Я создаю приложение, которое принимает запрос и тег.Каждый раз, когда кто-то нажимает кнопку сохранения, он создает новую кнопку с тегом, содержащим запрос.Существует возможность отредактировать запрос и сохранить его.
Каждый раз, когда я пытаюсь отредактировать имя кнопки, вместо изменения имени я получаю новую кнопку.Я использую SharedPreferences для хранения этой информации, и я пытаюсь редактировать ее, но я все еще не уверен, содержит ли она точную информацию, такую как массив, чтобы я мог обновить GUI.Я чувствую, что упускаю что-то очевидное, но просто не могу понять, что это.
MainActivity.kt
class MainActivity : AppCompatActivity() {
//contain the user's saved feeds
private var savedFeeds: SharedPreferences? = null
var tagName:String = ""
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
savedFeeds = this.getSharedPreferences("feeds", Context.MODE_PRIVATE)
//register listeners for the Save and Clear Tags buttons
saveButton.setOnClickListener{handleSaveButtonClick()}
clearTagsButton.setOnClickListener{handleClearTagsButtonClick()}
Log.d("tag", "logging")
//add previously saved feeds to the GUI
refreshButtons(null)
}
fun copyTag (tag:String): String {
tagName = tag
Log.d("TAGClass",tagName)
return tagName
}
//recreate search tag and edit buttons for all saved feeds
//pass null to create all of them
private fun refreshButtons(newTag:String?) {
//store the saved tags in the tags array
val tags: Array<String> = savedFeeds!!.all.keys.toTypedArray()
tags.sortWith(String.CASE_INSENSITIVE_ORDER) //sort by tag
//if a new tag is being added, insert into the GUI at the appropriate location
if (newTag != null && newTag != tagName) {
var index = tags.binarySearch(newTag!!)
if (index < 0) index = -index-1
makeTagGUI(newTag!!, index)
}
else{
//display all feeds
for (index in tags.indices)
makeTagGUI(tags[index],index)
}
}
//add a new search to the saved feeds, then refresh all the button
private fun makeTag(query:String, tag:String) {
//original query will be "" if we have a new search
//getString looks up the previous value associated with tag if any
//if no value is found, the second arg is returned
val originalQuery = savedFeeds!!.getString(tag,"")
//get a SharedPreferences.Editor so we can store the new tag/query or
//the updated one
val editor = savedFeeds!!.edit()
editor.putString(tag, query)
editor.apply() //store the preferences - updates the file
//or
//savedFeeds!!.edit().putString(tag,query).apply()
//if new query add to GUI
if (originalQuery == "") {
refreshButtons(tag)
}
} //makeTag
//add a new button and corresponding edit button to the GUI
private fun makeTagGUI(tag:String, index: Int) {
//inflate new_tag_view layout
val inflater = LayoutInflater.from(applicationContext)
val newTagView = inflater.inflate(R.layout.new_tag_view,null,false)
//get newTagButton and set its text and register listener
val newTagButton = newTagView.findViewById<Button>(R.id.newTagButton)
newTagButton.text = tag
newTagButton.setOnClickListener(object: View.OnClickListener{
override fun onClick(v: View?) {
handleQueryButtonClicked(v!! as Button)
}
})
//get newTagButton and set its text and register listener
val newEditButton = newTagView.findViewById<Button>(R.id.newEditButton)
newEditButton.setText(R.string.edit)
newEditButton.setOnClickListener(object: View.OnClickListener{
override fun onClick(v: View?) {
handleEditButtonClicked(v!! as Button)
//val tagValue = copyTag(tag)
Log.d("Buttontag", tagName)
}
})
//add them to the layout
queryLinearLayout.addView(newTagView,index)
} //maketaggui
//remove all the saved searches
private fun clearButtons() {
queryLinearLayout.removeAllViews()
}
//for save button clicks
private fun handleSaveButtonClick() {
//create a tag if both the queryEditText and tagEditText are not empty
if (queryEditText.text.length > 0 &&
tagEditText.text.length > 0 ) {
makeTag(queryEditText.text.toString(),
tagEditText.text.toString())
//val copiedTag = copyTag(tagEditText.text.toString())
Log.d("TAGGED", tagName + "saveButtonClick")
//clear text
queryEditText.setText("")
tagEditText.setText("")
//dismiss the keyboard
(getSystemService(Activity.INPUT_METHOD_SERVICE) as
InputMethodManager).hideSoftInputFromWindow(tagEditText.windowToken,0)
}
else if (queryEditText.text.length < 0 &&
tagEditText.text.toString() == tagName)
{
}
else {
//display a message
val builder = AlertDialog.Builder(this@MainActivity)
builder.setTitle(R.string.missingTitle) //title bar
//ok button to dismiss the alert
builder.setPositiveButton(R.string.OK,null)
builder.setMessage(R.string.missingMessage) //message
//create the dialog
