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自SDK 1.6开始，Android手机已支持内置Gesture Builder程序，若是被Google签署（Signed）过出厂的手机应会内置此程序.
Gesture Builder提供了一手写识别的功能，让用户以类似于涂鸦的方式绘制一个手写符号，使之对应一个字符串名称，然而GestureBuilder功能虽完整，但在手写字符串的创建上却有些限制，如：制式化的建立方式、无法自行配置涂鸦区、查看手写（Gesture）以ListView来呈现等，在实际开发上稍显“复杂”了些。
下面看一下配置UI界面的activity_gesture_builder_demo.xml文件：
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="fill_parent" android:layout_height="fill_parent" android:background="@drawable/white" > <LinearLayout android:id="@+id/linear_top_id" android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_alignParentTop="true" android:weightSum="2" android:orientation="horizontal" > <TextView android:id="@+id/text_id" android:layout_width="wrap_content" android:layout_height="wrap_content" android:padding="@dimen/padding_medium" android:text="@string/hello_world" android:textSize="18sp" tools:context=".GestureBuilderDemo" /> <EditText android:id="@+id/edit_id" android:layout_width="fill_parent" android:layout_height="wrap_content" android:inputType="text" /> </LinearLayout> <android.gesture.GestureOverlayView android:id="@+id/myGestures1" android:layout_width="fill_parent" android:layout_height="300dip" android:layout_below="@+id/linear_top_id" android:layout_marginRight="30sp" android:gestureColor="#8909" android:gestureStrokeType="multiple" /><!-- android:gestureStrokeType="multiple" 表示多笔支持，single则支持单一笔画 --> <SlidingDrawer android:id="@+id/slidingDreaer" android:layout_width="wrap_content" android:layout_height="wrap_content" android:content="@+id/content" android:handle="@+id/handler" android:orientation="horizontal" > <ImageView android:id="@+id/handler" android:layout_width="wrap_content" android:layout_height="wrap_content" android:contentDescription="@string/app_name" android:src="@drawable/open" /> <ListView android:id="@+id/content" android:layout_width="fill_parent" android:layout_height="wrap_content" android:choiceMode="singleChoice" android:background="@drawable/back" android:divider="@drawable/divider" > </ListView> </SlidingDrawer> <LinearLayout android:id="@+id/linear_botton_id" android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_alignParentBottom="true" android:weightSum="2" style="@android:style/ButtonBar" android:orientation="horizontal" > <Button android:id="@+id/button1_id" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_weight="1.0" android:text="@string/str_button1" /> <Button android:id="@+id/button2_id" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_weight="1.0" android:text="@string/str_button2" /> </LinearLayout></RelativeLayout>
其中有一个TAG为<android.gesture. GestureOverlayView>的Widget，可称为“手写绘图区”，当中有两项较重要的属性，分别为android:layout_width设置为“fill_parent”以及android:gestureStrokeType设置为“multiple”，这表示为支持多笔画，若设置为“single”则仅支持单一笔画。
AndroidManifest.xml：
<manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.example.gesturebuilderdemo" android:versionCode="1" android:versionName="1.0" android:installLocation="preferExternal" > <uses-sdk android:minSdkVersion="8" android:targetSdkVersion="15" /><uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/> <application android:icon="@drawable/ic_launcher" android:label="@string/app_name" android:theme="@style/AppTheme" > <activity android:name=".GestureBuilderDemo" android:label="@string/title_activity_gesture_builder_demo" > <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> </application></manifest>
由于Gesture手写Libary文件"/sdcard/gestures"默认保存在SD存储卡中，所以需要写入External Storage的权限。
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
再看java文件中看几个函数：
Gesture对象是自GestureOverlayView.getGesture() 所取得的手写对象；GestureLibraries为保存手写背后所包含的意义（String），本范例利用GestureLibraries.fromFile()方法来加载预设的Gesture文件，倘若默认手机的SD存储卡中尚未创建Gesture手写数据文件，此程序也会处理创建新文件的工作。此外，程序中举例应用了GestureLibraries.addGesture()新建手写数据、GestureLibraries.save()保存写入手写数据GestureLibraries.load()加载手写数据、GestureLibraries. removeGesture()删除手写数据等方法。
GestureBuilderDemo.java
