这篇文章主要介绍了Android如何实现仿微信数字键盘，具有一定借鉴价值，感兴趣的朋友可以参考下，希望大家阅读完这篇文章之后大有收获，下面让小编带着大家一起了解一下。
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；
1.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。
2.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}; /** * @param context * @param anchorView * @param editText * @param isRandomSort 数字是否随机排序 */ 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(); } /** * 禁止系统默认的软键盘弹出 */ 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(); } } } /** * 刷新自定义的popupwindow是否outside可触摸反应：如果是不可触摸的，则显示该软键盘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); } } /** * 随机分布数字 */ 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; } } }代码实现的逻辑相对简单：
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；
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；
设置随机标志位，进行数值键盘数值随机的分布；
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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