java - Android Studio : How to get EditText values from Fragment 1 to Fragment 2 respectively on button clicked

Question

当单击按钮时，我试图获取从 fragment 1 到 fragment 2 的编辑信息。

要编辑详细信息(需要首先进入个人资料页面，通过单击抽屉导航标题处的 ImageView ):

1. 着陆页是个人资料 (Fragment2)
2. 点击编辑按钮前往编辑个人资料(Fragment1)
3. 将显示编辑个人资料(Fragment1)
4. 编辑信息
5. 点击完成
6. 个人资料(Fragment2)将显示已编辑的详细信息

这是代码:

MainActivity，其中 Fragment2 可以使用抽屉导航标题打开

protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
//        ActionBar actionBar = getSupportActionBar();
//        actionBar.setDisplayShowHomeEnabled(true);
//        actionBar.setIcon(R.mipmap.ic_launcher);
        setSupportActionBar(toolbar);

        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();
            }
        });

        final DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
        ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
                this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
        drawer.addDrawerListener(toggle);
        toggle.syncState();

        NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
        navigationView.setNavigationItemSelectedListener(this);
        View header_view = navigationView.getHeaderView(0);
        ImageView img = (ImageView) header_view.findViewById(R.id.profile_image);
        img.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                DrawerLayout drawer = (DrawerLayout)findViewById(R.id.drawer_layout);
                FragmentManager fragmentManager = getFragmentManager();fragmentManager.beginTransaction()
                        .replace(R.id.content_frame
                                , profile)
                        .commit();
                drawer.closeDrawer(GravityCompat.START);
            }
        });

    }

编辑配置文件( fragment 1)

public class EditProfile extends Fragment implements OnClickListener {
    View myView; //A view object called myView

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, Bundle savedInstanceState) {
        myView = inflater.inflate(R.layout.editprofile, container, false);
        Button btn = (Button) myView.findViewById(R.id.btnEPDone);
        btn.setOnClickListener(new OnClickListener(){
            @Override
            public void onClick(View view) {
                EditText editName = (EditText) myView.findViewById(R.id.editName);
                EditText editDate = (EditText)myView.findViewById(R.id.editDOB);

                Profile profile = new Profile();
                Bundle args = new Bundle();
                args.putString("name", editName.getText().toString());
                args.putString("date", editDate.getText().toString());
                profile.setArguments(args);
                FragmentManager fragmentManager = getFragmentManager();fragmentManager.beginTransaction()
                        .replace(R.id.content_frame
                                , profile)
                        .commit();
            }
        });
        return myView;
    }
}

配置文件( fragment 2)

public class Profile extends Fragment implements View.OnClickListener{
    View myView; //A view object called myView

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, Bundle savedInstanceState) {
        myView = inflater.inflate(R.layout.profile, container, false);
        TextView txtName = (TextView) myView.findViewById(R.id.viewName);
        txtName.setText(getArguments().getString("name"));
        TextView txtDate = (TextView) myView.findViewById(R.id.viewDOB);
        txtDate.setText(getArguments().getString("date"));
        Button btn = (Button) myView.findViewById(R.id.btnVPDone);
        btn.setOnClickListener(new View.OnClickListener(){
            @Override
            public void onClick(View view) {
                FragmentManager fragmentManager = getFragmentManager();fragmentManager.beginTransaction()
                        .replace(R.id.content_frame
                                , new EditProfile())
                        .commit();
            }
        });
        return myView;
    }
}

