Android中添加和识别手势操作

实现思路：将手势写入GestureLibrary中，对其他手势进行匹配对比，进行识别

<android.gesture.GestureOverlayViewandroid:id="@+id/add_gesture"android:layout_width="match_parent"android:layout_height="match_parent"android:layout_weight="1"android:gestureStrokeType="multiple"/><Viewandroid:layout_width="match_parent"android:layout_height="1dp"android:background="#AFAFAF"/><android.gesture.GestureOverlayViewandroid:id="@+id/recognize_gesture"android:layout_width="match_parent"android:layout_height="match_parent"android:layout_weight="1"android:gestureStrokeType="multiple"/>

android:gestureStrokeType="" multiple：手势需要多笔完成single：手势一笔完成

代码：

package top.helloworlds.gesture;import android.content.DialogInterface;import android.gesture.Gesture;import android.gesture.GestureLibraries;import android.gesture.GestureLibrary;import android.gesture.GestureOverlayView;import android.gesture.Prediction;import android.graphics.Bitmap;import android.graphics.Color;import android.os.Bundle;import android.support.v7.app.AlertDialog;import android.support.v7.app.AppCompatActivity;import android.support.v7.widget.Toolbar;import android.view.View;import android.widget.ArrayAdapter;import android.widget.EditText;import android.widget.ImageView;import android.widget.Toast;import java.util.ArrayList;public class MainActivity extends AppCompatActivity {GestureOverlayView addGesture;GestureOverlayView recognizeGesture;GestureLibrary library;//设置手势库存储的路径final String LIBRARY_PATH = "/mnt/sdacrd/Gesture";@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);setSupportActionBar(toolbar);//添加手势addNewGesture();//识别手势recognizeTheGesture();}private void recognizeTheGesture() {//读取手势库library = GestureLibraries.fromFile(LIBRARY_PATH);if (library.load()) {Toast.makeText(MainActivity.this, "装载成功", Toast.LENGTH_SHORT).show();} else {Toast.makeText(MainActivity.this, "装载失败", Toast.LENGTH_SHORT).show();}//获取手势编辑组件recognizeGesture = (GestureOverlayView) findViewById(R.id.recognize_gesture);//为组件添加监听器recognizeGesture.addOnGesturePerformedListener(new GestureOverlayView.OnGesturePerformedListener() {@Overridepublic void onGesturePerformed(GestureOverlayView overlay, Gesture gesture) {//识别绘制的手势库ArrayList<Prediction> predictions = library.recognize(gesture);ArrayList<String> result = new ArrayList<String>();//遍历所有找到的Prediction对象for (Prediction pred : predictions) {//当相识度大于2.0时输出if (pred.score > 2.0) {result.add("与"+pred.name+"相似的为"+pred.score);}}if (result.size() > 0) {//使用一个带List的对话框来显示所有匹配的手势ArrayAdapter<Object> adapter = new ArrayAdapter<Object>(MainActivity.this,android.R.layout.simple_dropdown_item_1line,result.toArray());//显示在对话框内new AlertDialog.Builder(MainActivity.this).setAdapter(adapter, null).setPositiveButton("确定", null).show();} else {Toast.makeText(MainActivity.this, "未找到匹配的手势", Toast.LENGTH_SHORT).show();}}});}private void addNewGesture() {//获取手势编辑视图addGesture = (GestureOverlayView) findViewById(R.id.add_gesture);//设置手势绘制的颜色addGesture.setGestureColor(Color.RED);//设置手势的绘制宽度addGesture.setGestureStrokeWidth(4);//添加监听事件addGesture.addOnGesturePerformedListener(new GestureOverlayView.OnGesturePerformedListener() {@Overridepublic void onGesturePerformed(GestureOverlayView overlay, final Gesture gesture) {//加载布局文件所代表的视图View saveDialog = getLayoutInflater().inflate(R.layout.dialog, null);ImageView imageView = (ImageView) saveDialog.findViewById(R.id.imageView);final EditText editText = (EditText) saveDialog.findViewById(R.id.editText);//根据Gesture包含的手势创建位图Bitmap bitmap = gesture.toBitmap(128, 128, 10, Color.RED);imageView.setImageBitmap(bitmap);//使用对话框显示布局文件new AlertDialog.Builder(MainActivity.this).setView(saveDialog).setPositiveButton("保存", new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialog, int which) {//获取指定文件对应的手势库GestureLibrary gestureLibrary = GestureLibraries.fromFile(LIBRARY_PATH);//添加手势gestureLibrary.addGesture(editText.getText().toString(), gesture);//保存手势库gestureLibrary.save();}}).setNegativeButton("取消", null).show();}});}}

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