Java 将数据保存在SharedReference中,尽管按下了后退按钮-Android Studio
正如我在问题中提到的,我有一些问题。我有两个活动,活动A和活动B。当我在活动A中输入一些数据时,我按下下一步按钮,它将重定向到活动B。在活动B中,我也输入一些数据。当我按下后退按钮时,活动A中的数据显示为我之前输入的数据。当我按下“下一步”按钮时,我在活动B中输入的数据丢失。下面是我的Java 将数据保存在SharedReference中,尽管按下了后退按钮-Android Studio,java,android,sharedpreferences,Java,Android,Sharedpreferences,正如我在问题中提到的,我有一些问题。我有两个活动,活动A和活动B。当我在活动A中输入一些数据时,我按下下一步按钮,它将重定向到活动B。在活动B中,我也输入一些数据。当我按下后退按钮时,活动A中的数据显示为我之前输入的数据。当我按下“下一步”按钮时,我在活动B中输入的数据丢失。下面是我的SharedReferencescode 活动A: public class NewSuggestion2 extends AppCompatActivity { private EditText etPrese
SharedReferences
code
活动A:
public class NewSuggestion2 extends AppCompatActivity {
private EditText etPresent, etDetails, etBenefit;
private ImageView imgAttach,btnCamera,btnGallery;
private Button btnNext,btnClear;
private Intent intent;
private Bitmap bitmap;
private int REQUEST_CODE = 1;
public static final int RequestPermissionCode = 1 ;
public static final String DEFAULT = "N/A";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_new_suggestion2);
final ActionBar abar = getSupportActionBar();
View viewActionBar = getLayoutInflater().inflate(R.layout.activity_new_suggestion, null);
ActionBar.LayoutParams params = new ActionBar.LayoutParams(//Center the textview in the ActionBar !
ActionBar.LayoutParams.WRAP_CONTENT,
ActionBar.LayoutParams.MATCH_PARENT,
Gravity.CENTER);
TextView tvTitle = viewActionBar.findViewById(R.id.title);
tvTitle.setText("NEW SUGGESTION (Cont..)");
abar.setCustomView(viewActionBar, params);
abar.setDisplayShowCustomEnabled(true);
abar.setDisplayShowTitleEnabled(false);
//abar.setDisplayHomeAsUpEnabled(true);
abar.setHomeButtonEnabled(true);
etPresent = findViewById(R.id.etPresent);
etDetails = findViewById(R.id.etDetails);
etBenefit = findViewById(R.id.etBenefit);
imgAttach = findViewById(R.id.imgAttach);
btnCamera=findViewById(R.id.btnCamera);
EnableRuntimePermission();
btnCamera.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
intent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
startActivityForResult(intent, 7);
}
});
btnGallery=findViewById(R.id.btnGallery);
btnGallery.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent intent = new Intent();
intent.setType("image/*");
intent.setAction(Intent.ACTION_GET_CONTENT);
startActivityForResult(Intent.createChooser(intent,"Select Photo"),REQUEST_CODE);
}
});
btnNext = findViewById(R.id.btnNext);
btnNext.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
SharedPreferences sharedPref = getSharedPreferences("MyData", MODE_PRIVATE);
SharedPreferences.Editor editor = sharedPref.edit();
editor.putString("present", etPresent.getText().toString());
editor.putString("details", etDetails.getText().toString());
editor.putString("benefit", etBenefit.getText().toString());
editor.apply();
Intent intent = new Intent(NewSuggestion2.this,ConfirmSuggestion.class);
startActivity(intent);
}
});
btnClear = findViewById(R.id.btnClear);
btnClear.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
imgAttach.setImageBitmap(null);
}
});
}
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == 7 && resultCode == RESULT_OK) {
Bitmap bitmap = (Bitmap) data.getExtras().get("data");
imgAttach.setImageBitmap(bitmap);
}
if(requestCode == REQUEST_CODE && resultCode == RESULT_OK && data != null && data.getData() != null){
Uri uri = data.getData();
try{
Bitmap bitmap = MediaStore.Images.Media.getBitmap(getContentResolver(), uri);
imgAttach.setImageBitmap(bitmap);
}catch (IOException e){
e.printStackTrace();
}
}
}
public void EnableRuntimePermission(){
if (ActivityCompat.shouldShowRequestPermissionRationale(NewSuggestion2.this,
Manifest.permission.CAMERA))
{
Toast.makeText(NewSuggestion2.this,"CAMERA permission allows us to Access CAMERA app", Toast.LENGTH_LONG).show();
} else {
ActivityCompat.requestPermissions(NewSuggestion2.this,new String[]{
Manifest.permission.CAMERA}, RequestPermissionCode);
}
}
@Override
public void onRequestPermissionsResult(int RC, String per[], int[] PResult) {
switch (RC) {
case RequestPermissionCode:
if (PResult.length > 0 && PResult[0] == PackageManager.PERMISSION_GRANTED) {
Toast.makeText(NewSuggestion2.this,"Permission Granted, Now your application can access CAMERA.", Toast.LENGTH_LONG).show();
} else {
Toast.makeText(NewSuggestion2.this,"Permission Canceled, Now your application cannot access CAMERA.", Toast.LENGTH_LONG).show();
}
break;
}
}
@Override
public void onBackPressed() {
}
公共类NewsSuggestion扩展了AppCompative活动{
private EditText etYear, etMonth, etTitle, etOwnValue;
private RadioGroup rgSuggestWill;
private RadioButton radioButton;
private Button btnNext;
ArrayAdapter<CharSequence> adapter;
private Spinner spReviewer;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_new_suggestion);
final ActionBar abar = getSupportActionBar();
View viewActionBar = getLayoutInflater().inflate(R.layout.activity_new_suggestion, null);
ActionBar.LayoutParams params = new ActionBar.LayoutParams(//Center the textview in the ActionBar !
