前言

不啰嗦

正文

對于自定義鍵盤扎拣，官方提供了兩個玩意（再簡單的鍵盤也都要用到）：Keyboard和KeyboardView赴肚，當然，為了方便我們會定義一個util：KeyboardUtil

Keyboard

Loads an XML description of a keyboard and stores the attributes of the keys. A keyboard consists of rows of keys.

加載鍵盤的XML描述并存儲鍵的屬性二蓝。鍵盤由一行鍵組成誉券。（還有翻譯，我真貼心）
keyboard是一個xml文件刊愚，下面有個例子：

<?xml version="1.0" encoding="utf-8"?>
<Keyboard xmlns:android="http://schemas.android.com/apk/res/android"
          android:keyWidth="33%p"
          android:horizontalGap="1dp"
          android:verticalGap="1dp"
          android:keyHeight="54dp">
    <Row>
        <Key android:codes="49" android:keyLabel="1" android:keyEdgeFlags="left"/>
        <Key android:codes="50" android:keyLabel="2" />
        <Key android:codes="51" android:keyLabel="3" />

    </Row>

    <Row>
        <Key android:codes="52" android:keyLabel="4" android:keyEdgeFlags="left" />
        <Key android:codes="53" android:keyLabel="5" />
        <Key android:codes="54" android:keyLabel="6" />

    </Row>

    <Row>
        <Key android:codes="55" android:keyLabel="7" android:keyEdgeFlags="left"/>
        <Key android:codes="56" android:keyLabel="8" />
        <Key android:codes="57" android:keyLabel="9" />
    </Row>

    <Row>
        <Key android:codes="46" android:keyLabel="." android:keyEdgeFlags="left" />
        <Key android:codes="48" android:keyLabel="0" />
        <Key android:codes="-5" android:isRepeatable="true"
            android:keyIcon="@drawable/delete_tzjesr"/>
    </Row>
</Keyboard>

具體描述如下：

實例為三列四行標準格式疏日，接下來聊一聊標準：最標準的莫過于每個鍵同樣的高度同樣的寬度，當然這是很理想的一種形式撒汉。我們一般會得到UI強制規(guī)定的個性化鍵盤:

UI強制規(guī)定的個性化鍵盤

不同顏色的自定義鍵下面說別著急沟优，對于上面這樣的不規(guī)則鍵盤，因為只能一行一行放置鍵睬辐，

所以首先keyWidth我們設(shè)置為25%p我們一行最多要放四個鍵挠阁，一三行我們放四個鍵二四行放三個鍵，第一三行最后一個鍵高度為其他鍵高度的兩倍需要在<key />里面單獨寫keyHeight溯饵，同理如果鍵寬不一樣的話單獨設(shè)置即可侵俗。

KeyboardView

A view that renders a virtual Keyboard. It handles rendering of keys and detecting key presses and touch movements.
呈現(xiàn)虛擬鍵盤的視圖。它處理按鍵的渲染和檢測按鍵和觸摸動作丰刊。

這個東西就是寫在布局里的view了

示例如下：

<com.ql.jcjr.view.MyKeyboredView
        android:id="@+id/keyboard_view"
        android:layout_width="match_parent"
        android:layout_height="216dp"
        android:background="@color/divider_color"
        android:focusable="true"
        android:shadowRadius="0.0"
        android:shadowColor="@color/c_fffff"
        android:focusableInTouchMode="true"
        android:keyBackground="@drawable/keyboard_key"
        android:keyTextColor="@color/colorPrimaryDark"
        />

這是我重寫掉的隘谣，后面會講。

具體屬性如下：

android:shadowRadius="0.0" android:shadowColor="背景色"
這兩個屬性可以解決鍵盤上顯示的文字糊的問題熄求。

KeyboardUtil

public class KeyboardUtil {
    private View ll_jianpan;
    private KeyboardView mKeyboardView;
    private Keyboard mNumberKeyboard; // 數(shù)字鍵盤
    private Keyboard mLetterKeyboard; // 字母鍵盤
    private Context mContext;

    private boolean isNumber = false;  // 是否數(shù)字鍵盤
    private boolean isUpper = false;   // 是否大寫
    private EditText mEditText;

