Android实现Gesture手势识别用法分析

<?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>

mLibrary = GestureLibraries.fromRawResource(this, R.raw.gestures);
if (!mLibrary.load()) {
  finish();
}

GestureOverlayView gestures = (GestureOverlayView) findViewById(R.id.gestures);
gestures.addOnGesturePerformedListener(this);

package com.ray.test;
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 TestGesture extends Activity implements OnGesturePerformedListener{
  GestureLibrary mLibrary;
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    GestureOverlayView gestures = (GestureOverlayView) findViewById(R.id.gestures);
    gestures.addOnGesturePerformedListener(this);
    mLibrary = GestureLibraries.fromRawResource(this, R.raw.gestures);
    if (!mLibrary.load()) {
      finish();
    }
  }
  @Override
  public void onGesturePerformed(GestureOverlayView overlay, Gesture gesture) {
    ArrayList predictions = mLibrary.recognize(gesture);
    // We want at least one prediction
    if (predictions.size() > 0) {
      Prediction prediction = (Prediction) predictions.get(0);
      // We want at least some confidence in the result
      if (prediction.score > 1.0) {
        // Show the spell
        Toast.makeText(this, prediction.name, Toast.LENGTH_SHORT).show();
      }
    }
  }
}