Android笔记(二十七)：自定义Dialog实现居中Toast

背景

记录实现符合项目需求的Toast弹窗

具体实现

class MyTipDialog private constructor(val context: Activity): Dialog(context, R.style.MyTipTheme) {val resId = ObservableField(0)private val mainHandler = Handler(Looper.getMainLooper())init {setCanceledOnTouchOutside(true)setCancelable(true)window?.setLayout(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT)window?.setBackgroundDrawableResource(Color.parseColor("#00000000"))window?.setWindowAnimations(R.style.myTipDialogAnim)val binding = DataBindingUtil.inflate<MyTipsBinding>(layoutInflater, R.layout.my_tips, null, false)binding.viewModel = thissetContentView(binding.root)}companion object{private var instance: MyTipDialog ? = nullfun getInstance(context: Activity, resId: Int): MyTipDialog {if (instance == null){instance = MyTipDialog (context)}instance?.dismiss()instance?.resId?.set(resId)return instance!!}}override fun dispatchTouchEvent(ev: MotionEvent): Boolean {context.dispatchTouchEvent(ev)return super.dispatchTouchEvent(ev)}override fun show() {super.show()mainHandler.postDelayed({dismiss()}, 2000)}override fun dismiss() {super.dismiss()mainHandler.removeCallbacksAndMessages(null)}
}

自定义布局：R.layout.my_tips

<?xml version="1.0" encoding="utf-8"?>
<layout xmlns:android="http://schemas.android.com/apk/res/android"xmlns:tools="http://schemas.android.com/tools"><data><variablename="viewModel"type="com.masked_boy.test.MyTipsDialog" /></data><FrameLayoutandroid:layout_width="wrap_content"android:layout_height="wrap_content"><TextViewandroid:layout_width="wrap_content"android:layout_height="wrap_content"android:maxWidth="304dp"android:paddingHorizontal="20dp"android:paddingVertical="5dp"android:layout_gravity="center"android:text="@{context.getString(viewModel.resId)}"android:textSize="11sp"android:textColor="#FFFFFFFF"android:background="#000000"/></FrameLayout>
</layout>

对话框style

<?xml version="1.0" encoding="utf-8"?>
<resources xmlns:tools="http://schemas.android.com/tools"><style name="MyTipTheme" parent="AppTheme"><item name="android:windowFullscreen">false</item><item name="android:windowLightStatusBar" tools:targetApi="m">true</item></style><style name="myTipDialogAnim" mce_bogus="1" parent="android:Animation"><item name="android:windowEnterAnimation">@anim/my_tip_dialog_enter_anim</item><item name="android:windowExitAnimation">@anim/my_tip_dialog_exit_anim</item></style>
</resources>

对话框show动画R.anim.my_tip_dialog_enter_anim

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"android:duration="200"android:interpolator="@android:anim/decelerate_interpolator"><alphaandroid:fromAlpha="0"android:toAlpha="1" />
</set>

对话框dismiss动画R.anim.my_tip_dialog_exit_anim

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"android:duration="200"android:interpolator="@android:anim/decelerate_interpolator"><alphaandroid:fromAlpha="1"android:toAlpha="0" />
</set>