上一篇我们说了关于自定义软键盘实现的相关原理，把两个主要的类介绍了一下，并看了一下源码的内容，那么今天实现起来就不会有什么疑惑了，每一步都会清晰了。
好了，下面我们就把实现的具体步骤给大家介绍一下：首先在res下新建xml文件夹，在xml文件夹中新建symbols.xml文件，这个布局文件重要是实现软键盘的布局，每一个按键都有一个codes值，在类中就是通过codes值来监听每一个按钮，上一面已经说了，一些codes是固定，一些是自定义设置的，内如如下:
<?xml version="1.0" encoding="utf-8"?> <keyboard xmlns:android="http://schemas.android.com/apk/res/android" android:keywidth="33%p" android:horizontalgap="0px" android:verticalgap="0px" android:keyheight="10%p"> <row> <key android:codes="49" android:keylabel="1"> <key android:codes="50" android:keylabel="2"> <key android:codes="51" android:keylabel="3"> </key></key></key></row> <row> <key android:codes="52" android:keylabel="4"> <key android:codes="53" android:keylabel="5"> <key android:codes="54" android:keylabel="6"> </key></key></key></row> <row> <key android:codes="55" android:keylabel="7"> <key android:codes="56" android:keylabel="8"> <key android:codes="57" android:keylabel="9"> </key></key></key></row> <row> <key android:codes="4896" android:keylabel="清空"> <key android:codes="48" android:keylabel="0"> <key android:codes="-5" android:keyicon="@drawable/sym_keyboard_delete"> </key></key></key></row> </keyboard>然后创建一个类，用于处理软键盘事件，文件名为KeyboardUtil.java,内容如下：
package com.xinhui.ui; import com.xinhui.appsystem.R; import android.app.Activity; import android.content.Context; import android.inputmethodservice.Keyboard; import android.inputmethodservice.KeyboardView; import android.inputmethodservice.KeyboardView.OnKeyboardActionListener; import android.text.Editable; import android.view.View; import android.widget.EditText; public class KeyboardUtil { private KeyboardView keyboardView; private Keyboard k; private EditText ed; public KeyboardUtil(Activity act, Context ctx, EditText edit) { this.ed = edit; k = new Keyboard(ctx, R.xml.symbols); keyboardView = (KeyboardView) act.findViewById(R.id.keyboard_view); keyboardView.setKeyboard(k); keyboardView.setEnabled(true); keyboardView.setPreviewEnabled(true); keyboardView.setVisibility(View.VISIBLE); 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_DELETE) { if (editable != null && editable.length() > 0) { if (start > 0) { editable.delete(start - 1, start); } } }else if (primaryCode == 4896) { editable.clear(); } else { editable.insert(start, Character.toString((char) primaryCode)); } } }; public void showKeyboard() { int visibility = keyboardView.getVisibility(); if (visibility == View.GONE || visibility == View.INVISIBLE) { keyboardView.setVisibility(View.VISIBLE); } } }接下来就是实现activity的视图布局文件了，文件名为input_pwd.xml，内容如下：
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" android:background="@drawable/viewbackground" > <LinearLayout android:layout_width="match_parent" android:layout_height="40dip" android:gravity="center_vertical|center_horizontal" android:orientation="horizontal" > <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:textColor="@android:color/white" android:textSize="22sp" android:text="安全验证"/> </LinearLayout> <View android:layout_width="fill_parent" android:layout_height="1dip" android:background="#ff00ff66" /> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_marginTop="20dip" android:gravity="center_vertical|center_horizontal" android:orientation="horizontal"> <ImageView android:id="@+id/iv_lock_app_icon" android:layout_width="48dip" android:layout_height="48dip" android:contentDescription="@string/hello_world"/> <TextView android:id="@+id/tv_lock_app_name" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginLeft="15dip" android:textColor="#ffbc04e5" android:text="@string/hello_world"/> </LinearLayout> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_marginTop="20dip" android:orientation="horizontal" > <EditText