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mainActivity如下:

package cn.c;import java.io.File;import java.util.ArrayList;import java.util.Set;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.gesture.GestureOverlayView.OnGesturePerformedListener;import android.gesture.Prediction;import android.os.Bundle;import android.os.Environment;import android.view.KeyEvent;import android.view.MotionEvent;import android.view.View;import android.view.View.OnClickListener;import android.view.View.OnKeyListener;import android.widget.Button;import android.widget.EditText;/** * 需求描述: * 向手势库中保存一个手势 * 错误总结: * 错误1: * 描述:在GestureOverlayView画一个手势后,该手势会 * 里面消失,不会停留显示在GestureOverlayView控件上 * 原因: * 没有在布局文件中为GestureOverlayView设置以下属性 * android:gestureStrokeType="multiple" * 错误2:对于手势库文件gestureLibraryFile和手势库mGestureLibrary * 的理解有些偏差了.片面的理解为:这是两个独立的东西或者说 * gestureLibraryFile中存放了一个mGestureLibrary * 应该这里理解: * mGestureLibrary就是一个文件! * 只是以前没有遇到这种文件,一时半会没有反应过来 */public class MainActivity extends Activity {    private EditText mEditText;    private GestureOverlayView mGestureOverlayView;    private GestureLibrary mGestureLibrary;    private Gesture mGesture;    private Button mSaveButton;    private Button mResetButton;    private String mGestureLibraryPath;    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);        init();    }	private void init() {		mEditText = (EditText) findViewById(R.id.editText);		mEditText.setOnKeyListener(new OnKeyListener() {			public boolean onKey(View v, int keyCode, KeyEvent event) {				if (mGesture!=null&&mEditText.getText().toString().length()>0) {					mSaveButton.setEnabled(true);				} else {					mSaveButton.setEnabled(false);				}				return false;			}		});		mGestureOverlayView = 		(GestureOverlayView) findViewById(R.id.gestureOverlayView);		mSaveButton = (Button) findViewById(R.id.saveButton);		mSaveButton.setOnClickListener(new ButtonOnClickListenerImpl());		mSaveButton.setEnabled(false);		mResetButton = (Button) findViewById(R.id.resetButton);		mResetButton.setOnClickListener(new ButtonOnClickListenerImpl());		//GestureLibrary文件的路径		mGestureLibraryPath =		Environment.getExternalStorageDirectory()+File.separator+"testgestures";		//为GestureOverlayView添加监听事件		mGestureOverlayView.addOnGestureListener(new GestureListenerImpl());	}	private class GestureListenerImpl implements OnGestureListener{		//开始绘制手势		public void onGestureStarted(GestureOverlayView overlay,MotionEvent event) {			mSaveButton.setEnabled(false);			mGesture=null;		}		public void onGesture(GestureOverlayView overlay, MotionEvent event) {		}        //手势绘制结束		public void onGestureEnded(GestureOverlayView overlay, MotionEvent event) {			mGesture=mGestureOverlayView.getGesture();			if (mGesture!=null&&mEditText.getText().toString().length()>0) {				mSaveButton.setEnabled(true);			}		}		public void onGestureCancelled(GestureOverlayView overlay,MotionEvent event) {		}			}		private class ButtonOnClickListenerImpl implements OnClickListener {		public void onClick(View v) {			switch (v.getId()) {			case R.id.resetButton:				mGestureOverlayView.clear(true);				mSaveButton.setEnabled(false);				mEditText.setText("");				break;			case R.id.saveButton:				String gestureName = mEditText.getText().toString();				try {					File gestureLibraryFile = new File(mGestureLibraryPath);					// 加载该路径下的手势库.					// 若不存在,则会在路径下创建一个手势库					mGestureLibrary = GestureLibraries.fromFile(mGestureLibraryPath);					if (!gestureLibraryFile.exists()) {						mGestureLibrary.addGesture(gestureName, mGesture);						if (mGestureLibrary.save()) {							//只有执行完mGestureLibrary.save()的时候							//gestureLibraryFile文件才不为空							//所以if只会执行一次,往后都执行else							mSaveButton.setEnabled(false);							mEditText.setText("");							mGestureOverlayView.clear(true);							System.out.println("xxxx0000 成功");						} else {							System.out.println("xxxx0000 失败");						}					} else {						if (!mGestureLibrary.load()) {							System.out.println("xxxx1111 加载手势库失败");						} else {							Set
   
     gesturyies = mGestureLibrary.getGestureEntries();							// 删除已经存在的同名的手势							if (gesturyies.contains(gestureName)) {								ArrayList
    
      list = mGestureLibrary.getGestures(gestureName);								for (int i = 0; i < list.size(); i++) {									mGestureLibrary.removeGesture(gestureName,list.get(i));								}							}							// 添加手势							mGestureLibrary.addGesture(gestureName, mGesture);							// 判断手势是否保存成功							if (mGestureLibrary.save()) {								mGestureOverlayView.clear(true);								mSaveButton.setEnabled(true);								mEditText.setText("");								System.out.println("xxxx1111 手势保存成功");							} else {								System.out.println("xxxx1111 手势保存失败");							}						}					}				} catch (Exception e) {				}				break;			default:				break;			}		}	}}
    
   

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