Question

我已经用kotline在Android Studio中编写了一个小应用程序，但该应用程序无法在仿真手机中启动。我已激活Logcat并收到一些警告或失败。它工作了1天，没有问题，我只是添加了addCart方法。我的编程时间大约为3个月，只知道基本知识，因此我不得不自己解决一个问题，因此无法解决。

我会给你我的代码和日志。如果他没有引起问题，我不需要代码方面的帮助。到时候我会好起来的：）

代码如下：

主要：

class MainActivity : AppCompatActivity() {

    private val tag ="Main_Activity"
    private val shoppingCard = mutableListOf<Item>()
    private var txtPrice = 0.0

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        val addButton  = findViewById<Button>(R.id.addButton)
        val showButton = findViewById<Button>(R.id.showButton)

        addButton.setOnClickListener { Log.d(tag, "addButton was pressed");addCart(shoppingCard)}
        showButton.setOnClickListener { Log.d(tag, "showButton was pressed");printList(shoppingCard)}
    }

    private fun addCart(shoppingCard: MutableList<Item>){
         val name = editProductText.toString()
         val pr = editPriceText.toString()
         val price      = pr.toDouble()



        val p = Item(name,price)
        shoppingCard.add(p)
        calcPrice(shoppingCard)
    }

    private fun printList(shoppingCard: MutableList<Item>)
    {
       for(Item in shoppingCard.indices)println("The name of the product is ${shoppingCard[Item].name} and the price is
${shoppingCard[Item].price}")
    }

    private fun calcPrice(shoppingCard: MutableList<Item>)
    {
        for(Item in shoppingCard.indices) txtPrice+shoppingCard[Item].price
    }

    private fun removeItem(shoppingCard: MutableList<Item>, Item: Item)
    {
        shoppingCard.remove(Item)
        txtPrice - Item.price
    } 
}

物品类别：

class Item(name: String,price: Doubleuble ) {

    val name = name
    val price = price 
}

主要活动XML：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingLeft="16dp"
    android:paddingRight="16dp"
    android:orientation="vertical"
    >


    <TextView
            android:text="Product Name"
            android:layout_width="match_parent"
            android:layout_height="wrap_content" android:id="@+id/Name"/>
    <EditText
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:inputType="textPersonName"
            android:text="Type Here"
            android:ems="10"
            android:id="@+id/editProductText"/>
    <TextView
            android:text="Price"
            android:layout_width="match_parent"
            android:layout_height="wrap_content" android:id="@+id/Price"/>
    <EditText
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:inputType="numberDecimal"
            android:ems="10"
            android:id="@+id/editPriceText"/>
    <Button
            android:text="Add"
            android:layout_width="match_parent"
            android:layout_height="wrap_content" android:id="@+id/addButton"/>
    <Button
            android:text="SHOW SHOPPING CART"
            android:layout_width="match_parent"
            android:layout_height="wrap_content" android:id="@+id/showButton"/>
    <TextView
            android:layout_width="match_parent"
            android:layout_height="38dp" android:id="@+id/txtPrice"/> </LinearLayout>

以下是日志：

E/NetworkScheduler: Invalid component specified.

2019-04-24 16:28:26.944 1592-3964/? E/AudioFlinger: not enough memory for AudioTrack size=131296

2019-04-24 16:28:26.946 1592-3964/? E/AudioFlinger: createRecordTrack_l() initCheck failed -12; no control block?
2019-04-24 16:28:26.969 1592-4736/? I/AudioFlinger: AudioFlinger's thread 0xe6d83340 tid=4736 ready to run
2019-04-24 16:28:26.984 3095-3206/? E/IAudioFlinger: createRecord returned error -12
2019-04-24 16:28:26.984 3095-3206/? E/AudioRecord: AudioFlinger could not create record track, status: -12
2019-04-24 16:28:26.987 3095-3206/? E/AudioRecord-JNI: Error creating AudioRecord instance: initialization check failed with status -12.
2019-04-24 16:28:27.004 3095-3206/? E/android.media.AudioRecord: Error code -20 when initializing native AudioRecord object.

Android Studio不打开应用程序，而是打开模拟器

0 个答案: