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背景

大部分的金融App會對默認(rèn)的數(shù)字鍵盤進行處理，以實現(xiàn)自定義的數(shù)字安全鍵盤。基于此，本文對對微信數(shù)字鍵盤樣式進行了仿寫，實現(xiàn)了一套自定義的數(shù)字安全鍵盤（支持隨機數(shù)字分布）。

一、圖示效果

二、需要考慮的問題

布局的實現(xiàn)方式；
demo中使用了popupwindow，通過xml文件進行Tablayout布局。
禁掉EditText默認(rèn)軟鍵盤的彈出，替換為自定義的數(shù)字鍵盤及與其它EditText切換焦點時的彈出效果；
刪除和增加字符時需要同步更新光標(biāo)的位置；
隨機數(shù)字分布的實現(xiàn)；

三、實現(xiàn)代碼

1.MainActivity調(diào)用處代碼：

public class MainActivity extends AppCompatActivity {    private static final String TAG = "MainActivity";    private EditText numberEt;    private KeyboardPopupWindow keyboardPopupWindow;    private boolean isUiCreated = false;
    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        initView();    }
    private void initView() {        numberEt = findViewById(R.id.numberEt);        keyboardPopupWindow = new KeyboardPopupWindow(MainActivity.this, getWindow().getDecorView(), numberEt,true);//        numberEt.setInputType(InputType.TYPE_NULL);//該設(shè)置會導(dǎo)致光標(biāo)不可見        numberEt.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                if (keyboardPopupWindow != null) {                    keyboardPopupWindow.show();                }            }        });        numberEt.setOnFocusChangeListener(new View.OnFocusChangeListener() {            @Override            public void onFocusChange(View v, boolean hasFocus) {                if (keyboardPopupWindow != null && isUiCreated) {//isUiCreated 很重要，Unable to add window -- token null is not valid; is your activity running?                    keyboardPopupWindow.refreshKeyboardOutSideTouchable(!hasFocus);// 需要等待頁面創(chuàng)建完成后焦點變化才去顯示自定義鍵盤                }
                if (hasFocus) {//隱藏系統(tǒng)軟鍵盤                    InputMethodManager imm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);                    imm.hideSoftInputFromWindow(numberEt.getWindowToken(), 0);                }
            }        });    }
    @Override    public void onWindowFocusChanged(boolean hasFocus) {        super.onWindowFocusChanged(hasFocus);        isUiCreated = true;    }

    @Override    protected void onDestroy() {        if (keyboardPopupWindow != null) {            keyboardPopupWindow.releaseResources();        }        super.onDestroy();    }}

可以看到，這塊的代碼實現(xiàn)很簡單，主要是通過KeyboardPopupWindow 這個自定義的View來實現(xiàn)鍵盤彈出及按鍵點擊效果。需要注意的是isUiCreated 這個標(biāo)志位，需要通過onWindowFocusChanged等方法來確定當(dāng)前頁面加載完畢后去刷新自定義鍵盤的狀態(tài)，否則會報錯。

2.自定義數(shù)字鍵盤的代碼：

public class KeyboardPopupWindow extends PopupWindow {    private static final String TAG = "KeyboardPopupWindow";    private Context context;    private View anchorView;    private View parentView;    private EditText editText;    private boolean isRandomSort = false;//數(shù)字是否隨機排序    private List<Integer> list = new ArrayList<>();    private int[] commonButtonIds = new int[]{R.id.button00, R.id.button01, R.id.button02, R.id.button03,            R.id.button04, R.id.button05, R.id.button06, R.id.button07, R.id.button08, R.id.button09};
    /**     * @param context     * @param anchorView     * @param editText     * @param isRandomSort 數(shù)字是否隨機排序     */    public KeyboardPopupWindow(Context context, View anchorView, EditText editText, boolean isRandomSort) {        this.context = context;        this.anchorView = anchorView;        this.editText = editText;        this.isRandomSort = isRandomSort;        if (context == null || anchorView == null) {            return;        }        initConfig();        initView();    }

