Android启动界面之SplashActivity的设计

本来觉得Android应用的启动界面就几秒钟，也就显示一张图片，判断一下用户是不是第一次使用，如果第一次使用就在进入主界面之前先进入引导界面，否则直接进入主界面，如果还想从服务器加载图片在UI线程中干也没太大问题，怎么说几行也就搞定了，但是，但是我竟然手贱的写了近130行，主要是进行了载入时间的判断、点击直接进入等操作，下面是源码：

public class SplashActivity extends Activity {    private static final int SHOW_TIME_MIN = 3000;    private static long mStartTime;    private static boolean isFirstUse;    private boolean isLoadingFinished;    private Handler mHandler = new SplashActivityHandler(this);    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_splash);        mStartTime = System.currentTimeMillis();        startLoadingTask();    }    @Override    public boolean onTouchEvent(MotionEvent event) {        if (event.getAction() == MotionEvent.ACTION_UP) {            if (isLoadingFinished) {                mHandler.sendMessage(mHandler.obtainMessage(2));            }        }        return super.onTouchEvent(event);    }    private void startLoadingTask() {        new LoadingTask().execute();    }    private class LoadingTask extends AsyncTask<Void, Void, Void> {        @Override        protected void onPreExecute() {            super.onPreExecute();        }        @Override        protected void onPostExecute(Void aVoid) {            super.onPostExecute(aVoid);            isLoadingFinished = true;            mHandler.sendMessage(mHandler.obtainMessage(1));        }        @Override        protected Void doInBackground(Void... params) {            SharedPreferences preferences = getSharedPreferences("user", Context.MODE_PRIVATE);            isFirstUse = preferences.getBoolean("isFirstUse", true);            try {                Thread.sleep(5000);            } catch (InterruptedException e) {                e.printStackTrace();            }            return null;        }    }    private static class SplashActivityHandler extends Handler {        WeakReference<SplashActivity> splashActivityWeakReference;        SplashActivityHandler(SplashActivity splashActivity) {            splashActivityWeakReference = new WeakReference<SplashActivity>(splashActivity);        }        @Override        public void handleMessage(android.os.Message msg) {            switch (msg.what) {                case 1:                    long loadingTime = System.currentTimeMillis() - mStartTime;                    if (loadingTime < SHOW_TIME_MIN) {                        postDelayed(switchActivity, SHOW_TIME_MIN                                - loadingTime);                    } else {                        post(switchActivity);                    }                    break;                case 2:                    if (switchActivity != null) {                        removeCallbacks(switchActivity);                    }                    post(switchActivity);                    break;                default:                    break;            }            removeMessages(1);        }        Runnable switchActivity = new Runnable() {            @Override            public void run() {                if (isFirstUse) {                    SplashActivity splashActivity = splashActivityWeakReference.get();                    SharedPreferences preferences = splashActivity.getSharedPreferences("user", Context.MODE_PRIVATE);                    SharedPreferences.Editor editor = preferences.edit();                    editor.putBoolean("isFirstUse", false);                    editor.commit();                    splashActivity.startActivity(new Intent(splashActivity,                            GuideActivity.class));                    splashActivity.finish();                } else {                    SplashActivity splashActivity = splashActivityWeakReference.get();                    splashActivity.startActivity(new Intent(splashActivity,                            MainActivity.class));                    splashActivity.finish();                }            }        };    }}

其中，利用线程睡眠5s来模仿访问服务器的耗时操作，如果时间短了会延时到3s进入（此时可以点击页面直接进入）。如果时间长了，例如10s，那么10s才进入。

如果代码有问题，还望各位指出，我好学习一下。

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