我们在安卓开发中安卓自带的控件满足不了我们的需求，因此我们就需要用到自定义View来满足我们的需求，在这里我要讲解的是自定义View实现选座功能，在安卓中一个会使用自定义View的人一定会开发出与众不同以及美观的项目
首先，我展示一下效果
以上主要就是我们需要创建一个我们自己的View继承自Viewgroup控件并实现onMeasure以及onDraw方法
具体的代码是这样的
public class SearView extends ViewGroup {
private Context context;
public SearView(@NonNull Context context) {
super(context);
}
public SearView(@NonNull Context context, @Nullable AttributeSet attrs) {
super(context, attrs);
this.context=getContext();
}
public SearView(@NonNull Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
}
@Override
protected void onLayout(boolean changed, int l, int t, int r, int b) {
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}
private ArrayList<SeatinfoBean.ResultBean> mlist;
public void setData(ArrayList<SeatinfoBean.ResultBean> list){
this.mlist = list;
invalidate();
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
if (mlist != null && mlist.size() > 0) {
for (int i = 0; i < mlist.size(); i++) {
SeatinfoBean.ResultBean resultBean = mlist.get(i);
resultBean.draw(canvas,context);
}
}
}
@Override
public boolean onTouchEvent(MotionEvent event) {
switch (event.getAction()){
case MotionEvent.ACTION_DOWN:
break;
case MotionEvent.ACTION_MOVE:
break;
case MotionEvent.ACTION_UP:
float x = event.getX();
float y = event.getY();
completeByXY(x,y);
break;
}
return true;
}
public void completeByXY(float x,float y){
for (int i=0;i<mlist.size();i++){
SeatinfoBean.ResultBean resultBean1 = mlist.get(i);
int left = resultBean1.getLeft();
int right = resultBean1.getRight();
int bottom = resultBean1.getBottom();
int top = resultBean1.getTop();
if (x>=left&&x<right&&y>=top&&y<=bottom){
clickedSeat.clickedSeat(resultBean1);
int status = resultBean1.getStatus();
if (status==1){
status=3;
resultBean1.setStatus(status);
}else if (status==3){
status=1;
resultBean1.setStatus(status);
}
break;
}
}
postInvalidate();
}
public interface ClickedSeat{
void clickedSeat(SeatinfoBean.ResultBean resultBean);
}
private ClickedSeat clickedSeat;
public void setClickedSeat(ClickedSeat clickedSeat) {
this.clickedSeat = clickedSeat;
}
}
以上的resultBean是我们根据选座接口中的返回值判断座位是否已经被选，大家可以参考一下我的Bean类，但具体的做法还要以自己的接口文件为主
public static class ResultBean {
/**
* row : 1
* seat : 1
* status : 2
*/
private String row;
private String seat;
private int status;
private int left;
private int top;
private int right;
private int bottom;
private Context context;
private boolean ist = false;
public String getRow() {
return row;
}
public void setRow(String row) {
this.row = row;
}
public String getSeat() {
return seat;
}
public void setSeat(String seat) {
this.seat = seat;
}
public int getStatus() {
return status;
}
public void setStatus(int status) {
this.status = status;
}
public int getLeft() {
return left;
}
public void setLeft(int left) {
this.left = left;
}
public int getTop() {
return top;
}
public void setTop(int top) {
this.top = top;
}
public int getRight() {
return right;
}
public void setRight(int right) {
this.right = right;
}
public int getBottom() {
return bottom;
}
public void setBottom(int bottom) {
this.bottom = bottom;
}
public Context getContext() {
return context;
}
public void setContext(Context context) {
this.context = context;
}
public boolean isIst() {
return ist;
}
public void setIst(boolean ist) {
this.ist = ist;
}
public void draw(Canvas canvas,Context context){
if (status==2){
BitmapDrawable drawable = (BitmapDrawable) context.getResources().getDrawable(R.drawable.xuan);
Bitmap bitmap = drawable.getBitmap();
int width = bitmap.getWidth();
int height = bitmap.getHeight();
int row = Integer.parseInt(getRow());
int seat = Integer.parseInt(getSeat());
row = row*50;
seat = seat*50;
canvas.drawBitmap(bitmap,seat,row,new Paint());
left = seat;
top = row;
right = seat+width;
bottom = row+height;
}
if (status==1){
BitmapDrawable drawable = (BitmapDrawable) context.getResources().getDrawable(R.drawable.xuan1);
Bitmap bitmap = drawable.getBitmap();
int width = bitmap.getWidth();
int height = bitmap.getHeight();
int row = Integer.parseInt(getRow());
int seat = Integer.parseInt(getSeat());
row = row*50;
seat = seat*50;
canvas.drawBitmap(bitmap,seat,row,new Paint());
left = seat;
top = row;
right = seat+width;
bottom = row+height;
}
if (status==3){
BitmapDrawable drawable = (BitmapDrawable) context.getResources().getDrawable(R.drawable.xuan3);
Bitmap bitmap = drawable.getBitmap();
int width = bitmap.getWidth();
int height = bitmap.getHeight();
int row = Integer.parseInt(getRow());
int seat = Integer.parseInt(getSeat());
row = row*50;
seat = seat*50;
canvas.drawBitmap(bitmap,seat,row,new Paint());
left = seat;
top = row;
right = seat+width;
bottom = row+height;
}
}
}
}
最后，我们需要在布局文件里进行调用，我的布局文件是这样的
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".activity.XuanZuoActivity"
android:orientation="vertical">
<TextView
android:id="@+id/xuanzuotext"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="请开始选座购票"
android:background="#140404"
android:gravity="center"
android:textSize="@dimen/permission_dp_30"
android:textColor="#fff"/>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:background="#140404">
<TextView
android:id="@+id/weixuan"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="未选座"
android:textColor="#fff"
android:layout_marginLeft="@dimen/permission_dp_20"
android:layout_marginTop="@dimen/dp_3"/>
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/xuan1"/>
<TextView
android:id="@+id/weixuan2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="已选座"
android:textColor="#fff"
android:layout_marginLeft="@dimen/dp_210"
android:layout_marginTop="@dimen/dp_3"/>
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/xuan"/>
</LinearLayout>
<com.bw.movie.SearView
android:id="@+id/xuanzuo"
android:background="#140404"
android:layout_width="match_parent"
android:layout_height="@dimen/dp_0"
android:layout_weight="6"
/>
<Button
android:id="@+id/button_xuanzuo"
android:layout_width="match_parent"
android:layout_height="@dimen/dp_0"
android:layout_weight="0.5"
android:text="立即支付"
android:background="#E91E63"/>
</LinearLayout>
以上就是我的选座功能实现的全过程，欢迎大家提问
总结
