我已经实现了一个 otto 总线示例。它工作正常,但仅在我第二次访问该活动时。
例如,当我加载应用程序并点击秘密消息按钮时,我被带到了活动中,但 toast 没有显示。然后我点击后退按钮返回到 MainActivity 并再次点击显示秘密消息按钮,当我被带到秘密消息活动时,会显示 toast。我意识到它第二次起作用了,因为我没有取消注册事件而造成了泄漏。
我在逻辑上有什么遗漏吗?
主要活动:
public class MainActivity extends AppCompatActivity {
Button buttonSecretMessage;
Intent intentToMessage;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
intentToMessage = new Intent(MainActivity.this, SecretMessageActivity.class);
buttonSecretMessage = (Button) findViewById(R.id.buttonSecretMessage);
buttonSecretMessage.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
EventBus.getInstance().post(new MakeMySecretMessageEvent());
startActivity(intentToMessage);
}
});
}
}
秘密消息活动:
public class SecretMessageActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_secret_message);
}
@Subscribe
public void getMySecretMessage(MakeMySecretMessageEvent event){
Toast.makeText(this, event.getMessage(), Toast.LENGTH_SHORT).show();
}
@Override
protected void onStart(){
super.onStart();
EventBus.getInstance().register(this);
}
@Override
protected void onStop() {
super.onStop();
//EventBus.getInstance().unregister(this);
}
}
MakeMySecretMessage 事件:
public class MakeMySecretMessageEvent {
public MakeMySecretMessageEvent() {
}
public String getMessage() {
String message = "YOU ARE AWESOME!";
return message;
}
}
事件总线:
public final class EventBus extends Bus{
private static final EventBus Bus = new EventBus();
public static Bus getInstance() {
return Bus;
}
private EventBus() {
}
}