我的共享权限不正确

Question

我有一个应用程序，您可以在其中将图像上传到我公司服务器 因此，用户输入他们的登录详细信息，电子邮件，密码和clientID(4位代码((在LoginActivity.java中(，然后必须将此信息传递给所有其他活动，然后使用此传递的信息来构建URL。现在我遇到的问题是共享优先级无法正确共享......它们要么在 URL 上显示为 NULL，要么只是"电子邮件"或"密码" 信息已正确保存在登录活动中，但是当我尝试将其传递给其他活动时，它失败了

登录活动在这里我保存了偏好

public class LoginActivity extends AppCompatActivity implements TextWatcher {

SharedPreferences MyPrefs;
Intent intent;
SharedPreferences.Editor editor;
public static final String PREF_NAME= "MYPREFS";
public static final  String ID = "ClientID" ;
public static final  String EMAIL = "username" ;
public static final  String PASS = "password";
EditText email, password, id;
@SuppressLint("CommitPrefEdits")
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login);
Button buttonOne=findViewById(R.id.button);
buttonOne.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {

Intent activity2Intent=new Intent(getApplicationContext(), MainActivity.class);
startActivity(activity2Intent);
}
});
MyPrefs= getSharedPreferences(PREF_NAME, 0);
editor = MyPrefs.edit();

email=findViewById(R.id.emailtext);
password=findViewById(R.id.pwdtext);
id=findViewById(R.id.clientid);
email.setText(MyPrefs.getString(EMAIL,"username"));
password.setText(MyPrefs.getString(PASS,"password"));
id.setText(MyPrefs.getString(ID, "id"));
email.addTextChangedListener(this);
password.addTextChangedListener(this);
id.addTextChangedListener(this);
MyPrefs =getSharedPreferences(EMAIL,0);
MyPrefs =getSharedPreferences(ID,0);
MyPrefs =getSharedPreferences(PASS,0);
intent = new Intent(LoginActivity.this,CameraActivity.class);

}
@Override
public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {
}
@Override
public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {
managePrefs();
}
@Override
public void afterTextChanged(Editable editable) {
managePrefs();
}

private void managePrefs(){
SharedPreferences.Editor editor =MyPrefs.edit();
editor.putString(EMAIL, email.getText().toString().trim());
editor.putString(PASS, password.getText().toString().trim());
editor.putString(ID, id.getText().toString().trim());
editor.apply();
}
@Override
public void onPointerCaptureChanged(boolean hasCapture) {
}
}

相机活动 这是必须将共享优先级传递给的位置

public class CameraActivity extends AppCompatActivity implements View.OnClickListener {
private final int PICK_IMAGE=12345;
private final int REQUEST_CAMERA=6352;
private static final int REQUEST_CAMERA_ACCESS_PERMISSION=5674;
private Bitmap bitmap;
String myURL;
String email;
String clientId;
String pwd;


private ImageView imageView;

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

我用于调用共享首选项的代码

SharedPreferences sharedPreferences = getSharedPreferences(LoginActivity.PREF_NAME, 0);
email = sharedPreferences.getString(LoginActivity.EMAIL, "username");
clientId = sharedPreferences.getString(LoginActivity.ID, "id");
pwd = sharedPreferences.getString(LoginActivity.PASS, "password");

imageView=findViewById(R.id.imageView);
Button fromCamera=findViewById(R.id.fromCamera);
Button fromGallery=findViewById(R.id.fromGallery);
Button upload=findViewById(R.id.upload);
upload.setOnClickListener(this);
fromCamera.setOnClickListener(this);
fromGallery.setOnClickListener(this);
}
@Override
public void onClick(View view) {

switch (view.getId()) {
case R.id.fromCamera:
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M
&& ActivityCompat.checkSelfPermission(this, Manifest.permission.CAMERA)
!= PackageManager.PERMISSION_GRANTED) {
requestPermissions(new String[]{Manifest.permission.CAMERA},
REQUEST_CAMERA_ACCESS_PERMISSION);
} else {
getImageFromCamera();
}
break;
case R.id.fromGallery:
getImageFromGallery();
break;
case R.id.upload:
if (bitmap != null)
uploadImageToServer();
break;
}

}

private void uploadImageToServer() {
@SuppressLint("SimpleDateFormat") SimpleDateFormat dateFormat = new SimpleDateFormat("yyyyMMdd_HH_mm_ss");
String currentTimeStamp = dateFormat.format(new Date());
final ProgressDialog pd=new ProgressDialog(CameraActivity.this);
pd.setMessage("Uploading, Please Wait....");
pd.show();
Intent intent = getIntent();
String Item= intent.getStringExtra("Spinner");
String Item2= intent.getStringExtra("Spinner2");

