Android笔记——判断程序是否第一次启动

 1 public class Welcome extends Activity {
 2     private final long SPLASH_LENGTH = 2000;
 3     Handler handler = new Handler();
 4
 5     public void onCreate(Bundle savedInstanceState) {
 6         super.onCreate(savedInstanceState);
 7         setContentView(R.layout.farst_img);
 8
 9         //定义一个setting记录APP是几次启动！！！
10         SharedPreferences setting = getSharedPreferences("com.example.hr_jie", 0);
11         Boolean user_first = setting.getBoolean("FIRST", true);
12         if (user_first) {// 第一次则跳转到欢迎页面
13             setting.edit().putBoolean("FIRST", false).commit();
14             tiaozhuanzhu();
15         } else {//如果是第二次启动则直接跳转到主页面
16             tiaozhuanfu();
17         }
18     }
19
20     public void tiaozhuanzhu(){
21     handler.postDelayed(new Runnable() {  //使用handler的postDelayed实现延时跳转
22
23             public void run() {
24                 Intent intent = new Intent(Welcome.this, Welcome_four.class);
25                 startActivity(intent);
26                 finish();
27             }
28         }, SPLASH_LENGTH);//2秒后跳转至应用主界面MainActivity
29 }
30
31     public void tiaozhuanfu(){
32     handler.postDelayed(new Runnable() {//使用handler的postDelayed实现延时跳转
33
34             public void run() {
35                 Intent intent = new Intent(Welcome.this, MainActivity.class);
36                 startActivity(intent);
37                 finish();
38             }
39         }, SPLASH_LENGTH);//2秒后跳转至应用欢迎界面
40 }
41 }