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.gesture.GestureOverlayView

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<Prediction> 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">GestureTest</string>
 <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>

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

    <string name="app_name">GestureTest</string>
	<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>

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>

<?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<Prediction> 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:[phone]"));
 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<Prediction> 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:[phone]"));
							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();
	}
}