Question

该程序有一个$date->_month_length($date->year,$date->month);类，它接收来自DisplayActivity类的数据。 LoginActivity有一个DisplayActivity来显示从Fragment传递的数据。问题是LoginActivity类接收的Bundle为null。因此数据未显示在DisplayFragment中。我附上了代码。请强调错误。

Activity课程 -

DisplayActivity

public class DisplayActivity extends AppCompatActivity { private Toolbar toolbar; private Button editButton; private static Bundle infoBundle; @Override protected void onCreate(Bundle bundle) { super.onCreate(bundle); setContentView(R.layout.activity_display); infoBundle = getIntent().getExtras(); DisplayFragment details = new DisplayFragment(); details.setArguments(infoBundle); getSupportFragmentManager().beginTransaction().replace(R.id.fragment_details, details).commit(); toolbar = (Toolbar) findViewById(R.id.tool_bar); setSupportActionBar(toolbar); getSupportActionBar().setTitle("DisplayScreen"); editButton = (Button) findViewById(R.id.edit_button); editButton.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { Intent backIntent = new Intent(DisplayActivity.this, LoginActivity.class); backIntent.putExtras(infoBundle); startActivity(backIntent); finish(); } }); }课程 -

DisplayFragment

Answer 1

我提供了LoginActivity，DisplayActivity和DisplayFragment的完整代码，其中DisplayFragment接收通过DisplayActivity从LoginActivity传递的值。试试这个

LoginActivity：

public class LoginActivity extends AppCompatActivity {

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

        findViewById(R.id.btnSubmit).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Bundle bundle = new Bundle();
                bundle.putString("name", "My name is ABCD");
                Intent i = new Intent(LoginActivity.this, DisplayActivity.class);
                i.putExtras(bundle);
                startActivity(i);
            }
        });


    }
}

DisplayActivity：

public class DisplayActivity extends AppCompatActivity {

        private Button editButton;

        private Bundle infoBundle;

        @Override
        protected void onCreate(Bundle bundle) {
            super.onCreate(bundle);
            setContentView(R.layout.activity_display);


            infoBundle = getIntent().getExtras();

            Fragment fragment = getSupportFragmentManager().findFragmentById(R.id.frame_container);
            /*infoBundle = new Bundle();
            infoBundle.putString("name", "ABCD");*/
            DisplayFragment details = new DisplayFragment();
            details.setArguments(infoBundle);
            getSupportFragmentManager().beginTransaction().replace(R.id.frame_container, details).commit();

        }
    }

和DisplayFragment：

public class DisplayFragment extends Fragment {

    public static Bundle backBundle;
    private TextView mTextView, tvValue;

    public DisplayFragment() {
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        backBundle = getArguments();
    }

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

        if (backBundle != null) {
            String username = "";
            username = backBundle.getString("name");


            tvValue = (TextView) inflatedView.findViewById(R.id.tvValue);
            tvValue.setText(username);

        }
        return inflatedView;
    }

    @Override
    public void onResume() {
        super.onResume();
    }
}

请在AndroidManifest.xml中为LoginActivity和DisplayActivity添加权限

数据未从活动传递到片段

1 个答案: