安卓实战：自定义软键盘 (2)

我会带着你远行 2023-01-02 08:29 165阅读 0赞

# 安卓实战：自定义软键盘 #

#### （注：安卓实战项目记账本的一部分内容） ####

在记账本中需要输入数字，萌生了想自己制作一个数字软键盘的内容,失败过程不眷数，直接展示最终成果  
首先是页面布局：

key.xml

<?xml version="1.0" encoding="utf-8"?>
    
    <Keyboard xmlns:android="http://schemas.android.com/apk/res/android"
        android:keyHeight="50dp"
        android:keyWidth="25%p"			//一行四个按键
        android:horizontalGap="1px"		//键盘与键盘间水平方向分割
        android:verticalGap="1px">			//键盘与键盘间垂直方向分割
        <Row>
            <Key android:codes="49" android:keyLabel="1"/>		//数字键1
            <Key android:codes="50" android:keyLabel="2"/>		//数字键2
            <Key android:codes="51" android:keyLabel="3"/>		//数字键3
            <Key android:codes="-5" android:keyLabel="删除"/>	//删除键
        </Row>
        <Row>
            <Key android:codes="52" android:keyLabel="4"/>		//数字键4
            <Key android:codes="53" android:keyLabel="5"/>		//数字键5
            <Key android:codes="54" android:keyLabel="6"/>		//数字键6
            <Key android:codes="-4" android:keyHeight="150dp" android:keyLabel="确定"/> 	//确定键，设置较大
        </Row>
        <Row>
            <Key android:codes="55" android:keyLabel="7"/>		//数字键7
            <Key android:codes="56" android:keyLabel="8"/>		//数字键8
            <Key android:codes="57" android:keyLabel="9"/>		//数字键9
        </Row>
        <Row>
            <Key android:codes="-3" android:keyLabel="清零"/>	//清零键
            <Key android:codes="48" android:keyLabel="0"/>		//0键
            <Key android:codes="46" android:keyLabel="."/>		//.键
        </Row>
    </Keyboard>

然后是逻辑编写：

KeyboardUtils.java

package com.example.mytally.utils;
    
    import android.inputmethodservice.Keyboard;
    import android.inputmethodservice.KeyboardView;
    import android.text.Editable;
    import android.text.InputType;
    import android.view.View;
    import android.widget.EditText;
    import com.example.mytally.R;
    
    public class KeyBoardUtils {
      private final Keyboard k1;    //自定义键盘
      private KeyboardView keyboardView;
      private EditText editText;	//设置一个变量EditText使得输入处随软键盘输入变化  
      //生成两者的构造方法
    
      public interface OnEnsureListener{
          public void onEnsure();
      }
      OnEnsureListener onEnsureListener;
    
      public void setOnEnsureListener(OnEnsureListener onEnsureListener) {
          this.onEnsureListener = onEnsureListener;
      }
    
      public KeyBoardUtils(KeyboardView keyboardView, EditText editText) {
          this.keyboardView = keyboardView;
          this.editText = editText;
          this.editText.setInputType(InputType.TYPE_NULL);  	//取消弹出系统键盘
          k1 = new Keyboard(this.editText.getContext(), R.xml.key);	//获取自定义键盘的对象
    
          this.keyboardView.setKeyboard(k1);  	//设置要显示键盘的样式
          this.keyboardView.setEnabled(true);
          this.keyboardView.setPreviewEnabled(false);		//能进行预览       
          this.keyboardView.setOnKeyboardActionListener(listener);  //设置键盘按钮被点击了的监听
      }
    
    KeyboardView.OnKeyboardActionListener listener = 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 = editText.getText();
              int start = editText.getSelectionStart();
              switch (primaryCode) {
                  case Keyboard.KEYCODE_DELETE:   //点击了删除键
                      if (editable!=null &&editable.length()>0) {
                          if (start>0) {
                              editable.delete(start-1,start);
                          }
                      }
                      break;
                  case Keyboard.KEYCODE_CANCEL:   //点击了清零
                      editable.clear();
                      break;
                  case Keyboard.KEYCODE_DONE:    //点击了完成
                      onEnsureListener.onEnsure();   //通过接口回调的方法，当点击确定时，可以调用这个方法
                      break;
                  default:  //其他数字直接插入
                      editable.insert(start,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() {
          }
      };
    
      //    显示键盘
      public void showKeyboard(){
          int visibility = keyboardView.getVisibility();
          if (visibility == View.INVISIBLE ||visibility==View.GONE) {
              keyboardView.setVisibility(View.VISIBLE);
          }
      }
    
      //    隐藏键盘
      public void hideKeyboard(){
          int visibility = keyboardView.getVisibility();
          if (visibility== View.VISIBLE||visibility==View.INVISIBLE) {
              keyboardView.setVisibility(View.GONE);
          }
      }
    }

成果图：  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NTE2NjE5NQ_size_16_color_FFFFFF_t_70_pic_center]

有关于这个的问题可以随时找我交流

[原文链接][Link 1]

作者：黄书竞

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NTE2NjE5NQ_size_16_color_FFFFFF_t_70_pic_center]: /images/20221120/2d4c6e6b428142579649721d2ef0af24.png
[Link 1]: https://blog.csdn.net/weixin_45166195/article/details/112169995