package com.example.gesturebuilderdemo;import java.io.File;import java.util.ArrayList;import java.util.List;import java.util.Set;import android.os.Bundle;import android.os.Environment;import android.app.Activity;import android.gesture.Gesture;import android.gesture.GestureLibraries;import android.gesture.GestureLibrary;import android.gesture.GestureOverlayView;import android.gesture.GestureOverlayView.OnGestureListener;import android.graphics.Bitmap;import android.graphics.Color;import android.util.Log;import android.view.KeyEvent;import android.view.Menu;import android.view.MotionEvent;import android.view.View;import android.view.View.OnClickListener;import android.view.View.OnKeyListener;import android.widget.AdapterView;import android.widget.AdapterView.OnItemClickListener;import android.widget.Button;import android.widget.EditText;import android.widget.ImageView;import android.widget.LinearLayout;import android.widget.ListView;import android.widget.SlidingDrawer;import android.widget.SlidingDrawer.OnDrawerCloseListener;import android.widget.SlidingDrawer.OnDrawerOpenListener;import android.widget.Toast;public class GestureBuilderDemo extends Activity { private static final String TAG="GestureBuilderDemo"; private Button mButton1, mButton2; private GestureOverlayView mGestureOverlayView;//手写绘制区 private EditText mEditText; private Gesture ges; private GestureLibrary lib; private String gesPath; // ---------------------------- private ImageView mImageView;//拉动式抽屉 private SlidingDrawer mDrawer;//拉动式抽屉的手柄 private ListView mListView;//拉动式抽屉的内容 private List<String> gesNames = new ArrayList<String>();//保存手写的名称集合 private List<Bitmap> gesPics = new ArrayList<Bitmap>();//保存转换为手写的图片的集合 //------------------- ------- private LinearLayout layout_bottom;//底部的2个按钮布局 private LinearLayout layout_top;//顶部的2个按钮布局 private MyListAdapter adapter;//适配器 @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); /* 查看SDCard是否存在 */ setContentView(R.layout.activity_gesture_builder_demo); if (!Environment.MEDIA_MOUNTED.equals(Environment .getExternalStorageState())) { Toast.makeText(this, "SDCard不存在！", Toast.LENGTH_SHORT).show(); this.finish(); } /* 取得系统默认的GestureLibrary的文件路径 */ gesPath = new File(Environment.getExternalStorageDirectory(), "gestures").getAbsolutePath(); mButton1 = (Button) this.findViewById(R.id.button1_id); mButton2 = (Button) this.findViewById(R.id.button2_id); mGestureOverlayView = (GestureOverlayView) this .findViewById(R.id.myGestures1); mEditText = (EditText) this.findViewById(R.id.edit_id); mButton1.setEnabled(false); mImageView = (ImageView) this.findViewById(R.id.handler); mDrawer = (SlidingDrawer) this.findViewById(R.id.slidingDreaer); mListView = (ListView) this.findViewById(R.id.content); mEditText.setOnKeyListener(keyListener); mGestureOverlayView.addOnGestureListener(onGestureListener); mButton1.setOnClickListener(listener1); mButton2.setOnClickListener(listener2); layout_bottom=(LinearLayout)this.findViewById(R.id.linear_botton_id); layout_top=(LinearLayout)this.findViewById(R.id.linear_top_id); adapter=new MyListAdapter(this,gesNames,gesPics); getExitGesture();//读取SD卡中的/sdcard/gestures里建立的手写，并显示在ListView中 mListView.setAdapter(adapter); mListView.setOnItemClickListener(list_listener); mDrawer.setOnDrawerOpenListener(onDrawerOpenListener_open); mDrawer.setOnDrawerCloseListener(onDrawerCloseListener_close); } OnItemClickListener list_listener=new OnItemClickListener(){ public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) { // TODO Auto-generated method stub Toast.makeText(GestureBuilderDemo.this, "GestureName:"+gesNames.get(arg2), Toast.LENGTH_SHORT).show(); } }; //抽屉打开 OnDrawerOpenListener onDrawerOpenListener_open=new OnDrawerOpenListener(){ public void onDrawerOpened() { // TODO Auto-generated method stub mImageView.setImageResource(R.drawable.close); layout_bottom.setVisibility(View.GONE); layout_top.setVisibility(View.GONE); mGestureOverlayView.setVisibility(View.GONE); getExitGesture(); } }; //抽屉关闭 OnDrawerCloseListener onDrawerCloseListener_close=new OnDrawerCloseListener(){ public void onDrawerClosed() { // TODO Auto-generated method stub mImageView.setImageResource(R.drawable.open); layout_bottom.setVisibility(View.VISIBLE); layout_top.setVisibility(View.VISIBLE); mGestureOverlayView.setVisibility(View.VISIBLE); } }; //读取SD卡中的/sdcard/gestures里建立的手写，并显示在ListView中 public void getExitGesture() { Log.i(TAG, "getExitGesture()"); gesNames.clear(); gesPics.clear(); File f = new File(gesPath); lib = GestureLibraries.fromFile(f); if (f.exists()) { if (!lib.load()) { Toast.makeText(GestureBuilderDemo.this, "加载失败！！", Toast.LENGTH_SHORT).show(); } else { Object[] obj = lib.getGestureEntries().toArray(); for (int i = 0; i < obj.length; i++) { ArrayList<Gesture> al = lib.getGestures(obj[i].toString()); // Log.i(TAG, "i="+i); for (int j = 0; j < al.size(); j++) { // Log.i(TAG, "j="+j); // Log.i(TAG, "obj[i].toString()==="+obj[i].toString()); // 手写名称 gesNames.add(obj[i].toString()); Gesture gs = (Gesture) al.get(j); //将手写转成Bitmap图片 gesPics.add(gs.toBitmap(50, 50, 12, Color.MAGENTA)); } } } } else { Toast.makeText(GestureBuilderDemo.this, "文件不存在！", Toast.LENGTH_SHORT).show(); } adapter.notifyDataSetChanged(); } OnGestureListener