像在ios中引导页就第一次出现，之后都不会出现，一般都是使用NSUserDefault来保存一个数据。在Android中使用SharedPreferences。
安卓中欢迎界面也是自己写，那么就需要在欢迎页面指定跳转到哪里。
Handler有和多线程一样的功能，执行方法：
public class WelcomeAct extends Activity{
private boolean isFirstIn = false;
private static final int TIME = 2000;
private static final int GO_HOME = 1000;
private static final int GO_GUIDE = 1001;
private Handler mHandler = new Handler(){
@Override
public void handleMessage(Message msg) {
switch (msg.what){
case GO_HOME:
goHome();
break;
case GO_GUIDE:
goGuide();
break;
}
}
};
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.welcome);
init();
}
private void init(){
SharedPreferences perPreferences = getSharedPreferences("jike",MODE_PRIVATE);
isFirstIn = perPreferences.getBoolean("isFirstIn",true);
if (!isFirstIn){
mHandler.sendEmptyMessageDelayed(GO_HOME,TIME);
}else{
mHandler.sendEmptyMessageDelayed(GO_GUIDE,TIME);
SharedPreferences.Editor editor = perPreferences.edit();
editor.putBoolean("isFirstIn",false);
editor.commit();
}
}
private void goHome(){
Intent i = new Intent(WelcomeAct.this,MainActivity.class);
startActivity(i);
finish();
}
private void goGuide(){
Intent i = new Intent(WelcomeAct.this,Guide.class);
startActivity(i);
finish();
}
}
根据存储的isFirst来判断跳转到哪里。
