如何获取用户输入并将其传递给Android Sutdio中的另一个片段？

Question

在我的应用我的活动之一，

protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_user_input); 

    idInput = (EditText) findViewById(R.id.user_id_input); 

    submitButton = (Button) findViewById((R.id.submit_button)); 
    submitButton.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 
      githubID = idInput.getText().toString(); 
     } 
    }); 

} 

我创建了一个部分，其中用户可以输入一个名为“githubID”字符串。我试图将这个提交给另一个名为profile_tab的片段，其中github API URL被解析并用于显示用户的信息。该profile_tab样子：

public class ProfileTab extends Fragment{ 

    // URL of the Github API to be parsed 
    final String APIURL = "https://api.github.com/users/" + userID; 

    // All TextView data to be displayed on the profile_tab layout 
    ... 

    // Data for the profile(avatar) image 
    ... 

    // ViewPager for navigating to another tab 
    private ViewPager viewPager; 

    @Nullable 
    @Override 
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) { 
    ... 

我怎样才能从第一页的输入字符串，然后传递值到ProfileTab页面并更换“用户ID”的字符串？

编辑：

UserInput.java

public class UserInput extends AppCompatActivity { 

    String githubID; 

    EditText idInput; 

    Button submitButton; 

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

     idInput = (EditText) findViewById(R.id.user_id_input); 

     submitButton = (Button) findViewById((R.id.submit_button)); 

     SharedDataUtils.createSP(this, idInput.getText().toString()); 

     submitButton.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View v) { 

       githubID = idInput.getText().toString(); 
       Intent intent = new Intent(UserInput.this, MainActivity.class); 
       intent.putExtra("flag", 1); 
       startActivity(intent); 

      } 
     }); 
    } 

} 

MainActivity.java

public class MainActivity extends AppCompatActivity { 

    private FragmentManager fragmentManager; 
    private FragmentTransaction fragmentTransaction; 

    private SectionsPageAdapter pageAdapter; 
    private ViewPager viewPager; 


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

     fragmentManager = getSupportFragmentManager(); 
     fragmentTransaction = fragmentManager.beginTransaction(); 

     Intent intent = getIntent(); 

     int flag = intent.getIntExtra("flag", -1); 
     if(flag > 0) { 
      if(flag == 1) { 
       fragmentTransaction.replace(R.id.layout, ProfileTab); 
      } 
     } 


     pageAdapter = new SectionsPageAdapter(getSupportFragmentManager()); 

     // Sets up the ViewPager with the sections adapter 

     viewPager = (ViewPager) findViewById(R.id.container); 
     setupViewPager(viewPager); 

     TabLayout tabLayout = (TabLayout) findViewById(R.id.tabs); 
     tabLayout.setupWithViewPager((viewPager)); 
    } 

    // Adds fragments to SectionsPageAdapter and gives names for the corresponding tab 

    private void setupViewPager(ViewPager viewPager) { 
     SectionsPageAdapter adapter = new SectionsPageAdapter(getSupportFragmentManager()); 
     adapter.addFragment(new ProfileTab(), "Profile"); 
     adapter.addFragment(new GithubTab(), "Github Repos"); 
     adapter.addFragment(new FollowerTab(), "Followers"); 
     adapter.addFragment(new FollowingTab(), "Followings"); 
     viewPager.setAdapter(adapter); 
    } 

} 

ProfileTab.java（片段解析JSON）

public class ProfileTab extends Fragment{ 

    // URL of the Github API to be parsed 
    private String APIURL; 
    private String userID; 

    // All TextView data to be displayed on the profile_tab layout 
    private TextView githubID; 
    private TextView numRepos; 
    private TextView numFollowers; 
    private TextView numFollowings; 
    private TextView userBio; 
    private TextView userWebsite; 
    private TextView userName; 
    private TextView createdDate; 

    // Data for the profile(avatar) image 
    private ImageView avatarImage; 
    private String avatarURL; 
    Bitmap imageBitmap; 

    // ViewPager for navigating to another tab 
    private ViewPager viewPager; 

    @Nullable 
    @Override 
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) { 
     ... code hidden ... 
    } 

这是我看你的帮助后，没有和我对

int flag = intent.getIntExtra("flag", -1); 
    if(flag > 0) { 
     if(flag == 1) { 
      fragmentTransaction.replace(R.id.layout, ProfileTab); 
     } 
    } 

得到一个错误的MainActivity.java任何想法，我做错了什么？

Answer 1

1，创建SharedPreferenceUtils保存和获取数据

public class SharedPreferenceUtils { 

    private static final String SP_NAME = "sp"; 
    public static final String USER_ID = "userId"; 


    // create 
    public static boolean createSP(Context context, String userId) { 
     SharedPreferences.Editor editor = context.getSharedPreferences(SP_NAME, Context.MODE_PRIVATE).edit(); 
     editor.putString(USER_ID, userId); 
     return editor.commit(); 
    } 


    // get userID 
    public static String getUserId(Context context) { 
     SharedPreferences sp = context.getSharedPreferences(SP_NAME, Context.MODE_PRIVATE); 
     return sp.getString(USER_ID, ""); 
    } 
} 

在Activity

protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_user_input); 

    idInput = (EditText) findViewById(R.id.user_id_input); 

    submitButton = (Button) findViewById((R.id.submit_button)); 
    // edited here ,create and save useId 
    SharedPreferenceUtils.createSP(this, idInput.getText().toString()); 
    submitButton.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 
      githubID = idInput.getText().toString(); 
      // edited here 
      Intent intent = new Intent(UserInputActivity.this, YourNextActivity.class); 
      intent.putExtra("flag", 1); 
      startActivity(intent); 
     } 
    }); 
} 

3.get数据2.Sava数据Fragment

private String APIURL; 
private String userID; 

@Nullable 
@Override 
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) { 
    ... 
    // edited here , get userId 
    userID = SharedPreferenceUtils.getUserId(getActivity()); 
    APIURL = "https://api.github.com/users/" + userID; 
} 

4. NextActivity

private FragmentManager fmanager; 
private FragmentTransaction ftransaction; 

protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_your_next); 
    fmanager = getSupportFragmentManager(); 
    ftransaction = fmanager.beginTransaction(); 

    Intent intert = getIntent(); 
    int flag = intert.getIntExtra("flag", -1); 
    if (flag > 0) { 
     System.out.println("flag" + flag); 
     if (flag == 1) { 
      // go to fragment 
      ftransaction.replace(R.id.layout, yourFrgament); 
     } 
    } 
} 

编辑

// position is the fragment you want to go 
TabLayout tabLayout = (TabLayout) findViewById(R.id.tabs); 
tabLayout.setupWithViewPager((viewPager)); 
int flag = intent.getIntExtra("flag", -1); 
if(flag > 0) { 
    if(flag == 1) { 
     viewPager.setCurrentItem(your_tab_position); 
    } 
}