Instagram克隆。单击按钮时，为什么不能返回上一个片段？

问题描述 投票：0回答：2

我真的可以在这方面使用您的帮助。我正在制作Instagram克隆，正在使用片段，个人资料页面有一个片段。在其中，我有一个转到AccountSettingsActivity的按钮，您可以在其中编辑用户信息，还有一个按钮来保存更改，另一个按钮返回到配置文件片段，但是当我使用后者时，应用程序崩溃并且出现此消息：

无法找到明确的活动类别{academy.epicprogramming.kynoanimalrescue / academy.epicprogramming.kynoanimalrescue.fragments.ProfileFragment}；您是否在AndroidManifest.xml中声明了此活动？

这是清单文件：

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="academy.epicprogramming.kynoanimalrescue">

<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

<application
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:roundIcon="@mipmap/ic_launcher_round"
    android:supportsRtl="true"
    android:theme="@style/AppTheme">
<!--        <activity-->
<!--            android:name=".Main2Activity"-->
<!--            android:label="@string/title_activity_main2"></activity>-->
    <activity android:name=".AccountSettingsActivity" />
    <meta-data
        android:name="com.google.android.geo.API_KEY"
        android:value="AIzaSyBYtQl--ajXZy1uzOZoXSNGJLCeyAHUV9s" />
    <meta-data
        android:name="com.google.android.gms.version"
        android:value="@integer/google_play_services_version" />

    <activity android:name=".Login.SignUpActivity" />
    <activity android:name=".Login.SignInActivity" />
    <activity android:name=".Intro.IntroSlider" />
    <activity android:name=".MainActivity" />
    <activity
        android:name=".Intro.SplashScreen"
        android:theme="@style/Theme.AppCompat.Light.NoActionBar">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
    <activity android:name="com.theartofdev.edmodo.cropper.CropImageActivity"
        android:theme="@style/Base.Theme.AppCompat"/> <!-- optional (needed if default theme         has no action bar) -->

</application>

</manifest>

这是返回到ProfileFragment文件的按钮

close_profile_btn.setOnClickListener {

        val intent = Intent(this@AccountSettingsActivity, ProfileFragment::class.java)
        startActivity(intent)
        finish()
    }

这是完整的AccountSettingsActivity文件

class AccountSettingsActivity : AppCompatActivity() {

private lateinit var firebaseUser: FirebaseUser
private var checker = ""
private var myUrl = ""
private var imageUri: Uri? = null
private var storageProfilePictureRef: StorageReference? = null


override fun onCreate(savedInstanceState: Bundle?)
{
    super.onCreate(savedInstanceState)
    setContentView(R.layout.activity_account_settings)


    firebaseUser = FirebaseAuth.getInstance().currentUser!!
    storageProfilePictureRef =
        FirebaseStorage.getInstance().reference.child("Profile Pictures")

    logout_btn.setOnClickListener {
        FirebaseAuth.getInstance().signOut()

        val intent = Intent(this@AccountSettingsActivity, ProfileFragment::class.java)
        intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK or Intent.FLAG_ACTIVITY_NEW_TASK)
        startActivity(intent)
        finish()
    }

    close_profile_btn.setOnClickListener {

        val intent = Intent(this@AccountSettingsActivity, ProfileFragment::class.java)
        startActivity(intent)
        finish()
    }

    change_image_text_btn.setOnClickListener {
        checker = "clicked"

        CropImage.activity()
            .setAspectRatio(1, 1)
            .start(this@AccountSettingsActivity)
    }

    save_info_profile_btn.setOnClickListener {
        if (checker == "clicked") {
            updateImageAndInfo()
        } else {
            updateUserInfoOnly()
        }
    }

    userInfo()
}


override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
    super.onActivityResult(requestCode, resultCode, data)

    if (requestCode == CropImage.CROP_IMAGE_ACTIVITY_REQUEST_CODE  &&  resultCode == Activity.RESULT_OK  &&  data != null)
    {
        val result = CropImage.getActivityResult(data)
        imageUri = result.uri
        profile_image_view_profile_frag.setImageURI(imageUri)
    }
}


private fun updateUserInfoOnly() {

    when {
        full_name_profile_frag.text.toString() == "" -> Toast.makeText(
            this,
            "Please enter your name",
            Toast.LENGTH_LONG
        ).show()

        username_profile_frag.text.toString() == "" -> Toast.makeText(
            this,
            "Please enter your username",
            Toast.LENGTH_LONG
        ).show()

        bio_profile_frag.text.toString() == "" -> {
            bio_profile_frag.setText("Estoy usando Kyno animal rescue")
            val usersRef =
                FirebaseDatabase.getInstance().reference.child("Users")
            val userMap = HashMap<String, Any>()
            userMap["fullname"] = full_name_profile_frag.text.toString().toLowerCase()
            userMap["username"] = username_profile_frag.text.toString()
            userMap["bio"] = bio_profile_frag.text.toString()

            usersRef.child(firebaseUser.uid).updateChildren(userMap)

            Toast.makeText(this, "Account information successfully updated", Toast.LENGTH_LONG)
                .show()

            val intent = Intent(this@AccountSettingsActivity, MainActivity::class.java)
            startActivity(intent)
            finish()
        }

        else -> {
            val usersRef =
                FirebaseDatabase.getInstance().reference.child("Users")
            val userMap = HashMap<String, Any>()
            userMap["fullname"] = full_name_profile_frag.text.toString().toLowerCase()
            userMap["username"] = username_profile_frag.text.toString()
            userMap["bio"] = bio_profile_frag.text.toString()

            usersRef.child(firebaseUser.uid).updateChildren(userMap)

