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[英]android - how to get the image edge x/y position inside imageview
[英]android Position an image inside an ImageView animation
您可以通过创建一个线程和一个处理程序来做到这一点,该线程在该线程中休眠一定时间,并在唤醒时通过发送消息通知处理程序,并且处理程序将更新图像视图中的图像。
创建如下四个字段:
private ImageView mImageView;
private Handler mImageChangingHandler;
private int mCurrentImageIndex = 0;
private BackgroundThread mImageUpdateThread;
在onCreate()
获取ImageView,溢出您的位图并将其添加到列表中,并创建一个更新imageview的处理程序。 在这里,您应该知道主Bitmap 中单个位图的数量 。 喜欢 :
mImageView = (ImageView) findViewById(R.id.img);
Bitmap mainBitmap = BitmapFactory.decodeResource(getResources(), R.drawable.anim);
//number of individual bitmaps, which you should know.
final int numberOfImages = 21;
//individual bitmap width
int bitmapWidth = mainBitmap.getWidth() / numberOfImages;
//individual bitmap height
int bitmapHeight = mainBitmap.getHeight();
//list which holds individual bitmaps.
final List<Bitmap> animBitmaps = new ArrayList<>(numberOfImages);
//split your bitmap in to individual bitmaps
for (int index = 0; index < numberOfImages; index++) {
animBitmaps.add(Bitmap.createBitmap(mainBitmap, index * bitmapWidth, 0, bitmapWidth, bitmapHeight));
}
//set 1st bitmap to imageView.
mImageView.setImageBitmap(animBitmaps.get(mCurrentImageIndex));
mImageChangingHandler = new Handler(new Handler.Callback() {
@Override
public boolean handleMessage(Message msg) {
//increament current bitmap index
mCurrentImageIndex++;
//if current index is greater than the number of images, reset it to 0
if (mCurrentImageIndex > numberOfImages - 1) {
mCurrentImageIndex = 0;
}
mImageView.setImageBitmap(animBitmaps.get(mCurrentImageIndex));
return true;
}
});
//Create the background thread by passing the handler and start.
mImageUpdateThread = new BackgroundThread(mImageChangingHandler);
mImageUpdateThread.setRunning(true);
mImageUpdateThread.start();
这将是您的BackgroundThread.class
:
public static class BackgroundThread extends Thread {
private Handler mHandler;
private boolean mRunning;
public BackgroundThread(Handler handler) {
mHandler = handler;
}
public void setRunning(boolean running) {
mRunning = running;
}
@Override
public void run() {
super.run();
while (mRunning) {
try {
//this sleeps for 100 milliseconds
sleep(100);
} catch (InterruptedException e) {
e.printStackTrace();
} finally {
//send message to handler after sleep
mHandler.sendEmptyMessage(0);
}
}
}
}
最后在onDestroy()
停止线程。 喜欢 :
mImageUpdateThread.setRunning(false);
boolean stopThread = true;
while (stopThread) {
try {
mImageUpdateThread.join();
//thread already stopped
stopThread = false;
} catch (InterruptedException e) {
e.printStackTrace();
}
}
mImageUpdateThread = null;
注意:如果要提高更新速度,请减少线程中的睡眠时间。
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