一、需求问题
网上开源的是构建同等数量的EditText，这种存在很多缺陷，主要如下
1、数字/字符键盘切换后状态无法保存
2、焦点切换无法判断
3、光标位置无法修正
为了解决上述问题，使用TextView实现输入框，需要解决的问题是
1、允许TextView可编辑输入
2、修改onDraw实现
效果如下
二、使用TextView 实现输入框
public class EditTextView extends TextView implements TextWatcher {
private final int INPUT_BOX_NUM = 5;
private int mBoxSpace = 10;
public EditTextView(Context context) {
this(context,null);
}
public EditTextView(Context context, @Nullable AttributeSet attrs) {
this(context, attrs,0);
}
public EditTextView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
setFocusable(true);
setFocusableInTouchMode(true); //支持触摸聚焦
setClickable(true);
setGravity(Gravity.CENTER_VERTICAL);
setMaxLines(1);
setFilters(new InputFilter[]{
new InputFilter.LengthFilter(INPUT_BOX_NUM)
});
if(Build.VERSION.SDK_INT>=23) {
setBreakStrategy(Layout.BREAK_STRATEGY_SIMPLE);
}
mBoxSpace = (int) TypedValue.applyDimension(PLEX_UNIT_DIP,10,context.getResources().getDisplayMetrics());
addTextChangedListener(this);
}
@Override
protected boolean getDefaultEditable() {
return true;
}
@Override
protected void onDraw(Canvas canvas) {
// super.onDraw(canvas);
TextPaint paint = getPaint();
int strokeWidth = (int) paint.getStrokeWidth();
int boxWidth = (getWidth()- strokeWidth*2 - (INPUT_BOX_NUM-1)*mBoxSpace)/INPUT_BOX_NUM;
int boxHeight = getHeight() - strokeWidth*2;
RectF rectF = null;
Paint.Style style = paint.getStyle();
Paint.Align align = paint.getTextAlign();
paint.setTextAlign(Paint.Align.CENTER);
paint.setStyle(Paint.Style.STROKE);
paint.setTextAlign(Paint.Align.CENTER);
String text = getText().toString();
for (int i=0;i
rectF = new RectF(
i*(boxWidth+mBoxSpace),
0,
i*(boxWidth+mBoxSpace)+boxWidth,
boxHeight
);
Paint.FontMetrics fontMetrics = paint.getFontMetrics();
float top = fontMetrics.top;//为基线到字体上边框的距离,即上图中的top
float bottom = fontMetrics.bottom;//为基线到字体下边框的距离,即上图中的bottom
int baseLineY = (int) (rectF.centerY() - top/2 - bottom/2);//基线中间点的y轴计算公式
canvas.drawRoundRect(rectF,0,0,paint);
if(text.length()>i) {
String CH = String.valueOf(text.charAt(i));
canvas.drawText(CH,rectF.centerX(),baseLineY,paint);
}
}
paint.setStyle(style);
paint.setTextAlign(align);
}
/**
* 控制是否返回完整文本
* @return
*/
@Override
public boolean getFreezesText() {
return true;
}
@Override
public Editable getText() {
return (Editable) super.getText();
}
@Override
public void setText(CharSequence text, BufferType type) {
super.setText(text, BufferType.EDITABLE);
}
/**
* 控制光标展示
* @return
*/
@Override
protected MovementMethod getDefaultMovementMethod() {
return ArrowKeyMovementMethod.getInstance();
}
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
}
@Override
public void afterTextChanged(Editable s) {
}
}
