Android自定义软键盘的设计与实现代码

偶然间发现了Android.inputmethodservice.Keyboard类，即android可以自定义键盘类，做了一个简单例子供大家参考。

效果如下：

先看界面布局文件

通过布局文件可以看出界面上有两个输入框，其中一个是密码输入框，界面上还有一个隐藏的键盘控件。

在res下新建xml文件夹，在xml文件夹中新建qwerty.xml和symbols.xml文件. qwerty.xml 是字母键盘布局，symbols.xml 是数字键盘布局，内如如下:

qwerty.xml内容

symbols.xml 内容

KeydemoActivity.java

package cn.key; 
  
import android.app.Activity; 
import android.content.Context; 
import android.os.Bundle; 
import android.text.InputType; 
import android.view.MotionEvent; 
import android.view.View; 
import android.view.View.OnTouchListener; 
import android.widget.EditText; 
  
public class KeydemoActivity extends Activity { 
    private Context ctx; 
    private Activity act; 
    private EditText edit; 
    private EditText edit1; 
  
    @Override 
    public void onCreate(Bundle savedInstanceState) { 
 super.onCreate(savedInstanceState); 
 setContentView(R.layout.main); 
 ctx = this; 
 act = this; 
  
 edit = (EditText) this.findViewById(R.id.edit); 
 edit.setInputType(InputType.TYPE_NULL); 
  
 edit1 = (EditText) this.findViewById(R.id.edit1); 
  
 edit.setonTouchListener(new onTouchListener() { 
     @Override 
     public boolean onTouch(View v, MotionEvent event) { 
  new KeyboardUtil(act, ctx, edit).showKeyboard(); 
  return false; 
     } 
 }); 
  
 edit1.setonTouchListener(new onTouchListener() { 
     @Override 
     public boolean onTouch(View v, MotionEvent event) { 
  int inputback = edit1.getInputType(); 
  edit1.setInputType(InputType.TYPE_NULL); 
  new KeyboardUtil(act, ctx, edit1).showKeyboard(); 
  edit1.setInputType(inputback); 
  return false; 
     } 
 }); 
  
    } 
} 

KeyboardUtil.java

package cn.key; 
  
import java.util.List; 
  
import android.app.Activity; 
import android.content.Context; 
import android.inputmethodservice.Keyboard; 
import android.inputmethodservice.KeyboardView; 
import android.inputmethodservice.Keyboard.Key; 
import android.inputmethodservice.KeyboardView.OnKeyboardActionListener; 
import android.text.Editable; 
import android.view.View; 
import android.widget.EditText; 
  
public class KeyboardUtil { 
    private Context ctx; 
    private Activity act; 
    private KeyboardView keyboardView; 
    private Keyboard k1;// 字母键盘 
    private Keyboard k2;// 数字键盘 
    public boolean isnun = false;// 是否数据键盘 
    public boolean isupper = false;// 是否大写 
  
    private EditText ed; 
  
    public KeyboardUtil(Activity act, Context ctx, EditText edit) { 
 this.act = act; 
 this.ctx = ctx; 
 this.ed = edit; 
 k1 = new Keyboard(ctx, R.xml.qwerty); 
 k2 = new Keyboard(ctx, R.xml.symbols); 
 keyboardView = (KeyboardView) act.findViewById(R.id.keyboard_view); 
 keyboardView.setKeyboard(k1); 
 keyboardView.setEnabled(true); 
 keyboardView.setPreviewEnabled(true); 
 keyboardView.setonKeyboardActionListener(listener); 
    } 
  
    private onKeyboardActionListener listener = new onKeyboardActionListener() { 
 @Override 
 public void swipeUp() { 
 } 
  
 @Override 
 public void swipeRight() { 
 } 
  
 @Override 
 public void swipeLeft() { 
 } 
  
 @Override 
 public void swipeDown() { 
 } 
  
 @Override 
 public void onText(CharSequence text) { 
 } 
  
 @Override 
 public void onRelease(int primaryCode) { 
 } 
  
 @Override 
 public void onPress(int primaryCode) { 
 } 
  
 @Override 
 public void onKey(int primaryCode, int[] keyCodes) { 
     Editable editable = ed.getText(); 
     int start = ed.getSelectionStart(); 
     if (primaryCode == Keyboard.KEYCODE_CANCEL) {// 完成 
  hideKeyboard(); 
     } else if (primaryCode == Keyboard.KEYCODE_DELETE) {// 回退 
  if (editable != null && editable.length() > 0) { 
      if (start > 0) { 
   editable.delete(start - 1, start); 
      } 
  } 
     } else if (primaryCode == Keyboard.KEYCODE_SHIFT) {// 大小写切换 
  changeKey(); 
  keyboardView.setKeyboard(k1); 
  
     } else if (primaryCode == Keyboard.KEYCODE_MODE_CHANGE) {// 数字键盘切换 
  if (isnun) { 
      isnun = false; 
      keyboardView.setKeyboard(k1); 
  } else { 
      isnun = true; 
      keyboardView.setKeyboard(k2); 
  } 
     } else if (primaryCode == 57419) { // go left 
  if (start > 0) { 
      ed.setSelection(start - 1); 
  } 
     } else if (primaryCode == 57421) { // go right 
  if (start < ed.length()) { 
      ed.setSelection(start + 1); 
  } 
     } else { 
  editable.insert(start, Character.toString((char) primaryCode)); 
     } 
 } 
    }; 
      
     
    private void changeKey() { 
 List keylist = k1.getKeys(); 
 if (isupper) {//大写切换小写 
     isupper = false; 
     for(Key key:keylist){ 
  if (key.label!=null && isword(key.label.toString())) { 
      key.label = key.label.toString().toLowerCase(); 
      key.codes[0] = key.codes[0]+32; 
  } 
     } 
 } else {//小写切换大写 
     isupper = true; 
     for(Key key:keylist){ 
  if (key.label!=null && isword(key.label.toString())) { 
      key.label = key.label.toString().toUpperCase(); 
      key.codes[0] = key.codes[0]-32; 
  } 
     } 
 } 
    } 
  
  public void showKeyboard() { 
    int visibility = keyboardView.getVisibility(); 
    if (visibility == View.GONE || visibility == View.INVISIBLE) { 
      keyboardView.setVisibility(View.VISIBLE); 
    } 
  } 
    
  public void hideKeyboard() { 
    int visibility = keyboardView.getVisibility(); 
    if (visibility == View.VISIBLE) { 
      keyboardView.setVisibility(View.INVISIBLE); 
    } 
  } 
    
  private boolean isword(String str){ 
      String wordstr = "abcdefghijklmnopqrstuvwxyz"; 
      if (wordstr.indexOf(str.toLowerCase())>-1) { 
     return true; 
 } 
      return false; 
  } 
  
} 

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持考高分网。