真正改变字间距的方法

来源：互联网发布：双色球算法编辑：程序博客网时间：2024/05/16 08:02

Android本身没提供真正改变字间距的方法

直接上代码

    public class MyTextView extends TextView {    private String content;    private int width;    private Paint paint;    private int textHeight;    private int yPadding;    int count;    //记录每个字的二维数组    int[][] position;    private int color;    private int size;    private String s;    private boolean mInitialized = false;    public MyTextView(Context context) {        this(context, null);    }    public MyTextView(Context context, AttributeSet attrs) {        this(context, attrs, 0);    }    public MyTextView(Context context, AttributeSet attrs, int defStyle) {        super(context, attrs, defStyle);        TypedArray array = context.getTheme().obtainStyledAttributes(attrs, R.styleable.CustomTextView, defStyle, 0);        int n = array.getIndexCount();        for (int i=0; i<n; i++){            int attr = array.getIndex(i);            switch (attr){                case R.styleable.CustomTextView_textColor:                    color = array.getColor(attr, Color.BLUE);                    break;                case R.styleable.CustomTextView_textSize:                    size = array.getDimensionPixelSize(attr, (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_PX, 20, getResources().getDisplayMetrics()));                    break;                case R.styleable.CustomTextView_text:                    s = array.getString(attr);                    break;            }        }        array.recycle();        paint = new Paint();        paint.setColor(color);        paint.setTypeface(Typeface.DEFAULT);        paint.setTextSize(size);        Paint.FontMetrics fm = paint.getFontMetrics();// 得到系统默认字体属性        textHeight = (int) (Math.ceil(fm.descent - fm.ascent - size/4));// 获得字体高度        yPadding = Utils.dipToPx(this.getContext(), 10f);        getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {            @TargetApi(Build.VERSION_CODES.JELLY_BEAN)            @Override            public void onGlobalLayout() {                if (!mInitialized) {                    mInitialized = true;                    getViewTreeObserver().removeOnGlobalLayoutListener(this);                    width = getMeasuredWidth();                    setText(s);                }            }        });    }    public void setText(String str) {        if (str == null)            str = "";        if (!mInitialized) {            ViewGroup.LayoutParams params = getLayoutParams();            width = params.width;            mInitialized = true;        }        setPosition(str);        //重新画控件        this.invalidate();    }    @Override    protected void onDraw(Canvas canvas) {        super.onDraw(canvas);        if (!TextUtils.isEmpty(content)) {            for (int i = 0; i < count; i++) {                canvas.drawText(String.valueOf(content.charAt(i)), position[i][0], position[i][1], paint);            }        }    }    public void setPosition(String content){        this.content = content;        count = content.length();        int x = 0;        char ch;        position = new int[count][2];        float textWith = 0f;        for (int i=0; i<count; i++){            ch = content.charAt(i);            String str = String.valueOf(ch);            Rect rect = new Rect();            paint.getTextBounds(str, 0, 1, rect);            int strwidth = rect.width();            textWith = Math.max(strwidth, textWith);        }        for (int i=0; i<count; i++){            if (i != 0){                x += (width - count * textWith)/(count - 1);            }            position[i][0] = x;            position[i][1] = textHeight;            x += textWith;            this.setHeight(textHeight + yPadding);        }    }}

    <declare-styleable name="CustomTextView">        <attr name="textColor" format="color" />        <attr name="textSize" format="dimension" />        <attr name="text" format="string" />    </declare-styleable>

使用例子

    <?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"    android:orientation="vertical" android:layout_width="match_parent"    android:layout_height="match_parent">    <com.gzfgeh.CustomTextView.MyTextView        android:layout_width="100dp"        android:layout_height="wrap_content"        android:id="@+id/text1"        app:textSize="20px"        app:textColor="@android:color/black"/>    <com.gzfgeh.CustomTextView.MyTextView        android:layout_width="100dp"        android:layout_height="wrap_content"        android:id="@+id/text2"        app:textSize="30px"        app:textColor="@android:color/holo_blue_bright"/>    <com.gzfgeh.CustomTextView.MyTextView        android:layout_width="100dp"        android:layout_height="wrap_content"        android:id="@+id/text3"        app:textSize="30px"        app:textColor="@android:color/holo_blue_bright"        app:text="我非常好"/>    <RelativeLayout        android:layout_width="wrap_content"        android:layout_height="wrap_content">        <com.gzfgeh.CustomTextView.MyTextView            android:layout_width="100dp"            android:layout_height="wrap_content"            android:id="@+id/text4"            app:textSize="30px"            app:textColor="@android:color/holo_blue_bright"            app:text="我非常好"/>        <TextView            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:layout_alignBaseline="@+id/text4"            android:text="123456"            android:textSize="36px"            android:layout_toRightOf="@+id/text4"/>    </RelativeLayout></LinearLayout>

效果图

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