Android example source code file (CreateGestureActivity.java)

This example Android source code file (CreateGestureActivity.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Android by Example" ^TM.

Java - Android tags/keywords

activity, android, charsequence, creategestureactivity, gesture, gesturelibrary, gestureoverlayview, gesturesprocessor, length_threshold, motionevent, os, override, runnable, string, suppresswarnings, textview, ui, unuseddeclaration, view, widget

The CreateGestureActivity.java Android example source code

/*
 * Copyright (C) 2009 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.android.gesture.builder;

import android.app.Activity;
import android.os.Bundle;
import android.os.Environment;
import android.view.View;
import android.view.MotionEvent;
import android.gesture.GestureOverlayView;
import android.gesture.Gesture;
import android.gesture.GestureLibrary;
import android.widget.TextView;
import android.widget.Toast;

import java.io.File;

public class CreateGestureActivity extends Activity {
    private static final float LENGTH_THRESHOLD = 120.0f;

    private Gesture mGesture;
    private View mDoneButton;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        
        setContentView(R.layout.create_gesture);

        mDoneButton = findViewById(R.id.done);

        GestureOverlayView overlay = (GestureOverlayView) findViewById(R.id.gestures_overlay);
        overlay.addOnGestureListener(new GesturesProcessor());
    }

    @Override
    protected void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);
        
        if (mGesture != null) {
            outState.putParcelable("gesture", mGesture);
        }
    }

    @Override
    protected void onRestoreInstanceState(Bundle savedInstanceState) {
        super.onRestoreInstanceState(savedInstanceState);
        
        mGesture = savedInstanceState.getParcelable("gesture");
        if (mGesture != null) {
            final GestureOverlayView overlay =
                    (GestureOverlayView) findViewById(R.id.gestures_overlay);
            overlay.post(new Runnable() {
                public void run() {
                    overlay.setGesture(mGesture);
                }
            });

            mDoneButton.setEnabled(true);
        }
    }

    @SuppressWarnings({"UnusedDeclaration"})
    public void addGesture(View v) {
        if (mGesture != null) {
            final TextView input = (TextView) findViewById(R.id.gesture_name);
            final CharSequence name = input.getText();
            if (name.length() == 0) {
                input.setError(getString(R.string.error_missing_name));
                return;
            }

            final GestureLibrary store = GestureBuilderActivity.getStore();
            store.addGesture(name.toString(), mGesture);
            store.save();

            setResult(RESULT_OK);

            final String path = new File(Environment.getExternalStorageDirectory(),
                    "gestures").getAbsolutePath();
            Toast.makeText(this, getString(R.string.save_success, path), Toast.LENGTH_LONG).show();
        } else {
            setResult(RESULT_CANCELED);
        }

        finish();
        
    }
    
    @SuppressWarnings({"UnusedDeclaration"})
    public void cancelGesture(View v) {
        setResult(RESULT_CANCELED);
        finish();
    }
    
    private class GesturesProcessor implements GestureOverlayView.OnGestureListener {
        public void onGestureStarted(GestureOverlayView overlay, MotionEvent event) {
            mDoneButton.setEnabled(false);
            mGesture = null;
        }

        public void onGesture(GestureOverlayView overlay, MotionEvent event) {
        }

        public void onGestureEnded(GestureOverlayView overlay, MotionEvent event) {
            mGesture = overlay.getGesture();
            if (mGesture.getLength() < LENGTH_THRESHOLD) {
                overlay.clear(false);
            }
            mDoneButton.setEnabled(true);
        }

        public void onGestureCancelled(GestureOverlayView overlay, MotionEvent event) {
        }
    }
}