Android成长之路-手势识别的实现

 

手势识别系统：

先把手势库放到项目中：（创建手势库见下一篇博客）

在res文件夹下新建一个名为raw的文件夹，然后把手势库放进去

 

然后开始项目的创建：

 

strings.xml:

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

    <string name="app_name">GestureTest</string>
    <string name="notrecognize">没有手势</string>
    <string name="noprediction">手势识别率太低，请重新输入</string>
    <string name="noloading">手势库没有加载成功</string>

</resources>

 

main.xml:

<?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/myGesture"
        android:layout_width="fill_parent"
        android:layout_height="0dip"
        android:layout_weight="1.0"
        />

</LinearLayout>

 

GestureTestActivity.java:

package cn.csdn.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 gestureView;
    GestureLibrary gLibrary;
    boolean loadState;

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

        init();
    }

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

        // 创建首饰库对象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) {//加载手势资源成功
                // 获取画的图形进行匹配，匹配程度就是Prediction中的score
                ArrayList<Prediction> predictions = gLibrary.recognize(gesture);

                if (!predictions.isEmpty()) {// 如果用户画了图形，就会匹配

                    Prediction prediction = predictions.get(0);
                    Log.i("TAG", String.valueOf(prediction.score));
                    if (prediction.score > 5) {// 判断相似度大于1，与里面的两者进行匹配
                        if ("close".equals(prediction.name)) {//关闭
                            finish();
                        } else if ("dialto".equals(prediction.name)) {//打电话
                            Intent intent = new Intent(Intent.ACTION_CALL,
                                    Uri.parse("tel:11111111111"));
                            startActivity(intent);
                        }
                    } else {// 相似度小于1，不识别
                        showToast(R.string.noprediction);
                    }
                } else {//没有画图形
                    showToast(R.string.notrecognize);
                }
            } else {
                showToast(R.string.noloading);
            }
        }
    }

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

 

效果图：（必须画的比较精确）

如果画c形状的话，会退出这个程序

 

如果画一个对钩的话，会去进行拨号的操作