Android：等待对象出现
我想不出等待对象出现的正确方法。我正在编写一个相机应用程序。拍照后，我将 GPS 数据写入 exif 标签中。在写入之前，我必须等待位置对象出现。我的快速而肮脏的解决方法是启动一个新线程并使用 while 循环来“等待”对象：
private static class MyRunnable implements Runnable {
private final String imagePath;
private final String thumbPath;
MyRunnable(final String anImagePath, String aThumbPath) {
this.imagePath = anImagePath;
this.thumbPath = aThumbPath;
}
public void run() {
while (mCurrentLocation == null) {
//do nothing
}
try {
writeExifTags(imagePath);
writeExifTags(thumbPath);
}
catch (NullPointerException e) {
Log.i(TAG, "NullPointerException");
}
}
}
这可行，但空的 while 循环看起来非常难看。我想到了该对象的某种处理程序，但想不出一种使用处理程序来检查 mCurrentLocation 是否存在的方法。有谁有智慧的闪光吗？ :)（是的，try/catch 块现在已经过时了 ^^）
I cannot think of a proper way to wait for an object to appear. I am writing a camera app. After taking a picture, I am writing GPS Data into the exif tags. I have to wait for the location object to appear, before writing. My quick and dirty fix is to start a new thread and use a while loop to "wait" for the object:
private static class MyRunnable implements Runnable {
private final String imagePath;
private final String thumbPath;
MyRunnable(final String anImagePath, String aThumbPath) {
this.imagePath = anImagePath;
this.thumbPath = aThumbPath;
}
public void run() {
while (mCurrentLocation == null) {
//do nothing
}
try {
writeExifTags(imagePath);
writeExifTags(thumbPath);
}
catch (NullPointerException e) {
Log.i(TAG, "NullPointerException");
}
}
}
This works but the empty while-loop looks very ugly. I think of some kind of handler for the object but cannot think of a way to use handlers to check for the existence of mCurrentLocation. Anyone with a flash of wit? :) (Yes the try/ catch block is obsolete now ^^)
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您可以尝试使用 AsyncTask 吗？
You could try using an AsyncTask?