最近在做物流的項目，需要輸入車牌號，傳統的輸入體驗并不好，來回切換還要手打，便有了自定義鍵盤的想法。
其實這個車牌需求并不多見，物流、租車、停車相關的會常見一些，好在有前輩已經鋪好路了
這個比較詳細：https://blog.csdn.net/dgs960825/article/details/50344743

1.在res文件夾下新建xml文件夾，新建兩個文件：number_or_letters.xml（數字和大寫字母）、province_abbreviation.xml（省會、直轄市、特別行政區簡稱）。

number_or_letters.xml

<?xml version="1.0" encoding="UTF-8"?> <Keyboard android:keyWidth="10%p" android:keyHeight="8%"android:horizontalGap="0.0px" android:verticalGap="0.0px"xmlns:android="http://schemas.android.com/apk/res/android"><Row android:verticalGap="1%p"><Key android:codes="49" android:keyLabel="1"android:horizontalGap="1%p" android:keyWidth="8%p"android:keyEdgeFlags="left" /><Key android:codes="50" android:keyLabel="2"android:horizontalGap="2%p" android:keyWidth="8%p" /><Key android:codes="51" android:keyLabel="3"android:horizontalGap="2%p" android:keyWidth="8%p" /><Key android:codes="52" android:keyLabel="4"android:horizontalGap="2%p" android:keyWidth="8%p" /><Key android:codes="53" android:keyLabel="5"android:horizontalGap="2%p" android:keyWidth="8%p" /><Key android:codes="54" android:keyLabel="6"android:horizontalGap="2%p" android:keyWidth="8%p" /><Key android:codes="55" android:keyLabel="7"android:horizontalGap="2%p" android:keyWidth="8%p" /><Key android:codes="56" android:keyLabel="8"android:horizontalGap="2%p" android:keyWidth="8%p" /><Key android:codes="57" android:keyLabel="9"android:horizontalGap="2%p" android:keyWidth="8%p" /><Key android:codes="48" android:keyLabel="0"android:horizontalGap="2%p" android:keyWidth="8%p"android:keyEdgeFlags="right"/></Row><Row android:verticalGap="1%p"><Key android:codes="81" android:keyLabel="Q"android:horizontalGap="1%p" android:keyWidth="8%p"android:keyEdgeFlags="left" /><Key android:codes="87" android:keyLabel="W"android:horizontalGap="2%p" android:keyWidth="8%p" /><Key android:codes="69" android:keyLabel="E"android:horizontalGap="2%p" android:keyWidth="8%p" /><Key android:codes="82" android:keyLabel="R"android:horizontalGap="2%p" android:keyWidth="8%p" /><Key android:codes="84" android:keyLabel="T"android:horizontalGap="2%p" android:keyWidth="8%p" /><Key android:codes="89" android:keyLabel="Y"android:horizontalGap="2%p" android:keyWidth="8%p" /><Key android:codes="85" android:keyLabel="U"android:horizontalGap="2%p" android:keyWidth="8%p" /><Key android:codes="73" android:keyLabel="I"android:horizontalGap="2%p" android:keyWidth="8%p" /><Key android:codes="79" android:keyLabel="O"android:horizontalGap="2%p" android:keyWidth="8%p" /><Key android:codes="80" android:keyLabel="P"android:horizontalGap="2%p" android:keyWidth="8%p"android:keyEdgeFlags="right" /></Row><Row android:verticalGap="1%p"><Key android:codes="65" android:keyLabel="A"android:horizontalGap="6%p" android:keyWidth="8%p"android:keyEdgeFlags="left"/><Key android:codes="83" android:keyLabel="S"android:horizontalGap="2%p" android:keyWidth="8%p" /><Key android:codes="68" android:keyLabel="D"android:horizontalGap="2%p" android:keyWidth="8%p" /><Key android:codes="70" android:keyLabel="F"android:horizontalGap="2%p" android:keyWidth="8%p" /><Key android:codes="71" android:keyLabel="G"android:horizontalGap="2%p" android:keyWidth="8%p" /><Key android:codes="72" android:keyLabel="H"android:horizontalGap="2%p" android:keyWidth="8%p" /><Key android:codes="74" android:keyLabel="J"android:horizontalGap="2%p" android:keyWidth="8%p" /><Key android:codes="75" android:keyLabel="K"android:horizontalGap="2%p" android:keyWidth="8%p" /><Key android:codes="76" android:keyLabel="L"android:horizontalGap="2%p" android:keyWidth="8%p"android:keyEdgeFlags="right" /></Row><Row ><Key android:codes="-1"android:keyEdgeFlags="left" android:keyLabel="省份"android:horizontalGap="1%p" android:keyWidth="13%p"android:isModifier="true" android:isSticky="true" /><Key android:codes="90" android:keyLabel="Z"android:horizontalGap="2%p" android:keyWidth="8%p"/><Key android:codes="88" android:keyLabel="X"android:horizontalGap="2%p" android:keyWidth="8%p" /><Key android:codes="67" android:keyLabel="C"android:horizontalGap="2%p" android:keyWidth="8%p" /><Key android:codes="86" android:keyLabel="V"android:horizontalGap="2%p" android:keyWidth="8%p" /><Key android:codes="66" android:keyLabel="B"android:horizontalGap="2%p" android:keyWidth="8%p" /><Key android:codes="78" android:keyLabel="N"android:horizontalGap="2%p" android:keyWidth="8%p"/><Key android:codes="77" android:keyLabel="M"android:horizontalGap="2%p" android:keyWidth="8%p"/><Key android:codes="-3"android:keyEdgeFlags="right" android:keyLabel="刪除"android:horizontalGap="2%p" android:keyWidth="13%p"android:isRepeatable="false" /></Row></Keyboard>

