java使用共享首选项在单击按钮时保存数据
我正在进行一项活动，我的目标是通过单击“保存”按钮向我显示数据、输入的值，然后单击“编辑”按钮允许我编辑数据、保存的值。我有一些文本视图和编辑文本以及两个按钮
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public class MyInfo extends AppCompatActivity {
SharedPreferences sharedpreferences;
TextView name;
TextView address;
TextView firstContactName;
TextView firstContactPhoneNumber;
TextView secondContactName;
TextView secondContactPhoneNumber;
public static final String mypreference = "mypref";
public static final String Name = "nameKey";
public static final String Address = "addressKey";
public static final String FirstContactName = "firstContactNameKey";
public static final String SecondContactName = "secondContactNameKey";
public static final String FirstContactPhoneNumber = "firstContactPhoneNumberKey";
public static final String SecondContactPhoneNumber = "secondContactPhoneNumber";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_my_info);
name = (TextView) findViewById(R.id.edit_text_my_name);
address = (TextView) findViewById(R.id.edit_text_my_address);
firstContactName = (TextView) findViewById(R.id.edit_text_first_contact_name);
firstContactPhoneNumber = (TextView) findViewById(R.id.edit_text_first_contact_phone);
secondContactName = (TextView) findViewById(R.id.edit_text_second_contact_name);
secondContactPhoneNumber = (TextView) findViewById(R.id.edit_text_second_contact_phone);
sharedpreferences = getSharedPreferences(mypreference,
Context.MODE_PRIVATE);
if (sharedpreferences.contains(Name)) {
name.setText(sharedpreferences.getString(Name, ""));
}
if (sharedpreferences.contains(Address)) {
address.setText(sharedpreferences.getString(Address, ""));
}
if (sharedpreferences.contains(FirstContactName)) {
firstContactName.setText(sharedpreferences.getString(FirstContactName, ""));
}
if (sharedpreferences.contains(FirstContactPhoneNumber)) {
firstContactPhoneNumber.setText(sharedpreferences.getString(FirstContactPhoneNumber, ""));
}
if (sharedpreferences.contains(SecondContactName)) {
secondContactName.setText(sharedpreferences.getString(SecondContactName, ""));
}
if (sharedpreferences.contains(SecondContactPhoneNumber)) {
secondContactPhoneNumber.setText(sharedpreferences.getString(SecondContactPhoneNumber, ""));
}
}
public void Save(View view) {
String n = name.getText().toString();
String a = address.getText().toString();
String fcn = firstContactName.getText().toString();
String fcpn = firstContactPhoneNumber.getText().toString();
String scn = secondContactName.getText().toString();
String scpn = secondContactPhoneNumber.getText().toString();
SharedPreferences.Editor editor = sharedpreferences.edit();
editor.putString(Name, n);
editor.putString(Address, a);
editor.putString(FirstContactName, fcn);
editor.putString(FirstContactPhoneNumber, fcpn);
editor.putString(SecondContactName, scn);
editor.putString(SecondContactPhoneNumber, scpn);
editor.apply();
name = (TextView) findViewById(R.id.edit_text_my_name);
address = (TextView) findViewById(R.id.edit_text_my_address);
firstContactName = (TextView) findViewById(R.id.edit_text_first_contact_name);
firstContactPhoneNumber = (TextView) findViewById(R.id.edit_text_first_contact_phone);
secondContactName = (TextView) findViewById(R.id.edit_text_second_contact_name);
secondContactPhoneNumber = (TextView) findViewById(R.id.edit_text_second_contact_phone);
sharedpreferences = getSharedPreferences(mypreference,
Context.MODE_PRIVATE);
if (sharedpreferences.contains(Name)) {
name.setText(sharedpreferences.getString(Name, ""));
}
if (sharedpreferences.contains(Address)) {
address.setText(sharedpreferences.getString(Address, ""));
}
