所以我目前在SharedPreferences内部的上下文中遇到了问题,它说LoginActivity.this。这是我的设备.java类,LoginActivity 是我想从中调用此方法的活动。那么它会像Device.This或类似的东西一样吗?
方法:
public void validateLogin(String username, String password, String ipAddress) {
SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(LoginActivity.this);
if (sharedPreferences.contains("ip") && sharedPreferences.contains("username") && sharedPreferences.contains("password")) {
String strUsername = sharedPreferences.getString("username", username);
String strPassword = sharedPreferences.getString("password", password);
String strIpAddress = sharedPreferences.getString("ip", ipAddress);
//performLogin(strUsername, strPassword, strIpAddress);
}
}
public void saveSP(String username, String password, String ipAddress) {
SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(LoginActivity.this);
sharedPreferences.edit()
.putString("ip", ipAddress)
.putString("username", username)
.putString("password", password)
.commit();
}
试试这个:
public class MyActivity extends Activity{
private static MyActivity activity;
@Override
protected void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
activity = this;
//...
}
public static MyActivity getActivity(){
return activity;
}
}
然后,当您需要上下文对象时:
PreferenceManager.getDefaultSharedPreferences(MyActivity.getActivity());
当我需要在 Activity 类之外使用上下文对象时,这是我的常用方法。 希望对您有所帮助!