android－手势

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"

1.手势使用控件android.gesture.GestureOverlayView

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
	<android.gesture.GestureOverlayView
	    android:id="@+id/gestures"
	    android:layout_width="fill_parent"
	    android:layout_height="0dp"
	    android:layout_weight="1"
	    android:gestureStrokeType="multiple"
	    />
	<Button
	android:layout_weight="0"
	 android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="@string/recognize"
    android:onClick="find"
    />
</LinearLayout>

2.将手势库放在raw文件夹下

3.实现代码

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.OnGestureListener;
import android.gesture.GestureOverlayView.OnGesturePerformedListener;
import android.gesture.Prediction;
import android.net.Uri;
import android.os.Bundle;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.widget.Toast;

public class MainActivity extends Activity {
	private static final String TAG = "MainActivity";
    private GestureLibrary library;
    private Gesture mgesture;
    private GestureOverlayView overlayView;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        library = GestureLibraries.fromRawResource(this, R.raw.gestures);
        library.load();//加载手势
        
        overlayView = (GestureOverlayView) this.findViewById(R.id.gestures);
        //只针对单笔手势：overlayView.addOnGesturePerformedListener(new GesturePerformedListener());
        overlayView.addOnGestureListener(new GestureListener());
    }
    
    public void find(View v){
    	recognize(mgesture);
    	overlayView.clear(true);//清除界面上手势
    }
    
    //多笔手势监听
    private final class GestureListener implements OnGestureListener{
		public void onGestureStarted(GestureOverlayView overlay, MotionEvent event) {
			Log.i(TAG, "onGestureStarted()");
		}
		public void onGesture(GestureOverlayView overlay, MotionEvent event) {
			Log.i(TAG, "onGesture()");
		}
		public void onGestureEnded(GestureOverlayView overlay, MotionEvent event) {
			Log.i(TAG, "onGestureEnded()");
			mgesture = overlay.getGesture();//每个手势结束都会调用
		}
		public void onGestureCancelled(GestureOverlayView overlay, MotionEvent event) {
			Log.i(TAG, "onGestureCancelled()");
		}
    }
    
    //单笔手势监听
    private final class GesturePerformedListener implements OnGesturePerformedListener{
		public void onGesturePerformed(GestureOverlayView overlay, Gesture gesture) {
			recognize(gesture);
		}		
    }
    
    private void recognize(Gesture gesture) {
		ArrayList<Prediction> predictions = library.recognize(gesture);//手势匹配
		if(!predictions.isEmpty()){//如果有匹配成功
			Prediction prediction = predictions.get(0);//数组按匹配度排序，获取匹配度最高度一个手势
			if(prediction.score >= 6){//如果匹配度高于60%，prediction.score取之0-10（0％－100%）
				if("zhangxx".equals(prediction.name)){//对比手势名称
					Intent intent = new Intent(Intent.ACTION_CALL, Uri.parse("tel:1350505050"));
					startActivity(intent);
				}else if("close".equals(prediction.name)){
					finish();//关闭Activity
				}
			}else{
				Toast.makeText(getApplicationContext(), "手势匹配度太低", 1).show();
			}
		}else{
			Toast.makeText(getApplicationContext(), "手势不匹配", 1).show();
		}
	}
    
	@Override
	protected void onDestroy() {
		super.onDestroy();
		android.os.Process.killProcess(android.os.Process.myPid());//关闭应用
	}
    
}