if (sharedpreferences.contains(FirstContactName)) {
firstContactName.setText(sharedpreferences.getString(FirstContactName, ""));
}
if (sharedpreferences.contains(FirstContactPhoneNumber)) {
firstContactPhoneNumber.setText(sharedpreferences.getString(FirstContactPhoneNumber, ""));
}
if (sharedpreferences.contains(SecondContactName)) {
secondContactName.setText(sharedpreferences.getString(SecondContactName, ""));
}
if (sharedpreferences.contains(SecondContactPhoneNumber)) {
secondContactPhoneNumber.setText(sharedpreferences.getString(SecondContactPhoneNumber, ""));
}
}
}
´´´
我已经考虑过了，但是我不能让它工作，我不知道我的java代码出了什么问题
'
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:安卓="http://schemas.安卓.com/apk/res/安卓"
xmlns:app="http://schemas.安卓.com/apk/res-auto"
xmlns:tools="http://schemas.安卓.com/tools"
安卓:layout_width="match_parent"
安卓:layout_height="match_parent"
安卓:paddingLeft="@dimen/padding_left_right"
安卓:paddingRight="@dimen/padding_left_right"
安卓:paddingTop="@dimen/padding_top_bottom"
安卓:paddingBottom="@dimen/padding_top_bottom"
安卓:orientation="vertical"
tools:context=".MyInfo">
<TextView
安卓:id="@+id/text_view_my_name"
安卓:layout_width="match_parent"
安卓:layout_height="wrap_content"
安卓:text="@string/my_name"
安卓:textAlignment="center"
安卓:layout_gravity="center_horizontal"/>
<EditText
安卓:id="@+id/edit_text_my_name"
安卓:layout_width="match_parent"
安卓:layout_height="wrap_content" />
<TextView
安卓:id="@+id/text_view_my_address"
安卓:layout_width="match_parent"
安卓:layout_height="wrap_content"
安卓:text="@string/my_address"
安卓:textAlignment="center"
安卓:layout_gravity="center_horizontal" />
<EditText
安卓:id="@+id/edit_text_my_address"
安卓:layout_width="match_parent"
安卓:layout_height="wrap_content" />
<TextView
安卓:id="@+id/text_view_first_contact_name"
安卓:layout_width="match_parent"
安卓:layout_height="wrap_content"
安卓:text="@string/first_contact_name"
安卓:textAlignment="center"
安卓:layout_gravity="center_horizontal" />
<EditText
安卓:id="@+id/edit_text_first_contact_name"
安卓:layout_width="match_parent"
安卓:layout_height="wrap_content" />
<TextView
安卓:id="@+id/text_view_first_contact_phone"
安卓:layout_width="match_parent"
安卓:layout_height="wrap_content"
安卓:text="@string/first_contact_phone"
安卓:textAlignment="center"
安卓:layout_gravity="center_horizontal" />
<EditText
安卓:id="@+id/edit_text_first_contact_phone"
安卓:layout_width="match_parent"
安卓:layout_height="wrap_content" />
<TextView
安卓:id="@+id/text_view_second_contact_name"
安卓:layout_width="match_parent"
安卓:layout_height="wrap_content"
安卓:text="@string/second_contact_name"
安卓:textAlignment="center"
安卓:layout_gravity="center_horizontal" />
<EditText
安卓:id="@+id/edit_text_second_contact_name"
安卓:layout_width="match_parent"
安卓:layout_height="wrap_content" />
<TextView
安卓:id="@+id/text_view_second_contact_phone"
安卓:layout_width="match_parent"
安卓:layout_height="wrap_content"
安卓:text="@string/second_contact_phone"
安卓:textAlignment="center"
安卓:layout_gravity="center_horizontal" />
<EditText
安卓:id="@+id/edit_text_second_contact_phone"
安卓:layout_width="match_parent"
安卓:layout_height="wrap_content" />
<LinearLayout
安卓:layout_width="wrap_content"
安卓:layout_height="wrap_content"
安卓:orientation="horizontal"
安卓:layout_gravity="center">
<Button
安卓:id="@+id/edit_button"
安卓:layout_width="match_parent"
安卓:layout_height="wrap_content"
安卓:onClick="Clear"
安卓:text="@string/edit_button" />
<Button
安卓:id="@+id/save_button"
安卓:layout_width="match_parent"
安卓:layout_height="wrap_content"
安卓:onClick="Save"
安卓:text="@string/save_button" />
</LinearLayout>
</LinearLayout>
'
# 1 楼答案
你所有的文本字符串似乎都来自“文本视图”。我看不到要编辑值的“编辑文本”。将要编辑的值更改为显示在“EditText”而不是“TextView”中
# 2 楼答案
首先初始化小部件，然后保存共享优先权上的值