本文地址：http://blog.csdn.net/tiandixuanwuliang/article/details/78089775

本文将介绍如何使用face++的API接口实现手势识别。

手势识别和人脸识别基本代码相同，请大家结合“使用face++的API接口-人脸识别”一文学习。

一、GestureFragment.java代码（核心逻辑代码）

package com.wllfengshu.boyandgirl;

import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

import org.json.JSONException;
import org.json.JSONObject;

import android.annotation.SuppressLint;
import android.app.Fragment;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Paint;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;

import com.wllfengshu.util.Constant;
import com.wllfengshu.util.DrawUtil;
import com.wllfengshu.util.GifView;
import com.wllfengshu.util.HttpUtils;
import com.wllfengshu.util.ImageUtil;

@SuppressLint({ "NewApi", "HandlerLeak" })
public class GestureFragment extends Fragment implements OnClickListener {
	private ImageView iv_gesture; 
	private Button ib_gesture_enter; 
	private Button ib_gesture_choice; 

	private TextView tv_gesture;

	private Bitmap scalingPhoto;// 浣嶅浘

	private String gesture;

	private Paint paint;// 鐢荤瑪宸ュ叿
	private View view;
	private GifView gif;

	@Override
	public View onCreateView(LayoutInflater inflater, ViewGroup container,
			Bundle savedInstanceState) {
		view = inflater.inflate(R.layout.fragment_gesture, container, false);

		iv_gesture = (ImageView) view.findViewById(R.id.iv_gesture);
		ib_gesture_enter = (Button) view.findViewById(R.id.ib_gesture_enter);
		ib_gesture_choice = (Button) view.findViewById(R.id.ib_gesture_choice);

		tv_gesture = (TextView) view.findViewById(R.id.tv_gesture);
		gif = (GifView) view.findViewById(R.id.gif);
		ib_gesture_enter.setOnClickListener(this);
		ib_gesture_choice.setOnClickListener(this);

		paint = new Paint();

		scalingPhoto = BitmapFactory.decodeResource(this.getResources(),
				R.drawable.defualtg);
		return view;
	}

	@SuppressLint("HandlerLeak")
	private Handler handler = new Handler() {
		@Override
		public void handleMessage(Message msg) {
			String str = (String) msg.obj;
			System.out.println("********gesture:" + str);
			if (str.equals("403") || str.equals("400") || str.equals("413")
					|| str.equals("500")) {
				Toast.makeText(getActivity(), "Please Try Again",
						Toast.LENGTH_SHORT).show();
			} else {
				try {
					JSONObject resultJSON = new JSONObject(str);
					gesture = DrawUtil.GesturePrepareBitmap(resultJSON,
							scalingPhoto, paint, iv_gesture);

					System.out.println("------------gesture" + gesture);
					
					tv_gesture.setText("手势:" + gesture);
				} catch (JSONException e) {
					e.printStackTrace();
				}
			}
			gif.setVisibility(View.GONE);// 鍋滄gif
		};
	};

	@Override
	public void onActivityResult(int requestCode, int resultCode, Intent data) {
		if (requestCode == 1) {

			if (data != null) {

				String photoPath = ImageUtil.getPhotoPath(getActivity(), data);

				scalingPhoto = ImageUtil.getScalingPhoto(photoPath);

				iv_gesture.setImageBitmap(scalingPhoto);
			}
		}
		super.onActivityResult(requestCode, resultCode, data);
	}

	@Override
	public void onClick(View v) {
		switch (v.getId()) {
		case R.id.ib_gesture_choice:
			
			Intent intent = new Intent();
			intent.setAction(Intent.ACTION_PICK);
			intent.setType("image/*");
			startActivityForResult(intent, 1);
			break;
		case R.id.ib_gesture_enter:

			gif.setVisibility(View.VISIBLE);
			gif.setMovieResource(R.raw.red);