province_abbreviation.xml

<?xml version="1.0" encoding="UTF-8"?> <Keyboard android:keyWidth="10%p" android:keyHeight="8%p"android:horizontalGap="0.0px" android:verticalGap="0.0px"xmlns:android="http://schemas.android.com/apk/res/android"><Row android:verticalGap="1%p"><Key android:codes="20140" android:keyLabel="京"android:horizontalGap="1%p" android:keyWidth="8%p"android:keyEdgeFlags="left" /><Key android:codes="27941" android:keyLabel="津"android:horizontalGap="2%p" android:keyWidth="8%p" /><Key android:codes="20864" android:keyLabel="冀"android:horizontalGap="2%p" android:keyWidth="8%p" /><Key android:codes="40065" android:keyLabel="魯"android:horizontalGap="2%p" android:keyWidth="8%p" /><Key android:codes="26187" android:keyLabel="晉"android:horizontalGap="2%p" android:keyWidth="8%p" /><Key android:codes="33945" android:keyLabel="蒙"android:horizontalGap="2%p" android:keyWidth="8%p" /><Key android:codes="36797" android:keyLabel="遼"android:horizontalGap="2%p" android:keyWidth="8%p" /><Key android:codes="21513" android:keyLabel="吉"android:horizontalGap="2%p" android:keyWidth="8%p" /><Key android:codes="40657" android:keyLabel="黑"android:horizontalGap="2%p" android:keyWidth="8%p" /><Key android:codes="27818" android:keyLabel="滬"android:horizontalGap="2%p" android:keyWidth="8%p"android:keyEdgeFlags="right"/></Row><Row android:verticalGap="1%p"><Key android:codes="33487" android:keyLabel="蘇"android:horizontalGap="1%p" android:keyWidth="8%p"android:keyEdgeFlags="left" /><Key android:codes="27993" android:keyLabel="浙"android:horizontalGap="2%p" android:keyWidth="8%p" /><Key android:codes="30358" android:keyLabel="皖"android:horizontalGap="2%p" android:keyWidth="8%p" /><Key android:codes="38397" android:keyLabel="閩"android:horizontalGap="2%p" android:keyWidth="8%p" /><Key android:codes="36195" android:keyLabel="贛"android:horizontalGap="2%p" android:keyWidth="8%p" /><Key android:codes="35947" android:keyLabel="豫"android:horizontalGap="2%p" android:keyWidth="8%p" /><Key android:codes="37122" android:keyLabel="鄂"android:horizontalGap="2%p" android:keyWidth="8%p" /><Key android:codes="28248" android:keyLabel="湘"android:horizontalGap="2%p" android:keyWidth="8%p" /><Key android:codes="31908" android:keyLabel="粵"android:horizontalGap="2%p" android:keyWidth="8%p" /><Key android:codes="26690" android:keyLabel="桂"android:horizontalGap="2%p" android:keyWidth="8%p"android:keyEdgeFlags="right" /></Row><Row android:verticalGap="1%p"><Key android:codes="28189" android:keyLabel="渝"android:horizontalGap="11%p" android:keyWidth="8%p"android:keyEdgeFlags="left"/><Key android:codes="24029" android:keyLabel="川"android:horizontalGap="2%p" android:keyWidth="8%p" /><Key android:codes="36149" android:keyLabel="貴"android:horizontalGap="2%p" android:keyWidth="8%p" /><Key android:codes="20113" android:keyLabel="云"android:horizontalGap="2%p" android:keyWidth="8%p" /><Key android:codes="34255" android:keyLabel="藏"android:horizontalGap="2%p" android:keyWidth="8%p" /><Key android:codes="38485" android:keyLabel="陜"android:horizontalGap="2%p" android:keyWidth="8%p" /><Key android:codes="29976" android:keyLabel="甘"android:horizontalGap="2%p" android:keyWidth="8%p" /><Key android:codes="38738" android:keyLabel="青"android:horizontalGap="2%p" android:keyWidth="8%p"android:keyEdgeFlags="right" /></Row><Row ><Key android:codes="-1"android:keyEdgeFlags="left" android:keyLabel="ABC"android:horizontalGap="4%p" android:keyWidth="15%p"android:isModifier="true" android:isSticky="true" /><Key android:codes="29756" android:keyLabel="瓊"android:horizontalGap="2%p" android:keyWidth="8%p"/><Key android:codes="26032" android:keyLabel="新"android:horizontalGap="2%p" android:keyWidth="8%p" /><Key android:codes="23425" android:keyLabel="寧"android:horizontalGap="2%p" android:keyWidth="8%p" /><Key android:codes="28207" android:keyLabel="港"android:horizontalGap="2%p" android:keyWidth="8%p" /><Key android:codes="28595" android:keyLabel="澳"android:horizontalGap="2%p" android:keyWidth="8%p" /><Key android:codes="21488" android:keyLabel="臺"android:horizontalGap="2%p" android:keyWidth="8%p"/><Key android:codes="-3"android:keyEdgeFlags="right" android:keyLabel="刪除"android:horizontalGap="2%p" android:keyWidth="15%p"android:isRepeatable="false" /></Row></Keyboard>

