Android 自定义字母搜索表

来源：互联网发布：哪下载软件安全编辑：程序博客网时间：2024/05/17 08:00

这是我写的一个自定义VIew： 联系人字母搜索表

首先，设置atrss
设置的attr标签下可以设置选中或者未选中的字母表中字母的颜色，若为设置，在view类中有默认的颜色

<?xml version="1.0" encoding="utf-8"?><resources>    <declare-styleable name="LetterView">        <attr name="select_color" format="color"/>        <attr name="unselect" format="color"/>    </declare-styleable></resources>

接下来是自定义view类的实例代码

public class LetterView extends View{    private Paint paint;    private int count;    private int single;    private int chooseLetter;    private TextView bigLetter;    private int chooseColor;    private int defaultColor;    private static final String[] LETTERS = {"#", "A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L"                                    , "M", "N", "O", "P", "Q", "R", "S", "T",                                        "U", "V", "W", "X", "Y", "Z"};    public LetterView(Context context) {        this(context, null);    }    public LetterView(Context context, AttributeSet attrs) {        this(context, attrs, 0);    }    public LetterView(Context context, AttributeSet attrs, int defStyleAttr) {        super(context, attrs, defStyleAttr);        //获取自定义属性 1 AttributeSet属性的集合 2 自定义的属性 3默认的属性值 4默认的资源        TypedArray typedArray = context.getTheme().obtainStyledAttributes(attrs, R.styleable.LetterView, defStyleAttr, 0);        defaultColor = typedArray.getColor(R.styleable.LetterView_unselect, Color.BLACK);        chooseColor = typedArray.getColor(R.styleable.LetterView_select_color, Color.RED);        typedArray.recycle();        paint = new Paint();        paint.setColor(Color.BLACK);        paint.setTextSize(20);        chooseLetter = -1;    }    //获取导航显示大字母的View    public void setBigLetter(TextView bigLetter){        this.bigLetter = bigLetter;        bigLetter.setVisibility(GONE);    }    protected void onDraw(Canvas canvas) {        super.onDraw(canvas);        //获取View的高度和宽度        int height = getHeight();        int width = getWidth();        //计算一个字母的高度        count = LETTERS.length;        single = height/count;        for(int i = 0; i < count; i++){            //计算一个字母的宽度            int x = (int)(paint.measureText(LETTERS[i]));            if(i == chooseLetter){                paint.setColor(chooseColor);                paint.setTextSize(40);            } else {                paint.setColor(defaultColor);                paint.setTextSize(20);            }            canvas.drawText(LETTERS[i], width/2-x/2, (i+1) * single, paint);        }    }    @Override    public boolean dispatchTouchEvent(MotionEvent event) {        switch (event.getAction()){            case MotionEvent.ACTION_DOWN:            case MotionEvent.ACTION_MOVE:                //获取点击或触摸的位置的Y坐标                float y = event.getY();                int position = (int)(y / single);                if(position >= 0 && position < LETTERS.length){                    chooseLetter = position;                    bigLetter.setVisibility(VISIBLE);                    bigLetter.setText(LETTERS[chooseLetter]);                    invalidate();                }                break;            case MotionEvent.ACTION_UP:                chooseLetter = -1;                bigLetter.setVisibility(GONE);                invalidate();                break;        }        return true;    }}

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