app 欢迎界面

欢迎界面的原理就是两个界面的动态切换（欢迎界面 暂停几秒 自动跳到 主界面）

方法一

在onResume中发送一个延迟消息 接收到消息之后跳转

@Override
protected void onResume() {
// TODO Auto-generated method stub
super.onResume();
mHandler.sendEmptyMessageDelayed(GO_LOGIN, 2000);
}


@SuppressLint("HandlerLeak")
private Handler mHandler = new Handler() {
@Override
public void handleMessage(Message msg) {
switch (msg.what) {
case GO_LOGIN:
Intent intent = new Intent(WelcomeActivity.this,
MainActivity.class);
startActivity(intent);
finish();
break;
}
}
};

第二种 使用android 提供的AlphaAnimation动画

这个可以添加一张图片让他动态显示出来

public void init() {

AlphaAnimation localAlphaAnimation = new AlphaAnimation(0.0F, 1.0F);
localAlphaAnimation
.setAnimationListener(new Animation.AnimationListener() {
public void onAnimationEnd(Animation paramAnimation) {
Intent localIntent = new Intent(WelcomeActivity.this
.getApplicationContext(), MainActivity.class);
WelcomeActivity.this.startActivity(localIntent);
WelcomeActivity.this.finish();
}


public void onAnimationRepeat(Animation paramAnimation) {
}


public void onAnimationStart(Animation paramAnimation) {
}
});
((ImageView) findViewById(R.id.welcome_image))
.startAnimation(localAlphaAnimation);
localAlphaAnimation.setDuration(3000L);
localAlphaAnimation.start();
}