Question

我想将数据从主要活动传递到TabView的一个标签。这是我的代码，它不起作用，现在该做什么

我的代码 MainActivity：

public class MainActivity extends AppCompatActivity {

    Button button;
    EditText text;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        button= (Button) findViewById(R.id.getInfoButton);
        text= (EditText) findViewById(R.id.gitHubUserName);
        Logger.addLogAdapter(new AndroidLogAdapter());



        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {

                final String user = text.getText().toString();
                Intent in=new Intent(MainActivity.this,Tab.class);
                in.putExtra("SS",user);
                Logger.d(user);

                Bundle bundle=new Bundle();
                bundle.putString("NAME",user);
                ProfileActivity pro = new ProfileActivity();
                pro.setArguments(bundle);

                startActivity(in);
            }
        });





    }
}

我的适用于tabViews的适配器：

public class PagerAdapter extends FragmentPagerAdapter {

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

    @Override
    public Fragment getItem(int position) {
        switch (position){
            case 0:
                ProfileActivity profileActivity=new ProfileActivity();
                return profileActivity;
            case 1:
                FollowersActivity followersActivity=new FollowersActivity();
                return followersActivity;
                case 2:
                PublicRepos publicRepos=new PublicRepos();
                return publicRepos;

            default:
                return null;
        }
    }

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

    @Override
    public CharSequence getPageTitle(int position) {
        switch (position) {
            case 0:
                return "Profile Info";
            case 1:
                return "Followers";
            case 2:
                return "Public Repos";
        }
        return null;
    }
}

这是我想在主要活动中传递EditText数据的ProfileActivity：

public class ProfileActivity extends Fragment {

    ImageView imageView;
    TextView name;
    TextView bio;


    String text;

    public void dataPass(String txt){
        text = txt;
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        View rootView = inflater.inflate(R.layout.activity_profile, container, false);
        name = rootView.findViewById(R.id.name);
        bio = rootView.findViewById(R.id.bio);
        Logger.addLogAdapter(new AndroidLogAdapter());


        Bundle bundle = this.getArguments();
        String nameString = bundle.getString("NAME");
        Logger.d(nameString);
        name.setText(nameString);


        return rootView;
    }
}

当我运行应用程序时，应用程序停止工作并在logcat中出现此错误：

 java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String android.os.Bundle.getString(java.lang.String)' on a null object reference
                                                                              at com.salman.getgithubofgeek.Activity.Activity.Activites.ProfileActivity.onCreateView(ProfileActivity.java:43)

Answer 1

你不能那样使用setArguments。

这样做：

button.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View view) {

        final String user = text.getText().toString();
        Intent in=new Intent(MainActivity.this,Tab.class);
        in.putExtra("SS",user);
        in.putExtra("NAME",user);
        Logger.d(user);

        startActivity(in);
    }
});

然后在Tab活动中，将额外内容传递给适配器，无论你在哪里调用它，如下所示：

PagerAdapter adapter = new PagerAdapter(fm, user);

并对适配器类进行以下更改：

public class PagerAdapter extends FragmentPagerAdapter {
    String nameString;
    public PagerAdapter(FragmentManager fm, String nameString) {
        super(fm);
        this.nameString = nameString;
    }
    @Override
public Fragment getItem(int position) {
    switch (position){
        case 0:
            ProfileActivity profileActivity=new ProfileActivity();
            Bundle bundle=new Bundle();
            bundle.putString("NAME",nameString);
            profileActivity.setArguments(bundle);
            return profileActivity;
        case 1:
            FollowersActivity followersActivity=new FollowersActivity();
            return followersActivity;
        case 2:
            PublicRepos publicRepos=new PublicRepos();
            return publicRepos;

        default:
            return null;
    }
}

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

@Override
public CharSequence getPageTitle(int position) {
    switch (position) {
        case 0:
            return "Profile Info";
        case 1:
            return "Followers";
        case 2:
            return "Public Repos";
    }
    return null;
   }
}

Answer 2

问题是你试图在`

中的片段中添加libc

TabActivity

bundle Pager`您再次宣布没有

的ProfileActivity片段

setArguments（）

。您需要做的就是先将and in发送到bundle，然后在activity中使用ProfileActivity片段，然后将Pager设置为bundle片段。

Answer 3

Button button;
EditText text;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    button= (Button) findViewById(R.id.getInfoButton);
    text= (EditText) findViewById(R.id.gitHubUserName);
    Logger.addLogAdapter(new AndroidLogAdapter());



    button.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {

            final String user = text.getText().toString();
            Intent in=new Intent(MainActivity.this,Tab.class);
            in.putExtra("SS",user);
            Logger.d(user);
           //modification goes here
            intent.putString("NAME",user);

            startActivity(in);
        }
    });





}
}

和

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

@Override
public Fragment getItem(int position) {
    switch (position){
        case 0:
            ProfileActivity profileActivity=new ProfileActivity();
           //modifications goes here
           Bundle b = new Bundle();
            bundle.putString("NAME",user);
            profileActivity.setArguments(b);
            return profileActivity;
        case 1:
            FollowersActivity followersActivity=new FollowersActivity();
            return followersActivity;
            case 2:
            PublicRepos publicRepos=new PublicRepos();
            return publicRepos;

        default:
            return null;
    }
}

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

@Override
public CharSequence getPageTitle(int position) {
    switch (position) {
        case 0:
            return "Profile Info";
        case 1:
            return "Followers";
        case 2:
            return "Public Repos";
    }
    return null;
}
}

将数据活动传递给android中的TabView

3 个答案: