Analysis of the usage of Gesture gesture recognition in Android

This article analyzes the usage of Gesture gesture recognition in Android implementation. Shared with everyone for reference. Specifically as follows:

I'm glad to be able to in Android1.6I saw the gesture recognition feature in the sdk, and I have been thinking about how to implement the gesture control of nds games in android (more accurately, it should be pen gesture) to control the game character? Now I finally see a little light, but there are still many details to deal with to make the gestures as flexible as pen gestures.

In Android1.6The emulator pre-installs a program called Gestures Builder, which allows you to create your own gestures (the source code of Gestures Builder is in the sdk samples, you can take a look if you are interested). The gestures created will be saved to/sdcard/gestures, copy this file to your project/res/Copy these gestures to/res/The gestures in raw are read-only, which means you cannot modify or add gestures. If you want to implement modifications, you can directly load the gestures file from the sd card.

In this example, I created such a gesture:

Step 2: Create GestureOverlayView in layout, this transparent view is used for drawing gestures on it, and it can overlay other Views:

<?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>

Step 3: Load Gesture:

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

Step 4: Add the response function OnGesturePerformedListener:

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

The above four steps can realize a simple Gesture recognition prototype:

The program's running result is as follows, write a letter 'a', and the program recognizes it and then shows a toast 'a':

The complete code is as follows:

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();
      }
    }
  }
}

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I hope the content described in this article will be helpful to everyone in Android program design.

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