java - SharedPreferences 将不会被保存

Question

我正在尝试保存字符串哈哈，但一旦应用程序被销毁并重新启动，我似乎无法使其重新出现，我尝试了多种解决方案，但似乎没有一个对我有用，任何人都可以帮忙？

提前致谢

感谢爱琴海，我找到了解决方案。问题既不是保存也不是获取信息，而是事实是，一旦我检索了保存的信息，我就没有使用它。

代码如下所示:

public class MainActivity extends Activity {

public static final String GEMFFS = "dk.SimonPedersen.GEMFFS";



SharedPreferences ada;
SharedPreferences.Editor editor;
Button btnGem;
ToggleButton tbKon;
EditText etVaegt;
Double sex, vaegt, KT;
String lols, lolzor, KTO;
TextView haha;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    ada = getSharedPreferences(GEMFFS, 0);

    haha=(TextView)findViewById (R.id.haha);
    btnGem = (Button) findViewById (R.id.btnGem);
    tbKon = (ToggleButton) findViewById (R.id.tbKon);
    etVaegt = (EditText) findViewById (R.id.etVaegt);



    tbKon.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
        public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
            if (isChecked) {
                sex=0.7d;
            } else {
                sex=0.6d;
            }
           Log.d("Konskonstant", "sex" + sex);
        }
    });



    btnGem.setOnClickListener(new OnClickListener(){

        @Override
        public void onClick(View arg0) {
            // TODO Auto-generated method stub



            lols=etVaegt.getText().toString();
            vaegt=Double.parseDouble(lols);
            KT = sex*vaegt;
            lolzor=KT.toString();
            haha.setText("KT " + KT);
        }

});

}
protected void onStart(){
    super.onStart();
    SharedPreferences settings = getApplicationContext().getSharedPreferences(GEMFFS, 0);
    String KT = settings.getString("KT", null);
}
protected void onDestroy(){
    super.onDestroy();
    SharedPreferences settings = getApplicationContext().getSharedPreferences(GEMFFS, 0);
    SharedPreferences.Editor editor = settings.edit();
    editor.putString("KT", lolzor);
    editor.commit();
};
}

Answer 1

更改此:

protected void onStart(){
    super.onStart();
    SharedPreferences settings = getApplicationContext().getSharedPreferences(GEMFFS, 0);
    String KT = settings.getString("KT", null);
}

对此:

protected void onStart(){
    super.onStart();
    SharedPreferences settings = getApplicationContext().getSharedPreferences(GEMFFS, 0);
    KTO = settings.getString("KT", null);
    KT = Double.valueOf(KTO);

}

还可以在您想要的位置设置此值(到任何 TextView)

注意:您在保存和获取值(value)方面没有任何问题。唯一的问题是当你得到它时你并没有使用它。