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自定义全键盘-[Android_YangKe]

2017-05-03  本文已影响1525人  Android_YangKe

尊重劳动者创作，转发请注明出处

首先看本文实现的效果。

yangke.gif

学而不思则罔，思而不学则殆。一眨眼五一小长假就结束了，完全没玩嗨呢，不能完全进入工作状态，小伙伴们扶我起来嗨。一年嗨两次，一次嗨半年。好了，言归正传，今天是一个自定义键盘。

首先了解 API

KeyboardView

KeyboardView 一个用于呈现虚拟键盘的 view，同时处理着每一个键盘所对应的点击、触摸等事件。

常用属性：

| XML attributes|
| :-------------:| :-------------:|
| android:keyBackground| Image for the key. |
| android:keyPreviewLayout| Layout resource for key press feedback. |
|android:keyPreviewOffset | Vertical offset of the key press feedback from the key. |
| android:keyTextColor| Color to use for the label in a key. |
| android:keyTextSize| Size of the text for character keys. |
| android:labelTextSize| Size of the text for custom keys with some text and no icon. |
| android:popupLayout| Layout resource for popup keyboards. |
|android:verticalCorrection| Amount to offset the touch Y coordinate by, for bias correction. |

顾名思义这些 API 很简单，这里不做过多的解释。在使用时我们需要特别注意下 android:verticalCorrection 。由于 android 设备众多，键盘 y 轴触摸区域可能存在偏差，此 API 是用于矫正偏移的 Y 坐标。具体作用自己可以在 xml 手动更改进行感受。

Keyboard

Keyboard 的样式是以 XML 文件的形式存在的，由多个 Row 和 Key 组成，我们可以直接在 XML 定义键盘的行、键、以及键大小，下面看代码块。

 <Keyboard
     android:keyWidth="%10p"
     android:keyHeight="50px"
     android:horizontalGap="2px"
     android:verticalGap="2px" >
 <Row android:keyWidth="32px" >
     <Key android:keyLabel="A" />
     ...
 </Row>
 ...
 </Keyboard>

其中 Keyboard 表示整个键盘， Row 表示其中一行，Key 表示某一个具体按键。也就是说键盘的大小，样式都可以在这个文件中进行定义，下面通过一个表格对 Keyboard 必要属性进行简单了解。

|XML attributes|
| :-------------:| :-------------:|
|android:horizontalGap| Default horizontal gap between keys. |
|android:keyHeight|Default height of a key, in pixels or percentage of display width. |
|android:keyWidth|Default width of a key, in pixels or percentage of display width. |
|android:verticalGap|Default vertical gap between rows of keys. |

OK，到这里自定义键盘所需要了解的知识已经足够了，下面进入编码模式。

public class KeyboardViewS implements OnKeyboardActionListener {

private static final int KEYBOARD_DURATION = 350;
private EditText mEditText;
private Keyboard mKeyboard;
/** 是否大写 */
private boolean isUperCase = false;
private android.inputmethodservice.KeyboardView keyboardView;

public KeyboardViewS(Activity act, EditText edit) {
    this.mEditText = edit;
    mKeyboard = new Keyboard(act, R.xml.qwerty);

    keyboardView = (android.inputmethodservice.KeyboardView) (act.findViewById(R.id.keyboard_view));
    keyboardView.setKeyboard(mKeyboard);
    /** 设置没有弹窗的提示 */
    keyboardView.setPreviewEnabled(false);
    keyboardView.setOnKeyboardActionListener(this);
    uperCase();
}

@Override
public void onKey(int primaryCode, int[] keyCodes) {
    Editable editable = mEditText.getText();
    int start = mEditText.getSelectionStart();
    if (primaryCode == Keyboard.KEYCODE_CANCEL) {       // 完成
        hideKeyboard(keyboardView);
    } else if (primaryCode == Keyboard.KEYCODE_DELETE) {// 回退
        if (editable != null && editable.length() > 0) {
            if (start > 0) {
                editable.delete(start - 1, start);
            }
        }
    } else if (primaryCode == Keyboard.KEYCODE_SHIFT) {// 大小写切换
        uperCase();
        keyboardView.setKeyboard(mKeyboard);
    } else if (primaryCode == 57419) {
        if (start > 0) {
            mEditText.setSelection(start - 1);
        }
    } else if (primaryCode == 57421) {
        if (start < mEditText.length()) {
            mEditText.setSelection(start + 1);
        }
    } else {
        editable.insert(start, Character.toString((char) primaryCode));
    }
}

/** 键盘大小写切换 */
private void uperCase() {
    final List<Key> keylist = mKeyboard.getKeys();
    if (isUperCase) {
        isUperCase = false;
        for (Key key : keylist) {
            if (key.label != null && isword(key.label.toString())) {
                key.label = key.label.toString().toLowerCase();
                key.codes[0] = key.codes[0] + 32;
            }
        }
    } else {
        isUperCase = true;
        for (Key key : keylist) {
            if (key.label != null && isword(key.label.toString())) {
                key.label = key.label.toString().toUpperCase();
                key.codes[0] = key.codes[0] - 32;
            }
        }
    }
}

/** 隐藏输入法，显示光标 */
public static  void setSystemInputGone(EditText editText) {
    if (Build.VERSION.SDK_INT >= 11) {
        Class<EditText> cls = EditText.class;
        try {
            Method setShowSoftInputOnFocus = cls.getMethod("setShowSoftInputOnFocus", boolean.class);
            setShowSoftInputOnFocus.setAccessible(false);
            setShowSoftInputOnFocus.invoke(editText, false);
        } catch (Exception e) {
            e.printStackTrace();
        }
    } else {
        editText.setInputType(android.text.InputType.TYPE_NULL);
        editText.setInputType(editText.getInputType());
    }
}

