Android控件之——TextView

1.设置行间距

android:lineSpacingMultiplier="1.8"

2.字间距设置(需要自定义控件)

import android.graphics.*;

import android.text.TextUtils;

import android.util.AttributeSet;

import android.widget.TextView;

import java.util.regex.Matcher;
import java.util.regex.Pattern;


/**
 * Created by mrni-mac on 14-11-25.
 */
public class MyTextView extends TextView {
    private String content;
    private int width;
    private Paint paint;
    private int xPadding;
    private int yPadding;
    private int textHeight;
    private int xPaddingMin;
    int count;

    int[][] position;

    public MyTextView(Context context) {
        super(context);
        init();
    }

    public MyTextView(Context context, AttributeSet attrs) {
        super(context, attrs);
        init();
    }

    public MyTextView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        init();
    }

    public void setText(String str) {
        width = this.getWidth();
        getPositions(str);
        this.invalidate();
    }

    public void init() {
        paint = new Paint();
        paint.setColor(Color.parseColor("#888888"));
        paint.setTypeface(Typeface.DEFAULT);
        paint.setTextSize(dip2px(this.getContext(), 14f));

        Paint.FontMetrics fm = paint.getFontMetrics(); // 
        textHeight = (int) (Math.ceil(fm.descent - fm.top) + 2); // 

        xPadding = dip2px(this.getContext(), 4f);
        yPadding = dip2px(this.getContext(), 10f);
        xPaddingMin = dip2px(this.getContext(), 2f);
    }

    @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 getPositions(String content) {
        this.content = content;

        char ch;

        int x = 0;

        int lineNum = 1;
        count = content.length();
        position = new int[count][2];

        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();

            if (str.equals("?") || str.equals("?")) {
                strwidth += (xPaddingMin * 2);
            }

            float textWith = strwidth;
            x += textWith;

            if (x > width) {
                lineNum++; // 
                x = 0;
            } else {
                x -= textWith;
            }

            position[i][0] = x;
            position[i][1] = (textHeight * lineNum) +
                (yPadding * (lineNum - 1));


            if (isNumOrLetters(str)) {
                x += (textWith + xPaddingMin);
            } else {
                x += (textWith + xPadding);
            }
        }

        this.setHeight((textHeight + yPadding) * lineNum);
    }

    public boolean isNumOrLetters(String str) {
        String regEx = "^[A-Za-z0-9_]+$";
        Pattern p = Pattern.compile(regEx);
        Matcher m = p.matcher(str);

        return m.matches();
    }

    public static int dip2px(Context context, float dip) {
        final float scale = context.getResources().getDisplayMetrics().density;

        return (int) ((dip * scale) + 0.5f);
    }
}

3.字水平方向缩放

android:textScaleX="1.5"

4.内容省略

android:ellipsize="end"　　 省略号在结尾
android:ellipsize="start" 　　省略号在开头
android:ellipsize="middle" 省略号在中间

5.内容滚动展示(跑马灯)

android:ellipsize="marquee" 跑马灯

6.内容的收起及展开功能

//默认展示三行
android:lines="3"
//结尾显示省略号
android:ellipsize="end"
//以上两属性为内容的收起效果
//代码实现
TextView.setLines(3);
TextView.setEllipsize(TextUtils.TruncateAt.END);

//内容展开
//消除省略号
TextView.setEllipsize(null);
//消除lines=="3"这个固定值
TextView.setSingleLine(false);

7.设置小图标

xml设置

android:drawableLeft=""
android:drawableTop=""
android:drawableRight="@mipmap/jiaotou_xuanzexiangmu_xia"
android:drawableBottom=""

代码动态设置

Drawable drawableRightUP = getResources().getDrawable(R.mipmap.jiaotou_xuanzexiangmu_shang);
//left小图标放在左边
//top小图标放在上面
//right小图标放在右边
//bottom小图标放在下面
textView.setCompoundDrawablesWithIntrinsicBounds(null, null, drawableRightUP, null);

参考文章