Logcat

    11/26 16:19:41: Launching app
$ adb install-multiple -r -t -p com.example.hci /Users/Desktop/HCI/app/build/intermediates/split-apk/debug/slices/slice_9.apk 
Split APKs installed
$ adb shell am start -n "com.example.hci/com.example.hci.MainActivity" -a android.intent.action.MAIN -c android.intent.category.LAUNCHER
Client not ready yet..Waiting for process to come online
Connected to process 4411 on device emulator-5554
Capturing and displaying logcat messages from application. This behavior can be disabled in the "Logcat output" section of the "Debugger" settings page.
I/zygote: Not late-enabling -Xcheck:jni (already on)
W/zygote: Unexpected CPU variant for X86 using defaults: x86
I/InstantRun: starting instant run server: is main process
D/OpenGLRenderer: HWUI GL Pipeline
I/zygote: android::hardware::configstore::V1_0::ISurfaceFlingerConfigs::hasWideColorDisplay retrieved: 0
I/OpenGLRenderer: Initialized EGL, version 1.4
D/OpenGLRenderer: Swap behavior 1
W/OpenGLRenderer: Failed to choose config with EGL_SWAP_BEHAVIOR_PRESERVED, retrying without...
D/OpenGLRenderer: Swap behavior 0
D/EGL_emulation: eglCreateContext: 0x944c8f00: maj 2 min 0 rcv 2
D/EGL_emulation: eglMakeCurrent: 0x944c8f00: ver 2 0 (tinfo 0xaf637820)
D/EGL_emulation: eglMakeCurrent: 0x944c8f00: ver 2 0 (tinfo 0xaf637820)
I/zygote: Do partial code cache collection, code=11KB, data=20KB
I/zygote: After code cache collection, code=11KB, data=20KB
I/zygote: Increasing code cache capacity to 128KB
I/zygote: Do partial code cache collection, code=11KB, data=38KB
I/zygote: After code cache collection, code=11KB, data=38KB
I/zygote: Increasing code cache capacity to 256KB
I/zygote: JIT allocated 71KB for compiled code of void android.widget.TextView.<init>(android.content.Context, android.util.AttributeSet, int, int)
I/zygote: Compiler allocated 4MB to compile void android.widget.TextView.<init>(android.content.Context, android.util.AttributeSet, int, int)
I/zygote: Do full code cache collection, code=91KB, data=57KB
I/zygote: After code cache collection, code=89KB, data=43KB
D/AndroidRuntime: Shutting down VM
E/AndroidRuntime: FATAL EXCEPTION: main
                  Process: com.example.hci, PID: 4411
                  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.example.hci.Profile.onCreateView(Profile.java:31)
                      at android.app.Fragment.performCreateView(Fragment.java:2508)
                      at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:1279)
                      at android.app.FragmentManagerImpl.addAddedFragments(FragmentManager.java:2407)
                      at android.app.FragmentManagerImpl.executeOpsTogether(FragmentManager.java:2186)
                      at android.app.FragmentManagerImpl.removeRedundantOperationsAndExecute(FragmentManager.java:2142)
                      at android.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:2043)
                      at android.app.FragmentManagerImpl$1.run(FragmentManager.java:719)
                      at android.os.Handler.handleCallback(Handler.java:790)
                      at android.os.Handler.dispatchMessage(Handler.java:99)
                      at android.os.Looper.loop(Looper.java:164)
                      at android.app.ActivityThread.main(ActivityThread.java:6494)
                      at java.lang.reflect.Method.invoke(Native Method)
                      at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438)
                      at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)
Application terminated.

[已解决]在Fragment1中编辑名称和日期后，名称和日期的 TextView 都显示编辑的日期，而不是Fragment2中分别显示的名称和日期。

我编辑详细信息(名称和日期)，单击按钮后，详细信息将显示在 fragment 2(个人资料)上。查看fragment2(个人资料)的详细信息后，我想再次编辑，但这次我只编辑了一个详细信息(即日期)。单击 fragment 1(编辑个人资料)中的按钮后， TextView (日期)会更新，但 fragment 2(个人资料)中的 TextView (名称)为空白。

是否可以保存第一次编辑详细信息，并在进行第二次编辑后显示它？

当我单击抽屉导航标题转到个人资料 (Fragment2) 时，应用程序崩溃

如何解决这些问题？

Answer 1

您的 ProfileFragment 类应该具有接受 Bundle 作为参数的静态方法，如下所示:

public static ProfileFragment newInstance(@Nullable Bundle bundle) {
    ProfileFragment fragment = new ProfileFragment();
    fragment.setArguments(bundle);
    return fragment;
}

在您的 EditProfileFragment 中，您应该调用此:

ProfileFragment profile = ProfileFragment.newInstance(bundleValues);
FragmentManager fragmentManager = getFragmentManager();fragmentManager.beginTransaction()
        .replace(R.id.content_frame
        , profile)
        .commit();