<p>開啟APP後第一個介面為歡迎介面，完畢後自動跳轉到主介面即功能介面。</p><p>通過handler傳送訊息的方式處理。</p><p>第一步：Handler裡面定義一個訊息，即完成歡迎介面後啟動主介面</p><p>第二步：在主執行緒裡面開個新的子執行緒 執行這個訊息即可。</p>

public class WelcomeActivity extends Activity {
	
	private Handler handler = new Handler(){

		@Override
		public void handleMessage(Message msg) {
			//歡迎介面完畢後啟動主介面
			Intent it = new Intent();
			it.setClass(WelcomeActivity.this, MainActivity.class);
			WelcomeActivity.this.startActivity(it);
			WelcomeActivity.this.finish();
		}		
	};
	
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		// TODO Auto-generated method stub
		super.onCreate(savedInstanceState);
		
		setContentView(R.layout.activity_welcome);
		
		new Thread(new Runnable() {			
			@Override
			public void run() {				
				try {
					Thread.sleep(3000);
				} catch (Exception e) {
					// TODO: handle exception
				}				
				handler.sendEmptyMessage(0);
			}
		}).start();
	}	
}