Android自定义键盘

这是之前公司项目，需要用身份证来查询，绝大部分人的身份证是纯数字的，这个可以直接在EditText设置inputType，输入法弹出时会自动切换到数字键盘，但是，碰到身份证含有X的，这就麻烦了，得手动切换到英文输入界面，然后还得再切换回来，甚至还牵扯到大小写处理，虽然不算是个问题，但是互联网思维嘛，人性化！所以，本着不怕麻烦的精神，还是学习了自定义个键盘来提升用户体验

需要说的东西感觉不多

老规矩，先看效果：

首先，先新建个xml（应该一看就明白，没什么可说的），来定义我们键盘上要摆放的东西(codes为ASCII码)

<Keyboard xmlns:android="http://schemas.android.com/apk/res/android"
    android:keyHeight="50dp"
    android:keyWidth="25%p">
    <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="9995"
            android:keyEdgeFlags="right"
            android:keyLabel="重输" />
    </Row>
    <Row>
        <Key
            android:codes="52"
            android:keyLabel="4" />
        <Key
            android:codes="53"
            android:keyLabel="5" />
        <Key
            android:codes="54"
            android:keyLabel="6" />
        <Key
            android:codes="-5"
            android:keyLabel="删除"
            android:isRepeatable="true"
            android:keyEdgeFlags="right"/>
    </Row>
    <Row>
        <Key
            android:codes="55"
            android:keyLabel="7" />
        <Key
            android:codes="56"
            android:keyLabel="8" />
        <Key
            android:codes="57"
            android:keyLabel="9" />
        <Key
            android:codes="88"
            android:keyLabel="X"
            android:keyEdgeFlags="right"/>
    </Row>
    <Row>
        <Key
            android:codes="9994"
            android:keyLabel="←" />
        <Key
            android:codes="48"
            android:keyLabel="0" />
        <Key
            android:codes="9996"
            android:keyLabel="→" />
        <Key
            android:codes="-4"
            android:keyLabel="√"
            android:keyEdgeFlags="right"/>
    </Row>
</Keyboard>

然后新建个类，CustomKeyboard，来控制我们按键的操作

public class CustomKeyboard {
    private EditText mEdittext;
    private KeyboardView mKeyboardView;
    private Keyboard mKeyboard;
    private IKeyboardFinish mIKeyboardFinish;

    public CustomKeyboard(Context context, KeyboardView keyboardView, EditText editText, IKeyboardFinish iKeyboardFinish){
        this.mEdittext = editText;
        this.mIKeyboardFinish = iKeyboardFinish;
        mKeyboard = new Keyboard(context, R.xml.keyboard);//从xml中加载自定义的键盘
        mKeyboardView = keyboardView;
        mKeyboardView.setKeyboard(mKeyboard);
        mKeyboardView.setPreviewEnabled(false);
        mKeyboardView.setOnKeyboardActionListener(actionListener);
    }
    private KeyboardView.OnKeyboardActionListener actionListener = 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 index = mEdittext.getSelectionStart();//光标位置
            switch (primaryCode){

                case Keyboard.KEYCODE_DELETE://回退
                    if (editable != null && editable.length() > 0){
                        if (index > 0){
                            editable.delete(index - 1,index);
                        }
                    }
                    break;
                case Keyboard.KEYCODE_DONE://完成
                    //hideKeyboard();
                    mIKeyboardFinish.inputFinish();//回调
                    break;
                case 9995://重输
                    mEdittext.setText("");
                    break;
                case 9994://左移
                    if (index > 0){
                        mEdittext.setSelection(index - 1);
                    }
                    break;
                case 9996://右移
                    if (index < mEdittext.length()){
                        mEdittext.setSelection(index + 1);
                    }
                    break;
                default:
                    editable.insert(index,Character.toString((char)primaryCode));
                    break;
            }
        }

        @Override
        public void onText(CharSequence text) {

        }

        @Override
        public void swipeLeft() {

        }

        @Override
        public void swipeRight() {

        }

        @Override
        public void swipeDown() {

        }

        @Override
        public void swipeUp() {

        }
    };

    public void showKeyboard(){
        if(mKeyboardView.getVisibility() != View.VISIBLE){
            mKeyboardView.setVisibility(View.VISIBLE);
        }
    }

    public void hideKeyboard(){
        if (mKeyboardView.getVisibility() == View.VISIBLE){
            mKeyboardView.setVisibility(View.GONE);
        }
    }
}

定义个回调接口：

public interface IKeyboardFinish {
    void inputFinish();
}

然后在Activity的布局文件中定义

<android.inputmethodservice.KeyboardView
            android:id="@+id/customKeyboard"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_alignParentBottom="true"
            android:focusable="true"
            android:focusableInTouchMode="true"
            android:shadowRadius="1.0" />

后台关键代码：

private MaterialEditText edtNum;//大名鼎鼎的MaterialEditText，github上一搜便知
private Context mContext = this;
private CustomKeyboard mCustomKeyboard;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    edtNum = (MaterialEditText) findViewById(R.id.edtNum);
    //屏蔽掉系统默认输入法
    if (Build.VERSION.SDK_INT <= 10) {
        edtNum.setInputType(InputType.TYPE_NULL);
    } else {
        getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_HIDDEN);
        try {
            Class<EditText> cls = EditText.class;
            Method setShowSoftInputOnFocus = cls.getMethod("setShowSoftInputOnFocus", boolean.class);
            setShowSoftInputOnFocus.setAccessible(true);
            setShowSoftInputOnFocus.invoke(edtNum, false);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    //初始化键盘，传入回调接口，以便在此处进行完成后的操作。默认就显示键盘
    KeyboardView keyboardView = (KeyboardView) findViewById(R.id.customKeyboard);
    mCustomKeyboard = new CustomKeyboard(mContext, keyboardView, edtNum, iKeyboardFinish);
    mCustomKeyboard.showKeyboard();
    edtNum.setOnTouchListener(new View.OnTouchListener() {
        @Override
        public boolean onTouch(View v, MotionEvent event) {
            mCustomKeyboard.showKeyboard();
            return false;
        }
    });
}

/**
 * 输入完成
 */
private IKeyboardFinish iKeyboardFinish = new IKeyboardFinish() {
    @Override
    public void inputFinish() {
        String idcard = edtNum.getText().toString();
        Toast.makeText(mContext,idcard,Toast.LENGTH_SHORT).show();

    }
};

PS：键盘是android默认的样式，没有研究怎么改样式，知道的大xiong弟麻烦留言说说呗

代码：https://github.com/DonnyHe/IDcardKeyboard