概念

当前应用程序在启动的时候都会有一个展示自己公司LOGO和APP名字的界面。这个界面成为SplashActivity。

布局

<?

xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" android:background="#ffffff"> <TextView android:id="@+id/copy_right" android:layout_width="wrap_content" android:layout_height="wrap_content" android:padding="12dip" android:layout_centerHorizontal="true" android:layout_alignParentBottom="true" android:text="by xxxxx 出品" android:textSize="11sp"/> <RelativeLayout android:layout_width="fill_parent" android:layout_height="fill_parent"> <LinearLayout android:layout_width="wrap_content" android:layout_height="wrap_content" android:orientation="vertical" android:layout_centerInParent="true"> <RelativeLayout android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center_horizontal"> <ImageView android:id="@+id/jay_studio_icon" android:layout_width="110dip" android:layout_height="130dip" android:src="@drawable/ic_launcher"/> <ImageView android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_toRightOf="@id/jay_studio_icon" android:src="@drawable/ic_launcher"/> </RelativeLayout> <LinearLayout android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center_horizontal"> <TextView android:id="@+id/app_name" android:layout_width="wrap_content" android:layout_height="wrap_content" android:padding="6dip" android:text="appname" android:textSize="24sp"/> <TextView android:id="@+id/version_name" android:layout_width="wrap_content" android:layout_height="fill_parent" android:gravity="bottom" android:paddingBottom="6dip" android:textSize="14sp"/> </LinearLayout> <View android:layout_width="fill_parent" android:layout_height="1px" android:layout_marginLeft="20dip" android:layout_marginRight="20dip" android:background="#dddddd"/> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center_horizontal" android:padding="6dip" android:text="传承历史" android:textSize="13sp"/> <ProgressBar android:id="@+id/refresh_list_footer_progressbar" android:layout_width="24dip" android:layout_height="24dip" android:layout_gravity="center"> </ProgressBar> </LinearLayout> </RelativeLayout> </RelativeLayout>

用异步任务做数据用作初始化

class MyAsyncTask extends AsyncTask<Void, Void, Integer> {

		@Override
		protected Integer doInBackground(Void... arg0) {
			int result;
			//请求数据
			result = loadingCache();
			return result;
		}

		@Override
		protected void onPostExecute(Integer result) {
			super.onPostExecute(result);
			//运行操作
		}

		public int loadingCache() {
			//推断网络
			ConnectivityManager manager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
			NetworkInfo info = manager.getActiveNetworkInfo();
			if (info == null) {
				return OFFLINE;
			}
			return SUCCESS;
		}
	}

	class MyAsyncTask extends AsyncTask<Void, Void, Integer> {

		@Override
		protected Integer doInBackground(Void... arg0) {
			int result;
			result = loadingCache();
			long startTime = System.currentTimeMillis();
			long loadingTime = System.currentTimeMillis() - startTime;
			if (loadingTime < SHOW_TIME_MIN) {
				try {
					Thread.sleep(SHOW_TIME_MIN - loadingTime);
				} catch (InterruptedException e) {
					e.printStackTrace();
				}
			}
			return result;
		}

		@Override
		protected void onPostExecute(Integer result) {
			super.onPostExecute(result);
			Intent intent = new Intent(SplashActivity.this, NextActivity.class);
			startActivity(intent);
			finish();
			overridePendingTransition(R.anim.fade_in, R.anim.fade_out);
		}

		public int loadingCache() {
			
			ConnectivityManager manager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
			NetworkInfo info = manager.getActiveNetworkInfo();
			if (info == null) {
				return OFFLINE;
			}
			return SUCCESS;
		}
	}

	private static final int FAILURE = 0; // 失败
	private static final int SUCCESS = 1; // 成功
	private static final int OFFLINE = 2; // 假设支持离线阅读，进入离线模式
	private static final int SHOW_TIME_MIN = 2000;
	
	
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		new MyAsyncTask().execute();
	}

进入

<?

xml version="1.0" encoding="utf-8"?> <set xmlns:android="http://schemas.android.com/apk/res/android" android:shareInterpolator="false"> <alpha android:fromAlpha="0" android:toAlpha="1" android:duration="2000" /> </set>

离开

<?xml version="1.0" encoding="utf-8"?> 
<set xmlns:android="http://schemas.android.com/apk/res/android"
    android:shareInterpolator="false"> 
    <alpha 
        android:fromAlpha="1"
        android:toAlpha="0"
        android:duration="2000" /> 
</set>