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public class MainActivity extends AppCompatActivity {

    private MyGestureListener mgListener;
    private GestureDetector mDetector;
    private final static String TAG = "MyGesture";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        //Instantiate GestureListener and GestureDetector
}else if(e1.getY() - e2.getY() < MIN_MOVE){
                finish();
                Toast.makeText(MainActivity.this,"Close Activity with gesture",Toast.LENGTH_SHORT).show();
            }
            return true;
        }
    }

}

**Result Analysis:** From the comparison above, it can be seen that using SimpleOnGestureListener is simpler than SimpleOnGestureListener. You can override whatever method you want. Additionally, the example is quite simple, so you can try other ways to play with it, such as zooming in on an image through gestures.

---

## 4.Gesture Addition and Recognition:

>

In addition to the gesture detection explained above, Android also allows us to add gestures and provides related recognition APIs;
In Android, GestureLibrary is used to represent the gesture library, and the GestureLibraries utility class is provided to create a gesture library!

**Four static methods to load the gesture library:**

After obtaining the GestureLibraries object, you can use the following methods provided by the object for corresponding operations:

**Related Methods:**

- public void **addGesture** (String entryName, Gesture gesture): Add a gesture named entryName.

- public Set<String> **getGestureEntries** (): Get the names of all gestures in the gesture library.

- public ArrayList<Gesture> **getGestures** (String entryName): Get all gestures corresponding to the entryName.

- public ArrayList<Prediction> **recognize** (Gesture gesture): Recognize all gestures in the current gesture library that match the gesture.

- public void **removeEntry** (String entryName): Delete the gesture corresponding to the entryName in the gesture library.

- public void **removeGesture** (String entryName, Gesture gesture): Delete the gesture in the gesture library that matches both entryName and gesture.

- public abstract boolean **save** (): Call this method to save the gesture library after adding or deleting gestures.

**GestureOverlayView Gesture Editing Component:**

Android provides three listener interfaces for GestureOverlayView, as follows, and the commonly used one is: **OnGesturePerformedListener**; used to respond when the gesture is completed!

---

## 5.Gesture Addition Example:

PS: The example refers to the code from Li Gang's "Android Crazy Lecture Notes"

**Running Effect Picture:**

Well, let's post the implementation code below:

Two layout files: activity_main.xml and dialog_save.xml

activity_main.xml

<TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Please draw a gesture on the screen below~"
        android:textSize="20sp"/>


<!-- gestureStrokeType controls whether the gesture needs to be completed in one stroke, multiple means allowing multiple strokes -->
&lt;android.gesture.GestureOverlayView
    android:id="@+id/gesture"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gestureStrokeType="multiple" />

dialog_save.xml

<LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">
    <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginRight="8dp"
            android:text="Please enter the gesture name:"/>
    <EditText
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:id="@+id/edit_name"/>
</LinearLayout>

<ImageView
        android:id="@+id/img_show"
        android:layout_width="128dp"
        android:layout_height="128dp"
        android:layout_marginTop="10dp"/>

**MainActivity.java:**

private EditText editText;
private GestureOverlayView gesture;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    //After obtaining the gesture editing component, set the relevant parameters
    gesture = (GestureOverlayView) findViewById(R.id.gesture);
    gesture.setGestureColor(Color.GREEN);
    gesture.setGestureStrokeWidth(5);
    gesture.addOnGesturePerformedListener(new GestureOverlayView.OnGesturePerformedListener() {
        @Override
        public void onGesturePerformed(Gesture

private GestureOverlayView gesture;
private GestureLibrary gestureLibrary;
private Context mContext;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    mContext = MainActivity.this;
    gestureLibrary = GestureLibraries.fromFile("mmt/sdcard/mygestures");
    if (gestureLibrary.load()) {
        Toast.makeText(mContext, "Gesture library loaded successfully", Toast.LENGTH_SHORT).show();
    } else {
        Toast.makeText(mContext, "Failed to load gesture library", Toast.LENGTH_SHORT).show();
    }

    //After obtaining the gesture editor component, set the relevant parameters
    gesture = (GestureOverlayView) findViewById(R.id.gesture);
    gesture.setGestureColor(Color.GREEN);
    gesture.setGestureStrokeWidth(5);
    gesture.addOnGesturePerformedListener(new GestureOverlayView.OnGesturePerformedListener() {
        @Override
        public void onGesturePerformed(GestureOverlayView gestureOverlayView, final Gesture gesture) {
            //Recognize the gesture that the user has just drawn
            ArrayList<Prediction> predictions = gestureLibrary.recognize(gesture);
            ArrayList<String> result = new ArrayList<String>();
            //Iterate through all found Prediction objects
            for (Prediction pred : predictions) {
                if (pred.score > 2.0) {
                    result.add("Similarity with gesture [" + pred.name + "] is " + pred.score);
                }
            }
            if (result.size() > 0) {
                ArrayAdapter<Object> adapter = new ArrayAdapter<Object>(mContext,
                        android.R.layout.simple_dropdown_item_1line, result.toArray());
                new AlertDialog.Builder(mContext).setAdapter(adapter,null).setPositiveButton("OK",null).show();
            }else{
                Toast.makeText(mContext,"No matching gesture found!",Toast.LENGTH_SHORT).show();
            }
        }
    });
}

Also don't forget to add the SD card read permission in the AndroidManifest.xml file: