自定义View

自定义View类

public class MyView extends View {    private String mytext;    private int color;    private int distance;    public MyView(Context context) {        this(context, null);    }    public MyView(Context context, AttributeSet attrs) {        this(context, attrs, 0);    }    //AttributeSet 属性    //defStyleAttr 默认的一个主题    public MyView(Context context, AttributeSet attrs, int defStyleAttr) {        this(context, attrs, defStyleAttr, 0);        TypedArray typedArray = context.obtainStyledAttributes(attrs, R.styleable.MyView);        mytext = typedArray.getString(R.styleable.MyView_myText);        color = typedArray.getColor(R.styleable.MyView_myColor, Color.BLUE);        distance = typedArray.getInt(R.styleable.MyView_distance, 0);        //释放资源        typedArray.recycle();    }    public MyView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {        super(context, attrs, defStyleAttr, defStyleRes);    }    //测量    @Override    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {        super.onMeasure(widthMeasureSpec, heightMeasureSpec);        int width = 0;        int height = 0;        int widtMode = MeasureSpec.getMode(widthMeasureSpec);        int widthsize = MeasureSpec.getSize(widthMeasureSpec);        int heightMode = MeasureSpec.getMode(heightMeasureSpec);        int heightsize = MeasureSpec.getSize(heightMeasureSpec);        if (widtMode == MeasureSpec.EXACTLY && heightMode == MeasureSpec.EXACTLY) {            width = widthsize;            height = heightsize;        } else {            width = 400;            height = 500;        }        setMeasuredDimension(width, height);    }    //布局 位置    @Override    protected void onLayout(boolean changed, int left, int top, int right, int bottom) {        super.onLayout(changed, left, top, right, bottom);    }    //绘画    @Override    protected void onDraw(Canvas canvas) {        super.onDraw(canvas);//      Paint paint = new Paint();//      paint.setColor(Color.RED);//      //设置镂空//      paint.setStyle(Paint.Style.STROKE);//      canvas.drawCircle(300f,300f,200,paint);//      canvas.drawARGB(200,100,200,100);//      canvas.drawLine(300f,300f,500f,500f,paint);        //设置椭圆//        Paint paint1 =new Paint();//        paint1.setColor(Color.RED);//        canvas.drawArc(100f,100f,500f,500f,0f,45f,true,paint1);//        Paint paint2 =new Paint();//        paint2.setColor(Color.BLUE);//        canvas.drawArc(100f,100f,500f,500f,45f,45f,true,paint2);//        Paint paint3 =new Paint();//        paint3.setColor(Color.GREEN);//        canvas.drawArc(100f,100f,500f,500f,90f,130f,true,paint3);//        Paint paint4 =new Paint();//        paint4.setColor(Color.YELLOW);//        canvas.drawArc(100f,100f,500f,500f,220f,90f,true,paint4);//        Paint paint5 =new Paint();//        paint5.setColor(Color.BLACK);//        canvas.drawArc(100f,100f,500f,500f,310f,50f,true,paint5);        //控件屏幕高度        int measuredHeight = getMeasuredHeight() / 2;        //控件屏幕宽度        int measuredWidth = getMeasuredWidth() / 2;        //设置空间背景颜色//        canvas.drawColor(Color.BLUE);        Paint paint = new Paint();        //设置字体颜色//        paint.setColor(Color.RED);        paint.setColor(color);        paint.setTextSize(100);        //设置控件的水平居中        paint.setTextAlign(Paint.Align.CENTER);        Paint.FontMetricsInt fm = paint.getFontMetricsInt();        //获取center线        int baseLineY = (fm.bottom - fm.top) / 2 - fm.bottom;        canvas.drawText(mytext, measuredWidth, measuredHeight + baseLineY, paint);        canvas.drawText("BBBB", measuredWidth, measuredHeight + distance, paint);    }

新建MyLinearLayout:

public class MyLinearLayout extends LinearLayout {    private int marginTop = 50;    private int marginleft = 50;    private int marginBottom = 50;    private int marginRight = 50;    private int oritation = 1;    public MyLinearLayout(Context context) {        this(context, null);    }    public MyLinearLayout(Context context, AttributeSet attrs) {        this(context, attrs, 0);    }    public MyLinearLayout(Context context, AttributeSet attrs, int defStyleAttr) {        super(context, attrs, defStyleAttr);    }    public MyLinearLayout(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {        super(context, attrs, defStyleAttr, defStyleRes);    }    @Override    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {        super.onMeasure(widthMeasureSpec, heightMeasureSpec);        int width = 0;        int height = 0;        int widtMode = MeasureSpec.getMode(widthMeasureSpec);        int widthsize = MeasureSpec.getSize(widthMeasureSpec);        int heightMode = MeasureSpec.getMode(heightMeasureSpec);        int heightsize = MeasureSpec.getSize(heightMeasureSpec);        if (widtMode == MeasureSpec.EXACTLY && heightMode == MeasureSpec.EXACTLY) {            width = widthsize;            height = heightsize;        } else {            for (int i = 0; i < getChildCount(); i++) {                int measuredWidth = getChildAt(i).getMeasuredWidth();                int measuredHeight = getChildAt(i).getMeasuredHeight();                if (oritation == 0) {                    height = measuredHeight + marginTop + marginBottom;                    if (i == 0) {                        width += measuredWidth + marginleft + marginRight;                    } else {                        width += measuredWidth + marginleft;                    }                } else if (oritation == 1) {                    width = measuredWidth + marginleft + marginRight;                    if (i == 0) {                        height += measuredHeight + marginTop + marginBottom;                    } else {                        height += measuredHeight + marginBottom;                    }                }            }        }        setMeasuredDimension(width, height);    }    @Override    protected void onLayout(boolean changed, int l, int t, int r, int b) {        int left = marginleft;        int top = marginTop;        int bottom = marginBottom;        int right = marginRight;        for (int i = 0; i < getChildCount(); i++) {            int measuredWidth = getChildAt(i).getMeasuredWidth();            int measuredHeight = getChildAt(i).getMeasuredHeight();            if (oritation == 0) {                if (i == 0) {                    right = right + measuredWidth;                } else {                    right = right + measuredWidth + marginRight;                }                getChildAt(i).layout(left, top, right, measuredHeight + top);                if (i == 0) {                    left = left + right;                } else {                    left = right + marginRight;                }            } else if (oritation == 1) {                if (i == 0) {                    bottom = bottom + measuredHeight;                } else {                    bottom = bottom + measuredHeight + marginBottom;                }                getChildAt(i).layout(left, top, measuredWidth + left, bottom);                if (i == 0) {                    top = top + bottom;                } else {                    top = bottom + marginBottom;                }            }        }    }    @Override    protected void onDraw(Canvas canvas) {        super.onDraw(canvas);    }}