2.新建鍵盤工具類KeyboardUtil（初始化、交互、顯示和隱藏）

package yechaoa.com.platenumberkeyboard;import android.app.Activity; import android.content.Context; import android.inputmethodservice.Keyboard; import android.inputmethodservice.KeyboardView; import android.text.Editable; import android.text.InputType; import android.view.View; import android.view.WindowManager; import android.widget.EditText;import java.lang.reflect.InvocationTargetException; import java.lang.reflect.Method;/*** Created by yechao on 2018/5/15/015.* Describe :*/ public class KeyboardUtil {private Activity mActivity;private KeyboardView mKeyboardView;private EditText mEdit;/*** 省份簡稱鍵盤*/private Keyboard provinceKeyboard;/*** 數字與大寫字母鍵盤*/private Keyboard numberKeyboard;KeyboardUtil(Activity activity, EditText edit) {mActivity = activity;mEdit = edit;provinceKeyboard = new Keyboard(activity, R.xml.province_abbreviation);numberKeyboard = new Keyboard(activity, R.xml.number_or_letters);mKeyboardView = (KeyboardView) activity.findViewById(R.id.keyboard_view);mKeyboardView.setKeyboard(provinceKeyboard);mKeyboardView.setEnabled(true);mKeyboardView.setPreviewEnabled(false);mKeyboardView.setOnKeyboardActionListener(listener);}private KeyboardView.OnKeyboardActionListener listener = new KeyboardView.OnKeyboardActionListener() {@Overridepublic void swipeUp() {}@Overridepublic void swipeRight() {}@Overridepublic void swipeLeft() {}@Overridepublic void swipeDown() {}@Overridepublic void onText(CharSequence text) {}@Overridepublic void onRelease(int primaryCode) {}@Overridepublic void onPress(int primaryCode) {}@Overridepublic void onKey(int primaryCode, int[] keyCodes) {Editable editable = mEdit.getText();int start = mEdit.getSelectionStart();//判定是否是中文的正則表達式 [\\u4e00-\\u9fa5]判斷一個中文 [\\u4e00-\\u9fa5]+多個中文String reg = "[\\u4e00-\\u9fa5]";if (primaryCode == -1) {// 省份簡稱與數字鍵盤切換if (mEdit.getText().toString().matches(reg)) {changeKeyboard(true);}} else if (primaryCode == -3) {if (editable != null && editable.length() > 0) {//沒有輸入內容時軟鍵盤重置為省份簡稱軟鍵盤if (editable.length() == 1) {changeKeyboard(false);}if (start > 0) {editable.delete(start - 1, start);}}} else {editable.insert(start, Character.toString((char) primaryCode));// 判斷第一個字符是否是中文,是，則自動切換到數字軟鍵盤if (mEdit.getText().toString().matches(reg)) {changeKeyboard(true);}}}};/*** 指定切換軟鍵盤 isNumber false表示要切換為省份簡稱軟鍵盤 true表示要切換為數字軟鍵盤*/private void changeKeyboard(boolean isNumber) {if (isNumber) {mKeyboardView.setKeyboard(numberKeyboard);} else {mKeyboardView.setKeyboard(provinceKeyboard);}}/*** 軟鍵盤展示狀態*/public boolean isShow() {return mKeyboardView.getVisibility() == View.VISIBLE;}/*** 軟鍵盤展示*/public void showKeyboard() {int visibility = mKeyboardView.getVisibility();if (visibility == View.GONE || visibility == View.INVISIBLE) {mKeyboardView.setVisibility(View.VISIBLE);}}/*** 軟鍵盤隱藏*/public void hideKeyboard() {int visibility = mKeyboardView.getVisibility();if (visibility == View.VISIBLE) {mKeyboardView.setVisibility(View.INVISIBLE);}}/*** 禁掉系統軟鍵盤*/public void hideSoftInputMethod() {mActivity.getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_HIDDEN);int currentVersion = android.os.Build.VERSION.SDK_INT;String methodName = null;if (currentVersion >= 16) {// 4.2methodName = "setShowSoftInputOnFocus";} else if (currentVersion >= 14) {// 4.0methodName = "setSoftInputShownOnFocus";}if (methodName == null) {mEdit.setInputType(InputType.TYPE_NULL);} else {Class<EditText> cls = EditText.class;Method setShowSoftInputOnFocus;try {setShowSoftInputOnFocus = cls.getMethod(methodName, boolean.class);setShowSoftInputOnFocus.setAccessible(true);setShowSoftInputOnFocus.invoke(mEdit, false);} catch (NoSuchMethodException e) {mEdit.setInputType(InputType.TYPE_NULL);e.printStackTrace();} catch (IllegalAccessException e) {e.printStackTrace();} catch (IllegalArgumentException e) {e.printStackTrace();} catch (InvocationTargetException e) {e.printStackTrace();}}}}