onGestureListener = new OnGestureListener() { public void onGesture(GestureOverlayView overlay, MotionEvent event) { // TODO Auto-generated method stub } public void onGestureCancelled(GestureOverlayView overlay, MotionEvent event) { // TODO Auto-generated method stub } public void onGestureEnded(GestureOverlayView overlay, MotionEvent event) { // TODO Auto-generated method stub ges = overlay.getGesture(); if (ges != null && mEditText.getText().toString().trim().length() != 0) { mButton1.setEnabled(true); } } public void onGestureStarted(GestureOverlayView overlay, MotionEvent event) { // TODO Auto-generated method stub ges = null; mButton1.setEnabled(false); } }; OnKeyListener keyListener = new OnKeyListener() { public boolean onKey(View arg0, int arg1, KeyEvent arg2) { // TODO Auto-generated method stub if (ges != null && mEditText.getText().toString().trim().length() != 0) { mButton1.setEnabled(true); } else { mButton1.setEnabled(false); } return false; } }; @Override public boolean onCreateOptionsMenu(Menu menu) { getMenuInflater().inflate(R.menu.activity_gesture_builder_demo, menu); return true; } OnClickListener listener1 = new OnClickListener() { public void onClick(View arg0) { // TODO Auto-generated method stub String gestureName = mEditText.getText().toString().trim(); lib = GestureLibraries.fromFile(gesPath); File f = new File(gesPath); if (!f.exists()) { /* 文件不存在就直接写入 */ lib.addGesture(gestureName, ges); if (lib.save()) { mEditText.setText(""); mGestureOverlayView.clear(true); mButton1.setEnabled(false); Toast.makeText(GestureBuilderDemo.this, "保存成功，路径为：" + gesPath, Toast.LENGTH_SHORT).show(); } else { Toast.makeText(GestureBuilderDemo.this, "保存失败！", Toast.LENGTH_SHORT).show(); } } else { // 文件存在时，先读取已经存在的Gesture if (lib.load()) { /* 如果Library中存在相同名称，则先将其移除再写入 */ Set<String> set = lib.getGestureEntries(); if (set.contains(gestureName)) { ArrayList<Gesture> list = lib.getGestures(gestureName); for (int i = 0; i < list.size(); i++) { //删除手写数据 lib.removeGesture(gestureName, list.get(i)); } } //新增手写数据 lib.addGesture(gestureName, ges); // 保存写入手写数据 if (lib.save()) { mEditText.setText(""); mGestureOverlayView.clear(true); mButton1.setEnabled(false); Toast.makeText(GestureBuilderDemo.this, "保存成功，路径为：" + gesPath, Toast.LENGTH_SHORT) .show(); } else { Toast.makeText(GestureBuilderDemo.this, "保存失败！", Toast.LENGTH_SHORT).show(); } } else { Toast.makeText(GestureBuilderDemo.this, "加载失败！", Toast.LENGTH_SHORT).show(); } } mDrawer.toggle(); } }; OnClickListener listener2 = new OnClickListener() { public void onClick(View arg0) { // TODO Auto-generated method stub mEditText.setText(""); mGestureOverlayView.clear(true); mButton1.setEnabled(false); } };}
ListView的适配器文件：
package com.example.gesturebuilderdemo;import java.util.List;import android.content.Context;import android.graphics.Bitmap;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.BaseAdapter;import android.widget.ImageView;import android.widget.TextView;public class MyListAdapter extends BaseAdapter { private Context mContext; private List<String> gesNames ; private List<Bitmap> gesPics ; public MyListAdapter(Context mContext,List<String> gesNames,List<Bitmap> gesPics ) { this.mContext=mContext; this.gesNames=gesNames; this.gesPics=gesPics; } public int getCount() { // TODO Auto-generated method stub return gesNames.size(); } public Object getItem(int arg0) { // TODO Auto-generated method stub return gesNames.get(arg0); } public long getItemId(int position) { // TODO Auto-generated method stub return position; } public View getView(int position, View convertView, ViewGroup parent) { // TODO Auto-generated method stub convertView= LayoutInflater.from(mContext).inflate(R.layout.list, null); ImageView img=(ImageView)convertView.findViewById(R.id.img_id); img.setImageBitmap(gesPics.get(position)); TextView text=(TextView)convertView.findViewById(R.id.text_id); text.setText(gesNames.get(position)); return convertView; }}
ListView的布局配置文件：
<?xml version="1.0" encoding="UTF-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" > <ImageView android:id="@+id/img_id" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentLeft="true" android:contentDescription="@string/app_name" /> <TextView android:id="@+id/text_id" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_toRightOf="@+id/img_id" android:lines="1" android:textColor="#f699" android:textSize="20sp" android:textStyle="bold" /></RelativeLayout>
文件中有详细说明，不多说了。
当建立完手写和输入名称后自动把添加按钮Enable，所用的监听器为： mEditText.setOnKeyListener(keyListener);
点击添加按钮后悔自动打开抽屉获取以ListView显示在抽屉中。
界面如下所示：
