Android程序开始的等候动画或LOGO

Android程序开始的等待动画或LOGO

在进入程序前，一般都要有一个欢迎图片LOGO或者动画，等待几秒后隐藏Logo或做Intent跳转：

可以使用HandlerThread新建一个线程来执行等待动作，也可以使用Android的TimerTask：

1.HandlerThread：

public class WelcomeAct extends Activity {protected static final String TAG = "WelcomeAct";private Handler handler; //因为要重写构造方法，所以不能用匿名内部类@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);// 设置登录无标题栏requestWindowFeature(Window.FEATURE_NO_TITLE);setContentView(R.layout.welcome);HandlerThread myThread = new HandlerThread("myHandlerThread");myThread.start();handler = new myHandler(myThread.getLooper());handler.post(new Runnable() {@Overridepublic void run() {try {//耗时的操作Thread.sleep(2500);//handler主要用于异步消息的处理,使用sendMessage()后，方法立即返回，Message放入消息队列，//等待Message出消息队列，由handlerMessage(Message msg)通知UI线程子线程已经挂起，并使用返回的msg。handler.sendMessage(handler.obtainMessage());} catch (InterruptedException e) {e.printStackTrace();}}});}class myHandler extends Handler{public myHandler(Looper looper) {super(looper);}//负责从消息队列中取消息给UI线程@Overridepublic void handleMessage(Message msg) {super.handleMessage(msg);Intent intent = new Intent(WelcomeAct.this, LoginAct.class);startActivity(intent);}}}

?2.使用TimerTask：

public class WelcomeAct extends Activity {protected static final int LOGINOVER = 0;protected static final String TAG = "WelcomeAct";private Handler handler; //因为要重写构造方法，所以不能用匿名内部类@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);// 设置登录无标题栏requestWindowFeature(Window.FEATURE_NO_TITLE);setContentView(R.layout.welcome);ProgressBar loading = (ProgressBar)findViewById(R.id.loading);loading.setVisibility(View.VISIBLE);HandlerThread myThread = new HandlerThread("myHandlerThread");myThread.start();handler = new Handler(){@Overridepublic void handleMessage(Message msg) {if(msg.what == LOGINOVER){Log.i(TAG, Thread.currentThread().getName());Intent intent = new Intent(WelcomeAct.this, LoginAct.class);startActivity(intent);}}};tt.run();}TimerTask tt = new TimerTask() {@Overridepublic void run() {Log.i(TAG, Thread.currentThread().getName());handler.sendMessageDelayed(handler.obtainMessage(LOGINOVER), 3000);}};}

也可设计为没有Intent跳转，使用View.setVisibility(View.GONE);和?View.VISIBLE来达到想要的效果。

使用TimerTask，打印线程名可以看出，系统没有新开线程，而且达到了阻塞等待的目的，代码量小，推荐用。