自定义View 可清除内容、设置图标、下划线的输入框 MD

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自定义View 可清除内容、设置图标、下划线的输入框 MD

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目录

目录
案例
ClearEditText
下划线

案例

<com.bqt.lock.ClearEditText
    android:layout_width="match_parent"
    android:layout_height="50dp"
    android:background="@null"
    android:drawableBottom="@drawable/shape_line"
    android:drawableLeft="@drawable/icon"
    android:maxLines="2"
    android:textSize="14sp"/>
<com.bqt.lock.ClearEditText
    android:layout_width="match_parent"
    android:layout_height="30dp"
    android:layout_marginTop="10dp"
    android:background="#00f"
    android:drawableBottom="@drawable/shape_line"
    android:drawableLeft="@drawable/icon"
    android:drawablePadding="10dp"
    android:maxLength="10"
    android:maxLines="1"
    android:textSize="13sp"/>

ClearEditText

public class ClearEditText extends AppCompatEditText implements View.OnFocusChangeListener, TextWatcher {
    private Drawable leftIconDrawable;//左侧的一般为输入内容的指示图标
    private Drawable bottomLineDrawable;//右侧为清空内容的图标
    private Drawable rightClearDrawable;//下侧为下划线
    private int size;
    public ClearEditText(Context context) {
        this(context, null);
    }
    public ClearEditText(Context context, AttributeSet attrs) {
        this(context, attrs, android.R.attr.editTextStyle);
    }
    public ClearEditText(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        init(context);
    }
    private void init(Context context) {
        // 获取EditText的DrawableRight，假如没有设置我们就使用默认的图片
        rightClearDrawable = getCompoundDrawables()[2] == null ? getResources().getDrawable(R.drawable.icon_clean) : getCompoundDrawables()[2];
        leftIconDrawable = getCompoundDrawables()[0];
        bottomLineDrawable = getCompoundDrawables()[3];
        setOnFocusChangeListener(this);
        addTextChangedListener(this);
    }
    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        //如果设置了【drawableBottom】，则【drawableRight】的最大高度为【控件的高度 - drawableBottom的高度 - drawablePadding】
        int usedHeight = bottomLineDrawable != null ? bottomLineDrawable.getIntrinsicHeight() * 2 + getCompoundDrawablePadding() : 0;
        size = getMeasuredHeight() - usedHeight;
        Log.i("bqt", "【Drawable的宽高为】" + size);
        rightClearDrawable.setBounds(0, 0, size, size);
        if (leftIconDrawable != null) {
            leftIconDrawable.setBounds(0, 0, size, size);
        }
        setClearIconVisible(getText().length() > 0 && hasFocus());
    }
    /**
     * 因为我们不能直接给EditText设置点击事件，所以我们用记住我们按下的位置来模拟点击事件 当我们按下的位置 在 EditText的宽度 -
     * 图标到控件右边的间距 - 图标的宽度 和 EditText的宽度 - 图标到控件右边的间距之间我们就算点击了图标，竖直方向没有考虑
     */
    @Override
    public boolean onTouchEvent(MotionEvent event) {
        if (getCompoundDrawables()[2] != null
                && event.getAction() == MotionEvent.ACTION_UP
                && event.getX() >= (getWidth() - getPaddingRight() - size)
                && (event.getX() <= (getWidth() - getPaddingRight()))) {
            this.setText("");
        }
        return super.onTouchEvent(event);
    }
    /**
     * 当ClearEditText焦点发生变化的时候，判断里面字符串长度设置清除图标的显示与隐藏
     */
    @Override
    public void onFocusChange(View v, boolean hasFocus) {
        if (hasFocus) {
            setClearIconVisible(getText().length() > 0);
        } else {
            setClearIconVisible(false);
        }
    }
    /**
     * 设置清除图标的显示与隐藏，调用setCompoundDrawables为EditText绘制上去
     */
    protected void setClearIconVisible(boolean visible) {
        setCompoundDrawables(leftIconDrawable, getCompoundDrawables()[1], visible ? rightClearDrawable : null, bottomLineDrawable);
    }
    @Override
    public void onTextChanged(CharSequence s, int start, int count, int after) {
    }
    @Override
    public void beforeTextChanged(CharSequence s, int start, int count, int after) {
    }
    @Override
    public void afterTextChanged(Editable s) {
        setClearIconVisible(s.length() > 0 && hasFocus());
    }
}

下划线

这种方式比单独加一个控件显示分割线更优雅一些

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
    <solid android:color="#D4D4D4"/>
    <size
        android:width="1000dp"
        android:height="1dp"/>
</shape>

2018-10-13