セーブデータ

Question

アプリケーションは、ツールバー上に存在ボタンですべてのタブからのデータを保存しようとしている....

ボタンストアのデータ、ユーザプロファイル

を作成するために、私は私のデータベースをテストしています...取得次のNullPointerException細かい..stillを.working

import android.content.Context; 
import android.os.Bundle; 
import android.support.design.widget.TabLayout; 
import android.support.v4.app.Fragment; 
import android.support.v4.app.FragmentManager; 
import android.support.v4.app.FragmentPagerAdapter; 
import android.support.v4.view.ViewPager; 
import android.support.v7.app.AppCompatActivity; 
import android.support.v7.widget.Toolbar; 
import android.util.Log; 
import android.view.View; 
import android.widget.Button; 
import android.widget.EditText; 
import android.widget.Toast; 

import java.util.ArrayList; 
import java.util.List; 

public class PROFILE extends AppCompatActivity { 
    EditText etname,etdate,etmarital_status,etcity,etemail,etaddress,etqualification, 
    etobjective,etproject,etachievement,etwork; 
    Button svbtn; 
    String name; 
    String date; 
    String marital_status; 
    String city; 
    String email; 
    String address; 
    String qualification; 
    String objective; 
    String project; 
    String achievement; 
    String work; 
    Context ctx = this; 
    Context CTX = this; 
    private Toolbar toolbar; 
    private TabLayout tabLayout; 
    private ViewPager viewPager; 
    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_profile); 
     toolbar = (Toolbar) findViewById(R.id.toolbar); 
     setSupportActionBar(toolbar); 
     getSupportActionBar().setDisplayHomeAsUpEnabled(true); 

     etname = (EditText) findViewById(R.id.name); 
     etdate = (EditText) findViewById(R.id.dob); 
     etmarital_status = (EditText) findViewById(R.id.ms); 
     etcity = (EditText) findViewById(R.id.city); 
     etemail = (EditText) findViewById(R.id.email); 
     etaddress = (EditText) findViewById(R.id.address); 
     etqualification = (EditText) findViewById(R.id.qualification); 
     etobjective = (EditText) findViewById(R.id.objective); 
     etproject = (EditText) findViewById(R.id.project); 
     etachievement = (EditText) findViewById(R.id.achevement); 
     etwork = (EditText) findViewById(R.id.work); 
     svbtn = (Button) findViewById(R.id.save); 

     //button to save data of all tabs 
     svbtn.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View view) { 
       // converting EditText data to string 
       name = etname.getText().toString(); 
       city = etcity.getText().toString(); 
       email = etemail.getText().toString(); 
       address = etaddress.getText().toString(); 
       qualification = etqualification.getText().toString(); 
       objective = etobjective.getText().toString(); 
       project = etproject.getText().toString(); 
       achievement = etachievement.getText().toString(); 
       work = etwork.getText().toString(); 
       marital_status = etmarital_status.toString(); 

       //calling database DatabaseHandler 
       DatabaseHandler handler = new DatabaseHandler(getApplicationContext()); 
       handler.putInformation(handler,name,date,marital_status,city,email,address,objective,project,achievement,work); 

       Toast.makeText(getApplicationContext(),name,Toast.LENGTH_LONG); 
      } 
     }); 

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

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

    private void setupViewPager(ViewPager viewPager){ 

     ViewPagerAdapter adapter = new ViewPagerAdapter(getSupportFragmentManager()); 
      adapter.addFragment(new INFORMATION(), "GENERAL"); 
     adapter.addFragment(new QUALIFICATION(), "QUALIFICATION"); 

     adapter.addFragment(new OBJECTIVE(), "OBJECTIVE"); 

     adapter.addFragment(new PROJECTS(), "PROJECTS"); 

     adapter.addFragment(new ACHIEVEMENTS(), "ACHIEVEMENTS"); 

     adapter.addFragment(new WORK(), "WORK"); 

     viewPager.setAdapter(adapter); 
    } 

    class ViewPagerAdapter extends FragmentPagerAdapter { 
     private final List<Fragment> mFragmentList = new ArrayList<>(); 
     private final List<String> mFragmentTitleList = new ArrayList<>(); 

     public ViewPagerAdapter(FragmentManager manager) { 
      super(manager); 
     } 

     @Override 
     public Fragment getItem(int position) { 
      return mFragmentList.get(position); 
     } 

     @Override 
     public int getCount() { 
      return mFragmentList.size(); 
     } 

     @Override 
     public CharSequence getPageTitle(int position) { 
      return mFragmentTitleList.get(position); 
     } 
     public void addFragment(Fragment fragment, String title) { 
      mFragmentList.add(fragment); 
      mFragmentTitleList.add(title); 
     } 
    } 
} 

エラーログ：

E/AndroidRuntime: FATAL EXCEPTION: main 
      Process: com.example.vikas.renaz, PID: 17785 
      java.lang.NullPointerException: Attempt to invoke virtual method 'android.text.Editable android.widget.EditText.getText()' on a null object reference 
       at com.example.vikas.renaz.PROFILE$1.onClick(PROFILE.java:68) 
       at android.view.View.performClick(View.java:4785) 
       at android.view.View$PerformClick.run(View.java:19884) 
       at android.os.Handler.handleCallback(Handler.java:739) 
       at android.os.Handler.dispatchMessage(Handler.java:95) 
       at android.os.Looper.loop(Looper.java:135) 
       at android.app.ActivityThread.main(ActivityThread.java:5343) 
       at java.lang.reflect.Method.invoke(Native Method) 
       at java.lang.reflect.Method.invoke(Method.java:372) 
       at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:905) 
       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:700) 

Answer 1

"activity_profile.xml"が表示されません。しかし、私はあなたのEditText（s）をそれぞれのフラグメントごとに別々のレイアウトファイルで各フラグメントに配置すると思います。その場合は、タブを選択しない限り "onCreateView"メソッドが呼び出されないので、アクティビティではなく各フラグメントでEditTextが見つかるはずです。そのビューを見つけると "null"値が得られますアクティビティ。