ActionBar.LayoutParams.WRAP_CONTENT,
ActionBar.LayoutParams.MATCH_PARENT,
Gravity.CENTER);
TextView tvTitle = viewActionBar.findViewById(R.id.title);
tvTitle.setText("NEW SUGGESTION");
abar.setCustomView(viewActionBar, params);
abar.setDisplayShowCustomEnabled(true);
abar.setDisplayShowTitleEnabled(false);
//abar.setDisplayHomeAsUpEnabled(true);
abar.setHomeButtonEnabled(true);
etTitle = findViewById(R.id.etTitle);
etYear = findViewById(R.id.etYear);
etMonth = findViewById(R.id.etMonth);
rgSuggestWill =findViewById(R.id.rgSuggestWill);
final Calendar c = Calendar.getInstance();
String mm = c.getDisplayName(Calendar.MONTH, Calendar.LONG, Locale.US);
int yy = c.get(Calendar.YEAR);
etYear.setText(new StringBuilder().append(yy));
etMonth.setText(new StringBuilder().append(mm));
spReviewer = findViewById(R.id.spReviewer);
adapter = ArrayAdapter.createFromResource(this,R.array.reviewer,android.R.layout.simple_spinner_item);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spReviewer.setAdapter(adapter);
spReviewer.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
}
});
btnNext = findViewById(R.id.btnNext);
btnNext.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
SharedPreferences sharedPref = getSharedPreferences("MyData",MODE_PRIVATE);
SharedPreferences.Editor editor = sharedPref.edit();
editor.putString("title",etTitle.getText().toString());
editor.putString("year",etYear.getText().toString());
editor.putString("month",etMonth.getText().toString());
// get selected radio button from radioGroup
int selectedId = rgSuggestWill.getCheckedRadioButtonId();
// find the radiobutton by returned id
radioButton = findViewById(selectedId);
editor.putString("suggestionwill",radioButton.getText().toString());
if (spReviewer.getSelectedItem().toString().equals("Please choose")){
AlertDialog alertDialog = new AlertDialog.Builder(NewSuggestion.this).create();
alertDialog.setTitle("Alert");
alertDialog.setMessage("Please choose your reviewer");
alertDialog.setButton(AlertDialog.BUTTON_NEUTRAL, "OK",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
}
});
alertDialog.show();
}else{
editor.putString("reviewer",spReviewer.getSelectedItem().toString());
Intent intent = new Intent(NewSuggestion.this,NewSuggestion2.class);
startActivity(intent);
}
editor.apply();
}
});
}
@Override
public void onBackPressed() {
Intent intent = new Intent(NewSuggestion.this, DashboardApp.class);
startActivity(intent);
}
}为SharedRef中的礼物、细节和利益分配价值
SharedPreferences sharedPref = getSharedPreferences("MyData", MODE_PRIVATE);
SharedPreferences.Editor editor = sharedPref.edit();
etPresent = findViewById(R.id.etPresent);
etDetails = findViewById(R.id.etDetails);
etBenefit = findViewById(R.id.etBenefit);
etPresent.setText(sharedPref.getString("present", ""));
etDetails.setText(sharedPref.getString("details", ""));
etBenefit.setText(sharedPref.getString("benefit", ""));
在活动B中,确保将数据保存在onBackPressed()
您必须重写onBackPress()方法。在活动B中,有必要将数据放入SharedReferences
@Override
public void onBackPressed() {
SharedPreferences sharedPref = getSharedPreferences("MyData", MODE_PRIVATE);
SharedPreferences.Editor editor = sharedPref.edit();
editor.putString("present", etPresent.getText().toString());
editor.putString("details", etDetails.getText().toString());
editor.putString("benefit", etBenefit.getText().toString());
editor.commit();
}
检查您的共享首选项是否在设备文件资源管理器中保存数据。您在下一次单击时将数据保存到共享性能,但从未在ActivityB中单击“下一步”。尝试将数据保存到TextChangedListener上的共享首选项,或在“下一步”中保存数据,并在“下一步”和“下一步”中同时按下两个按钮。在活动B中,也可以在“上一步”方法中调用共享首选项的数据存储。您可以按照此答案在sahredPreference中保存和检索数据:-执行此操作时请遵循此链接。问题仍然存在。我是否应该删除下一步中的SharedReference按钮?没有必要,当您打开活动B时,请确保您正在设置值(当前、当前、当前)。来自sahredpref。据我所知,您可以按共享偏好存储数据,但不能正确使用。你们能分享活动A和B的全部代码吗?让我明确一下这两个活动的生命周期。1.创建活动A。2.输入一些值3.按“下一步”将创建活动B。4.在活动B中按back键时,将显示活动A的相同实例。但当你再次按下“下一步”时,如果你用代码更新你的问题本身,就会创建活动B的新实例(这样就不会输入数据),更新答案也会更好。问题仍然存在。我是否应该删除“下一步”按钮中的SharedReference?
@Override
public void onBackPressed() {
SharedPreferences sharedPref = getSharedPreferences("MyData", MODE_PRIVATE);
SharedPreferences.Editor editor = sharedPref.edit();
editor.putString("present", etPresent.getText().toString());
editor.putString("details", etDetails.getText().toString());
editor.putString("benefit", etBenefit.getText().toString());
editor.commit();
}