Android自定义软键盘的设计与实现代码
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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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