    private void initConfig() {        setOutsideTouchable(false);        setFocusable(false);        setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT));        forbidDefaultSoftKeyboard();    }
    /**     * 禁止系統(tǒng)默認(rèn)的軟鍵盤彈出     */    private void forbidDefaultSoftKeyboard() {        if (editText == null) {            return;        }        if (android.os.Build.VERSION.SDK_INT > 10) {//4.0以上，使用反射的方式禁止系統(tǒng)自帶的軟鍵盤彈出            try {                Class<EditText> cls = EditText.class;                Method setShowSoftInputOnFocus;                setShowSoftInputOnFocus = cls.getMethod("setShowSoftInputOnFocus", boolean.class);                setShowSoftInputOnFocus.setAccessible(true);                setShowSoftInputOnFocus.invoke(editText, false);            } catch (Exception e) {                e.printStackTrace();            }        }    }
    /**     * 刷新自定義的popupwindow是否outside可觸摸反應(yīng)：如果是不可觸摸的，則顯示該軟鍵盤view     *     * @param isTouchable     */    public void refreshKeyboardOutSideTouchable(boolean isTouchable) {        setOutsideTouchable(isTouchable);        if (!isTouchable) {            show();        } else {            dismiss();        }    }
    private void initView() {        parentView = LayoutInflater.from(context).inflate(R.layout.keyboadview, null);        initKeyboardView(parentView);        setWidth(ViewGroup.LayoutParams.MATCH_PARENT);        setHeight(ViewGroup.LayoutParams.WRAP_CONTENT);        setContentView(parentView);    }
    private void initKeyboardView(View view) {        LinearLayout dropdownLl = view.findViewById(R.id.dropdownLl);        dropdownLl.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                dismiss();            }        });
        //①給數(shù)字鍵設(shè)置點擊監(jiān)聽        for (int i = 0; i < commonButtonIds.length; i++) {            final Button button = view.findViewById(commonButtonIds[i]);            button.setOnClickListener(new View.OnClickListener() {                @Override                public void onClick(View v) {                    int curSelection = editText.getSelectionStart();                    int length = editText.getText().toString().length();                    if (curSelection < length) {                        String content = editText.getText().toString();                        editText.setText(content.substring(0, curSelection) + button.getText() + content.subSequence(curSelection, length));                        editText.setSelection(curSelection + 1);                    } else {                        editText.setText(editText.getText().toString() + button.getText());                        editText.setSelection(editText.getText().toString().length());                    }                }            });        }
        //②給小數(shù)點按鍵設(shè)置點擊監(jiān)聽        view.findViewById(R.id.buttonDot).setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                int curSelection = editText.getSelectionStart();                int length = editText.getText().toString().length();                if (curSelection < length) {                    String content = editText.getText().toString();                    editText.setText(content.substring(0, curSelection) + "." + content.subSequence(curSelection, length));                    editText.setSelection(curSelection + 1);                } else {                    editText.setText(editText.getText().toString() + ".");                    editText.setSelection(editText.getText().toString().length());                }            }        });
        //③給叉按鍵設(shè)置點擊監(jiān)聽        view.findViewById(R.id.buttonCross).setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                int length = editText.getText().toString().length();                int curSelection = editText.getSelectionStart();                if (length > 0 && curSelection > 0 && curSelection <= length) {                    String content = editText.getText().toString();                    editText.setText(content.substring(0, curSelection - 1) + content.subSequence(curSelection, length));                    editText.setSelection(curSelection - 1);                }            }        });    }

    public void show() {        if (!isShowing() && anchorView != null) {            doRandomSortOp();            this.showAtLocation(anchorView, Gravity.BOTTOM, 0, 0);        }    }
    /**     * 隨機分布數(shù)字     */    private void doRandomSortOp() {        if (parentView == null) {            return;        }        if (!isRandomSort) {            for (int i = 0; i < commonButtonIds.length; i++) {                final Button button = parentView.findViewById(commonButtonIds[i]);                button.setText("" + i);            }        } else {            list.clear();            Random ran = new Random();            while (list.size() < commonButtonIds.length) {                int n = ran.nextInt(commonButtonIds.length);                if (!list.contains(n))                    list.add(n);            }            for (int i = 0; i < commonButtonIds.length; i++) {                final Button button = parentView.findViewById(commonButtonIds[i]);                button.setText("" + list.get(i));            }        }    }
    public void releaseResources() {        this.dismiss();        context = null;        anchorView = null;        if (list != null) {            list.clear();            list = null;        }    }  }

代碼實現(xiàn)的邏輯相對簡單：

通過給popupwindow設(shè)置contentView、彈出位置、邊界外觸摸參數(shù)等數(shù)值，實現(xiàn)大體樣式上的效果；
給contentView中的每個button設(shè)置點擊事件，并處理傳遞的EditText數(shù)值及焦點變化情況；
設(shè)置隨機標(biāo)志位，進行數(shù)值鍵盤數(shù)值隨機的分布；
forbidDefaultSoftKeyboard中處理：禁止EditText默認(rèn)的軟鍵盤彈出。因為要實現(xiàn)EditText焦點仍舊可見的效果，目前試過的其它集中方式仍有較大的缺陷，所以是通過反射的方法來達(dá)到目的。

四.小結(jié)

當(dāng)然，除了以上方式，還可以使用系統(tǒng)的KeyboardView和Keyboard來實現(xiàn)相應(yīng)的效果。

在仿寫的過程中會發(fā)現(xiàn)，實現(xiàn)這一效果會涉及到一些體驗性的細(xì)節(jié)點，而微信正是做到了這一點，所以在使用層面上會很方便。有些細(xì)節(jié)點會可能會比實現(xiàn)整個大致效果更為麻煩，但有時候恰巧這些很容易被忽視的小九九是與眾不同的地方。

源碼地址：

https://github.com/ganshenml/KeyboardPopupWindow

到這里就結(jié)束啦。

Android仿微信實現(xiàn)安全數(shù)字鍵盤功能

背景

一、圖示效果

二、需要考慮的問題

三、實現(xiàn)代碼