Android 高仿微信支付数字键盘功能

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 --><GridViewandroid: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" /><Viewandroid:id="@+id/line"android:layout_width="match_parent"android:layout_height="1px"android:layout_above="@id/gv_keybord"android:background="#bdbdbd" /><RelativeLayoutandroid:id="@+id/layoutBack"android:layout_width="match_parent"android:layout_height="wrap_content"android:layout_above="@id/line"android:background="#f5f5f5"android:padding="10dp"><ImageViewandroid:id="@+id/imgBack"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_centerInParent="true"android:src="@mipmap/keyboard_back_img" /></RelativeLayout><Viewandroid: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);}@Overridepublic 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;}@Overridepublic int getCount() {return valueList.size();}@Overridepublic Object getItem(int position) {return valueList.get(position);}@Overridepublic long getItemId(int position) {return position;}@Overridepublic 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"><TextViewandroid: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" /><RelativeLayoutandroid:id="@+id/imgDelete"android:layout_width="wrap_content"android:layout_height="60dp"android:layout_centerInParent="true"><ImageViewandroid: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"><EditTextandroid: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.VirtualKeyboardViewandroid: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;@Overrideprotected 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() {@Overridepublic void onClick(View v) {virtualKeyboardView.startAnimation(exitAnim);virtualKeyboardView.setVisibility(View.GONE);}});gridView = virtualKeyboardView.getGridView();gridView.setOnItemClickListener(onItemClickListener);textAmount.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {virtualKeyboardView.setFocusable(true);virtualKeyboardView.setFocusableInTouchMode(true);virtualKeyboardView.startAnimation(enterAnim);virtualKeyboardView.setVisibility(View.VISIBLE);}});}private AdapterView.OnItemClickListener onItemClickListener = new AdapterView.OnItemClickListener() {@Overridepublic 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());}}}}};}

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