Android如何实现仿微信数字键盘

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一、图示效果

二、需要考虑的问题

布局的实现方式；
demo中使用了popupwindow，通过xml文件进行Tablayout布局。

禁掉EditText默认软键盘的弹出，替换为自定义的数字键盘及与其它EditText切换焦点时的弹出效果；

删除和增加字符时需要同步更新光标的位置；

随机数字分布的实现；

三、实现代码

MainActivity调用处代码：

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);//该设置会导致光标不可见        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);// 需要等待页面创建完成后焦点变化才去显示自定义键盘                }                if (hasFocus) {//隐藏系统软键盘                    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，这块的代码实现很简单，主要是通过KeyboardPopupWindow 这个自定义的View来实现键盘弹出及按键点击效果。需要注意的是isUiCreated 这个标志位，需要通过onWindowFocusChanged等方法来确定当前页面加载完毕后去刷新自定义键盘的状态，否则会报错。

自定义数字键盘的代码：

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;//数字是否随机排序    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};        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();    }        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统自带的软键盘弹出            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();            }        }    }        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给数字键设置点击监听        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给小数点按键设置点击监听        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给叉按键设置点击监听        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);        }    }        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;        }    }  }

代码实现的逻辑相对简单：

1. 通过给popupwindow设置contentView、弹出位置、边界外触摸参数等数值，实现大体样式上的效果；

2. 给contentView中的每个button设置点击事件，并处理传递的EditText数值及焦点变化情况；

3. 设置随机标志位，进行数值键盘数值随机的分布；

4. forbidDefaultSoftKeyboard中处理：禁止EditText默认的软键盘弹出。因为要实现EditText焦点仍旧可见的效果，目前试过的其它集中方式仍有较大的缺陷，所以是通过反射的方法来达到目的。

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