判断是否第一次进入应用

   判断是否第一次进入应用，以决定是否启动引导页。

   这个都用常规方法，使用SharePreference进行保存变量，然后每次进入应用时首先先检测变量的值，来决定是否启动引导页

 代码如下：

public class SplashActivity extends Activity {  @Override  protected void onCreate(Bundle savedInstanceState) {  super.onCreate(savedInstanceState);  //setContentView(R.layout.activity_splash);  boolean mFirst = isFirstEnter(SplashActivity.this,SplashActivity.this.getClass().getName());  Toast.makeText(this, mFirst+"", Toast.LENGTH_SHORT).show();  if(mFirst)  mHandler.sendEmptyMessageDelayed(SWITCH_GUIDACTIVITY,100);  else  mHandler.sendEmptyMessageDelayed(SWITCH_MAINACTIVITY,100);  SharedPreferences sharedPreferences= this.getSharedPreferences("my_pref", MODE_PRIVATE);  sharedPreferences.edit().putString("guide_activity", "false").commit();  }     private static final String SHAREDPREFERENCES_NAME = "my_pref";  private static final String KEY_GUIDE_ACTIVITY = "guide_activity";  private boolean isFirstEnter(Context context,String className){  if(context==null || className==null||"".equalsIgnoreCase(className))return false;  String mResultStr = context.getSharedPreferences(SHAREDPREFERENCES_NAME, Context.MODE_WORLD_READABLE)  .getString(KEY_GUIDE_ACTIVITY, "");//取得所有类名 如 com.my.MainActivity  if(mResultStr.equalsIgnoreCase("false"))  return false;  else  return true;  }  private final static int SWITCH_MAINACTIVITY = 1000;  private final static int SWITCH_GUIDACTIVITY = 1001;  public Handler mHandler = new Handler(){  public void handleMessage(Message msg) {  switch(msg.what){  case SWITCH_MAINACTIVITY:  Intent mIntent = new Intent();  mIntent.setClass(SplashActivity.this, Welcome.class);  SplashActivity.this.startActivity(mIntent);  SplashActivity.this.finish();  break;  case SWITCH_GUIDACTIVITY:  mIntent = new Intent();  mIntent.setClass(SplashActivity.this, GuideActivity.class);  SplashActivity.this.startActivity(mIntent);  SplashActivity.this.finish();  break;  }  super.handleMessage(msg);  }  };  
}  

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