runnable 什么时候在消息队列中执行？

Question

我知道 handler.post() 方法，导致 Runnable r 被添加到消息队列中。 runnable 将在附加此处理程序的线程上运行。

但我的问题是我在 onCreate() 方法中使用了 runtimer()

 public class Stopwatch extends Activity  {
private int seconds;
private boolean Running;
private boolean wasrunning;
@Override
protected void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_stopwatch);
 if (savedInstanceState != null){
    seconds = savedInstanceState.getInt("seconds");
    Running = savedInstanceState.getBoolean("running");
    wasrunning = savedInstanceState.getBoolean("wasrunning");
}
    runtimer();
}

public void start(View v)
{
    Running=true;
    wasrunning= true;
}
public void stop(View v)
{
    wasrunning=false;
 Running=false;
}

public void reset(View v){
seconds=0;
Running= false;
    wasrunning=false;
}

void runtimer(){
    final TextView tv = (TextView) findViewById(R.id.text);
final Handler h = new Handler();
h.post( new Runnable(){
@Override
public void run() {
    int hour = seconds / 3600;
    int minutes = (seconds % 3600) / 60;
    int sec = seconds % 60;
    String time = String.format("%02d:%02d:%02d", hour, minutes, sec);
    tv.setText(time);
    if (Running) {
        seconds++;
    }
    h.postDelayed(this,1000);
}
});
}

public void onSaveInstanceState(Bundle savedInstanceState){
    savedInstanceState.putInt("seconds",seconds);
    savedInstanceState.putBoolean("Running",Running);
    savedInstanceState.putBoolean("wasrunning",wasrunning);
}
}

Answer 1

消息队列中的runnable在onCreate()方法完成后是否执行

这将在onCreate() 方法返回之后的某个时间。确切的时间取决于主应用程序线程的消息队列中还有什么以及需要多长时间。