Android学习笔记_28_手势识别

一、准备手势库：

　　使用SDK自带例子GestureBuilder建立手势库（位置：android-sdk-windows\samples\android-10\GestureBuilder）。使用GestureBuilder之前，你需要恢复其到开发环境，将其他正确项目下的".classpath",".project"和"project.properties"三个文件拷贝到GestureBuilder项目下，导入到开发环境，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。

二、开发：

　　1、配置文件：

　　在配置文件中加入拨打电话权限，后面用到打电话。

<!-- 拨打电话  -->

    <uses-permission android:name="android.permission.CALL_PHONE"/>

　　布局文件：

<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"

    android:paddingBottom="@dimen/activity_vertical_margin"

    android:paddingLeft="@dimen/activity_horizontal_margin"

    android:paddingRight="@dimen/activity_horizontal_margin"

    android:paddingTop="@dimen/activity_vertical_margin"

    tools:context=".MainActivity" >



    <!--

        gestureStrokeType:可以设置单笔识别或多笔识别

        layout_weight:优先级别默认为0，最高为0，次之1...。显示界面时，先测量按钮的高度，然后再用窗口高度减去按钮高度，所得的高度设置到手势界面

    -->

    <android.gesture.GestureOverlayView

        android:id="@+id/gestures"

        android:layout_width="fill_parent"

        android:layout_height="fill_parent"

        android:layout_above="@+id/btnCheck"

        android:layout_weight="1"

        android:gestureStrokeType="multiple" />

   <Button

        android:id="@+id/btnCheck"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_alignParentBottom="true"

        android:layout_alignParentLeft="true"

        android:layout_marginBottom="5dp"

        android:layout_weight="0"

        android:onClick="match"

        android:text="@string/check" />

</RelativeLayout>

　　2、后台代码：

package com.example.gesture;



import java.util.List;



import android.R.anim;

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.OnGestureListener;

import android.gesture.Prediction;

import android.net.Uri;

import android.os.Bundle;

import android.util.Log;

import android.view.Menu;

import android.view.MotionEvent;

import android.view.View;

import android.widget.Toast;



public class MainActivity extends Activity {

    

    private static final String TAG="Gesture";

    private GestureOverlayView gestureOverlayView;

    private GestureLibrary mLibrary;

    private boolean state;

    private Gesture gesture;//用户最终画完手势



    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);



        mLibrary = GestureLibraries.fromRawResource(this, R.raw.gestures);

        state = mLibrary.load();//加载手势库

        Log.i(TAG, state+"");

        gestureOverlayView = (GestureOverlayView)this.findViewById(R.id.gestures);

        //当用户完成一次Gesture绘制后，系统将自动调用Listener对象的onGesturePerformed()方法,只支持单笔手势

        //gestureOverlayView.addOnGesturePerformedListener(new GestureListener());

        //可以监听单笔和多笔识别

        gestureOverlayView.addOnGestureListener(new MyGestureListener());

    }

    

    public void match(View v){

        matchGesture(gesture);

        gestureOverlayView.clear(true);

    }

    //单多笔监视

    private final class MyGestureListener implements OnGestureListener{

        @Override

        public void onGesture(GestureOverlayView overlay, MotionEvent event) {

             Log.i(TAG, "onGesture() ... ");

        }

        @Override

        public void onGestureCancelled(GestureOverlayView overlay,

                MotionEvent event) {

            Log.i(TAG, "onGestureCancelled() ... ");

        }

        @Override

        public void onGestureEnded(GestureOverlayView overlay, MotionEvent event) {

            Log.i(TAG, "onGestureEnded() ... ");

            gesture=overlay.getGesture();

        }

        @Override

        public void onGestureStarted(GestureOverlayView overlay,

                MotionEvent event) {

            Log.i(TAG, "onGestureStarted() ... ");

        }

    }

    

    //单笔手势监听类

    private final class GestureListener implements GestureOverlayView.OnGesturePerformedListener{

        @Override

        public void onGesturePerformed(GestureOverlayView overlay, Gesture gesture) {

            if(state){

                matchGesture(gesture);

            }

        }

    }

    private void matchGesture(Gesture gesture) {

        //123：对号，258：X,369:李，456：Z

        //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结果，匹配度高的结果放在最前面

        List<Prediction> predictions = mLibrary.recognize(gesture);

        if(!predictions.isEmpty()){

            Prediction prediction = predictions.get(0);

            //prediction的score属性代表了与手势的相似程度

            //prediction的name代表手势对应的名称

            if(prediction.score > 6){

                if("123".equals(prediction.name)){

                    Intent intent = new Intent(Intent.ACTION_CALL,Uri.parse("tel:159016"));

                    startActivity(intent);

                }else if ("456".equals(prediction.name)) {

                    finish();//关闭activity,会触发onDestroy方法，进而关闭应用

                }else if ("369".equals(prediction.name)) {

                    Toast.makeText(getApplicationContext(), "结果：李", Toast.LENGTH_LONG).show();

                }else if ("258".equals(prediction.name)) {

                    Toast.makeText(getApplicationContext(), "结果：X", Toast.LENGTH_LONG).show();

                }

            }else {

                Toast.makeText(getApplicationContext(), R.string.notfull, Toast.LENGTH_LONG).show();

            }

        }else{

            Toast.makeText(getApplicationContext(), R.string.notfind, Toast.LENGTH_LONG).show();

        }

    }

    @Override

    protected void onDestroy() {

        //杀掉进程

        super.onDestroy();

        android.os.Process.killProcess(android.os.Process.myPid());//关闭应用

    }







    @Override

    public boolean onCreateOptionsMenu(Menu menu) {

        getMenuInflater().inflate(R.menu.main, menu);

        return true;

    }



}