首先我们先介绍组合View:
public class MyXHView extends LinearLayout {
private EditText mEditText;
private TextView mCancel;
public MyXHView(Context context, AttributeSet attrs) {
super(context, attrs);
LayoutInflater.from(context).inflate(R.layout.header_view, this);
mEditText = findViewById(R.id.Search_Edit);
mCancel = findViewById(R.id.Cancel_Text);
}
public String getEditStr() {
return mEditText.getText().toString();
}
public TextView getmCancel() {
return mCancel;
}
}
ball:
public class BallView extends View {
private Paint paint;
Context context;
//圆的初始位置坐标
private int x = 38;
private int y = 38;
private int radius = 35; //圆半径
public BallView(Context context, AttributeSet attrs) {
super(context, attrs);
this.context = context;
}
/**
* 实现onDraw()方法实现绘图操作
*
* @param canvas
*/
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
//用canvas将屏幕设为白色
canvas.drawColor(Color.WHITE);
//设置画笔颜色为红色
paint = new Paint();
paint.setColor(Color.RED);
//设置消除锯齿
paint.setAntiAlias(true);
//使用画笔绘制圆为小球
//x :圆心的x坐标
//y :圆心的y坐标
//radius :圆的半径
//paint :画笔
canvas.drawCircle(x, y, radius, paint);
}
//实现onTouchEvent方法,处理触摸事件
@Override
public boolean onTouchEvent(MotionEvent event) {
//判断触摸点
switch (event.getAction()) {
//实现MotionEvent.ACTION_DOWN,记录按下的x,y坐标:getRawX()和getRawY()获得的是相对屏幕的位置
case MotionEvent.ACTION_DOWN:
x = (int) event.getX();
y = (int) event.getY();
System.out.println("按下时: " + "x坐标:" + event.getRawX() + " " + "y坐标:" + event.getRawY());
//实现MotionEvent.ACTION_MOVE 记录移动的x,y坐标:getRawX()和getRawY()获得的是相对屏幕的位置
case MotionEvent.ACTION_MOVE:
x = (int) event.getX();
y = (int) event.getY();
System.out.println("移动时: " + "x坐标:" + event.getRawX() + " " + "y坐标:" + event.getRawY());
//实现MotionEvent.ACTION_UP 记录抬起的x,y坐标
case MotionEvent.ACTION_UP:
// 获取当前触摸点的x,y坐标,为X轴和Y轴坐标重新赋值:getX()和getY()获得的永远是view的触摸位置坐标
x = (int) event.getX();
y = (int) event.getY();
System.out.println("抬起时: " + "x坐标:" + event.getRawX() + " " + "y坐标:" + event.getRawY());
break;
}
//获取屏幕宽高
WindowManager manager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
int width = manager.getDefaultDisplay().getWidth();
int height = manager.getDefaultDisplay().getHeight();
//修正圆点坐标,重新绘制圆 ,控制小球不会被移出屏幕
if (x >= 18 && y >= 18 && x <= width - 18 && y <= height - 18) {
/**
* Android提供了Invalidate方法实现界面刷新,但是Invalidate不能直接在线程中调用,因为他是违背了单线程模型:
1. Android UI操作并不是线程安全的,并且这些操作必须在UI线程中调用。
invalidate()是用来刷新View的,必须是在UI线程中进行工作。比如在修改某个view的显示时,调用invalidate()才能看到重新绘制的界面。invalidate()的调用是把之前的旧的view从主UI线程队列中pop掉。
2.Android 程序默认情况下也只有一个进程,但一个进程下却可以有许多个线程。在这么多线程当中,把主要是负责控
制UI界面的显示、更新和控件交互的线程称为UI线程,由于onCreate()方法是由UI线程执行的,所以也可以把UI线程理解
为主线程。其余的线程可以理解为工作者线程。invalidate()得在UI线程中被调动,在工作者线程中可以通过Handler来通
知UI线程进行界面更新。而postInvalidate()在工作者线程中被调用。
*/
//使用 postInvalidate()方法实现重绘小球,跟随手指移动
// postInvalidate();
postInvalidate();
}
/*
* 备注:此处一定要将return super.onTouchEvent(event)修改为return true,原因是:
* 1)父类的onTouchEvent(event)方法可能没有做任何处理,但是返回了false。
* 2)一旦返回false,在该方法中再也不会收到MotionEvent.ACTION_MOVE及MotionEvent.ACTION_UP事件。
*/
//return super.onTouchEvent(event);
return true;
}
}
每点击一次+1:
public class CounterView extends View implements View.OnClickListener {
private Paint mPaint;
private Rect mRect;
// 计数值,每点击一次本控件,其值增加1
private int mCount;
public CounterView(Context context, AttributeSet attrs) {
super(context, attrs);
mPaint = new Paint();
mRect = new Rect();
setOnClickListener(this);
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
mPaint.setColor(Color.RED);
