第一天寫關於Toast的小分享

快速覆蓋

有時候想要測試一些點擊時,會用顯示Toast的方式來協助

不過Toast是必須等到前一個Toast的持續時間結束
後一個Toast才會出現

如果我點完第1個button,馬上再點第2個,就須要等前一個Toast顯示完後才會跳第二個
無法跟點擊動作連續顯示二個Toast

有時候想要迅速的查看幾個以上的動作就比較不適合
可設置一個變數專供存取toast使用,搭配cancel()與show()方法就可以比較快速的顯示出來

class MainActivity : AppCompatActivity() {

    private lateinit var toast: Toast

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

        toast = Toast.makeText(this, "", Toast.LENGTH_SHORT)

        btn_one.setOnClickListener {
            showToast("This is Button 1111")
        }

        btn_two.setOnClickListener {
            showToast("This is Button 2222")
        }
    }


    private fun showToast(string: String) {
        toast.cancel()
        toast = Toast.makeText(this, "$string", Toast.LENGTH_SHORT)
        toast.setGravity(Gravity.CENTER, 0, 0)
        toast.show()
    }
}

自定義

如果想要做點小變化,可以用自定義的layout呈現(圖片,文字等)
例如

<?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:id="@+id/custom_toast"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:background="#FFEB3B">

    <ImageView
        android:id="@+id/imageView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="8dp"
        android:layout_marginLeft="8dp"
        android:src="@drawable/ic_baseline_done_24"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.0"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.495" />

    <TextView
        android:id="@+id/textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginEnd="8dp"
        android:layout_marginRight="8dp"
        android:text="This is custom toast"
        android:textColor="@android:color/holo_orange_dark"
        android:textSize="18sp"
        android:textStyle="bold"
        app:layout_constraintBottom_toBottomOf="@+id/imageView"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toEndOf="@+id/imageView"
        app:layout_constraintTop_toTopOf="@+id/imageView" />

    <TextView
        android:id="@+id/tv_display"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="8dp"
        android:layout_marginLeft="8dp"
        android:text="TextView"
        android:textSize="18sp"
        app:layout_constraintBaseline_toBaselineOf="@+id/textView"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toEndOf="@+id/textView" />
</androidx.constraintlayout.widget.ConstraintLayout>

因爲每次點擊時,原本的toast cancel掉了
所以須要再給值toast = Toast(this)

class MainActivity : AppCompatActivity() {

    private lateinit var toast: Toast
    private lateinit var customLayout: View

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

        customLayout = layoutInflater.inflate(R.layout.custom_toast,findViewById(R.id.custom_toast))

        toast = Toast.makeText(this, "", Toast.LENGTH_SHORT)

        btn_one.setOnClickListener {
            showToast("1111")
        }

        btn_two.setOnClickListener {
            showToast("2222")
        }
    }


    private fun showToast(string: String) {
        toast.cancel()
//        toast = Toast.makeText(this, "$string", Toast.LENGTH_SHORT)
        toast = Toast(this)
        toast.view = customLayout
        customLayout.tv_display.text = string
        toast.duration = Toast.LENGTH_SHORT
        toast.setGravity(Gravity.CENTER, 0, 0)
        toast.show()
    }
}