首屏动画及验证网络状态跳转

public class tween extends Activity {
    // 声明ImageView对象
    ImageView imageView;
    // 声明TextView
    TextView textView;
    // ImageView的alpha值
    int image_alpha = 0;
    // Handler对象用来给UI_Thread的MessageQueue发送消息
    Handler mHandler;
    // 线程是否运行判断变量
    boolean isrung = false;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        setContentView(R.layout.tween);
        SysApplication.getInstance().addActivity(this);
        final Context con=this.getApplicationContext();
        isrung = true;
        // 获得ImageView的对象
        imageView = (ImageView) this.findViewById(R.id.img);
        textView = (TextView) this.findViewById(R.id.tvgc);
       // 设置imageView的Alpha值
        imageView.setAlpha(image_alpha);
        textView.setAlpha(image_alpha);
        // 开启一个线程来让Alpha值递减
        new Thread(new Runnable() {
            @Override
            public  void run() {
                while (isrung) {
                    try {
                        Thread.sleep(200);
                        // 更新Alpha值
                        updateAlpha();
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }} }
        }).start();
        // 接受消息之后更新imageview视图
        mHandler = new Handler() {
            @Override
            public void handleMessage(Message msg) {
                super.handleMessage(msg);
                imageView.setAlpha(image_alpha);
                // 设置textview显示当前的Alpha值
                textView.setAlpha(image_alpha);
                // 刷新视图
                imageView.invalidate();
              try{
                  if(image_alpha==255)
                  {
                isNetworkConnected(con);
                }
                  }
              catch(Exception e){}

            } };}
    // 更新Alpha
    public void updateAlpha() {
        if (image_alpha +7<= 255) {
            image_alpha += 7;
        }
        else {
               image_alpha = 255;
               isrung = false;  }
        // 发送需要更新imageview视图的消息-->这里是发给主线程
        mHandler.sendMessage(mHandler.obtainMessage());

}
    public void isNetworkConnected(Context context)  {
        if (context != null) {
             ConnectivityManager mConnectivityManager = (ConnectivityManager)context
                .getSystemService(Context.CONNECTIVITY_SERVICE);
             NetworkInfo mNetworkInfo = mConnectivityManager.getActiveNetworkInfo();
           if (mNetworkInfo != null) {
               NetworkInfo mWiFiNetworkInfo = mConnectivityManager.getNetworkInfo(ConnectivityManager.TYPE_WIFI);
               NetworkInfo mMobileNetworkInfo = mConnectivityManager.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);
              if(!mWiFiNetworkInfo.isConnected()){
               Toast.makeText(tween.this, "提示：当前处于运营商网络", Toast.LENGTH_SHORT).show(); }
              Intent it = new Intent();
              it.setClass(tween.this,tabhost.class);
              startActivity(it);

           }
           else{
               Toast.makeText(tween.this, "当前网络连接不可用！", Toast.LENGTH_SHORT).show();
            }}
          }
}