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アクティビティから値を渡すとエラーが発生しますjava.lang.NullPointerException

2017-09-20 9 views
0

こんにちは、 アクティビティクラスの変数の値をフラグメントに渡すプログラムがありますが、この1つのようにあまりにも多くのリサーチをしましたが、Send data from activity to fragment in androidそれは常に私の断片である、ここでは、ここで アクティビティから値を渡すとエラーが発生しますjava.lang.NullPointerException

が 
private SectionsPagerAdapter mSectionsPagerAdapter; 

String companyName, companyDescripiton, lat, lng, contact1, contact2, contact3, contact4, email, tag1, tag2, tag3, tag4,tag5,website; 

/** 
* The {@link ViewPager} that will host the section contents. 
*/ 
private ViewPager mViewPager; 

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


    Bitmap bitmap = (Bitmap) getIntent().getParcelableExtra("BitmapImage"); 

    companyName = getIntent().getExtras().getString("CompanyName"); 
    companyDescripiton = getIntent().getExtras().getString("Description"); 
    lat = getIntent().getExtras().getString("latitude"); 
    lng = getIntent().getExtras().getString("longtitude"); 
    contact1 = getIntent().getExtras().getString("contact1"); 
    contact2 = getIntent().getExtras().getString("contact2"); 
    contact3 = getIntent().getExtras().getString("contact3"); 
    contact4 = getIntent().getExtras().getString("contact4"); 
    email = getIntent().getExtras().getString("email"); 
    tag1 = getIntent().getExtras().getString("tag1"); 
    tag2 = getIntent().getExtras().getString("tag2"); 
    tag3 = getIntent().getExtras().getString("tag3"); 
    tag4 = getIntent().getExtras().getString("tag4"); 
    tag5 = getIntent().getExtras().getString("tag5"); 
    website = getIntent().getExtras().getString("website"); 

    Bundle bundleTitle = new Bundle(); 
    bundleTitle.putString("CompanyName", companyName); 
    bundleTitle.putString("Description", companyDescripiton); 
    bundleTitle.putString("contact1",contact1); 
    bundleTitle.putString("contact2",contact2); 
    bundleTitle.putString("contact3",contact3); 
    bundleTitle.putString("contact4",contact4); 
    bundleTitle.putString("tag1",tag1); 
    bundleTitle.putString("tag2",tag2); 
    bundleTitle.putString("tag3",tag3); 
    bundleTitle.putString("tag4",tag4); 
    bundleTitle.putString("tag5",tag5); 
    bundleTitle.putString("website",website); 
    bundleTitle.putString("email",email); 

    ByteArrayOutputStream stream = new ByteArrayOutputStream(); 
    bitmap.compress(Bitmap.CompressFormat.JPEG, 100, stream); 
    byte[] byteArray = stream.toByteArray(); 

    bundleTitle.putByteArray("logo", byteArray); 

    TabTitle tabTitle = new TabTitle(); 
    tabTitle.setArguments(bundleTitle); 

    Bundle bundleLocation = new Bundle(); 
    bundleLocation.putString("lat", lat); 
    bundleLocation.putString("lng", lng); 
    bundleLocation.putString("companyName", companyName); 

    TabLocation tabLocation = new TabLocation(); 
    tabLocation.setArguments(bundleLocation); 


    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); 
    setSupportActionBar(toolbar); 

    // Create the adapter that will return a fragment for each of the three 
    // primary sections of the activity. 
    mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager()); 

    // Set up the ViewPager with the sections adapter. 
    mViewPager = (ViewPager) findViewById(R.id.container); 
    mViewPager.setAdapter(mSectionsPagerAdapter); 

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

    FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab); 
    fab.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View view) { 
      Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG) 
        .setAction("Action", null).show(); 
     } 
    }); 

    getSupportActionBar().setDisplayShowHomeEnabled(true); 
    getSupportActionBar().setDisplayHomeAsUpEnabled(true); 
}

CompanyPageActivity.java

私の活動ですが、私はなぜ知らない、私にエラーを与え、 

ImageView logo; 
TextView companyNametxt, companyDescripitontxt, contacts, emailtxt, tags, websitetxt; 

String companyName, companyDescripiton, contact1, contact2, contact3, contact4, email, tag1, tag2, tag3, tag4,tag5,website; 