3.Activity引用

package yechaoa.com.platenumberkeyboard;import android.annotation.SuppressLint; import android.os.Bundle; import android.support.v7.app.AppCompatActivity; import android.text.Editable; import android.text.TextWatcher; import android.util.Log; import android.view.KeyEvent; import android.view.MotionEvent; import android.view.View; import android.widget.EditText;public class MainActivity extends AppCompatActivity {private KeyboardUtil keyboardUtil;private EditText mEditText;@SuppressLint("ClickableViewAccessibility")@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);mEditText = findViewById(R.id.edit_text);mEditText.setOnTouchListener(new View.OnTouchListener() {@Overridepublic boolean onTouch(View view, MotionEvent event) {if (keyboardUtil == null) {keyboardUtil = new KeyboardUtil(MainActivity.this, mEditText);keyboardUtil.hideSoftInputMethod();keyboardUtil.showKeyboard();} else {keyboardUtil.showKeyboard();}return false;}});mEditText.addTextChangedListener(new TextWatcher() {@Overridepublic void afterTextChanged(Editable s) {Log.i("字符變換后", "afterTextChanged");}@Overridepublic void beforeTextChanged(CharSequence s, int start, int count, int after) {Log.i("字符變換前", s + "-" + start + "-" + count + "-" + after);}@Overridepublic void onTextChanged(CharSequence s, int start, int before, int count) {Log.i("字符變換中", s + "-" + "-" + start + "-" + before + "-" + count);}});}@Overridepublic boolean onKeyDown(int keyCode, KeyEvent event) {if (keyCode == KeyEvent.KEYCODE_BACK) {if (keyboardUtil.isShow()) {keyboardUtil.hideKeyboard();} else {finish();}}return false;}}

4.相關屬性

android:keyBackground=”@drawable/selector_key”
* 按鍵的背景顏色

android:shadowColor=”#FFFFFF”
android:shadowRadius=”0.0”
* 不加這兩個屬性 文字會出現模糊

android:keyTextColor=”#000”
* 字體顏色

android:keyTextSize=”18sp”
* 字體大小

android:keyIcon=”@drawable/ic_delete”
* 按鍵上的圖標

android:codes=”20140”
* 輸出的內容 對照ASCII表

android:keyLabel=”京”
* 按鍵上顯示的內容

android:horizontalGap=”0px”
* 水平方向的間隙

android:verticalGap=”0px”
* 垂直反向的間隙

android:keyEdgeFlags=”right”
* 按鍵的對齊方式

github：https://github.com/yechaoa/PlateNumberKeyBoard

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