Instagram 克隆。单击按钮时，为啥我不能回到上一个片段？
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【中文标题】Instagram 克隆。单击按钮时，为啥我不能回到上一个片段？【英文标题】：Instagram clone. when clicking a button, Why can't I go back to the previous fragment?Instagram 克隆。单击按钮时，为什么我不能回到上一个片段？ 【发布时间】：2020-06-25 23:53:20 【问题描述】：我真的可以在这方面使用你的帮助。 我正在制作 Instagram 克隆，我正在使用片段，我有一个用于个人资料页面。在其中，我有一个转到 AccountSettingsActivity 的按钮，您可以在其中编辑您的用户信息，我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，应用程序崩溃并出现此消息：
找不到明确的活动类 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 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()
)
【问题讨论】：
【参考方案1】：Fragment cannot be started using Intent.
你必须做以下事情
supportFragmentManager
.beginTransaction()
.add(R.id.root_layout, ProfileFragment.newInstance(), "")
.commit()
这里的add()方法第一个参数就是你要放到的容器 加载要提供其 id 的片段，第二个参数是 要加载的片段。
【讨论】：
【参考方案2】：无法找到明确的活动类 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
您需要定义其他活动。
【讨论】：
【参考方案3】：哦，天哪，这太简单了，在尝试了这么多东西之后，我在 Stack 的某个地方看到了一条评论，上面写着“你不需要 Intent，只需调用 finish()”，是的，这就是答案
【讨论】：
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