Jamendo开源在线音乐播放器里面com.teleca.jamendo.gestures下面的是相关代码。
但是需要先使用android的Demo代码创建手势文件。
然后读取手势文件并进行相关操作。

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。

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);}
};
}

@blog.csdn.net/ta893115871/article/details/7822816
这个讲的比较详细，有时间再看，，，