Why does the toast only show an empty string or whatever I input as the "default" value on the getString line
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
SharedPreferences sharedPreferences = this.getSharedPreferences("com.example.stefan.dijeljenepreference", Context.MODE_PRIVATE);
sharedPreferences.edit().putString("username", "stefan");
String username = sharedPreferences.getString("username","");
Toast.makeText(this,"username:" + username, Toast.LENGTH_SHORT).show();
}
您应该使用如下的apply()方法保存所做的编辑
sharedPreferences.edit().putString("username", "stefan").apply();
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