Kotlin 设置文本
Kotlin set text
我想用 API 返回的数据更改 TextView 中的静态字符串，但它不会更改值。
代码
val stringRequest = StringRequest(
Request.Method.POST, url,
Response.Listener<String> { response ->
val responseObject = Gson().fromJson(response, DriverIncome::class.java)
val view = View.inflate(context, R.layout.fragment_home, null)
val mMonth: TextView = view.findViewById(R.id.this_month_value) as TextView
val mTotal: TextView = view.findViewById(R.id.total_price_value) as TextView
mMonth.setText(responseObject.month)
mTotal?.setText(responseObject.total)
},
Response.ErrorListener { error ->
Toast.makeText(context,"Something went wrong", Toast.LENGTH_SHORT)
.show()
}
)
我也试过 这样 mMonth.text = responseObject.month none 成功了。
更新
这里问的是我的 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"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto"
tools:context=".HomeFragment">
<ImageView
android:id="@+id/main_header"
android:layout_width="483dp"
android:layout_height="233dp"
android:contentDescription="@string/headerImage"
android:src="@drawable/main_header"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<ImageView
android:id="@+id/my_image_view"
android:layout_width="80dp"
android:layout_height="81dp"
android:layout_marginTop="60dp"
android:contentDescription="@string/avatar"
android:maxWidth="25dp"
android:maxHeight="25dp"
app:layout_constraintBottom_toBottomOf="@+id/main_header"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.879"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.043"
tools:srcCompat="@tools:sample/avatars" />
<androidx.recyclerview.widget.RecyclerView
android:id="@+id/recycler"
android:layout_width="match_parent"
android:layout_height="224dp"
android:scrollbars="vertical"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="parent"
tools:ignore="MissingConstraints" />
<TextView
android:id="@+id/userName"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="12dp"
android:text="@string/name"
android:textColor="#FFFFFF"
app:layout_constraintBottom_toTopOf="@+id/mainname"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.042"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.0" />
<TextView
android:id="@+id/mainname"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="16dp"
android:layout_marginTop="64dp"
android:text="@string/launryku"
android:textColor="#FFFFFF"
android:textFontWeight="@integer/fifty"
android:textSize="30sp"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<TextView
android:id="@+id/maindescription"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="16dp"
android:layout_marginTop="12dp"
android:text="@string/fasteasyclean"
android:textColor="#FFFFFF"
android:textFontWeight="@integer/thirthy"
android:textSize="18sp"
app:layout_constraintBottom_toBottomOf="@+id/main_header"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/mainname"
app:layout_constraintVertical_bias="0.043" />
<ImageView
android:id="@+id/bell"
android:layout_width="24dp"
android:layout_height="17dp"
android:layout_marginTop="16dp"
android:contentDescription="@string/notifications"
android:src="@drawable/notification"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.957"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<androidx.cardview.widget.CardView
android:id="@+id/this_month_income"
android:layout_width="195dp"
android:layout_height="wrap_content"
android:scaleType="fitXY"
android:textAlignment="center"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_weight="1"
app:layout_constraintTop_toBottomOf="@+id/main_header"
tools:ignore="MissingConstraints">
<TableLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:stretchColumns="1">
<TableRow>
<ImageView
android:id="@+id/month_image"
android:layout_width="0dp"
android:layout_height="100dp"
android:layout_column="1"
android:contentDescription="@string/month_image"
android:padding="3dip"
android:src="@drawable/month_income" />
</TableRow>
<TableRow>
<TextView
android:id="@+id/thismonth"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_column="1"
android:padding="3dip"