Uri.Builder builder=new Uri.Builder();
builder.scheme("https")
.authority("www.smartpractice.co.za")
.appendPath("files-upload-ruben.asp")
.appendQueryParameter("MyForm", "Yes")
.appendQueryParameter("ClientID",clientId)
.appendQueryParameter("Username", email)
.appendQueryParameter("Pwd", pwd)
.appendQueryParameter("category",Item )
.appendQueryParameter("client",Item2 );
myURL=builder.build().toString();
Toast toast = Toast.makeText(CameraActivity.this, myURL , Toast.LENGTH_LONG);
toast.show();
File imageFile=persistImage(bitmap,currentTimeStamp);
Ion.with(this)
.load(myURL)
.uploadProgressDialog(pd)
.setMultipartFile("SP-LOG", "image/jpeg", imageFile)

.asString()

.setCallback(new FutureCallback<String>() {
@Override
public void onCompleted(Exception e, String result) {
pd.cancel();
Toast.makeText(getApplicationContext(),"Uploaded",Toast.LENGTH_SHORT).show();
}
});
}
private File persistImage(Bitmap bitmap, String name) {
File filesDir=getApplicationContext().getFilesDir();
File imageFile=new File(filesDir, name + ".jpg");
OutputStream os;
try {
os=new FileOutputStream(imageFile);
bitmap.compress(Bitmap.CompressFormat.JPEG, 100, os);
os.flush();
os.close();
} catch (Exception e) {
Log.e(getClass().getSimpleName(), "Error writing bitmap", e);
}
return imageFile;
}

private void getImageFromCamera() {
Intent intent=new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
startActivityForResult(intent, REQUEST_CAMERA);
}
private void getImageFromGallery() {
Intent intent=new Intent();
intent.setType("image/*");
intent.setAction(Intent.ACTION_GET_CONTENT);
if (intent.resolveActivity(getPackageManager()) != null) {
startActivityForResult(Intent.createChooser(intent, "Select Picture"), PICK_IMAGE);
}
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == PICK_IMAGE) {
if (resultCode == Activity.RESULT_OK) {
try {
InputStream inputStream=getContentResolver().openInputStream(data.getData());
bitmap=BitmapFactory.decodeStream(inputStream);
imageView.setImageBitmap(bitmap);
} catch (FileNotFoundException e) {
e.printStackTrace();
}
}
} else if (requestCode == REQUEST_CAMERA) {
if (resultCode == Activity.RESULT_OK) {
Bundle extras=data.getExtras();
bitmap=(Bitmap) extras.get("data");
imageView.setImageBitmap(bitmap);
}
}
}

@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
if (requestCode == REQUEST_CAMERA_ACCESS_PERMISSION) {
if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
getImageFromCamera();
}
} else {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
}
}
}

Answer 1

要在共享首选项中存储数据，请执行以下操作：

private SharedPreferences.Editor editor = getSharedPreferences(PREF_NAME, MODE_PRIVATE).edit();
editor.putString("email", email);
editor.putString("ID", id);
editor.putString("Pass", password);
editor.apply();

所以当你写editor.putString("email"，email(时，我会给你一些解释;它告诉编辑把你的电子邮件放在关键"email"上。

现在，如果您想读回这些值，请执行以下操作：

String email = getSharedPreferences(PREF_NAME, MODE_PRIVATE).getString("email", "");
String ID= getSharedPreferences(PREF_NAME, MODE_PRIVATE).getString("ID", "");
String password= getSharedPreferences(PREF_NAME, MODE_PRIVATE).getString("Pass", "");

莱姆知道你是否什么都不懂。

Answer 2

getSharedPrerencences(String name, int mode)返回对共享首选项文件的引用name。也就是说，在行之后

MyPrefs =getSharedPreferences(EMAIL,0);
MyPrefs =getSharedPreferences(ID,0);
MyPrefs =getSharedPreferences(PASS,0);

您的变量 MyPrefs 指向名为password的共享首选项文件，这可能不是您想要的，因为稍后您从名为MYPREFS的文件中读取。

此外，如果您只是从首选项中读取，则无需调用editor = MyPrefs.edit();，就像您在onCreate中所做的那样。这就是为什么您会收到已使用@SuppressLint("CommitPrefEdits")抑制的警告的原因