将来自EditText的数字输入保存到SharedPreferences中 [英] Save number input from EditText into SharedPreferences

问题描述

我已经在寻找解决此问题的方法，但似乎没有任何效果.我想将输入从EditText保存到SharedPreferences，当我返回页面时，我希望该输入保持在那里直到清除.

I have searched for solutions to this problem but none seem to work. I want to save an input from EditText to SharedPreferences and when I return to the page I would like that input to remain there until cleared.

我已经尝试过这样做，但无法正常工作，我不确定为什么

I have tried to do it like this but it won't work and I am unsure why

protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_data);
        loadStepPref();


final Button saveStepLength = (Button) findViewById(R.id.saveStepButton);
        if(saveStepLength != null) {
            saveStepLength.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    EditText editText = (EditText) findViewById(R.id.editStepLength);
                    saveStepLength.setVisibility(View.GONE);
                    //Hide keypad
                    InputMethodManager imm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
                    imm.hideSoftInputFromWindow(editText.getWindowToken(), 0);
                    saveStepPref("editStepLength", null);
                }
            });
        }

 private void loadStepPref() {
        EditText inputStepLength = (EditText) findViewById(R.id.editStepLength);
        SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(this);
        String value = sp.getString("editStepLength", null);
        inputStepLength.setText(value);
    }

    private void saveStepPref(String key, String value){
        SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(this);
        SharedPreferences.Editor edit = sp.edit();
        edit.putString(key, value);
        edit.apply();
    }
}

这是xml的部分:

<TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceLarge"
        android:text="@string/step_length_data"
        android:id="@+id/textView12"
        android:layout_gravity="center_horizontal"
        android:layout_marginTop="41dp"
        android:layout_alignParentTop="true"
        android:layout_toStartOf="@+id/returnHomeButton" />
    <EditText
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_toEndOf="@id/textView12"
        android:inputType="number"
        android:layout_alignBottom="@id/textView12"
        android:id="@+id/editStepLength"
        android:hint = "@string/step_length_entry"/>

    <Button
        style="?android:attr/buttonStyleSmall"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/save"
        android:id="@+id/saveStepButton"
        android:layout_alignTop="@+id/editStepLength"
        android:layout_toEndOf="@+id/editStepLength" />

推荐答案

您永远都无法使用它，因为您总是保存null！

You never get it work .. because you are saving null always !

 saveStepPref("editStepLength", null);

将其更改为

 saveStepPref("editStepLength", edittext.getText().toString());

这篇关于将来自EditText的数字输入保存到SharedPreferences中的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！