android中手势识别的实现

第一步：建立手势库

使用SDK自带例子GestureBuilder建立手势库（位置：android-sdk-windows\samples\android-8\GestureBuilder）。使用GestureBuilder之前，你需要恢复其到开发环境，然后进行编绎并部署到手机上。此时，就可以使用GestureBuilder建立手势库，生成的手势库文件在SCDard上，默认文件名称为：gestures

第二步：在应用中加载手势库文件，然后开发手势识别代码。

把手势库文件gestures文件拷贝到项目的res/raw目录下。然后在布局文件中添加用于手势绘制的View：

android:id="@+id/gestures"

android:layout_width="fill_parent“ android:layout_height="0dip"

android:layout_weight="1.0" />

为View添加手势监听事件：gestureOverlayView.addOnGesturePerformedListener();

得到手势库：mLibrary = GestureLibraries.fromRawResource(this, R.raw.gestures);

加载手势库：mLibrary.load();

List predictions = mLibrary.recognize(gesture);//从手势库中查询匹配的内容，匹配的结果可能包括多个相似的内容，匹配度高的结果放在最前面

大多数情况下，手势都是通过一笔完成。然而有一些特别的需求就需要通过多个笔画来实现，这时可以使用gestureStrokeType属性进行设置：android:gestureStrokeType="multiple"

String文件：

xml version="1.0" encoding="utf-8"?>
<resources>

 <string name="app_name">GestureTeststring>
 <string name="notrecognize">不能识别该手势string>
 <string name="noprediction">手势识别率太低，请重新输入string>

resources>

GestureTest 不能识别该手势 手势识别率太低，请重新输入

布局文件：

xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:layout_width="fill_parent"
 android:layout_height="fill_parent"
 android:orientation="vertical" >

 <android.gesture.GestureOverlayView
 android:id="@+id/myGestureView"
 android:layout_width="fill_parent"
 android:layout_height="0dip"
 android:layout_weight="1.0"
 />

LinearLayout>

Java文件：

package cn.class3g.gesture;

import java.util.ArrayList;

import android.app.Activity;
import android.content.Intent;
import android.gesture.Gesture;
import android.gesture.GestureLibraries;
import android.gesture.GestureLibrary;
import android.gesture.GestureOverlayView;
import android.gesture.GestureOverlayView.OnGesturePerformedListener;
import android.gesture.Prediction;
import android.net.Uri;
import android.os.Bundle;
import android.util.Log;
import android.widget.Toast;

public class GestureTestActivity extends Activity {

 GestureOverlayView getstureView;
 GestureLibrary gLibrary;
 boolean loadState = true;

 public void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.main);

 init();

 }

 private void init() {
 getstureView = (GestureOverlayView)  this
 .findViewById(R.id.myGestureView);
 getstureView
 .addOnGesturePerformedListener(new MyOnGesturePerformedListener());

 // 创建手势库对象GestureLibrary
 gLibrary = GestureLibraries.fromRawResource(this, R.raw.gestures);
 // 加载手势库资源
 loadState = gLibrary.load();

 }

 private final class MyOnGesturePerformedListener  implements
 OnGesturePerformedListener {

 public void onGesturePerformed(GestureOverlayView overlay,
 Gesture gesture) {
 if (loadState) {
 ArrayList predictions = gLibrary.recognize(gesture);

 if (!predictions.isEmpty()) {
 Prediction prediction = predictions.get(0);

 Log.i("TAG", String.valueOf(prediction.score));

 if (prediction.score > 5) {//如果是1的话太容易失败，本人测试5比较合适
 if ("close".equals(prediction.name)) {
 finish();//实现关闭功能，用的是activity自带的
 } else if ("dialto".equals(prediction.name)) {
 //实现播出固定电话的功能，记得添加权限
 Intent intent =  new Intent(Intent.ACTION_CALL,
 Uri.parse("tel:13333333333"));
  startActivity(intent);
 }
 }

 } else {
 showToast(R.string.notrecognize);
 }

 } else {
 showToast(R.string.noprediction);
 }

 }

 }

 private void showToast(int resId) {
 Toast.makeText(this, resId, Toast.LENGTH_LONG).show();
 }
}

package cn.class3g.gesture; import java.util.ArrayList; import android.app.Activity; import android.content.Intent; import android.gesture.Gesture; import android.gesture.GestureLibraries; import android.gesture.GestureLibrary; import android.gesture.GestureOverlayView; import android.gesture.GestureOverlayView.OnGesturePerformedListener; import android.gesture.Prediction; import android.net.Uri; import android.os.Bundle; import android.util.Log; import android.widget.Toast; public class GestureTestActivity extends Activity { GestureOverlayView getstureView; GestureLibrary gLibrary; boolean loadState = true; public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); init(); } private void init() { getstureView = (GestureOverlayView) this .findViewById(R.id.myGestureView); getstureView .addOnGesturePerformedListener(new MyOnGesturePerformedListener()); // 创建手势库对象GestureLibrary gLibrary = GestureLibraries.fromRawResource(this, R.raw.gestures); // 加载手势库资源 loadState = gLibrary.load(); } private final class MyOnGesturePerformedListener implements OnGesturePerformedListener { public void onGesturePerformed(GestureOverlayView overlay, Gesture gesture) { if (loadState) { ArrayList predictions = gLibrary.recognize(gesture); if (!predictions.isEmpty()) { Prediction prediction = predictions.get(0); Log.i("TAG", String.valueOf(prediction.score)); if (prediction.score > 5) {//如果是1的话太容易失败，本人测试5比较合适 if ("close".equals(prediction.name)) { finish();//实现关闭功能，用的是activity自带的 } else if ("dialto".equals(prediction.name)) { //实现播出固定电话的功能，记得添加权限 Intent intent = new Intent(Intent.ACTION_CALL, Uri.parse("tel:13333333333")); startActivity(intent); } } } else { showToast(R.string.notrecognize); } } else { showToast(R.string.noprediction); } } } private void showToast(int resId) { Toast.makeText(this, resId, Toast.LENGTH_LONG).show(); } }