[英]How to resolve that getActivity() is null, when I create an ImageView in Fragment
[英]How to terminate the Thread when getActivity becomes null
通常用於終止Thread,使用以下代碼:
new Thread((new Runnable() { @Override public void run() { ........ if (getActivity == null) return; } } ).start();
在這段代碼中,檢查getActivity僅執行一次。 是否有任何代碼,以便每當getActivity變為null時,就從調用它的線程上調用return。
您可以捕獲NullPointerException:
new Thread((new Runnable() {
@Override
public void run() {
try {
while (true) {
...
// reference null Activity. Throw NPE
...
}
} catch (NullPointerException e) {
Log.e(DEBUG, "Activity reference became null. Finishing thread.");
}
}
} ).start();
您只需要像這樣停止線程:
new Thread((new Runnable() {
@Override
public void run() {
........
if (getActivity == null) return; //@tgkprog
}
} ).start();
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