Android：新线程可运行在主线程中执行

android multithreading java

2022-09-02 20:08:56

我试图在活动的onCreate（）中创建一个新线程，但不是创建新线程并在其中执行runnable的代码，而是在我的程序的主线程中执行可运行的代码。似乎从未创建新线程。

onCreate（）代码：

@Override
protected void onCreate(Bundle savedInstanceState){
    super.onCreate(savedInstanceState);
    setContentView(R.layout.monster_layout);
    runningMonsterViewActivity = this;
    Thread.currentThread().setName("Main Thread");
    Log.v(TAG, "onCreate() has run");
    Thread genThread = new Thread(new TestRunnable());
    genThread.run();
}

可运行的代码：

import android.os.Handler;
import android.util.Log;

public class TestRunnable implements Runnable{
String TAG = "TestRunnable";

    public TestRunnable()
    {
    //  mainThreadHandler = h;
    }
    @Override
    public void run() {
        for(int i=0; i < 1000; i++){
            Log.v(TAG, new Integer(i).toString());
            try {
                Thread.sleep(1000);
            } catch (InterruptedException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }

    }
}

我在代码执行时暂停代码时获得的堆栈跟踪：

DalvikVM[localhost:8621] (Suspended)    
    Thread [<1> Main Thread] (Suspended)    
        VMThread.sleep(long, int) line: not available [native method]   
        Thread.sleep(long, int) line: 1306  
        Thread.sleep(long) line: 1286   
        TestRunnable.run() line: 18 
        Thread.run() line: 1096 
        MonsterViewActivity.onCreate(Bundle) line: 49   
        Instrumentation.callActivityOnCreate(Activity, Bundle) line: 1047   
        ActivityThread.performLaunchActivity(ActivityThread$ActivityRecord, Intent) line: 2627  
        ActivityThread.handleLaunchActivity(ActivityThread$ActivityRecord, Intent) line: 2679   
        ActivityThread.access$2300(ActivityThread, ActivityThread$ActivityRecord, Intent) line: 125 
        ActivityThread$H.handleMessage(Message) line: 2033  
        ActivityThread$H(Handler).dispatchMessage(Message) line: 99 
        Looper.loop() line: 123 
        ActivityThread.main(String[]) line: 4627    
        Method.invokeNative(Object, Object[], Class, Class[], Class, int, boolean) line: not available [native method]  
        Method.invoke(Object, Object...) line: 521  
        ZygoteInit$MethodAndArgsCaller.run() line: 868  
        ZygoteInit.main(String[]) line: 626 
        NativeStart.main(String[]) line: not available [native method]  
    Thread [<6> Binder Thread #2] (Suspended)   
    Thread [<5> Binder Thread #1] (Suspended)   
    Daemon System Thread [<3> Signal Catcher] (Suspended)   
    Daemon System Thread [<2> HeapWorker] (Suspended)

答案 1

您只需要更改为genThread.run();genThread.start();

现在，您的代码从主线程调用该方法。将实际启动一个新线程，并将在该线程上执行该方法，这是所需的行为。run()start()run()

答案 2

您只需使用此代码段即可。

new Thread(new Runnable() 
{
    @Override
    public void run() 
    {
        //background task?
    }

}).start();