现在很多app的支付、输入密码功能，都已经开始使用自定义数字键盘，不仅更加方便、其效果着实精致。

下面带着大家学习下，如何高仿微信的数字键盘，可以拿来直接用在自身的项目中。

先看下效果图：

1. 自定义布局

<?xml version="1.0" encoding="utf-8"?>

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="match_parent"

    android:layout_height="wrap_content">

    <!-- 输入键盘 -->

    <GridView

        android:id="@+id/gv_keybord"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:layout_alignParentBottom="true"

        android:background="#bdbdbd"

        android:horizontalSpacing="1px"

        android:numColumns="3"

        android:verticalSpacing="1px" />

    <View

        android:id="@+id/line"

        android:layout_width="match_parent"

        android:layout_height="1px"

        android:layout_above="@id/gv_keybord"

        android:background="#bdbdbd" />

    <RelativeLayout

        android:id="@+id/layoutBack"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:layout_above="@id/line"

        android:background="#f5f5f5"

        android:padding="10dp">

        <ImageView

            android:id="@+id/imgBack"

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:layout_centerInParent="true"

            android:src="@mipmap/keyboard_back_img" />

    </RelativeLayout>

    <View

        android:layout_width="match_parent"

        android:layout_height="1px"

        android:layout_above="@id/layoutBack"

        android:layout_marginTop="1dp"

        android:background="#bdbdbd" />

</RelativeLayout>

键盘的布局，实质就是一个4X3网格布局的GridView。

2.实现数字键盘内容

import android.content.Context;

import android.util.AttributeSet;

import android.view.View;

import android.widget.GridView;

import android.widget.RelativeLayout;

import com.lnyp.pswkeyboard.R;

import com.lnyp.pswkeyboard.adapter.KeyBoardAdapter;

import java.util.ArrayList;

import java.util.HashMap;

import java.util.Map;

/**

 * 虚拟键盘

 */

public class VirtualKeyboardView extends RelativeLayout implements View.OnClickListener {

    Context context;

    private GridView gridView;    

    private RelativeLayout layoutBack;

    private ArrayList<Map<String, String>> valueList;   

    public VirtualKeyboardView(Context context) {

        this(context, null);

    }

    public VirtualKeyboardView(Context context, AttributeSet attrs) {

        super(context, attrs);

        this.context = context;

        View view = View.inflate(context, R.layout.layout_virtual_keyboard, null);

        valueList = new ArrayList<>();

        layoutBack = (RelativeLayout) view.findViewById(R.id.layoutBack);

        layoutBack.setOnClickListener(this);

        gridView = (GridView) view.findViewById(R.id.gv_keybord);

        setView();

        addView(view);

    }

    public RelativeLayout getLayoutBack() {

        return layoutBack;

    }

    public ArrayList<Map<String, String>> getValueList() {

        return valueList;

    }

    public GridView getGridView() {

        return gridView;

    }

    private void setView() {

        /* 初始化按钮上应该显示的数字 */

        for (int i = 1; i < 13; i++) {

            Map<String, String> map = new HashMap<String, String>();

            if (i < 10) {

                map.put("name", String.valueOf(i));

            } else if (i == 10) {

                map.put("name", ".");

            } else if (i == 11) {

                map.put("name", String.valueOf(0));

            } else if (i == 12) {

                map.put("name", "");

            }

            valueList.add(map);

        }

        KeyBoardAdapter keyBoardAdapter = new KeyBoardAdapter(context, valueList);

        gridView.setAdapter(keyBoardAdapter);

    }

    @Override

    public void onClick(View v) {

    }

}

看下适配器如何处理：KeyBoardAdapter .java

import android.content.Context;

import android.graphics.Color;

import android.view.View;

import android.view.ViewGroup;

import android.widget.BaseAdapter;

import android.widget.RelativeLayout;

import android.widget.TextView;

import com.lnyp.pswkeyboard.R;

import java.util.ArrayList;

import java.util.Map;

