//是否是向上画的

private boolean state=true;

public boolean getState() {

return state;

}

public void setState(boolean state) {

this.state = state;

}

public void setPaint(Paint paint) {

this.paint = paint;

}

public void setDm(DisplayMetrics dm) {

this.dm = dm;

}

public void setBig_heigth(int big_heigth) {

this.big_heigth = big_heigth;

}

public void setBig_width(int big_width) {

this.big_width = big_width;

}

public SawtoothBlackView(Context context) {

super(context);

init();

}

public SawtoothBlackView(Context context, AttributeSet attrs) {

super(context, attrs);

init();

}

@TargetApi(Build.VERSION_CODES.LOLLIPOP)

public SawtoothBlackView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {

super(context, attrs, defStyleAttr, defStyleRes);

init();

}

public SawtoothBlackView(Context context, AttributeSet attrs, int defStyleAttr) {

super(context, attrs, defStyleAttr);

init();

}

private void init(){

dm= new DisplayMetrics();

((Activity)getContext()).getWindowManager().getDefaultDisplay().getMetrics(dm);

paint = new Paint();

//是否设置抗锯齿效果

paint.setAntiAlias(true);

//paint.setStyle(Paint.Style.STROKE);

paint.setColor(getResources().getColor(R.color.black));

//paint.setTextSize((float) 2.0);

//paint.setStrokeWidth(3);

this.big_heigth = (int) (30*dm.density);

this.big_width = dm.widthPixels;

this.triangle_width= (int) (20*dm.density);

this.triangle_height=(int)(10*dm.density);

}

@Override

protected void onDraw(Canvas canvas) {

Path path = new Path(); //定义一条路径

/**

* 首先画出定点距离然后根据小角的宽度计算花多少次角

* 解决铺不满的问题

* 余数除以画的角的数量

* 然后画每个角的时候加

* 保证能铺满

*/

if(state) {

path.moveTo(0, 0);

path.lineTo(0, big_heigth);

int i = 1;

int remainder= big_width%triangle_width;

int lineCount=big_width /triangle_width*2;

for (; i <= lineCount; i++) {

path.lineTo((triangle_width / 2+((float)remainder/(float) lineCount)) * i, i % 2 == 0 ? big_heigth : big_heigth - triangle_height);

}

path.lineTo((triangle_width / 2+((float)remainder/(float) lineCount)) * (i > 1 ? i - 1 : i), 0);

path.lineTo(0, 0);

}else{

path.moveTo(0,0);

int i=1;

int remainder= big_width%triangle_width;

int lineCount=big_width /triangle_width*2;

//path.lineTo(triangle_width/2*i+remainder,i%2==0?0:triangle_height);

for(; i< lineCount; i++){

path.lineTo( ((triangle_width/2+((float)remainder/(float) lineCount))*i),i%2==0?0:triangle_height);

}

path.lineTo(big_width,0);

path.lineTo(big_width, big_heigth);

//path.lineTo(dm.widthPixels, big_heigth);

path.lineTo(0, big_heigth);

path.lineTo(0,0);

}

canvas.drawPath(path, paint);

}

}

使用

android:layout_width="match_parent"

android:layout_height="30dp"

android:id="@+id/sawtooth"

/>

默认是占满全屏幕的

修改参数参照

SawtoothBlackView sawtooth1= (SawtoothBlackView) findViewById(R.id.sawtooth1);

sawtooth1.setState(false);