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      1 /*
      2  * Copyright (C) 2013 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.example.android.keyframeanimation;
     18 
     19 import android.app.Activity;
     20 import android.graphics.Bitmap;
     21 import android.graphics.Canvas;
     22 import android.graphics.Color;
     23 import android.graphics.Paint;
     24 import android.graphics.drawable.AnimationDrawable;
     25 import android.graphics.drawable.BitmapDrawable;
     26 import android.os.Bundle;
     27 import android.view.View;
     28 import android.widget.ImageView;
     29 
     30 /**
     31  * This example shows how to use AnimationDrawable to construct a keyframe animation where each
     32  * frame is shown for a specified duration.
     33  *
     34  * Watch the associated video for this demo on the DevBytes channel of developer.android.com
     35  * or on YouTube at https://www.youtube.com/watch?v=V3ksidLf7vA.
     36  */
     37 public class KeyframeAnimation extends Activity {
     38 
     39     @Override
     40     public void onCreate(Bundle savedInstanceState) {
     41         super.onCreate(savedInstanceState);
     42         setContentView(R.layout.activity_keyframe_animation);
     43 
     44         ImageView imageview = (ImageView) findViewById(R.id.imageview);
     45 
     46         // Create the AnimationDrawable in which we will store all frames of the animation
     47         final AnimationDrawable animationDrawable = new AnimationDrawable();
     48         for (int i = 0; i < 10; ++i) {
     49             animationDrawable.addFrame(getDrawableForFrameNumber(i), 300);
     50         }
     51         // Run until we say stop
     52         animationDrawable.setOneShot(false);
     53 
     54         imageview.setImageDrawable(animationDrawable);
     55 
     56         // When the user clicks on the image, toggle the animation on/off
     57         imageview.setOnClickListener(new View.OnClickListener() {
     58 
     59             @Override
     60             public void onClick(View v) {
     61                 if (animationDrawable.isRunning()) {
     62                     animationDrawable.stop();
     63                 } else {
     64                     animationDrawable.start();
     65                 }
     66             }
     67         });
     68     }
     69 
     70     /**
     71      * The 'frames' in this app are nothing more than a gray background with text indicating
     72      * the number of the frame.
     73      */
     74     private BitmapDrawable getDrawableForFrameNumber(int frameNumber) {
     75         Bitmap bitmap = Bitmap.createBitmap(400, 400, Bitmap.Config.ARGB_8888);
     76         Canvas canvas = new Canvas(bitmap);
     77         canvas.drawColor(Color.GRAY);
     78         Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
     79         paint.setTextSize(80);
     80         paint.setColor(Color.BLACK);
     81         canvas.drawText("Frame " + frameNumber, 40, 220, paint);
     82         return new BitmapDrawable(getResources(), bitmap);
     83     }
     84 
     85 }
     86