    /**
     *
     * @param context
     * @param view
     * @param editText
     * @param type  0,空白格 1，小數(shù)點  2逗概，身份證X
     */
    public KeyboardUtil(Context context, View view, EditText editText,int type) {
        mContext=context;
        mEditText = editText;
        mLetterKeyboard = new Keyboard(context, R.xml.keyboard_qwerty);
        mKeyboardView = (KeyboardView) view.findViewById(R.id.keyboard_view);
        ll_jianpan= view.findViewById(R.id.ll_jianpan);
        ImageView iv_close= (ImageView) ll_jianpan.findViewById(R.id.iv_close);
        iv_close.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                hideKeyboard();
            }
        });
        if (type==0){
            mNumberKeyboard = new Keyboard(context, R.xml.keyboard_numbers_blank);
        }else if (type==1){
            mNumberKeyboard = new Keyboard(context, R.xml.keyboard_numbers);
        }else if (type==2){
            mNumberKeyboard = new Keyboard(context, R.xml.keyboard_numbers_realname);
        }else if (type==66299){
            mNumberKeyboard = new Keyboard(context, R.xml.keyboard_numbers_blank);
            iv_close.setVisibility(View.GONE);
        }

        mKeyboardView.setKeyboard(mNumberKeyboard);
        mKeyboardView.setEnabled(true);
        mKeyboardView.setPreviewEnabled(false);
        mKeyboardView.setOnKeyboardActionListener(listener);

    }
    public KeyboardUtil(Context context, Activity activity, EditText editText, int type) {
        mContext=context;
        mEditText = editText;
        if (type==0){
            mNumberKeyboard = new Keyboard(context, R.xml.keyboard_numbers_blank);
        }else if (type==1){
            mNumberKeyboard = new Keyboard(context, R.xml.keyboard_numbers);
        }else if (type==2){
            mNumberKeyboard = new Keyboard(context, R.xml.keyboard_numbers_realname);
        }
        mLetterKeyboard = new Keyboard(context, R.xml.keyboard_qwerty);
        mKeyboardView = (KeyboardView) activity.findViewById(R.id.keyboard_view);
        ll_jianpan= activity.findViewById(R.id.ll_jianpan);
        mKeyboardView.setKeyboard(mNumberKeyboard);
        mKeyboardView.setEnabled(true);
        mKeyboardView.setPreviewEnabled(false);
        mKeyboardView.setOnKeyboardActionListener(listener);
        ImageView iv_close= (ImageView) ll_jianpan.findViewById(R.id.iv_close);
        iv_close.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                hideKeyboard();
            }
        });
    }


    private KeyboardView.OnKeyboardActionListener listener = new KeyboardView.OnKeyboardActionListener() {
        @Override
        public void onPress(int primaryCode) {

        }

        @Override
        public void onRelease(int primaryCode) {

        }

        @Override
        public void onKey(int primaryCode, int[] keyCodes) {
            Editable editable = mEditText.getText();
            int start = mEditText.getSelectionStart();
            if (primaryCode == Keyboard.KEYCODE_CANCEL||primaryCode == 66299) { // cancel
                hideKeyboard();
            } 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) { // 大小寫切換
                changeKeyboart();
                mKeyboardView.setKeyboard(mLetterKeyboard);

            } else if (primaryCode == Keyboard.KEYCODE_MODE_CHANGE) { // 數(shù)字與字母鍵盤互換
                if (isNumber) {
                    isNumber = false;
                    mKeyboardView.setKeyboard(mLetterKeyboard);
                } else {
                    isNumber = true;
                    mKeyboardView.setKeyboard(mNumberKeyboard);
                }

            } else if (primaryCode == 57419) { // 左移
                if (start > 0) {
                    mEditText.setSelection(start - 1);
                }

            } else if (primaryCode == 57419) { // 右移
                if (start > mEditText.length()) {
                    mEditText.setSelection(start + 1);
                }
            } else { // 輸入鍵盤值
                editable.insert(start, Character.toString((char) primaryCode));
            }
        }

