第一种方法

直接放进MainActivity中就行了

ImageView logoImage = (ImageView) this.findViewById(R.id.img);  
        AlphaAnimation alphaAnimation = new AlphaAnimation(0.1f, 1.0f);  
        alphaAnimation.setDuration(3000);  
        logoImage.startAnimation(alphaAnimation);  
        alphaAnimation.setAnimationListener(new AnimationListener() {  
            @Override  
            public void onAnimationStart(Animation animation) {  
            }  
            @Override  
            public void onAnimationRepeat(Animation animation) {  
            }  
            @Override  
            public void onAnimationEnd(Animation animation) {  
                Intent intent = new Intent();  
                intent.setClass(TongxunluActivity.this, LoginActivity.class);  
                startActivity(intent);  
                finish();  
            }  
        });```

>第二种方法

###新建一个SpinshDemo让此Activity跳转到主Activity中去（不要忘记注册新建的Activity）

public class SpinshDemo extends Activity {
private Thread newThread;
private long sleeptime = 3000;
private boolean ispause = false;
private boolean isSpinshActivity = true;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    // 设置全屏
    setondraweble();
    setContentView(R.layout.spinshmain);
    // 设置睡眠时间
    setSpinshTime();
}

private void setSpinshTime() {
    newThread = new Thread() {
        @Override
        public void run() {
            super.run();
            long ms = 0;
            try {
                while (isSpinshActivity && ms < sleeptime) {
                    sleep(100);
                    // 如果不再后台 那我们肯定是 增加睡眠时间的
                    if (!ispause) {
                        ms += 100;
                    }
                }
                startActivity(new Intent(SpinshDemo.this,
                        SpinshDemoActivity.class));
                Log.e("aaaaaaaaaaa", "enen跳转了");
            } catch (InterruptedException e) {
                e.printStackTrace();
            } finally {
                finish();
            }
            ;
        }
    };
    newThread.start();
}

private void setondraweble() {
    // 设置无标题
    requestWindowFeature(Window.FEATURE_NO_TITLE);
    // 设置全屏参数
    int flag = WindowManager.LayoutParams.FLAG_FULLSCREEN;
    // 获得window
    Window myWindow = this.getWindow();
    // 输出
    myWindow.setFlags(flag, flag);
}

// 暂停界面
@Override
protected void onPause() {
    super.onPause();
    ispause = true;
}

// 又回到这个界面
@Override
protected void onResume() {
    super.onResume();
    ispause = false;
}

}