/** 显示键盘 */
public void showKeyboard() {
    int visibility = keyboardView.getVisibility();
    if (visibility == View.GONE || visibility == View.INVISIBLE) {
        Animation anim = AnimationUtils.translateAnimationOut(KEYBOARD_DURATION);
        keyboardView.setVisibility(View.VISIBLE);
        keyboardView.startAnimation(anim);
        anim.setAnimationListener(new AnimationListener() {
            @Override
            public void onAnimationEnd(Animation animation) {
                super.onAnimationEnd(animation);
                keyboardView.clearAnimation();
            }
        });
    }
}

/** 隐藏键盘 */
public static void hideKeyboard(final KeyboardView keyboardView) {
    if (keyboardView == null) {
        return;
    }
    if (keyboardView.getVisibility() == View.VISIBLE) {
        Animation anim = AnimationUtils.translateAnimationIn(KEYBOARD_DURATION);
        keyboardView.startAnimation(anim);
        anim.setAnimationListener(new AnimationListener() {
            @Override
            public void onAnimationEnd(Animation animation) {
                super.onAnimationEnd(animation);
                keyboardView.clearAnimation();
            }
        });
        keyboardView.setVisibility(View.GONE);
    }
}

private boolean isword(String str) {
    final String wordstr = "abcdefghijklmnopqrstuvwxyz";
    if (wordstr.indexOf(str.toLowerCase()) > -1) {
        return true;
    }
    return false;
}
...
}

核心代码。尊重劳动者成功，转发请注明出处。

<?xml version="1.0" encoding="UTF-8"?>
<Keyboard android:keyWidth="8.4%" android:keyHeight="7%"
android:horizontalGap="5dp" android:verticalGap="3dp"
xmlns:android="http://schemas.android.com/apk/res/android">

<Row>
    <Key android:codes="49" android:keyLabel="1" />
    <Key android:codes="50" android:keyLabel="2" />
    <Key android:codes="51" android:keyLabel="3" />
    <Key android:codes="52" android:keyLabel="4" />
    <Key android:codes="53" android:keyLabel="5" />
    <Key android:codes="54" android:keyLabel="6" />
    <Key android:codes="55" android:keyLabel="7" />
    <Key android:codes="56" android:keyLabel="8" />
    <Key android:codes="57" android:keyLabel="9" />
    <Key android:codes="48" android:keyEdgeFlags="right" android:keyLabel="0" />
</Row>

<Row>
    <Key android:codes="113" android:keyEdgeFlags="left" android:keyLabel="q" />
    <Key android:codes="119" android:keyLabel="w" />
    <Key android:codes="101" android:keyLabel="e" />
    <Key android:codes="114" android:keyLabel="r" />
    <Key android:codes="116" android:keyLabel="t" />
    <Key android:codes="121" android:keyLabel="y" />
    <Key android:codes="117" android:keyLabel="u" />
    <Key android:codes="105" android:keyLabel="i" />
    <Key android:codes="111" android:keyLabel="o" />
    <Key android:codes="112" android:keyEdgeFlags="right" android:keyLabel="p" />
</Row>

<Row>
    <Key android:horizontalGap="6%p" android:codes="97" android:keyEdgeFlags="left" android:keyLabel="a" />
    <Key android:codes="115" android:keyLabel="s" />
    <Key android:codes="100" android:keyLabel="d" />
    <Key android:codes="102" android:keyLabel="f" />
    <Key android:codes="103" android:keyLabel="g" />
    <Key android:codes="104" android:keyLabel="h" />
    <Key android:codes="106" android:keyLabel="j" />
    <Key android:codes="107" android:keyLabel="k" />
    <Key android:codes="108" android:keyEdgeFlags="right" android:keyLabel="l" />
</Row>

<Row>
    <Key android:keyWidth="13%p" android:codes="-1" android:keyEdgeFlags="left" android:isModifier="true" android:isSticky="true" android:keyIcon="@drawable/shift" />
    <Key android:codes="122" android:keyLabel="z"/>
    <Key android:codes="120" android:keyLabel="x"/>
    <Key android:codes="99" android:keyLabel="c" />
    <Key android:codes="118" android:keyLabel="v"/>
    <Key android:codes="98" android:keyLabel="b" />
    <Key android:codes="110" android:keyLabel="n"/>
    <Key android:codes="109" android:keyLabel="m"/>
    <Key android:keyWidth="13.3%p" android:codes="-5" android:keyEdgeFlags="right" android:isRepeatable="true" android:keyIcon="@drawable/keyboard_delete" />
</Row>

<Row android:rowEdgeFlags="bottom">
    <Key android:keyWidth="15%p" android:codes="-6" android:keyLabel="复制"/>
    <Key android:keyWidth="15%p" android:codes="-6" android:keyLabel="粘贴"/>
    <Key android:keyWidth="44%p" android:codes="32" android:isRepeatable="true" android:keyLabel="~~ 杨柯 ~~" />
    <Key android:keyWidth="17.5%p" android:codes="-3" android:keyEdgeFlags="right" android:keyLabel="完成" />
</Row>

</Keyboard>

再坚持一下，再努力一下，再前进一下，也许，成功离你只有一步之遥。有句话说，哪怕只有百分之一的希望，我也要付出百分之百的努力。学习不能停！！

** ps: 有帮助的话: 喜欢、评论、转发，动一动你的小手让更多的人知道！关注 帅比-杨**

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