android:text="@string/thismonth"
android:textAlignment="center" />
</TableRow>
<TableRow>
<TextView
android:id="@+id/this_month_value"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_column="1"
android:gravity="bottom"
android:padding="3dip"
android:text="@string/this_month_value"
android:textAlignment="center"
tools:ignore="RtlCompat" />
</TableRow>
</TableLayout>
</androidx.cardview.widget.CardView>
<androidx.cardview.widget.CardView
android:id="@+id/total_income"
android:layout_width="195dp"
android:layout_height="wrap_content"
android:scaleType="fitXY"
android:textAlignment="center"
app:layout_constraintHorizontal_weight="1"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/main_header"
tools:ignore="MissingConstraints">
<TableLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:stretchColumns="1">
<TableRow>
<ImageView
android:id="@+id/totla_image"
android:layout_width="0dp"
android:layout_height="100dp"
android:layout_column="1"
android:contentDescription="@string/total_image"
android:padding="3dip"
android:src="@drawable/total_income" />
</TableRow>
<TableRow>
<TextView
android:id="@+id/total_price"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_column="1"
android:layout_gravity="bottom"
android:padding="3dip"
android:text="@string/totalincome"
android:textAlignment="center"
tools:ignore="RtlCompat" />
</TableRow>
<TableRow>
<TextView
android:id="@+id/total_price_value"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_column="1"
android:padding="3dip"
android:text="@string/total_price_value"
android:textAlignment="center" />
</TableRow>
</TableLayout>
</androidx.cardview.widget.CardView>
</androidx.constraintlayout.widget.ConstraintLayout>
更新 2
片段代码
override fun onCreateView(
inflater: LayoutInflater,
container: ViewGroup?,
savedInstanceState: Bundle?
): View? {
val root = inflater.inflate(R.layout.fragment_home, container, false)
callIncomeAPI()
return root
}
private fun callIncomeAPI() {
val queue = Volley.newRequestQueue(context)
var session = SessionManager(context)
session.checkLogin()
var user = session.getUserDetails()
var token: String? = user.get(SessionManager.KEY_ACCESS_TOKEN)
val tokenFull = "Bearer $token"
val url = "https://example.com/api/incomes/$tokenFull"
// Request a string response from the provided URL.
val stringRequest = StringRequest(
Request.Method.POST, url,
Response.Listener<String> { response ->
val responseObject = Gson().fromJson(response, DriverIncome::class.java)
val view = View.inflate(context, R.layout.fragment_home, null)
val mMonth: TextView = view.findViewById(R.id.this_month_value) as TextView
val mTotal: TextView = view.findViewById(R.id.total_price_value) as TextView
mMonth.setText(responseObject.month)
mTotal.setText(responseObject.total)
},
Response.ErrorListener { error ->
Toast.makeText(context,"Something went wrong", Toast.LENGTH_SHORT)
.show()
})
// Add the request to the RequestQueue.
queue.add(stringRequest)
}
可能是因为你将视图放大了两次。只需在 onCreateView 中分配 textview 即可正常工作。
private var mMonth: TextView
private var mTotal: TextView
override fun onCreateView(
inflater: LayoutInflater,
container: ViewGroup?,
savedInstanceState: Bundle?
): View? {
val root = inflater.inflate(R.layout.fragment_home, container, false)
mMonth: TextView = root.findViewById(R.id.this_month_value) as TextView
mTotal: TextView = root.findViewById(R.id.total_price_value) as TextView
callIncomeAPI()
return root
}
然后只需设置文本：
val stringRequest = StringRequest(
Request.Method.POST, url,
Response.Listener<String> { response ->
val responseObject = Gson().fromJson(response, DriverIncome::class.java)
mMonth.setText(responseObject.month)
mTotal.setText(responseObject.total)
},
Response.ErrorListener { error ->
Toast.makeText(context,"Something went wrong", Toast.LENGTH_SHORT)
.show()
})
你正在膨胀片段视图两次，使用你第一次膨胀的相同视图：
val root = inflater.inflate(R.layout.fragment_home, container, false)
使用这个 'root' 来查找文本视图而不是这样做
val view = View.inflate(context, R.layout.fragment_home, null)
view.findViewById(.....
