@Background
这个注解表明，这个方法将运行现UI线程以外的线程中
这个方法是在单独的线程上执行，但这并不一定意味着开启一个新的线程，因为会使用共享缓存线程池执行器，防止创建太多的线程。
@EActivity(R.layout.activity_test)public class TestActivity extends Activity { @UiThread void Toast(String text, int time){ Toast.makeText(this, text, time).show(); } @Background public void testBackgroundThread(String res) { Toast("show String " + res, Toast.LENGTH_LONG); } @AfterViews void afterView(){ testBackgroundThread("hello"); }}如果你想取消后台任务，你可以使用ID字段进行取消。每个任务你都可以用BackgroundExecutor.cancelAll("id");进行取消。
@EActivity(R.layout.activity_test)public class TestActivity extends Activity { @UiThread void Toast(String text, int time){ Toast.makeText(this, text, time).show(); } @Background(id="cancellable_task") public void testBackgroundThread(String res) { Toast("show String " + res, Toast.LENGTH_LONG); } @Click(R.id.bt_one) void cancelBackgroundThread(){ BackgroundExecutor.cancelAll("cancellable_task", true); } @AfterViews void afterView(){ testBackgroundThread("hello"); }}在默认情况下，@Background是并行处理的。如果你想顺序的执行，您可以使用“serial”字段。所有的后台任务，如果具有相同的serial，将被按顺序执行。
@EActivity(R.layout.activity_test)public class TestActivity extends Activity { @UiThread void Toast(String text, int time){ Toast.makeText(this, text, time).show(); } @Background(serial = "test") public void testBackgroundThread(String res,int index) { Toast("show String " + res + " , index = " + index, Toast.LENGTH_LONG); try { Thread.sleep(10000); } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } } @AfterViews void afterView(){ for (int i = 0; i < 10; i++) testBackgroundThread("hello",i); }}如果你需要Background方法延迟一定时间运行，您可以使用delay参数：
@EActivity(R.layout.activity_test)public class TestActivity extends Activity { @UiThread void Toast(String text, int time){ Toast.makeText(this, text, time).show(); } @Background(delay=2000) public void testBackgroundThread(String res,int index) { Toast("show String " + res + " , index = " + index, Toast.LENGTH_LONG); try { Thread.sleep(10000); } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } } @AfterViews void afterView(){ testBackgroundThread("hello",1); }}- 如果在delay开始前，取消线程，线程不会执行
- 如果启动多个线程，线程名子一样的话，取消线程的话，所有相同名字的线程都会取消
- 如果串行执行时取消线程，后续的线程不会执行。
@UiThread
@UIThread 表明该方法将运行在UI线程上
代码示例
@EActivity(R.layout.activity_test)public class TestActivity extends Activity { @UiThread void Toast(String text, int time){ Toast.makeText(this, text, time).show(); } @Background(delay=2000) public void testBackgroundThread(String res,int index) { Toast("show String " + res + " , index = " + index, Toast.LENGTH_LONG); } @AfterViews void afterView(){ testBackgroundThread("hello",1); }}如果你需要该方法延迟一定时间运行，您可以使用delay参数：
@EActivity(R.layout.activity_test)public class TestActivity extends Activity { @UiThread(delay=2000) void Toast(String text, int time){ Toast.makeText(this, text, time).show(); } @Background(delay=2000) public void testBackgroundThread(String res,int index) { Toast("show String " + res + " , index = " + index, Toast.LENGTH_LONG); } @AfterViews void afterView(){ testBackgroundThread("hello",1); }}如果你要优化UI Thread的调用，你需要设置propagation = Propagation.REUSE这个参数。
@EActivity(R.layout.activity_test)public class TestActivity extends Activity { @UiThread(propagation = Propagation.REUSE) void Toast(String text, int time){ Toast.makeText(this, text, time).show(); } @Background(delay=2000) public void testBackgroundThread(String res,int index) { Toast("show String " + res + " , index = " + index, Toast.LENGTH_LONG); } @AfterViews void afterView(){ testBackgroundThread("hello",1); }}@[email protected]
这两个注解可以保证方法是在正确的线程中调用
- @SupposeBackground 这个注解确保从后台线程调用，如果不是在后台进行调用会引发 IllegalStateException
- @SupposeUiThread 这个注解确保从UI线程调用。如果不是，那么就会抛出IllegalStateException。
示例代码
@EBeanpublic class MyBean { @SupposeBackground void someMethodThatShouldNotBeCalledFromUiThread() { //if this method will be called from the UI-thread an exception will be thrown } @SupposeBackground(serial = {"serial1", "serial2"}) void someMethodThatShouldBeCalledFromSerial1OrSerial2() { //if this method will be called from another thread then a background thread with a //serial "serial1" or "serial2", an exception will be thrown } @SupposeUiThread void someMethodThatShouldBeCalledOnlyFromUiThread() { //if this method will be called from a background thread an exception will be thrown }}