自定义输入车牌号键盘

1.首先在res目录下新建文件夹xml,并在xml文件夹下创建3个文件，分别配置省、市、车牌号信息

（1）province_abbreviation.xml

（2）letters.xml

（3）number_or_letters.xml

2.写键盘工具类KeybordUtil

public class Keyboard_Util {
    private Context mContext;
    private Activity mActivity;
    private KeyboardView mKeyboardView;
    private EditText mEdit;
    private int keybordType;
    /**
     * 省份简称键盘
     */
    private Keyboard province_keyboard;
    /**
     * 数字与大写字母键盘
     */
    private Keyboard number_keyboar;
    /**
     * 字母键盘
     */
    private Keyboard letter_keybord;


    public Keyboard_Util(Activity activity, EditText edit) {
        mActivity = activity;
        mContext = activity;
        mEdit = edit;

        province_keyboard = new Keyboard(mContext, R.xml.province_abbreviation);
        number_keyboar = new Keyboard(mContext, R.xml.number_or_letters);
        letter_keybord = new Keyboard(mContext, R.xml.letters);

        mKeyboardView = (KeyboardView) activity.findViewById(R.id.keyboard_view);
        mKeyboardView.setEnabled(true);
        mKeyboardView.setPreviewEnabled(false);
        mKeyboardView.setOnKeyboardActionListener(listener);
    }

    private KeyboardView.OnKeyboardActionListener listener = new KeyboardView.OnKeyboardActionListener() {
        @Override
        public void swipeUp() {
        }

        @Override
        public void swipeRight() {
        }

        @Override
        public void swipeLeft() {
        }

        @Override
        public void swipeDown() {
        }

        @Override
        public void onText(CharSequence text) {
        }

        @Override
        public void onRelease(int primaryCode) {
        }

        @Override
        public void onPress(int primaryCode) {
        }

        @Override
        public void onKey(int primaryCode, int[] keyCodes) {
            Editable editable = mEdit.getText();
            int start = mEdit.getSelectionStart();
            if (primaryCode == -3) {
                if (editable != null && editable.length() > 0) {
                    if (start > 0) {
                        editable.delete(start - 1, start);
                    }
                }
            } else {
                if (keybordType==0||keybordType==1){
                    editable.replace(0,editable.length(),Character.toString((char) primaryCode));
                }else {
                    editable.insert(start, Character.toString((char) primaryCode));
                }

            }
        }
    };


    /**
     * 切换键盘
     *
     * @param keybordType
     */
    public void changeKeybord(int keybordType) {
        this.keybordType=keybordType;
        switch (keybordType) {
            case 0:
                mKeyboardView.setKeyboard(province_keyboard);
                break;
            case 1:
                mKeyboardView.setKeyboard(letter_keybord);
                break;
            case 2:
                mKeyboardView.setKeyboard(number_keyboar);
                break;
        }
    }

    /**
     * 软键盘展示状态
     */
    public boolean isShow() {
        return mKeyboardView.getVisibility() == View.VISIBLE;
    }

    /**
     * 软键盘展示
     */
    public void showKeyboard() {
        int visibility = mKeyboardView.getVisibility();
        if (visibility == View.GONE || visibility == View.INVISIBLE) {
            mKeyboardView.setVisibility(View.VISIBLE);
        }
    }

    /**
     * 软键盘隐藏
     */
    public void hideKeyboard() {
        int visibility = mKeyboardView.getVisibility();
        if (visibility == View.VISIBLE) {
            mKeyboardView.setVisibility(View.INVISIBLE);
        }
    }

    /**
     * 禁掉系统软键盘
     */
    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) {
            // 4.2
            methodName = "setShowSoftInputOnFocus";
        } else if (currentVersion >= 14) {
            // 4.0
            methodName = "setSoftInputShownOnFocus";
        }
        if (methodName == null) {
            mEdit.setInputType(InputType.TYPE_NULL);
        } else {
            Class 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.布局

4.使用

public class MainActivity extends AppCompatActivity {
    private Keyboard_Util keyboardUtil;
    private EditText et_searchtxt;
    private EditText et_province;
    private EditText et_city;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        et_province=findViewById(R.id.et_province);
        et_city=findViewById(R.id.et_city);
        et_searchtxt = (EditText) findViewById(R.id.et_searchtxt);
        et_province.setOnTouchListener(new View.OnTouchListener() {
            @Override
            public boolean onTouch(View view, MotionEvent event) {
                    keyboardUtil = new Keyboard_Util(MainActivity.this, et_province);
                    keyboardUtil.hideSoftInputMethod();
                    keyboardUtil.changeKeybord(0);
                    keyboardUtil.showKeyboard();
                return false;
            }
        });
        et_province.addTextChangedListener(new TextWatcher() {
            @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) {
                et_city.requestFocus();
                et_city.setFocusable(true);
                keyboardUtil = new Keyboard_Util(MainActivity.this, et_city);
                keyboardUtil.hideSoftInputMethod();
                keyboardUtil.changeKeybord(1);
                keyboardUtil.showKeyboard();
            }
        });
        et_city.setOnTouchListener(new View.OnTouchListener() {
            @Override
            public boolean onTouch(View view, MotionEvent event) {

                    keyboardUtil = new Keyboard_Util(MainActivity.this, et_city);
                    keyboardUtil.hideSoftInputMethod();
                    keyboardUtil.changeKeybord(1);
                    keyboardUtil.showKeyboard();
                return false;
            }
        });

        et_city.addTextChangedListener(new TextWatcher() {
            @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) {
                if (s.length()>0){
                    et_searchtxt.requestFocus();
                    et_searchtxt.setFocusable(true);
                    keyboardUtil = new Keyboard_Util(MainActivity.this, et_searchtxt);
                    keyboardUtil.hideSoftInputMethod();
                    keyboardUtil.changeKeybord(2);
                    keyboardUtil.showKeyboard();
                }
            }
        });

        et_searchtxt.setOnTouchListener(new View.OnTouchListener() {
            @Override
            public boolean onTouch(View view, MotionEvent event) {
                keyboardUtil = new Keyboard_Util(MainActivity.this, et_searchtxt);
                keyboardUtil.hideSoftInputMethod();
                keyboardUtil.changeKeybord(2);
                keyboardUtil.showKeyboard();

                return false;
            }
        });

    }
}