我正在尝试将数据从"活动"传递到Fragment。
这是我的呼叫活动。使用此活动，我想将数据传递给ProfileFragment为此，我使用Bundle。但是我在ProfileFragment上得到了错误，如上面所示
NewAccount.java
package com.example.takeattendence;
import androidx.appcompat.app.AppCompatActivity;
import android.app.Fragment;
import android.app.FragmentManager;
import android.content.ContentValues;
import android.content.Intent;
import android.content.SharedPreferences;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.Bundle;
import android.text.TextUtils;
import android.util.Base64;
import android.util.Patterns;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Spinner;
import android.widget.TextView;
import android.widget.Toast;
import java.io.ByteArrayOutputStream;
import java.util.ArrayList;
import java.util.List;
import com.example.takeattendence.database.LoginContract.LoginEntry;
import com.example.takeattendence.database.LoginContractStudent;
import com.example.takeattendence.database.LoginDbHelper;
import com.example.takeattendence.database.LoginContractStudent.LoginEntryStudent;
public class NewAccount extends AppCompatActivity
{
//EditText field to First name of user
private EditText mFirstNameEditText;
//EditText field to Last Name of user
private EditText mLastNameEditText;
//EditText field to Phone Number of user
private EditText mPhoneNumberEditText;
//EditText field to Email Id of user
private EditText mEmailIdEditText;
//EditText field to Password of User
private EditText mPasswordEditText;
//Spinner field for post
private Spinner mPostSpinner;
private String mPost = "Leturer";
//Spinner field to gender of user
private Spinner mGenderSpinner;
private String mGender = "Other";
//Button for Register
private Button mRegisterButton;
//Textview for Log in
private TextView mLogInTextView;
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_new_account);
mFirstNameEditText =(EditText)findViewById(R.id.editText_first_name);
mLastNameEditText = (EditText)findViewById(R.id.editText_last_name);
mPhoneNumberEditText =(EditText)findViewById(R.id.editText_phone_number);
mEmailIdEditText = (EditText) findViewById(R.id.editText_email_id_sign_up);
mPasswordEditText =(EditText) findViewById(R.id.editText_pass_sign_up);
mPostSpinner = (Spinner)findViewById(R.id.spinner_post);
mGenderSpinner=(Spinner) findViewById(R.id.spinner_gender);
mRegisterButton = (Button) findViewById(R.id.button_register);
mLogInTextView = (TextView) findViewById(R.id.textview_log_in);
setUpSpinnerPost();
setUpSpinnerGender();
mLogInTextView.setOnClickListener(new View.OnClickListener()
{
@Override
public void onClick(View v)
{
Intent i = new Intent(NewAccount.this,MainActivity.class);
startActivity(i);
}
});
final LoginDbHelper mLoginDbHelper = new LoginDbHelper(this);
mRegisterButton.setOnClickListener(new View.OnClickListener()
{
@Override
public void onClick(View v)
{
//insert data
insertUserData();
}
});
}
public void insertUserData()
{
Bundle bundle = new Bundle();
bundle.putString("data", "Data");
// Your fragment
ProfileFragment obj = new ProfileFragment();
obj.setArguments(bundle);
Intent i = new Intent(NewAccount.this,WelcomeApp.class);
startActivity(i);
}
}
欢迎App.java
package com.example.takeattendence;
import androidx.annotation.NonNull;
import androidx.appcompat.app.ActionBarDrawerToggle;
import androidx.appcompat.app.AppCompatActivity;
import androidx.appcompat.widget.Toolbar;
import androidx.core.view.GravityCompat;
import androidx.drawerlayout.widget.DrawerLayout;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.view.MenuItem;
import com.google.android.material.navigation.NavigationView;
public class WelcomeApp extends AppCompatActivity implements NavigationView.OnNavigationItemSelectedListener
{
private DrawerLayout drawerLayout;
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_welcome_app);
Toolbar toolbar = findViewById(R.id.nav_toolbar);
setSupportActionBar(toolbar);
drawerLayout = findViewById(R.id.drawer_layout);
NavigationView navigationView = findViewById(R.id.nav_view);
navigationView.setNavigationItemSelectedListener(this);
ActionBarDrawerToggle actionBarDrawerToggle = new ActionBarDrawerToggle(this,drawerLayout,toolbar,
R.string.navigation_drawer_open,R.string.navigation_drawer_close);
drawerLayout.addDrawerListener(actionBarDrawerToggle);
actionBarDrawerToggle.syncState();
if(savedInstanceState == null)
{
getSupportFragmentManager().beginTransaction().replace(R.id.fragment_container,
new ProfileFragment()).commit();
// Intent i = new Intent(WelcomeApp.this, TestAcitivity.class);
// startActivity(i);
navigationView.setCheckedItem(R.id.nav_profile);
}
// finish();
}
@Override
public boolean onNavigationItemSelected(@NonNull MenuItem menuItem)
{
switch (menuItem.getItemId())
{
case R.id.nav_profile:
getSupportFragmentManager().beginTransaction().replace(R.id.fragment_container,
new ProfileFragment()).commit();
break;
case R.id.nav_update_profile:
getSupportFragmentManager().beginTransaction().replace(R.id.fragment_container,
new UpdateProfileFragment()).commit();
break;
case R.id.nav_see_database:
getSupportFragmentManager().beginTransaction().replace(R.id.fragment_container,
new StudenetInfoFragment()).commit();
break;
case R.id.nav_logout:
// Intent in = new Intent(WelcomeApp.this,MainActivity.class);
// startActivity(in);
// finish();
// SharedPreferences.Editor editor = getSharedPreferences("POS", MODE_PRIVATE).edit();
// editor.putString("password", "");
// editor.putString("email", "");
// editor.putBoolean("isLoggedIn", false);
// editor.apply();
//
// Intent intent = new Intent(getApplicationContext(), MainActivity.class);
// intent.putExtra("finish", true);
// intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
// startActivity(intent);
// finish();
SharedPreferences.Editor editor = getSharedPreferences("name", MODE_PRIVATE).edit();
editor.putString("password", "");
editor.putString("email", "");
editor.putBoolean("isLoggedIn", false);
editor.apply();
Intent intent = new Intent(getApplicationContext(), MainActivity.class);
intent.putExtra("finish", true);
intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(intent);
finish();
break;
default:
}
drawerLayout.closeDrawer(GravityCompat.START);
return true;
}
@Override
public void onBackPressed()
{
moveTaskToBack(true);
}
}
ProfileFragment.java
package com.example.takeattendence;
import android.content.Intent;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.TextView;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.fragment.app.Fragment;
import static android.app.Activity.RESULT_OK;
public class ProfileFragment extends Fragment //implements LoaderManager.LoaderCallbacks<Cursor>
{
public ProfileFragment()
{
}
@Nullable
@Override
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState)
{
View view = inflater.inflate(R.layout.fragment_profile,container,false);
TextView firstNameTextView = (TextView)view.findViewById(R.id.textview_profile_first_name);
String strtext = this.getArguments().getString("data");
firstNameTextView.setText(strtext);
return view;
}
我在谷歌上搜索过，但没有找到合适的解决方案。提前谢谢。
在片段实例化中使用这个：
ProfileFragment frag = new ProfileFragment();
Bundle b = new Bundle();
b.putString("data", "your data goes here");
frag.setArguments(b);
getSupportFragmentManager((.beginTransaction((.replace(R.id.fragment_container，frag(.commit((；