canvas.drawRect(0, 0, getWidth(), getHeight(), mPaint);
String text = String.valueOf(mCount);
mPaint.setColor(Color.YELLOW);
mPaint.setTextSize(50);
mPaint.getTextBounds(text, 0, text.length(), mRect);
int width = mRect.width();
int height = mRect.height();
canvas.drawText(text, getWidth() / 2 - width / 2, getHeight() / 2 + height / 2, mPaint);
Log.e("getWidth", getWidth() + "");
Log.e("getHeight", getHeight() + "");
Log.e("height", height + "");
}
@Override
public void onClick(View v) {
mCount++;
invalidate();
}
}
画环画圆 myView:
先在values建立xml文件:
<attr name="textSize" format="dimension" />
<attr name="text" format="string" />
<attr name="circleColor" format="color" />
<attr name="arcColor" format="color" />
<attr name="textColor" format="color" />
<attr name="startAngle" format="integer" />
<attr name="sweepAngle" format="integer" />
</declare-styleable>
然后在布局中:
android:layout_width="match_parent"
android:layout_height="match_parent"
app:startAngle="0"
app:sweepAngle="270"
app:text="hehe"
app:textSize="30sp"
app:textColor="@color/colorPrimaryDark"
app:circleColor="@color/colorPrimary"
app:arcColor="@color/colorAccent"
- 自己在value文件夹下新建attrs文件 就可以在它里面定义自己想要的属性了
- 咱们自定义View初始化的东西要放到构造函数之后执行
- 因为我们自己写的View执行顺序
- 1:构造方法
- 2:测量
*/
public class MyView extends View {
private String text;
private int circleColor;
private int arcColor;
private int textColor;
private float textSize;
private int startAngle;
private int sweepAngle;
private int mCircleXY;
private float mRadius;
private Paint mCirclePaint;
private RectF mRectF;
private Paint mArcPaint;
private Paint mTextPaint;
public MyView(Context context, AttributeSet attrs) {
super(context, attrs);
//得到我们自己定义的属性集合
TypedArray ta = context.obtainStyledAttributes(attrs, R.styleable.MyView);
if (ta != null) {
//两个参数 参数1:R.styleable.MyView_circleColor 代表的咱们自己定义属性集合
//参数2:如果你在布局文件里面没有添加定义的属性 就给一个默认值
circleColor = ta.getColor(R.styleable.MyView_circleColor, 0);
arcColor = ta.getColor(R.styleable.MyView_arcColor, 0);
textColor = ta.getColor(R.styleable.MyView_textColor, 0);
textSize = ta.getDimension(R.styleable.MyView_textSize, 50);
text = ta.getString(R.styleable.MyView_text);
startAngle = ta.getInt(R.styleable.MyView_startAngle, 0);
sweepAngle = ta.getInt(R.styleable.MyView_sweepAngle, 90);
ta.recycle();
Log.e("text", text);
}
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
drawSth(canvas);
}
private void drawSth(Canvas canvas) {
init();
canvas.drawCircle(mCircleXY, mCircleXY, mRadius, mCirclePaint);
canvas.drawArc(mRectF, startAngle, sweepAngle, false, mArcPaint);
canvas.drawText(text, 0, text.length(), mCircleXY, mCircleXY + textSize
/ 4, mTextPaint);
}
private void init() {
//getWidth() 得到当前这个空间宽和高
int length = Math.min(getWidth(), getHeight());
Log.e("看看宽和高", "宽度:" + getWidth() + "高度:" + getHeight());
mCircleXY = length / 2;
mRadius = length * 0.5f / 2;
mCirclePaint = new Paint(Paint.ANTI_ALIAS_FLAG);
mCirclePaint.setColor(circleColor);
mRectF = new RectF(length * 0.1f, length * 0.1f, length * 0.9f,
length * 0.9f);
mArcPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
mArcPaint.setColor(arcColor);
mArcPaint.setStyle(Paint.Style.STROKE);
mArcPaint.setStrokeWidth((getWidth() * 0.1f));
mTextPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
mTextPaint.setTextSize(textSize);
mTextPaint.setColor(textColor);
mTextPaint.setTextAlign(Paint.Align.CENTER);
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
Log.e("onMeasure", "onMeasure");
}
}