android:id="@+id/et_lock_pwd" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginLeft="5dip" android:layout_marginRight="5dip" android:layout_marginTop="20dip" android:layout_weight="0.36" android:background="#cccccc" android:hint="输入密码" android:inputType="textPassword" android:textSize="40dp" /> <Button android:id="@+id/btn_confirm" android:layout_width="78dp" android:layout_height="wrap_content" android:layout_marginTop="20dip" android:text="确定" android:textSize="20dp" /> </LinearLayout> <android.inputmethodservice.KeyboardView android:id="@+id/keyboard_view" android:layout_width="fill_parent" android:layout_height="fill_parent" android:layout_marginTop="10dip" android:focusable="true" android:focusableInTouchMode="true" android:visibility="visible" /> </LinearLayout>最后就在你要执行activity，添加一些代码就行了，剩下的就和其他控件使用方式一样了，类名为LockAppActivity.java,内容如下：
package com.xinhui.ui; import com.xinhui.appsystem.R; import com.xinhui.service.WatchAppService; import android.app.Activity; import android.content.SharedPreferences; import android.content.pm.ApplicationInfo; import android.content.pm.PackageManager.NameNotFoundException; import android.graphics.drawable.Drawable; import android.os.Bundle; import android.text.InputType; import android.text.TextUtils; import android.util.Log; import android.view.KeyEvent; import android.view.MotionEvent; import android.view.View; import android.view.View.OnClickListener; import android.view.View.OnTouchListener; import android.view.Window; import android.widget.Button; import android.widget.EditText; import android.widget.ImageView; import android.widget.TextView; import android.widget.Toast; public class LockAppActivity extends Activity implements OnClickListener,OnTouchListener{ private ImageView ivLockAppIcon; private TextView tvLockAppName; private EditText etInputPwd; private Button btnConfirm; private String packageName; private String passWord; private SharedPreferences preferences; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); requestWindowFeature(Window.FEATURE_NO_TITLE); setContentView(R.layout.input_pwd); Log.e("test", "onCreate--->"); ivLockAppIcon = (ImageView) findViewById(R.id.iv_lock_app_icon); tvLockAppName = (TextView) findViewById(R.id.tv_lock_app_name); etInputPwd = (EditText) findViewById(R.id.et_lock_pwd); etInputPwd.setOnTouchListener(this); btnConfirm = (Button) findViewById(R.id.btn_confirm); btnConfirm.setOnClickListener(this); packageName = getIntent().getStringExtra("packageName"); try { ApplicationInfo appInfo = getPackageManager().getPackageInfo(packageName, 0).applicationInfo; Drawable app_icon = appInfo.loadIcon(getPackageManager()); String app_name = appInfo.loadLabel(getPackageManager()).toString(); ivLockAppIcon.setImageDrawable(app_icon); tvLockAppName.setText(app_name); } catch (NameNotFoundException e) { e.printStackTrace(); } } @Override public boolean onKeyDown(int keyCode, KeyEvent event) { if(KeyEvent.KEYCODE_BACK == event.getKeyCode()) { return true; } return super.onKeyDown(keyCode, event); } @Override public void onClick(View v) { String input = etInputPwd.getText().toString().trim(); preferences = getSharedPreferences("passWord", MODE_PRIVATE); passWord = preferences.getString("pwd", ""); if(TextUtils.isEmpty(input)) { Toast.makeText(this, "密码不能为空", Toast.LENGTH_SHORT).show(); } else if(passWord.equals(input)) { WatchAppService.lastRunningApp = WatchAppService.runningApp; finish(); } else { Toast.makeText(this, "密码错误", Toast.LENGTH_SHORT).show(); etInputPwd.setText(""); } } @Override public boolean onTouch(View v, MotionEvent event) { int inputback = etInputPwd.getInputType(); etInputPwd.setInputType(InputType.TYPE_NULL); new KeyboardUtil(this, this, etInputPwd).showKeyboard(); etInputPwd.setInputType(inputback); return false; } }由于我的这个activity是其他activity调用的，并不是主界面的activity。上面就把实现的整个过程写完了，一个自定义的数字软键盘就实现了。