/**

 * 九宫格键盘适配器

 */

public class KeyBoardAdapter extends BaseAdapter {

    private Context mContext;

    private ArrayList<Map<String, String>> valueList;

    public KeyBoardAdapter(Context mContext, ArrayList<Map<String, String>> valueList) {

        this.mContext = mContext;

        this.valueList = valueList;

    }

    @Override

    public int getCount() {

        return valueList.size();

    }

    @Override

    public Object getItem(int position) {

        return valueList.get(position);

    }

    @Override

    public long getItemId(int position) {

        return position;

    }

    @Override

    public View getView(int position, View convertView, ViewGroup parent) {

        ViewHolder viewHolder;

        if (convertView == null) {

            convertView = View.inflate(mContext, R.layout.grid_item_virtual_keyboard, null);

            viewHolder = new ViewHolder();

            viewHolder.btnKey = (TextView) convertView.findViewById(R.id.btn_keys);

            viewHolder.imgDelete = (RelativeLayout) convertView.findViewById(R.id.imgDelete);

            convertView.setTag(viewHolder);

        } else {

            viewHolder = (ViewHolder) convertView.getTag();

        }

        if (position == 9) {

            viewHolder.imgDelete.setVisibility(View.INVISIBLE);

            viewHolder.btnKey.setVisibility(View.VISIBLE);

            viewHolder.btnKey.setText(valueList.get(position).get("name"));

            viewHolder.btnKey.setBackgroundColor(Color.parseColor("#e0e0e0"));

        } else if (position == 11) {

            viewHolder.btnKey.setBackgroundResource(R.mipmap.keyboard_delete_img);

            viewHolder.imgDelete.setVisibility(View.VISIBLE);

            viewHolder.btnKey.setVisibility(View.INVISIBLE);

        } else {

            viewHolder.imgDelete.setVisibility(View.INVISIBLE);

            viewHolder.btnKey.setVisibility(View.VISIBLE);

            viewHolder.btnKey.setText(valueList.get(position).get("name"));

        }

        return convertView;

    }

    /**

     * 存放控件

     */

    public final class ViewHolder {

        public TextView btnKey;

        public RelativeLayout imgDelete;

    }

}

在看Adapter之前，我们先看下grid_item_virtual_keyboard是如何实现的：

<?xml version="1.0" encoding="utf-8"?>

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:background="#e0e0e0">

    <TextView

        android:id="@+id/btn_keys"

        android:layout_width="match_parent"

        android:layout_height="60dp"

        android:layout_centerInParent="true"

        android:background="@drawable/selector_gird_item"

        android:gravity="center"

        android:includeFontPadding="false"

        android:textColor="#333333"

        android:textSize="26sp" />

    <RelativeLayout

        android:id="@+id/imgDelete"

        android:layout_width="wrap_content"

        android:layout_height="60dp"

        android:layout_centerInParent="true">

        <ImageView

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:layout_centerInParent="true"

            android:src="@mipmap/keyboard_delete_img" />

    </RelativeLayout>

</RelativeLayout>

可以看到，我们在item布局文件中，指定了两个view，一个是普通显示数字的TextView， 一个是显示最后删除键的RelativeLayout。

然后，在KeyBoardAdapter 的getView方法中，我们根据position位置，对布局进行不同的处理。当position为9，也就是倒数第三个按键，它的按钮颜色要单独设置。 当position为12也就是最后一个按钮时，需要控制删除按钮显示，数字按钮隐藏。 其余情况则是删除按钮隐藏，数字按钮显示。