我想用 API 返回的数据更改 TextView 中的静态字符串，但它不会更改值。
代码
val stringRequest = StringRequest(
Request.Method.POST, url,
Response.Listener<String> { response ->
val responseObject = Gson().fromJson(response, DriverIncome::class.java)
val view = View.inflate(context, R.layout.fragment_home, null)
val mMonth: TextView = view.findViewById(R.id.this_month_value) as TextView
val mTotal: TextView = view.findViewById(R.id.total_price_value) as TextView
mMonth.setText(responseObject.month)
mTotal?.setText(responseObject.total)
},
Response.ErrorListener { error ->
Toast.makeText(context,"Something went wrong", Toast.LENGTH_SHORT)
.show()
}
)
我也试过 mMonth.text = responseObject.month none 成功了。
更新
这里问的是我的 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"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto"
tools:context=".HomeFragment">
<ImageView
android:id="@+id/main_header"
android:layout_width="483dp"
android:layout_height="233dp"
android:contentDescription="@string/headerImage"
android:src="@drawable/main_header"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<ImageView
android:id="@+id/my_image_view"
android:layout_width="80dp"
android:layout_height="81dp"
android:layout_marginTop="60dp"
android:contentDescription="@string/avatar"
android:maxWidth="25dp"
android:maxHeight="25dp"
app:layout_constraintBottom_toBottomOf="@+id/main_header"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.879"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.043"
tools:srcCompat="@tools:sample/avatars" />
<androidx.recyclerview.widget.RecyclerView
android:id="@+id/recycler"
android:layout_width="match_parent"
android:layout_height="224dp"
android:scrollbars="vertical"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="parent"
tools:ignore="MissingConstraints" />
<TextView
android:id="@+id/userName"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="12dp"
android:text="@string/name"
android:textColor="#FFFFFF"
app:layout_constraintBottom_toTopOf="@+id/mainname"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.042"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.0" />
<TextView
android:id="@+id/mainname"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="16dp"
android:layout_marginTop="64dp"
android:text="@string/launryku"
android:textColor="#FFFFFF"
android:textFontWeight="@integer/fifty"
android:textSize="30sp"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<TextView
android:id="@+id/maindescription"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="16dp"
android:layout_marginTop="12dp"
android:text="@string/fasteasyclean"
android:textColor="#FFFFFF"
android:textFontWeight="@integer/thirthy"
android:textSize="18sp"
app:layout_constraintBottom_toBottomOf="@+id/main_header"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/mainname"
app:layout_constraintVertical_bias="0.043" />
<ImageView
android:id="@+id/bell"
android:layout_width="24dp"
android:layout_height="17dp"
android:layout_marginTop="16dp"
android:contentDescription="@string/notifications"
android:src="@drawable/notification"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.957"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<androidx.cardview.widget.CardView
android:id="@+id/this_month_income"
android:layout_width="195dp"
android:layout_height="wrap_content"
android:scaleType="fitXY"
android:textAlignment="center"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_weight="1"
app:layout_constraintTop_toBottomOf="@+id/main_header"
tools:ignore="MissingConstraints">
<TableLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:stretchColumns="1">
<TableRow>
<ImageView
android:id="@+id/month_image"
android:layout_width="0dp"
android:layout_height="100dp"
android:layout_column="1"
android:contentDescription="@string/month_image"
android:padding="3dip"
android:src="@drawable/month_income" />
</TableRow>
<TableRow>
<TextView
android:id="@+id/thismonth"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_column="1"
android:padding="3dip"