            Toast.makeText(this, "Account information successfully updated", Toast.LENGTH_LONG)
                .show()

            val intent = Intent(this@AccountSettingsActivity, MainActivity::class.java)
            startActivity(intent)
            finish()
        }
    }

}
private fun userInfo() {
    val usersRef =
        FirebaseDatabase.getInstance().getReference().child("Users").child(firebaseUser.uid)
    usersRef.addValueEventListener(object : ValueEventListener {
        override fun onDataChange(dataSnapshot: DataSnapshot) {

            if (dataSnapshot.exists()) {
                val user = dataSnapshot.getValue<User>(User::class.java)
                Picasso.get().load(user!!.getImage()).placeholder(R.drawable.profile)
                    .into(profile_image_view_profile_frag)
                full_name_profile_frag.setText(user.getFullname())
                username_profile_frag.setText(user.getUsername())
                bio_profile_frag.setText(user.getBio())
            }
        }

        override fun onCancelled(p0: DatabaseError) {
        }
    })
}

private fun updateImageAndInfo() {

    when {
        imageUri == null -> Toast.makeText(
            this,
            "Please choose a picture",
            Toast.LENGTH_LONG
        ).show()

        full_name_profile_frag.text.toString() == "" -> Toast.makeText(
            this,
            "Please enter your name",
            Toast.LENGTH_LONG
        ).show()

        username_profile_frag.text.toString() == "" -> Toast.makeText(
            this,
            "Please enter your username",
            Toast.LENGTH_LONG
        ).show()

        bio_profile_frag.text.toString() == "" -> {
            Toast.makeText(
                this,
                "Please enter your bio",
                Toast.LENGTH_LONG
            ).show()
        }

//            CODE TO SET A DEFAULT BIO IF USER DOESN'T ENTER ONE
//            bio_profile_frag.text.toString() == "" -> {
//                bio_profile_frag.setText("Estoy usando Kyno animal rescue")
//
//                val usersRef =
//                    FirebaseDatabase.getInstance().reference.child("Users")
//                val userMap = HashMap<String, Any>()
//                userMap["fullname"] = full_name_profile_frag.text.toString().toLowerCase()
//                userMap["username"] = username_profile_frag.text.toString()
//                userMap["bio"] = bio_profile_frag.text.toString()
//
//                usersRef.child(firebaseUser.uid).updateChildren(userMap)
//
//                Toast.makeText(this, "Account information successfully updated", Toast.LENGTH_LONG)
//                    .show()
//
//                val intent = Intent(this@AccountSettingsActivity, MainActivity::class.java)
//                startActivity(intent)
//                finish()
//            }
        else -> {
            val progressDialog = ProgressDialog(this)
            progressDialog.setTitle("Account Settings")
            progressDialog.setMessage("Please wait while your profile updates")
            progressDialog.show()

            val fileRef = storageProfilePictureRef!!.child(firebaseUser!!.uid + ".jpg")

            var uploadTask: StorageTask<*>
            uploadTask = fileRef.putFile(imageUri!!)

            uploadTask.continueWithTask(Continuation <UploadTask.TaskSnapshot, Task<Uri>>{ task ->
                if (!task.isSuccessful)
                {
                    task.exception?.let {
                        throw it
                        progressDialog.dismiss()
                    }
                }
                return@Continuation fileRef.downloadUrl
            }).addOnCompleteListener (OnCompleteListener<Uri> {task ->
                if (task.isSuccessful)
                {
                    val downloadUrl = task.result
                    myUrl = downloadUrl.toString()

                    val ref = FirebaseDatabase.getInstance().reference.child("Users")

                        val userMap = HashMap<String, Any>()
                        userMap["fullname"] =
                            full_name_profile_frag.text.toString().toLowerCase()
                        userMap["username"] = username_profile_frag.text.toString()
                        userMap["bio"] = bio_profile_frag.text.toString()
                        userMap["image"] = myUrl

                        ref.child(firebaseUser.uid).updateChildren(userMap)

                        Toast.makeText(
                                this,
                                "Account information successfully updated",
                                Toast.LENGTH_LONG
                            )
                            .show()

                        val intent =
                            Intent(this@AccountSettingsActivity, MainActivity::class.java)
                        startActivity(intent)
                        finish()

                        progressDialog.dismiss()

                    } else {
                        progressDialog.dismiss()
                    }

                }
            )
        }
    }
}

}

kotlin button fragment
2个回答
0
投票

Fragment cannot be started using Intent.

您必须执行以下操作

supportFragmentManager
          .beginTransaction()
          .add(R.id.root_layout, ProfileFragment.newInstance(), "")
          .commit()

这里的add（）方法的第一个参数是您要放置的容器加载要提供其ID的片段，第二个参数是要加载的片段。

0
投票

无法找到明确的活动类别{academy.epicprogramming.kynoanimalrescue / academy.epicprogramming.kynoanimalrescue.fragments.ProfileFragment}；您是否在AndroidManifest.xml中声明了此活动？

如果这是问题，那么您必须在清单文件中定义活动

您需要定义其余的活动。

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