Android笔记——判断程序是否第一次启动

public class Welcome extends Activity {
private final long SPLASH_LENGTH = 2000;
Handler handler = new Handler(); public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.farst_img); //定义一个setting记录APP是几次启动！！！
SharedPreferences setting = getSharedPreferences("com.example.hr_jie", 0);
Boolean user_first = setting.getBoolean("FIRST", true);
if (user_first) {// 第一次则跳转到欢迎页面
setting.edit().putBoolean("FIRST", false).commit();
tiaozhuanzhu();
} else {//如果是第二次启动则直接跳转到主页面
tiaozhuanfu();
}
} public void tiaozhuanzhu(){
handler.postDelayed(new Runnable() { //使用handler的postDelayed实现延时跳转 public void run() {
Intent intent = new Intent(Welcome.this, Welcome_four.class);
startActivity(intent);
finish();
}
}, SPLASH_LENGTH);//2秒后跳转至应用主界面MainActivity
} public void tiaozhuanfu(){
handler.postDelayed(new Runnable() {//使用handler的postDelayed实现延时跳转 public void run() {
Intent intent = new Intent(Welcome.this, MainActivity.class);
startActivity(intent);
finish();
}
}, SPLASH_LENGTH);//2秒后跳转至应用欢迎界面
}
}