自定义view继承view

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Myview类继承view

public class Myview extends View {    Paint paint;//画笔    Region region;//圆形区域    Path path;//圆形路径    int x;    int y;    Path fpath;//矩形路径    Region fregson;//矩形区域    Path ypath;//圆形路径    Region yregion;//圆形区域    onmyclick listener;    public void Myview(onmyclick listener) {        this.listener = listener;    }    /**     * 一个参数     *     * @param     */    public Myview(Context context) {        super(context);        init();    }    private void init() {        paint = new Paint();//初始化画笔        region = new Region();//圆形的区域        path = new Path();//圆形的路径        fpath = new Path();//矩形路径        fregson = new Region();//矩形区域        ypath = new Path();//小圆形的路径        yregion = new Region();//小圆形的区域    }    @Override    public boolean onTouchEvent(MotionEvent event) {        if (event.getAction() == MotionEvent.ACTION_DOWN) {            //获取点击坐标            int x = (int) event.getX();            int y = (int) event.getY();            //判断点击区域            //小园内            if (yregion.contains(x, y)) {                if (listener != null) {                    listener.onint(this);                }                //大圆外            } else if (fregson.contains(x, y)) {                if (listener != null) {                    listener.onout(this);                }                //小圆外            } else if (region.contains(x, y)) {                if (listener != null) {                    listener.xy(this);                }                //空白            } else {                if (listener != null) {                    listener.onkb(this);                }            }        }        return super.onTouchEvent(event);    }    //监听事件    public interface onmyclick {        //小圆内        void onint(View v);        //大圆外        void onout(View v);        //小圆外        void xy(View v);        //空白        void onkb(View v);    }    @Override    protected void onSizeChanged(int w, int h, int oldw, int oldh) {        super.onSizeChanged(w, h, oldw, oldh);        //绘制圆的路径        x = w / 2;//圆心的横坐标        y = h / 2;//圆心的纵坐标        int r = 200;//圆的半径        path.addCircle(x, y, r, Path.Direction.CW);        fpath.addRect(x - r, y - r, x + r, y + r, Path.Direction.CW);        int rr = 50;        ypath.addCircle(x, y, rr, Path.Direction.CW);        Region region1 = new Region(0, 0, w, h);        region.setPath(path, region1);//圆形区域        fregson.setPath(fpath, region1);//矩形区域        yregion.setPath(ypath, region1);//小圆区域    }    /**     * 绘制     *     * @param canvas     */    @Override    protected void onDraw(Canvas canvas) {        super.onDraw(canvas);        Path ppath = fpath;        paint.setColor(Color.RED);        canvas.drawPath(ppath, paint);        Path tpath = path; //圆的路径        paint.setColor(Color.BLACK);//黑色画笔        canvas.drawPath(tpath, paint);        Path xpath = ypath;        paint.setColor(Color.GREEN);        canvas.drawPath(xpath, paint);        //绘制文字        paint.setColor(Color.YELLOW);        paint.setTextAlign(Paint.Align.CENTER);        paint.setTextSize(20);//字体大小        canvas.drawText("圆心", x, y, paint);    }    /**     * 布局     *     * @param changed     * @param left     * @param top     * @param right     * @param bottom     */    @Override    protected void onLayout(boolean changed, int left, int top, int right, int bottom) {        super.onLayout(changed, left, top, right, bottom);    }    /**     * 测量     *     * @param widthMeasureSpec     * @param heightMeasureSpec     */    @Override    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {        super.onMeasure(widthMeasureSpec, heightMeasureSpec);    }    /**     * 两个参数     *     * @param context     * @param attrs     */    public Myview(Context context, @Nullable AttributeSet attrs) {        super(context, attrs);        init();    }}

在activity_main布局里设置自己的自定义view

 <com.example.myview.Myview         android:id="@+id/myview"         android:layout_width="match_parent"         android:layout_height="match_parent" />

这个类里获取id和监听

public class MainActivity extends AppCompatActivity implements Myview.onmyclick{Myview myView;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        myView=(Myview)findViewById(R.id.myview);        myView.Myview(this);    }    @Override    public void onint(View v) {        Toast.makeText(this,"小园内",Toast.LENGTH_LONG).show();    }    @Override    public void onout(View v) {        Toast.makeText(this,"大园外",Toast.LENGTH_LONG).show();    }    @Override    public void xy(View v) {        Toast.makeText(this,"小园外",Toast.LENGTH_LONG).show();    }    @Override    public void onkb(View v) {        Toast.makeText(this,"空白",Toast.LENGTH_LONG).show();    }}

效果图

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