保存所有标签的数据

Question

应用程序即将使用工具栏上的按钮保存所有选项卡中的数据....

按钮存储数据以创建用户个人资料

我已经测试了我的数据库....正常工作..还会跟随NullPointerException

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);
        }
    }
}

错误日志：

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

我没有看到你的＆＃34; activity_profile.xml＆＃34;。但是我猜你会把每个片段的EditText放在每个片段的单独布局文件中。在这种情况下，您应该在每个片段中找到EditText，而不是在Activity中，因为＆＃34; onCreateView＆＃34;除非您选择选项卡，否则不会调用方法，因此您将获得＆＃34; null＆＃34;当您在活动中找到该视图时的值。