Thread
16lz
2021-01-23
android 对UI的操作只能在UI线程(一般是在Activity 的main 线程),那么非UI线程如何通知UI 线程去更新UI呢?在android 里提供了Handler来交互。下面我就记录其中的一种交互方法的例子(这例子也是从android 的源码中总结出来的):
//在UI线程定义
Handler mHandler = new Handler(); // handler for the main thread
Thread mWorkerThread;
protected void onStart() {
// TODO Auto-generated method stub
super.onStart();
mWorkerThread = new Thread("GalleryPicker Worker") {
@Override
public void run() {
//在GalleryPicker worker 线程
System.out.println(Thread.currentThread().getName());
ContentResolver cr = getContentResolver();
final boolean scanning = isMediaScannerScanning(cr);
mHandler.post(new Runnable() {
public void run() {
//在UI main 线程 System.out.println(Thread.currentThread().getName());
checkScanningFinished(scanning);
}
});
}
};
mWorkerThread.start();
}
通过UI Main 线程的handler post可以使得UI线程与非UI线程进行交互!!
//在UI线程定义
Handler mHandler = new Handler(); // handler for the main thread
Thread mWorkerThread;
protected void onStart() {
// TODO Auto-generated method stub
super.onStart();
mWorkerThread = new Thread("GalleryPicker Worker") {
@Override
public void run() {
//在GalleryPicker worker 线程
System.out.println(Thread.currentThread().getName());
ContentResolver cr = getContentResolver();
final boolean scanning = isMediaScannerScanning(cr);
mHandler.post(new Runnable() {
public void run() {
//在UI main 线程 System.out.println(Thread.currentThread().getName());
checkScanningFinished(scanning);
}
});
}
};
mWorkerThread.start();
}
通过UI Main 线程的handler post可以使得UI线程与非UI线程进行交互!!
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