Android手势操作(一)

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elsemSaveButton.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<String> gesturyies = mGestureLibrary.getGestureEntries();// 删除已经存在的同名的手势if (gesturyies.contains(gestureName)) {ArrayList<Gesture> 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;}}}}

main.xml如下:

<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" >    <LinearLayout        android:id="@+id/linearLayout"        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:layout_alignParentTop="true"        android:orientation="horizontal" >        <TextView            android:id="@+id/textView"            android:layout_width="100dip"            android:layout_height="wrap_content"            android:text="手势的名称:" />        <EditText            android:id="@+id/editText"            android:layout_width="fill_parent"            android:layout_height="wrap_content"            android:hint="在此输入" />    </LinearLayout> <android.gesture.GestureOverlayView     android:id="@+id/gestureOverlayView"     android:layout_width="fill_parent"     android:layout_height="fill_parent"     android:layout_below="@id/linearLayout"     android:layout_marginBottom="50dip"     android:gestureStrokeType="multiple"  />  <LinearLayout        android:layout_width="fill_parent"        android:layout_height="50dip"        android:layout_alignParentBottom="true"        android:orientation="horizontal" >    <Button         android:id="@+id/saveButton"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_weight="1"         android:text="保存"        />     <Button         android:id="@+id/resetButton"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_weight="1"         android:text="重置"        />   </LinearLayout> </RelativeLayout>

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