对于下面的代码,我正在尝试检索共享首选项,我认为它已经保存正确了,但是当我返回到登录屏幕时,所有数据都消失了。我需要在返回到此屏幕时保留它。 所以我在个人资料页面上单独输入姓名、年龄和ID。 然后我按保存按钮 然后通过操作栏上的“返回”按钮返回上一页。 当我回到个人资料页面时,我的信息应该仍然存在,但实际上并没有。 有什么帮助吗?
package com.example.myprofile;
import android.content.Context;
import android.content.SharedPreferences;
import android.preference.PreferenceManager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
import java.sql.Savepoint;
public class Profile extends AppCompatActivity {
protected EditText NameEditText;
protected EditText AgeEditText;
protected EditText IDEditText;
protected Button saveButton;
protected Button settings_id;
String name;
String age;
String id;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_profile);
EditText mEdit = (EditText) findViewById(R.id.NameEditText);
mEdit.setEnabled(false);
EditText mEdit1 = (EditText) findViewById(R.id.AgeEditText);
mEdit1.setEnabled(false);
EditText mEdit2 = (EditText) findViewById(R.id.IDEditText);
mEdit2.setEnabled(false);
NameEditText = (EditText) findViewById(R.id.NameEditText);
AgeEditText = (EditText) findViewById(R.id.AgeEditText);
IDEditText = (EditText) findViewById(R.id.IDEditText);
settings_id = (Button) findViewById(R.id.settings_id);
saveButton = (Button) findViewById(R.id.SaveButton);
SharedPreferences prefs = getSharedPreferences(getString(R.string.ProfileName), Context.MODE_PRIVATE);
name = prefs.getString("userName", "");
age = prefs.getString("userAge", "");
id = prefs.getString("userID", "");
saveButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
String name = NameEditText.getText().toString();
String age = AgeEditText.getText().toString();
String id = IDEditText.getText().toString();
SharedPreferences sharedPreferences = getSharedPreferences(getString(R.string.ProfileName), Context.MODE_PRIVATE);
SharedPreferences.Editor editor = sharedPreferences.edit();
editor.putString(getString(R.string.ProfileName), name);
editor.putString(getString(R.string.ProfileAge), age);
editor.putString(getString(R.string.ProfileID), id);
editor.apply();
if (Integer.parseInt(age) < 18)
{
Toast toast1 = Toast.makeText(getApplicationContext(), "Invalid Age", Toast.LENGTH_LONG);
toast1.show();
}
else if (!name.isEmpty() && !age.isEmpty() && !id.isEmpty())
{
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
Toast toast = Toast.makeText(getApplicationContext(), "Name Saved!", Toast.LENGTH_LONG);
toast.show();
}
else
{
Toast toast2 = Toast.makeText(getApplicationContext(), "Incomplete Info", Toast.LENGTH_LONG);
toast2.show();
}
}
});
getSupportActionBar().setDisplayHomeAsUpEnabled(false);
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.settings_id:
{
EditText mEdit = (EditText) findViewById(R.id.NameEditText);
mEdit.setEnabled(true);
EditText mEdit1 = (EditText) findViewById(R.id.AgeEditText);
mEdit1.setEnabled(true);
EditText mEdit2 = (EditText) findViewById(R.id.IDEditText);
mEdit2.setEnabled(true);
saveButton.setEnabled(Boolean.parseBoolean("True"));
}
default:
return super.onOptionsItemSelected(item);
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.menu, menu);
return true;
}
}