val errorDialog:AlertDialog = builder.create()
errorDialog.show()
}
}
//for each of the tag buttons, open a browser to view the feed
private fun handleQueryButtonClicked(v: Button) {
//get query
val buttonText = v.text.toString()
//val copiedTag = copyTag(v.text.toString())
Log.d("TAG", tagName + "handleQuery")
val query = savedFeeds!!.getString(buttonText,"")
//create the url
val urlString = getString(R.string.searchURL)+query
Log.d("TAG",urlString)
//create an intent to launch a browser
val webIntent = Intent(Intent.ACTION_VIEW,
Uri.parse(urlString))
startActivity(webIntent) //execute the intent
}
//handle edit button
private fun handleEditButtonClicked(v: Button) {
//get all necessary GUI components
val buttonRow = v.parent as ConstraintLayout
val searchButton = buttonRow.findViewById<Button>(R.id.newTagButton)
val tag = searchButton.text.toString()
val copiedTag = copyTag(tag)
Log.d("TAG", tagName + "handleEdit")
//set the edittexts to match the chosen tag and query
tagEditText.setText(tag)
queryEditText.setText(savedFeeds!!.getString(tag,""))
}
//handle the clear button
private fun handleClearTagsButtonClick() {
val builder = AlertDialog.Builder(this@MainActivity)
builder.setTitle(R.string.confirmTitle)
builder.setPositiveButton(R.string.erase) { dialog, which ->
clearButtons()
savedFeeds!!.edit().clear().apply()
}
builder.setCancelable(true)
builder.setNegativeButton(R.string.cancel, null)
builder.setMessage(R.string.confirmMessage)
builder.create().show()
}
} //class
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<EditText
android:layout_width="0dp"
android:layout_height="wrap_content"
android:inputType="textPersonName"
android:ems="10"
android:id="@+id/queryEditText"
android:hint="@string/queryPrompt" android:imeOptions="actionNext" android:layout_marginEnd="8dp"
app:layout_constraintEnd_toEndOf="parent" android:layout_marginStart="8dp"
app:layout_constraintStart_toStartOf="parent" android:layout_marginTop="8dp"
app:layout_constraintTop_toTopOf="parent"/>
<EditText
android:layout_width="0dp"
android:layout_height="wrap_content"
android:inputType="textPersonName"
android:ems="10"
android:id="@+id/tagEditText"
android:hint="@string/tagPrompt" android:imeOptions="actionDone"
android:layout_marginStart="8dp"
app:layout_constraintStart_toStartOf="parent" android:layout_marginTop="8dp"
app:layout_constraintTop_toBottomOf="@+id/queryEditText"/>
<Button
android:text="@string/save"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/saveButton" android:textStyle="bold"
android:textSize="18sp" app:layout_constraintStart_toEndOf="@+id/tagEditText"
android:layout_marginStart="8dp" android:layout_marginEnd="8dp" app:layout_constraintEnd_toEndOf="parent"
android:layout_marginTop="8dp" app:layout_constraintTop_toBottomOf="@+id/queryEditText"/>
<Button
android:text="@string/clearTags"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:id="@+id/clearTagsButton" app:layout_constraintEnd_toEndOf="parent" android:layout_marginEnd="8dp"
app:layout_constraintStart_toStartOf="parent" android:layout_marginStart="8dp"
android:layout_marginBottom="8dp" app:layout_constraintBottom_toBottomOf="parent"/>
<ScrollView
android:layout_width="0dp"
android:layout_height="0dp"
app:layout_constraintStart_toStartOf="parent" android:layout_marginStart="8dp"
android:layout_marginEnd="8dp" app:layout_constraintEnd_toEndOf="parent" android:layout_marginTop="8dp"
app:layout_constraintTop_toBottomOf="@+id/tagEditText" android:layout_marginBottom="8dp"
app:layout_constraintBottom_toTopOf="@+id/clearTagsButton" android:background="@color/light_orange">
<LinearLayout
android:id="@+id/queryLinearLayout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"/>
</ScrollView>
</androidx.constraintlayout.widget.ConstraintLayout>
new_tagview.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="wrap_content" android:id="@+id/newTagRow"
android:background="@android:color/transparent">
<Button
android:layout_width="0dp"
android:layout_height="wrap_content" android:id="@+id/newTagButton"
app:layout_constraintStart_toStartOf="parent" app:layout_constraintHorizontal_bias="0.5"
app:layout_constraintEnd_toStartOf="@+id/newEditButton"
app:layout_constraintHorizontal_chainStyle="spread_inside" app:layout_constraintTop_toTopOf="parent"/>
<Button
android:text="@string/edit"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/newEditButton"
app:layout_constraintStart_toEndOf="@+id/newTagButton" app:layout_constraintHorizontal_bias="0.5"
app:layout_constraintEnd_toEndOf="parent" app:layout_constraintTop_toTopOf="parent"/>
</androidx.constraintlayout.widget.ConstraintLayout>