我将图像存储在 SD 卡中,并希望使用该图像来运行动画。我为此使用了以下代码,但我的动画根本不起作用。
代码片段
playAnimation("xxx", medid, 25);//calling method
break;
public void playAnimation(String string, int medid2, int length) {
// TODO Auto-generated method stub
animation = new AnimationDrawable();
Bitmap bitMap;
BitmapFactory.Options options = new BitmapFactory.Options();
options.inSampleSize = 2; //reduce quality
player = MediaPlayer.create(this.getApplicationContext(), medid2);
try {
for (int i = 0; i <= length; i++) {
System.out.println("File Name : - " + Environment.getExternalStorageDirectory().toString() + "/" + string + i);
bitMap = BitmapFactory.decodeFile(Environment.getExternalStorageDirectory().toString() + "/" + string + i);
Drawable bmp = new BitmapDrawable(bitMap);
animation.addFrame(bmp, DURATION);
}
animation.setOneShot(true);
animation.setVisible(true, true);
int frames = animation.getNumberOfFrames();
System.out.println("Number of Frames are - " + frames);
img.setBackgroundDrawable(animation);
img.post(new Starter());
} catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
}
}
class Starter implements Runnable {
public void run() {
try {
if(animation.isRunning()) {
animation.stop();
animation.start();
if (player.isPlaying()) {
player.stop();
player.start();
}
else {
player.start();
}
} else {
animation.start();
if (player.isPlaying()) {
player.stop();
player.start();
}
else {
player.start();
}
}
} catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
}
}
}
使用帧动画的概念,我需要运行我的动画。我可以获取图像,因为我已经做了一些调试,但是当我单击按钮并且调用此方法时,我的屏幕不显示任何动画。它只显示黑屏。我没有收到任何错误。如果有人有想法请告诉我。
谢谢
最佳答案
AnimationDrawable 只显示黑屏,可能是由不同原因引起的。例如,在 Android 开发指南中,Drawable Animation ,下面的代码可以让你加载一系列Drawable资源。
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
ImageView rocketImage = (ImageView) findViewById(R.id.rocket_image);
rocketImage.setBackgroundResource(R.drawable.rocket_thrust);
rocketAnimation = (AnimationDrawable) rocketImage.getBackground();
}
但是,如果像下面的代码一样在 getBackground() 之后设置资源,屏幕将保持黑屏。
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
ImageView rocketImage = (ImageView) findViewById(R.id.rocket_image);
rocketAnimation = (AnimationDrawable) rocketImage.getBackground();
rocketImage.setBackgroundResource(R.drawable.rocket_thrust);
}
如果你想从SD卡加载图片,并将其显示为动画,可以引用以下代码。我在 API 8 (2.3) 上编写和测试。
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
showedImage = (ImageView) findViewById(R.id.imageView_showedPic);
showedImage.setBackgroundResource(R.drawable.slides);
frameAnimation = (AnimationDrawable) showedImage.getBackground();
addPicturesOnExternalStorageIfExist();
}
@Override
public void onWindowFocusChanged (boolean hasFocus){
super.onWindowFocusChanged (hasFocus);
frameAnimation.start();
}
private void addPicturesOnExternalStorageIfExist() {
// check if external storage
String state = Environment.getExternalStorageState();
if ( !(Environment.MEDIA_MOUNTED.equals(state) ||
Environment.MEDIA_MOUNTED_READ_ONLY.equals(state)) ) {
return;
}
// check if a directory named as this application
File rootPath = Environment.getExternalStorageDirectory();
// 'happyShow' is the name of directory
File pictureDirectory = new File(rootPath, "happyShow");
if ( !pictureDirectory.exists() ) {
Log.d("Activity", "NoFoundExternalDirectory");
return;
}
// check if there is any picture
//create a FilenameFilter and override its accept-method
FilenameFilter filefilter = new FilenameFilter() {
public boolean accept(File dir, String name) {
return (name.endsWith(".jpeg") ||
name.endsWith(".jpg") ||
name.endsWith(".png") );
}
};
String[] sNamelist = pictureDirectory.list(filefilter);
if (sNamelist.length == 0) {
Log.d("Activity", "No pictures in directory.");
return;
}
for (String filename : sNamelist) {
Log.d("Activity", pictureDirectory.getPath() + '/' + filename);
frameAnimation.addFrame(
Drawable.createFromPath(pictureDirectory.getPath() + '/' + filename),
DURATION);
}
return;
}
关于animation - 如何在 Android 中使用 AnimationDrawable 或 AnimationUtils 从 SD 卡加载图像并运行动画,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/9148779/