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 onCreate(Bundle savedInstanceState)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 */ getDrawableForFrameNumber(int frameNumber)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