Java乔晓松-android中的手势识别的详解

对于android中的手势识别，效果如下图所示：

模拟器中有个可以添加手势的工具Gestures Builder，可以添加手势如下图所示：

当添加手势成功后，会在Sdcard上产生保存的手势的文件gestures，如下图所示：

你需要把sdcard中的gestures文件拷贝到项目中去

手势识别的完整的代码如下：

package com.example.demo1;import java.util.ArrayList;import android.app.Activity;import android.gesture.Gesture;import android.gesture.GestureLibraries;import android.gesture.GestureLibrary;import android.gesture.GestureOverlayView;import android.gesture.Prediction;import android.gesture.GestureOverlayView.OnGesturePerformedListener;import android.os.Bundle;import android.widget.Toast;public class MainActivity extends Activity implements OnGesturePerformedListener {GestureLibrary mLibrary;@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);GestureOverlayView gestures = (GestureOverlayView) findViewById(R.id.gestures);gestures.addOnGesturePerformedListener(this);mLibrary = GestureLibraries.fromRawResource(this, R.raw.gestures);if (!mLibrary.load()) {finish();}}@Overridepublic void onGesturePerformed(GestureOverlayView overlay, Gesture gesture) {ArrayList predictions = mLibrary.recognize(gesture);// We want at least one predictionif (predictions.size() > 0) {Prediction prediction = (Prediction) predictions.get(0);// We want at least some confidence in the resultif (prediction.score > 1.0) {// Show the spellToast.makeText(this, prediction.name, Toast.LENGTH_SHORT).show();}}}}

布局文件的代码如下：

<?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"      >  <TextView        android:layout_width="fill_parent"       android:layout_height="wrap_content"       android:text="@string/hello"      />  <android.gesture.GestureOverlayView      android:id="@+id/gestures"      android:layout_width="fill_parent"       android:layout_height="0dip"      android:layout_weight="1.0"       />  </LinearLayout>

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