Android开发笔记之:Splash的实现详解

        <activity android:name=".SplashActivity"
                  android:theme="@android:style/Theme.NoTitleBar.Fullscreen"
                  android:noHistory="true"
                  android:configChanges="orientation|keyboardHidden"
                  android:label="@string/app_name">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

public class SplashActivity extends Activity {
    private Handler mMainHandler = new Handler() {
 @Override
 public void handleMessage(Message msg) {
     Intent intent = new Intent(Intent.ACTION_MAIN);
     intent.setClass(getApplication(), NotTomorrowActivity.class);
     intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
     startActivity(intent);
     // overridePendingTransition must be called AFTER finish() or startActivity, or it won't work.
     overridePendingTransition(R.anim.activity_in, R.anim.splash_out);
 }
    };

    @Override
    public void onCreate(Bundle icicle) {
 super.onCreate(icicle);
 getWindow().setBackgroundDrawableResource(R.drawable.kg);
 mMainHandler.sendEmptyMessageDelayed(0, 5000);
    }

    // much easier to handle key events
    @Override
    public void onBackPressed() {
    }
}

<?xml version="1.0" encoding="utf-8"?>
<ViewSwitcher xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/view_container"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:inAnimation="@anim/activity_in"
    android:outAnimation="@anim/splash_out">
    <ImageView android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:src="@drawable/kg"
        android:scaleType="fitXY"/>
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
     android:orientation="vertical"
     android:layout_width="fill_parent"
     android:layout_height="fill_parent" >
  <TextView android:id="@+id/header"
      style="@style/header_text" />
     <TextView android:id="@+id/header_tip"
         style="@style/task_text" />
  <ListView android:id="@+id/task_list"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
     android:footerDividersEnabled="true"
     android:background="@color/white"/>
 </LinearLayout>
</ViewSwitcher>

public class NotTomorrowActivity extends Activity {
    protected static final String TAG = "NoTomorrowActivity";
    protected static final int MSG_SHOW_LAYOUT = 10;
    private static final int MENU_ADD_TASK = 0;
    private Handler mMainHandler = new Handler() {
 @Override
 public void handleMessage(Message msg) {
     switch (msg.what) {
     case MSG_SHOW_LAYOUT:
  final ViewSwitcher container = (ViewSwitcher) findViewById(R.id.view_container);
  container.showNext();
  ImageView view = (ImageView) container.getChildAt(0);
  view.setImageResource(0);
  container.removeViewAt(0);
  mSplashing = false;
  break;
     default:
  break;
     }
 }
    };
    private boolean mSplashing;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        mSplashing = true;
        setContentView(R.layout.not_tomorrow_activity);
        mMainHandler.sendEmptyMessageDelayed(MSG_SHOW_LAYOUT, 5000);  
    }
       @Override
    public void onBackPressed() {
 if (!mSplashing) {
     super.onBackPressed();
 }
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
 if (mSplashing) {
     return false;
 }
 menu.add(0, MENU_ADD_TASK, 0, R.string.add_hint);
 return super.onCreateOptionsMenu(menu);
    }

    @Override
    public boolean onPrepareOptionsMenu(Menu menu) {
 if (mSplashing) {
     return false;
 }
 return super.onPrepareOptionsMenu(menu);
    }
}