@Override 
public View onCreateView(LayoutInflater inflater, ViewGroup container, 
         Bundle savedInstanceState) { 
    View rootView = inflater.inflate(R.layout.company_title, container, false); 

    companyNametxt = (TextView)rootView.findViewById(R.id.companyName); 
    companyDescripitontxt = (TextView)rootView.findViewById(R.id.companyDescription); 
    contacts = (TextView)rootView.findViewById(R.id.contact); 
    emailtxt = (TextView)rootView.findViewById(R.id.email); 
    tags = (TextView)rootView.findViewById(R.id.tag); 
    websitetxt = (TextView)rootView.findViewById(R.id.website); 
    logo = (ImageView) rootView.findViewById(R.id.logo); 

    companyName = getArguments().getString("CompanyName"); //line number 42 
    companyDescripiton = getArguments().getString("Description"); 
    contact1 = getArguments().getString("contact1"); 
    contact2 = getArguments().getString("contact2"); 
    contact3 = getArguments().getString("contact3"); 
    contact4 = getArguments().getString("contact4"); 
    email = getArguments().getString("email"); 
    tag1 = getArguments().getString("tag1"); 
    tag2 = getArguments().getString("tag2"); 
    tag3 = getArguments().getString("tag3"); 
    tag4 = getArguments().getString("tag4"); 
    tag5 = getArguments().getString("tag5"); 
    website = getArguments().getString("website"); 

    byte[] byteArray = getArguments().getByteArray("image"); 
    Bitmap bitmap = BitmapFactory.decodeByteArray(byteArray, 0, byteArray.length); 

    companyNametxt.setText(companyName); 
    companyDescripitontxt.setText(companyDescripiton); 
    contacts.setText("Contact number(s): \n"+contact1+"\t"+contact2+"\n"+contact3+"\t"+contact4); 
    tags.setText("Tags: "+tag1+" "+tag2+" "+tag3+" "+tag4+" "+tag5); 
    websitetxt.setText(website); 
    emailtxt.setText(email); 

    logo.setImageBitmap(bitmap); 

    return rootView; 
}

しかし、それはいつも私にこのエラーが発生します

java.lang.NullPointerException 
                      at com.gawapa.servicefinder.pageTabs.TabTitle.onCreateView(TabTitle.java:42) 
                      at android.support.v4.app.Fragment.performCreateView(Fragment.java:2080) 
                      at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1108) 
                      at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1290) 
                      at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:801) 
                      at android.support.v4.app.FragmentManagerImpl.execSingleAction(FragmentManager.java:1638) 
                      at android.support.v4.app.BackStackRecord.commitNowAllowingStateLoss(BackStackRecord.java:679) 
                      at android.support.v4.app.FragmentPagerAdapter.finishUpdate(FragmentPagerAdapter.java:143) 
                      at android.support.v4.view.ViewPager.populate(ViewPager.java:1240) 
                      at android.support.v4.view.ViewPager.populate(ViewPager.java:1088) 
                      at android.support.v4.view.ViewPager.onMeasure(ViewPager.java:1614) 
                      at android.view.View.measure(View.java:16677) 
                      at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5286) 
                      at android.support.design.widget.CoordinatorLayout.onMeasureChild(CoordinatorLayout.java:700) 
                      at android.support.design.widget.HeaderScrollingViewBehavior.onMeasureChild(HeaderScrollingViewBehavior.java:90) 
                      at android.support.design.widget.AppBarLayout$ScrollingViewBehavior.onMeasureChild(AppBarLayout.java:1364) 
                      at android.support.design.widget.CoordinatorLayout.onMeasure(CoordinatorLayout.java:765) 
                      at android.view.View.measure(View.java:16677) 
                      at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5286) 
                      at android.widget.FrameLayout.onMeasure(FrameLayout.java:310) 
                      at android.support.v7.widget.ContentFrameLayout.onMeasure(ContentFrameLayout.java:135) 
                      at android.view.View.measure(View.java:16677) 
                      at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5286) 
                      at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1404) 
                      at android.widget.LinearLayout.measureVertical(LinearLayout.java:695) 
                      at android.widget.LinearLayout.onMeasure(LinearLayout.java:588) 
                      at android.view.View.measure(View.java:16677) 
                      at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5286) 
                      at android.widget.FrameLayout.onMeasure(FrameLayout.java:310) 
                      at android.view.View.measure(View.java:16677) 
                      at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5286) 
                      at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1404) 
                      at android.widget.LinearLayout.measureVertical(LinearLayout.java:695) 
                      at android.widget.LinearLayout.onMeasure(LinearLayout.java:588) 
                      at android.view.View.measure(View.java:16677) 
                      at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5286) 
                      at android.widget.FrameLayout.onMeasure(FrameLayout.java:310) 
                      at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2421) 
                      at android.view.View.measure(View.java:16677) 
                      at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:1927) 
                      at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1119) 
                      at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1301) 
                      at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1006) 
                      at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5652) 
                      at android.view.Choreographer$CallbackRecord.run(Choreographer.java:761) 
                      at android.view.Choreographer.doCallbacks(Choreographer.java:574) 
                      at android.view.Choreographer.doFrame(Choreographer.java:544) 
                      at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:747) 
                      at android.os.Handler.handleCallback(Handler.java:733) 
                      at android.os.Handler.dispatchMessage(Handler.java:95) 
                      at android.os.Looper.loop(Looper.java:136) 
                      at android.app.ActivityThread.main(ActivityThread.java:5433) 
                      at java.lang.reflect.Method.invokeNative(Native Method) 
                      at java.lang.reflect.Method.invoke(Method.java:515) 
                      at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1268)

