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 }