Android(安卓)建立自己的手写笔画图案 Gesture Builder

/****************************************************

大家都知道写博客会很累的，大热天的。

希望=转载请注明出处：http://blog.csdn.net/ta893115871

请不要可怜你的鼠标，(*^__^*) 嘻嘻……

***************************************************/

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@Overridepublic 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 stubToast.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 stubmImageView.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 stubmImageView.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 stubges = 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 stubges = null;mButton1.setEnabled(false);}};OnKeyListener keyListener = new OnKeyListener() {public boolean onKey(View arg0, int arg1, KeyEvent arg2) {// TODO Auto-generated method stubif (ges != null&& mEditText.getText().toString().trim().length() != 0) {mButton1.setEnabled(true);} else {mButton1.setEnabled(false);}return false;}};@Overridepublic 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 stubString 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Gestureif (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 stubmEditText.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 stubreturn gesNames.size();}public Object getItem(int arg0) {// TODO Auto-generated method stubreturn gesNames.get(arg0);}public long getItemId(int position) {// TODO Auto-generated method stubreturn position;}public View getView(int position, View convertView, ViewGroup parent) {// TODO Auto-generated method stubconvertView=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：

更多相关文章

随机推荐