私はここでこだわっているT_T私を助けてください。 これは

public class SectionsPagerAdapter extends FragmentPagerAdapter { 

    public SectionsPagerAdapter(FragmentManager fm) { 
     super(fm); 
    } 

    @Override 
    public Fragment getItem(int position) { 
     switch (position) { 
      case 0: 
       TabTitle tabTitle = new TabTitle(); 
       return tabTitle; 
      case 1: 
       TabPosts tabPosts = new TabPosts(); 
       return tabPosts; 
      case 2: 
       TabLocation tabLocation = new TabLocation(); 
       return tabLocation; 
      default: 
       return null; 
     } 
    } 

    @Override 
    public int getCount() { 
     // Show 3 total pages. 
     return 3; 
    } 

    @Override 
    public CharSequence getPageTitle(int position) { 
     switch (position) { 
      case 0: 
       return "ABOUT"; 
      case 1: 
       return "POSTS"; 
      case 2: 
       return "LOCATION"; 
     } 
     return null; 
    } 
}

出典

2017-09-20 Mark Dylan B Mercado

+0

私は2番目のタブに私の最初のタブからデータをブロードキャストし、同じ問題に遭遇したとアクティビティのデータを使用します。 – phpdroid

+0

[this]（https://stackoverflow.com/questions/27247065/null-pointer-exception-passing-data-from-activity-to-fragment）ページを参照してください。 –

+0

1）あなたが探しているフィールドを含むバンドルを使用していません。2）作成する 'TabLocation'のインスタンスは、ViewPagerで使用されているインスタンスではありません。あなたのアダプタコード（SectionsPagerAdapter）を投稿してください –

答えて

0
私SectionsPagerAdapterクラスで私はすでに 

companyName = this.getArguments().getString("CompanyName");

この1

Bundle bundle = this.getArguments(); 

    companyName = bundle.getString("CompanyName");

このcode`を試みたが、それはいつも再び私に同じエラーを与え、再び

@ daniel-nugentによると、あなたが作成したフラグメントにバンドルを渡す必要がありますViewPagerアダプタあなたが別の断片を作成して、アダプタの外の束を渡しているため、エラーが起こる：

Bundle bundleTitle = new Bundle(); 
... 
TabTitle tabTitle = new TabTitle(); 
tabTitle.setArguments(bundleTitle); 

Bundle bundleLocation = new Bundle(); 
... 
TabLocation tabLocation = new TabLocation(); 
tabLocation.setArguments(bundleLocation);

しかし、アダプタに、あなたは（コメントをお読みください）任意のバンドルを通過しなかった。

public class SectionsPagerAdapter extends FragmentPagerAdapter { 
    ... 
    @Override 
    public Fragment getItem(int position) { 
    switch (position) { 
     case 0: 
     TabTitle tabTitle = new TabTitle(); 
     // Where is my Arguments? 
     return tabTitle; 
     case 1: 
     TabPosts tabPosts = new TabPosts(); 
     return tabPosts; 
     case 2: 
     TabLocation tabLocation = new TabLocation(); 
     // Please, give me the arguments! 
     return tabLocation; 
     default: 
     return null; 
    } 
    } 
    ... 
}

したがって、引数を作成してアダプタに設定する必要があります。あなたはSectionsPagerAdapterコンストラクタ経由でBundleを渡すことができます。だから、バンドルパラメータでコンストラクタを作成します。

public class SectionsPagerAdapter extends FragmentPagerAdapter { 

    private Bundle bundleTitle; 
    private Bundle bundleLocation; 

    public SectionsPagerAdapter(FragmentManager fm, Bundle bundleTitle, Bundle bundleLocation) { 
     super(fm); 

     // save the bundle to local variable 
     this.bundleTitle = bundleTitle; 
     this.bundleLocation = bundleLocation; 
    } 

    @Override 
    public Fragment getItem(int position) { 
     switch (position) { 
      case 0: 
       TabTitle tabTitle = new TabTitle(); 
       // set the argument here 
       tabTitle.setArguments(bundleTitle); 
       return tabTitle; 
      case 1: 
       TabPosts tabPosts = new TabPosts(); 
       return tabPosts; 
      case 2: 
       TabLocation tabLocation = new TabLocation(); 
       // set the argument here 
       tabTitle.setArguments(bundleLocation); 
       return tabLocation; 
      default: 
       return null; 
     } 
    } 

    ... 
}

今、あなたは、バンドルを渡すために、コンストラクタを使用することができます。

mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager(), bundleTitle, bundleLocation);

出典

2017-09-20 19:51:27

+0

おめでとう！ Androidであなたの努力に幸運を祈る;） –

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