预览效果图如下：
主要的方法是重写view.ontouchevent( motionevent event ) , 常用的三个操作：action_down 手指触摸屏幕 ; action_up 手指离开屏幕;
action_move手指在屏幕滑动。
如果该方法返回true ，表示该事件已经被view处理，不再向上层的view或activity传递 ； 如果返回false， 表示事件未处理，继续传递。
具体代码如下:
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package com.ninegrid;
import android.content.context;
import android.graphics.canvas;
import android.graphics.color;
import android.graphics.paint;
import android.util.attributeset;
import android.view.motionevent;
import android.view.view;
/**
* created by administrator on 2017/6/24.
*/
public class suduview extends view {
//定义默认常量
private static final int default_cell_width = 200 ;
private static final int default_cell_stroke_width = 10 ;
private static final int default_space = 100 ;
//九宫格数组
private cell mcells[] = new cell[9] ;
//直径
private int mcellwidth;
//半径
private int mcellradius;
//边框宽度
private int mcellstrokewidth;
//空白部分
private int mspace ;
//定义画笔
private paint mpaintnormal ;
private paint mpaintselected ;
private float mcurrentx ;
private float mcurrenty ;
//判断是否结束的标识
private boolean mfinish = false ;
private stringbuffer msbselected = new stringbuffer(20);
public suduview(context context) {
super(context);
init();
}
public suduview(context context, attributeset attrs) {
super(context, attrs);
init();
}
public suduview(context context, attributeset attrs, int defstyleattr) {
super(context, attrs, defstyleattr);
init();
}
private void init(){
//初始化画笔
mcellwidth = default_cell_width ;
mcellradius = default_cell_width >> 1 ;
mcellstrokewidth = default_cell_stroke_width ;
mspace = default_space ;
mpaintnormal = new paint();
mpaintnormal.setcolor(color.white);
mpaintnormal.setstrokewidth(mcellstrokewidth);
mpaintnormal.setstyle(paint.style.stroke);
mpaintnormal.setantialias(true);
mpaintselected = new paint();
mpaintselected.setcolor(color.cyan);
mpaintselected.setstrokewidth(mcellstrokewidth);
mpaintselected.setstyle(paint.style.stroke);
mpaintselected.setantialias(true);
cell cell ;
float x;
float y;
//计算每个格子的坐标
for( int i = 0 ; i < 9 ; i ++ ){
x = mspace * ( i%3 + 1 ) + mcellradius + mcellwidth * ( i%3 ) ;
y = mspace * ( i/3 + 1 ) + mcellradius + mcellwidth * ( i/3 ) ;
cell = new cell(x , y);
mcells[i] = cell ;
}
}
@override
protected void ondraw(canvas canvas) {
super.ondraw(canvas);
drawcell(canvas);
drawline(canvas);
}
//绘制连接线
private void drawline( canvas canvas ){
if("".equals(msbselected.tostring())){
return;
}
string[] selectedindexs = msbselected.tostring().split(",");
cell cell = mcells[integer.valueof(selectedindexs[0])];
cell nextcell ;
//绘制每两个格子中心点之间的连接线
if( selectedindexs.length > 1) {
for (int i = 1; i < selectedindexs.length; i++) {
nextcell = mcells[integer.valueof(selectedindexs[i])];
canvas.drawline(cell.getcenterx(), cell.getcentery(), nextcell.getcenterx(), nextcell.getcentery(), mpaintselected);
cell = nextcell;
}
}
//绘制格子到其他空白位置的连接线
if( !mfinish ) {
canvas.drawline(cell.getcenterx(), cell.getcentery(), mcurrentx, mcurrenty, mpaintselected);
}
}
private void drawcell( canvas canvas ){
for ( int i = 0 ; i < 9 ; i ++ ){
canvas.drawcircle(mcells[i].getcenterx(), mcells[i].getcentery() , mcellradius ,
mcells[i].isselected() ? mpaintselected : mpaintnormal );
}
}
//处理点击事件
@override
public boolean ontouchevent(motionevent event) {
switch ( event.getaction()){
case motionevent.action_down:
//如果手指已经松开，则所有格子变为初始状态
if( mfinish ){
for ( int i = 0 ; i < 9 ; i ++ ){
mcells[i].setselected(false);
}
mfinish = false ;
msbselected.delete(0,msbselected.length());
invalidate();
return false;
}
handledownevent(event);
break;
//松开则结束
case motionevent.action_up:
mfinish = true ;
break;
case motionevent.action_move:
handlemoveevent(event);
break;
}
//表示已处理，不向上传递
return true ;
}
//处理手指移动的事件
private void handlemoveevent( motionevent event ){
int index = findcellindex(event.getx(),event.gety());
if( index != -1 ){
mcells[index].setselected(true);
msbselected.append(index).append(",");
}
invalidate();
mcurrentx = event.getx();
mcurrenty = event.gety();
}
//处理手指按下的事件
private void handledownevent( motionevent event){
int index = findcellindex(event.getx(),event.gety());
if( index != -1 ){
mcells[index].setselected(true);
msbselected.append(index).append(",");
invalidate();
}
mcurrentx = event.getx();
mcurrenty = event.gety();
}
//根据坐标判断点击的哪个格子
private int findcellindex( float x , float y){
float cellx ;
float celly ;
int result = -1 ;
for( int i = 0 ; i < 9 ; i ++ ){
if( mcells[i].isselected()){
continue;
}
//获取每个格子的坐标
cellx = mcells[i].getcenterx();
celly = mcells[i].getcentery();
//计算按下的点到每个格子的距离
float tempx = cellx - x ;
float tempy = celly - y ;
float distance = (float) math.sqrt(tempx * tempx + tempy * tempy);
//如果点击的位置在某个格子的圆内
if( distance < mcellradius ){
result = i ;
break;
}
}
//返回该格子的位置
return result ;
}
}
最后在布局文件中引用该view即可，若想实现更高的定制性，可以仿照上一篇文章重写view的onmearsure方法并增加自定义属性。
以上所述是小编给大家介绍的android 自定义九宫格手势锁，希望对大家有所帮助
如对本文有疑问， 点击进行留言回复！！
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