android:text="@string/thismonth"
android:textAlignment="center" />
</TableRow>
<TableRow>
<TextView
android:id="@+id/this_month_value"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_column="1"
android:gravity="bottom"
android:padding="3dip"
android:text="@string/this_month_value"
android:textAlignment="center"
tools:ignore="RtlCompat" />
</TableRow>
</TableLayout>
</androidx.cardview.widget.CardView>
<androidx.cardview.widget.CardView
android:id="@+id/total_income"
android:layout_width="195dp"
android:layout_height="wrap_content"
android:scaleType="fitXY"
android:textAlignment="center"
app:layout_constraintHorizontal_weight="1"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/main_header"
tools:ignore="MissingConstraints">
<TableLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:stretchColumns="1">
<TableRow>
<ImageView
android:id="@+id/totla_image"
android:layout_width="0dp"
android:layout_height="100dp"
android:layout_column="1"
android:contentDescription="@string/total_image"
android:padding="3dip"
android:src="@drawable/total_income" />
</TableRow>
<TableRow>
<TextView
android:id="@+id/total_price"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_column="1"
android:layout_gravity="bottom"
android:padding="3dip"
android:text="@string/totalincome"
android:textAlignment="center"
tools:ignore="RtlCompat" />
</TableRow>
<TableRow>
<TextView
android:id="@+id/total_price_value"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_column="1"
android:padding="3dip"
android:text="@string/total_price_value"
android:textAlignment="center" />
</TableRow>
</TableLayout>
</androidx.cardview.widget.CardView>
</androidx.constraintlayout.widget.ConstraintLayout>
更新 2
片段代码
override fun onCreateView(
inflater: LayoutInflater,
container: ViewGroup?,
savedInstanceState: Bundle?
): View? {
val root = inflater.inflate(R.layout.fragment_home, container, false)
callIncomeAPI()
return root
}
private fun callIncomeAPI() {
val queue = Volley.newRequestQueue(context)
var session = SessionManager(context)
session.checkLogin()
var user = session.getUserDetails()
var token: String? = user.get(SessionManager.KEY_ACCESS_TOKEN)
val tokenFull = "Bearer $token"
val url = "https://example.com/api/incomes/$tokenFull"
// Request a string response from the provided URL.
val stringRequest = StringRequest(
Request.Method.POST, url,
Response.Listener<String> { response ->
val responseObject = Gson().fromJson(response, DriverIncome::class.java)
val view = View.inflate(context, R.layout.fragment_home, null)
val mMonth: TextView = view.findViewById(R.id.this_month_value) as TextView
val mTotal: TextView = view.findViewById(R.id.total_price_value) as TextView
mMonth.setText(responseObject.month)
mTotal.setText(responseObject.total)
},
Response.ErrorListener { error ->
Toast.makeText(context,"Something went wrong", Toast.LENGTH_SHORT)
.show()
})
// Add the request to the RequestQueue.
queue.add(stringRequest)
}
可能是因为你将视图放大了两次。只需在 onCreateView 中分配 textview 即可正常工作。
private var mMonth: TextView
private var mTotal: TextView
override fun onCreateView(
inflater: LayoutInflater,
container: ViewGroup?,
savedInstanceState: Bundle?
): View? {
val root = inflater.inflate(R.layout.fragment_home, container, false)
mMonth: TextView = root.findViewById(R.id.this_month_value) as TextView
mTotal: TextView = root.findViewById(R.id.total_price_value) as TextView
callIncomeAPI()
return root
}
然后只需设置文本：
val stringRequest = StringRequest(
Request.Method.POST, url,
Response.Listener<String> { response ->
val responseObject = Gson().fromJson(response, DriverIncome::class.java)
mMonth.setText(responseObject.month)
mTotal.setText(responseObject.total)
},
Response.ErrorListener { error ->
Toast.makeText(context,"Something went wrong", Toast.LENGTH_SHORT)
.show()
})
你正在膨胀片段视图两次，使用你第一次膨胀的相同视图：
val root = inflater.inflate(R.layout.fragment_home, container, false)
使用这个 'root' 来查找文本视图而不是这样做
val view = View.inflate(context, R.layout.fragment_home, null)
view.findViewById(.....