Android自定义TextView

概述1.自定义属性新建attrs.xml文件（res->values->attrs.xml），定义要自定义的TextView属性<?xmlversion="1.0"encoding="utf-8"?><resources><declare-styleablename="MyTextView"><!--name属性名称format格式-->

1.自定义属性

新建attrs.xml文件（res->values->attrs.xml），定义要自定义的TextVIEw属性

<?xml version="1.0" enCoding="utf-8"?><resources>    <declare-styleable name="MyTextVIEw">        <!--name 属性名称 format 格式-->        <attr name="myText" format="string" />        <attr name="myTextcolor" format="color" />        <attr name="myTextSize" format="dimension" />    </declare-styleable></resources>

2.在布局中使用，对比系统TextVIEw

<?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"    androID:orIEntation="vertical"    tools:context=".MainActivity">    <com.future.Coding.custom_vIEw.MyTextVIEw        androID:layout_wIDth="wrap_content"        androID:layout_height="wrap_content"        androID:padding="10dp"        app:myText="American PresIDential Election"        app:myTextcolor="#D81B60"        app:myTextSize="16sp" />    <!--与上面自定义TextVIEw的对比-->    <TextVIEw        androID:layout_wIDth="wrap_content"        androID:layout_height="wrap_content"        androID:padding="10dp"        androID:text="American PresIDential Election"        androID:textcolor="#D81B60"        androID:textSize="16sp" /></linearLayout>

3.通过继承VIEw，实现自定义TextVIEw

public class MyTextVIEw extends VIEw {    private String mText;    private int mTextSize = 16;    private int mTextcolor = color.BLACK;    private Paint mPaint;    private static final String TAG = "MyTextVIEw";    //在代码中使用    public MyTextVIEw(Context context) {        this(context, null);    }    //在布局layout中使用    public MyTextVIEw(Context context, @Nullable AttributeSet attrs) {        this(context, attrs, 0);    }    //在布局layout中使用，但会有style    public MyTextVIEw(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {        super(context, attrs, defStyleAttr);        //获取自定义属性        TypedArray typedArray = context.obtainStyledAttributes(attrs, R.styleable.MyTextVIEw);        mText = typedArray.getString(R.styleable.MyTextVIEw_myText);        mTextcolor = typedArray.getcolor(R.styleable.MyTextVIEw_myTextcolor, mTextcolor);        Log.d(TAG, "MyTextVIEw: " + sp2px(mTextSize));        mTextSize = typedArray.getDimensionPixelSize(R.styleable.MyTextVIEw_myTextSize, sp2px(mTextSize));        /**         * 解析：TypedArray 为什么需要调用recycle()         * https://blog.csdn.net/Monicabg/article/details/45014327         */        typedArray.recycle();        mPaint = new Paint();        mPaint.setAntiAlias(true);//抗锯齿        mPaint.setTextSize(mTextSize);        mPaint.setcolor(mTextcolor);    }    private int sp2px(int sp) {        return (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP, sp,                getResources().getdisplayMetrics());    }    /**     * 自定义view的测量方法     *     * @param wIDthMeasureSpec     * @param heightmeasureSpec     */    @OverrIDe    protected voID onMeasure(int wIDthMeasureSpec, int heightmeasureSpec) {        super.onMeasure(wIDthMeasureSpec, heightmeasureSpec);        //指定控件的宽高，需要测量        int wIDthMode = MeasureSpec.getMode(wIDthMeasureSpec);        int heightmode = MeasureSpec.getMode(heightmeasureSpec);        int wIDthSize = MeasureSpec.getSize(wIDthMeasureSpec);        int heightSize = MeasureSpec.getSize(heightmeasureSpec);        if (wIDthMode == MeasureSpec.AT_MOST) {//在布局中指定了wrap_content            Rect bounds = new Rect();            mPaint.getTextBounds(mText, 0, mText.length(), bounds);            wIDthSize = bounds.wIDth() + getpaddingleft() + getpaddingRight();        } else if (wIDthMode == MeasureSpec.EXACTLY) {//在布局中指定了确定的值 比如:100dp / match_parent        } else if (wIDthMode == MeasureSpec.UnspecIFIED) {//尽可能的大，很少能用到            //ListVIEw、ScrollVIEw在测量子布局的时候会用        }        if (heightmode == MeasureSpec.AT_MOST) {//在布局中指定了wrap_content            Rect bounds = new Rect();            mPaint.getTextBounds(mText, 0, mText.length(), bounds);            heightSize = bounds.height() + getpaddingtop() + getpaddingBottom();        } else if (heightmode == MeasureSpec.EXACTLY) {//在布局中指定了确定的值  比如:100dp / match_parent        } else if (heightmode == MeasureSpec.UnspecIFIED) {//尽可能的大，很少能用到            //ListVIEw、ScrollVIEw在测量子布局的时候会用        }        setMeasuredDimension(wIDthSize, heightSize);    }    @OverrIDe    protected voID onDraw(Canvas canvas) {        super.onDraw(canvas);        /**         * 自定义view之绘图篇（四）：baseline和FontMetrics         * https://blog.csdn.net/u012551350/article/details/51361778         */        Paint.FontMetrics FontMetrics = mPaint.getFontMetrics();        //中心线到基线的距离        int dy = (int) ((FontMetrics.bottom - FontMetrics.top) / 2 - FontMetrics.bottom);        //得到基线（Baseline）        int baseline = getHeight() / 2 + dy;        int x = getpaddingleft();        canvas.drawText(mText, x, baseline, mPaint);    }}

 

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