        @Override
        public void onText(CharSequence text) {

        }

        @Override
        public void swipeLeft() {

        }

        @Override
        public void swipeRight() {

        }

        @Override
        public void swipeDown() {

        }

        @Override
        public void swipeUp() {

        }
    };

    private void changeKeyboart() {
        List<Keyboard.Key> keyList = mLetterKeyboard.getKeys();
        if (isUpper) { // 大寫切換小寫
            isUpper = false;
            for (Keyboard.Key key : keyList) {
                if (key.label != null && isLetter(key.label.toString())) {
                    key.label = key.label.toString().toLowerCase();
                    key.codes[0] = key.codes[0] + 32;
                }
            }
        } else { // 小寫切換成大寫
            isUpper = true;
            for (Keyboard.Key key : keyList) {
                if (key.label != null && isLetter(key.label.toString())) {
                    key.label = key.label.toString().toUpperCase();
                    key.codes[0] = key.codes[0] - 32;
                }
            }
        }
    }

    /**
     * 判斷是否是字母
     */
    private boolean isLetter(String str) {
        String wordStr = "abcdefghijklmnopqrstuvwxyz";
        return wordStr.contains(str.toLowerCase());
    }

    public void hideKeyboard() {

        int visibility = ll_jianpan.getVisibility();
        if (visibility == View.VISIBLE) {
            ll_jianpan.startAnimation(AnimationUtils.loadAnimation(mContext,R.anim.anim_bottom_out));
            ll_jianpan.setVisibility(View.GONE);
        }
    }

    public void showKeyboard() {
        int visibility = ll_jianpan.getVisibility();
        if (visibility == View.GONE || visibility == View.INVISIBLE) {
            ll_jianpan.startAnimation(AnimationUtils.loadAnimation(mContext,R.anim.anim_bottom_in));
            ll_jianpan.setVisibility(View.VISIBLE);
        }
    }
}

ll_jianpan其實就是一個包含keyboradview的線性布局
在這里比較重要的就是實現(xiàn)鍵盤的監(jiān)聽OnKeyboardActionListener

下面有一張對應(yīng)表code對應(yīng)ASCII值 然后輸出的就是控制字符 :

對應(yīng)表

當然我們肯定需要自定義一些功能弟晚，如關(guān)閉鍵盤切換數(shù)字字母鍵盤左移右移等，這些都放在了OnKeyboardActionListener的onKey中逾苫。其實就是根據(jù)不同的code處理不同的事件卿城，自定義code盡量個性點防止跟已占用code發(fā)生沖突。

既然是自定義鍵盤铅搓，我們當然要阻攔系統(tǒng)鍵盤瑟押，方法如下:

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
            editText.getCancelEditText().setShowSoftInputOnFocus(false);
 }else {
            editText.getCancelEditText().setInputType(InputType.TYPE_NULL);
  }

PS：setInputType(InputType.TYPE_NULL)會讓輸入框失去光標，但是沒辦法21以下的沒有setShowSoftInputOnFocus(false)這方法星掰。

至于打開鍵盤多望，可以在觸摸輸入框的時候觸發(fā)也可直接觸發(fā):

 editText.getCancelEditText().setOnTouchListener(new View.OnTouchListener() {
            @Override
            public boolean onTouch(View view, MotionEvent motionEvent) {
                new KeyboardUtil(mContext, Activity.this, editText,0).showKeyboard();
                return false;
            }
        });

最后嫩舟，重寫的Keyboradview:

public class MyKeyboredView extends KeyboardView {


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

    public MyKeyboredView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }

    @TargetApi(Build.VERSION_CODES.LOLLIPOP)
    public MyKeyboredView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
        super(context, attrs, defStyleAttr, defStyleRes);
    }

    @Override
    public void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        List<Keyboard.Key> keys = getKeyboard().getKeys();
        for (Keyboard.Key key : keys) {
            if (key.codes[0] == 66299) {
                Log.e("KEY", "Drawing key with code " + key.codes[0]);
                Drawable dr = (Drawable) JcbApplication.getInstance().getResources().getDrawable(R.drawable.jianpan_sure);
                dr.setBounds(key.x, key.y, key.x + key.width, key.y + key.height);
                dr.draw(canvas);
            } else {

            }
        }
    }
}

重寫onDraw（）根據(jù)code把點九圖充滿指定的鍵即可

后記

看到這你可能在找demo源碼，不好意思沒有的怀偷，如果你的時間確實很緊請移步家厌，如果你還有點時間，一天自己學完寫完沒什么問題的椎工，歡迎提出問題饭于，我們一起學習。