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

 <?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
  android:layout_width="fill_parent" 
  android:layout_height="fill_parent" 
  android:orientation="vertical" > 
  <EditText 
    android:id="@+id/edit" 
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" /> 
  <EditText 
    android:id="@+id/edit1" 
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:password="true" /> 
  <RelativeLayout 
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" > 
    <android.inputmethodservice.KeyboardView 
      android:id="@+id/keyboard_view" 
      android:layout_width="fill_parent" 
      android:layout_height="wrap_content" 
      android:layout_alignParentBottom="true" 
      android:focusable="true" 
      android:focusableInTouchMode="true" 
      android:background="@color/lightblack" 
      android:keyBackground="@drawable/btn_keyboard_key" 
      android:keyTextColor="@color/white" 
      android:visibility="gone" /> 
  </RelativeLayout> 
</LinearLayout> 

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

<?xml version="1.0" encoding="UTF-8"?> 
<Keyboard android:keyWidth="10.000002%p" android:keyHeight="@dimen/key_height" 
    android:horizontalGap="0.0px" android:verticalGap="0.0px" 
    xmlns:android="http://schemas.android.com/apk/res/android"> 
    <Row> 
        <Key android:codes="113" android:keyEdgeFlags="left" 
            android:keyLabel="q" /> 
        <Key android:codes="119" android:keyLabel="w" /> 
        <Key android:codes="101" android:keyLabel="e" /> 
        <Key android:codes="114" android:keyLabel="r" /> 
        <Key android:codes="116" android:keyLabel="t" /> 
        <Key android:codes="121" android:keyLabel="y" /> 
        <Key android:codes="117" android:keyLabel="u" /> 
        <Key android:codes="105" android:keyLabel="i" /> 
        <Key android:codes="111" android:keyLabel="o" /> 
        <Key android:codes="112" android:keyEdgeFlags="right" 
            android:keyLabel="p" /> 
    </Row> 
    <Row> 
        <Key android:horizontalGap="4.999995%p" android:codes="97" 
            android:keyEdgeFlags="left" android:keyLabel="a" /> 
        <Key android:codes="115" android:keyLabel="s" /> 
        <Key android:codes="100" android:keyLabel="d" /> 
        <Key android:codes="102" android:keyLabel="f" /> 
        <Key android:codes="103" android:keyLabel="g" /> 
        <Key android:codes="104" android:keyLabel="h" /> 
        <Key android:codes="106" android:keyLabel="j" /> 
        <Key android:codes="107" android:keyLabel="k" /> 
        <Key android:codes="108" android:keyEdgeFlags="right" 
            android:keyLabel="l" /> 
    </Row> 
    <Row> 
        <Key android:keyWidth="14.999998%p" android:codes="-1" 
            android:keyEdgeFlags="left" android:isModifier="true" 
            android:isSticky="true" android:keyIcon="@drawable/sym_keyboard_shift" /> 
        <Key android:codes="122" android:keyLabel="z" /> 
        <Key android:codes="120" android:keyLabel="x" /> 
        <Key android:codes="99" android:keyLabel="c" /> 
        <Key android:codes="118" android:keyLabel="v" /> 
        <Key android:codes="98" android:keyLabel="b" /> 
        <Key android:codes="110" android:keyLabel="n" /> 
        <Key android:codes="109" android:keyLabel="m" /> 
        <Key android:keyWidth="14.999998%p" android:codes="-5" 
            android:keyEdgeFlags="right" android:isRepeatable="true" 
            android:keyIcon="@drawable/sym_keyboard_delete" /> 
    </Row> 
    <Row android:rowEdgeFlags="bottom"> 
        <Key android:keyWidth="20.000004%p" android:codes="-2" 
            android:keyLabel="12#" /> 
        <Key android:keyWidth="14.999998%p" android:codes="44" 
            android:keyLabel="," /> 
        <Key android:keyWidth="29.999996%p" android:codes="32" 
            android:isRepeatable="true" android:keyIcon="@drawable/sym_keyboard_space" /> 
        <Key android:keyWidth="14.999998%p" android:codes="46" 
            android:keyLabel="." /> 
        <Key android:keyWidth="20.000004%p" android:codes="-3" 
            android:keyEdgeFlags="right" android:keyLabel="完成" /> 
    </Row> 
</Keyboard> 

symbols.xml 内容

<?xml version="1.0" encoding="utf-8"?> 
<Keyboard xmlns:android="http://schemas.android.com/apk/res/android" 
    android:keyWidth="25%p" android:horizontalGap="0px" 
    android:verticalGap="0px" android:keyHeight="@dimen/key_height"> 
    <Row> 
        <Key android:codes="49" android:keyLabel="1" /> 
        <Key android:codes="50" android:keyLabel="2" /> 
        <Key android:codes="51" android:keyLabel="3" /> 
        <Key android:codes="57419" android:keyEdgeFlags="right" 
            android:keyIcon="@drawable/sym_keyboard_left" /> 
    </Row> 
    <Row> 
        <Key android:codes="52" android:keyLabel="4" /> 
        <Key android:codes="53" android:keyLabel="5" /> 
        <Key android:codes="54" android:keyLabel="6" /> 
        <Key android:codes="57421" android:keyEdgeFlags="right" 
            android:keyIcon="@drawable/sym_keyboard_right" /> 
    </Row> 
    <Row> 
        <Key android:codes="55" android:keyLabel="7" /> 
        <Key android:codes="56" android:keyLabel="8" /> 
        <Key android:codes="57" android:keyLabel="9" /> 
        <Key android:codes="-3" android:keyHeight="100dip" 
            android:keyEdgeFlags="right" android:isRepeatable="true" 
            android:keyLabel="完成" /> 
    </Row> 
    <Row> 
        <Key android:codes="-2" android:keyLabel="ABC" /> 
        <Key android:codes="48" android:keyLabel="0" /> 
        <Key android:codes="-5" android:keyIcon="@drawable/sym_keyboard_delete" /> 
    </Row> 
</Keyboard> 

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<Key> 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; 
  } 
} 

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