			String base64ImageEncode = ImageUtil
					.getBase64ImageEncode(scalingPhoto);
			System.out.println(base64ImageEncode);

			final Map<String, Object> map = new HashMap<String, Object>();
			map.put("api_key", Constant.API_KEY);
			map.put("api_secret", Constant.API_SECRET);
			map.put("image_base64", base64ImageEncode);

			new Thread(new Runnable() {
				@Override
				public void run() {
					try {
						String result = HttpUtils.post(Constant.URL_GESTURE,
								map);
						Message message = new Message();
						message.obj = result;
						handler.sendMessage(message);
					} catch (IOException e) {
						e.printStackTrace();
					}
				}
			}).start();
			break;
		}
	}
}

二、手势返回值解析：

public static String GesturePrepareBitmap(JSONObject jsObject,
			Bitmap scalingPhoto, Paint paint, ImageView imageView)
			throws JSONException {
		String gestureEN = "";
		Bitmap bitmapPre = Bitmap.createBitmap(scalingPhoto.getWidth(),
				scalingPhoto.getHeight(), scalingPhoto.getConfig());
		Canvas canvas = new Canvas(bitmapPre);
		canvas.drawBitmap(scalingPhoto, 0, 0, null);

		final JSONArray jsonArray = jsObject.getJSONArray("hands");
		Integer num = jsonArray.length();
		for (int i = 0; i < num; i++) {
			JSONObject hands = jsonArray.getJSONObject(i);
			JSONObject postion = hands.getJSONObject("hand_rectangle");
			JSONObject gesture = hands.getJSONObject("gesture");
			 
			Map<String, Double> mapGesture = ImageUtil.GetMapGesture(gesture);

			String gestureUS = ImageUtil.getGestureUS(mapGesture);
			gestureEN = ImageUtil.getGestureENS(gestureUS);
			System.out.println("-- " + gestureEN);
			 

			float y = (float) postion.getDouble("top");
			float x = (float) postion.getDouble("left");

			float w = (float) postion.getDouble("width");
			float h = (float) postion.getDouble("height");
			System.out.println("x:" + x + " y:" + y + " w:" + w + " h" + h);

			System.out.println(bitmapPre.getWidth() + "   "
					+ bitmapPre.getHeight());
			System.out.println("x:" + x + " y:" + y + " w:" + w + " h" + h);

			paint.setColor(Color.RED);
			paint.setStrokeWidth(5);
			 
			canvas.drawLine(x, y, x + w, y, paint); 
			canvas.drawLine(x, y + h, x + w, y + h, paint); 
			canvas.drawLine(x, y, x, y + h, paint); 
			canvas.drawLine(x + w, y, x + w, y + h, paint); 

			scalingPhoto = bitmapPre;
			imageView.setImageBitmap(scalingPhoto);
		}
		return gestureEN;
	}
三、手势识别布局界面 

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

	<TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:text="手势识别"
        android:textSize="20sp" />
    <ImageView
        android:id="@+id/iv_gesture"
        android:layout_width="200dp"
        android:layout_height="300dp"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:contentDescription="人脸图片"
        android:paddingTop="40dp"
        android:src="@drawable/defualtg" />

    <LinearLayout
        android:id="@+id/ll_gesture"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@id/iv_gesture"
        android:layout_marginLeft="10dp"
        android:layout_marginRight="10dp"
        android:gravity="center_horizontal"
        android:orientation="horizontal" >

        <Button
            android:id="@+id/ib_gesture_enter"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:background="@drawable/enter"
            android:text="确定" />

        <Button
            android:id="@+id/ib_gesture_choice"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:background="@drawable/choose"
            android:text="选择图片" />
    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_below="@id/ll_gesture"
        android:orientation="horizontal"
        android:paddingTop="20dp" >

        <TextView
            android:id="@+id/tv_gesture"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:gravity="center"
            android:src="@drawable/ic_launcher"
            android:text="手势"
            android:textSize="20sp" />
    </LinearLayout>

    <com.wllfengshu.util.GifView
        android:id="@+id/gif"
        android:layout_width="200dp"
        android:layout_height="200dp"
        android:layout_centerHorizontal="true"
        android:layout_gravity="center_horizontal"
        android:layout_marginTop="60dp"
        android:enabled="false" />

</RelativeLayout>
四、手势识别界面

本文还有一些其他的封装函数，由于篇幅问题不一一粘贴，请大家自行下载本文代码案例：
下载地址：http://download.csdn.net/download/tiandixuanwuliang/9984027

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