3.使用并实现键盘事件逻辑

布局中，可以直接使用自己定义的数字键盘：

<?xml version="1.0" encoding="utf-8"?>

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:tools="http://schemas.android.com/tools"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:background="#efefef"

    tools:context="com.lnyp.pswkeyboard.NormalKeyBoardActivity">

    <EditText

        android:id="@+id/textAmount"

        android:layout_width="match_parent"

        android:layout_height="50dp"

        android:background="#FFFFFF"

        android:inputType="numberDecimal"

        android:padding="14dp"

        android:textColor="#333333"

        android:textSize="16sp" />

    <com.lnyp.pswkeyboard.widget.VirtualKeyboardView

        android:id="@+id/virtualKeyboardView"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:layout_gravity="bottom" />

</RelativeLayout>

我们在Activity中，操作数字键盘：

import android.os.Bundle;

import android.support.v7.app.AppCompatActivity;

import android.text.Editable;

import android.view.View;

import android.view.animation.Animation;

import android.view.animation.AnimationUtils;

import android.widget.AdapterView;

import android.widget.EditText;

import android.widget.GridView;

import com.lnyp.pswkeyboard.widget.VirtualKeyboardView;

import java.util.ArrayList;

import java.util.Map;

public class NormalKeyBoardActivity extends AppCompatActivity {

    private VirtualKeyboardView virtualKeyboardView;

    private GridView gridView;

    private ArrayList<Map<String, String>> valueList;

    private EditText textAmount;

    private Animation enterAnim;

    private Animation exitAnim;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_normal_key_board);

        valueList = virtualKeyboardView.getValueList();

        initAnim();

        initView();

    }

    private void initAnim() {

        enterAnim = AnimationUtils.loadAnimation(this, R.anim.push_bottom_in);

        exitAnim = AnimationUtils.loadAnimation(this, R.anim.push_bottom_out);

    }

    private void initView() {

        virtualKeyboardView = (VirtualKeyboardView) findViewById(R.id.virtualKeyboardView);

        textAmount = (EditText) findViewById(R.id.textAmount);

        virtualKeyboardView.getLayoutBack().setOnClickListener(new View.OnClickListener() {

            @Override

            public void onClick(View v) {

                virtualKeyboardView.startAnimation(exitAnim);

                virtualKeyboardView.setVisibility(View.GONE);

            }

        });

        gridView = virtualKeyboardView.getGridView();

        gridView.setOnItemClickListener(onItemClickListener);

        textAmount.setOnClickListener(new View.OnClickListener() {

            @Override

            public void onClick(View v) {

                virtualKeyboardView.setFocusable(true);

                virtualKeyboardView.setFocusableInTouchMode(true);

                virtualKeyboardView.startAnimation(enterAnim);

                virtualKeyboardView.setVisibility(View.VISIBLE);

            }

        });

    }

    private AdapterView.OnItemClickListener onItemClickListener = new AdapterView.OnItemClickListener() {

        @Override

        public void onItemClick(AdapterView<?> adapterView, View view, int position, long l) {

            if (position < 11 && position != 9) {    //点击0~9按钮

                String amount = textAmount.getText().toString().trim();

                amount = amount + valueList.get(position).get("name");

                textAmount.setText(amount);

                Editable ea = textAmount.getText();

                textAmount.setSelection(ea.length());

            } else {

                if (position == 9) {      //点击退格键

                    String amount = textAmount.getText().toString().trim();

                    if (!amount.contains(".")) {

                        amount = amount + valueList.get(position).get("name");

                        textAmount.setText(amount);

                        Editable ea = textAmount.getText();

                        textAmount.setSelection(ea.length());

                    }

                }

                if (position == 11) {      //点击退格键

                    String amount = textAmount.getText().toString().trim();

                    if (amount.length() > 0) {

                        amount = amount.substring(0, amount.length() - 1);

                        textAmount.setText(amount);

                        Editable ea = textAmount.getText();

                        textAmount.setSelection(ea.length());

                    }

                }

            }

        }

    };

}

好了，通过以上步骤，我们便可以实现微信支付键盘啦，是不是很easy呢？！

如有疑问或建议，欢迎进QQ群来讨论交流：487786925（ Android研发村 ）

源码地址：https://github.com/zuiwuyuan/WeChatPswKeyboard

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