[1.7.0-feature] runCatching

Author: crazyqiang

app/src/main/java/org/ninetripods/mq/study/jetpack/mvi/MviExampleActivity.kt

@@ -18,6 +18,7 @@ import org.ninetripods.mq.study.jetpack.mvi.widget.RankAdapter
 import org.ninetripods.mq.study.kotlin.ktx.flowWithLifecycle2
 import org.ninetripods.mq.study.kotlin.ktx.id
 import org.ninetripods.mq.study.kotlin.ktx.showToast
+import org.ninetripods.mq.study.kotlin.ktx.visible
 import org.ninetripods.mq.study.util.Constant
 
 /**
@@ -73,7 +74,7 @@ class MviExampleActivity : BaseMviActivity() {
             when (state) {
                 is BannerUiState.INIT -> {}
                 is BannerUiState.SUCCESS -> {
-                    mViewPager2.visibility = View.VISIBLE
+                    mViewPager2.visible()
                     mBtnQuest.visibility = View.GONE
                     val imgs = mutableListOf<String>()
                     for (model in state.models) {

app/src/main/java/org/ninetripods/mq/study/kotlin/ktx/CommonExt.kt

@@ -1,11 +1,14 @@
 package org.ninetripods.mq.study.kotlin.ktx
 
+import android.app.Activity
 import android.content.Context
 import android.util.Log
+import android.view.View
 import android.widget.Toast
+import androidx.annotation.StringRes
 import androidx.fragment.app.Fragment
-import org.ninetripods.mq.study.kotlin.util.ScreenUtil
 import org.ninetripods.mq.study.MyApplication
+import org.ninetripods.mq.study.kotlin.util.ScreenUtil
 
 /**
  * Toast扩展函数
@@ -26,13 +29,6 @@ fun log(message: String) {
     Log.e("TTT", message)
 }
 
-/**
- * Fragment中Toast扩展函数
- */
-fun Fragment.showToast(message: String, duration: Int = Toast.LENGTH_SHORT) {
-    Toast.makeText(activity, message, duration).show()
-}
-
 fun Number.dp2px(): Int {
     return ScreenUtil.dp2px(MyApplication.getApplication(), toFloat())
 }
@@ -49,5 +45,39 @@ fun Number.px2sp(): Int {
     return ScreenUtil.px2sp(MyApplication.getApplication(), toFloat())
 }
 
+fun View?.visible() {
+    if (this?.visibility != View.VISIBLE) {
+        this?.visibility = View.VISIBLE
+    }
+}
+
+fun View?.invisible() {
+    if (this?.visibility != View.INVISIBLE) {
+        this?.visibility = View.INVISIBLE
+    }
+}
+
+fun View?.gone() {
+    if (this?.visibility != View.GONE) {
+        this?.visibility = View.GONE
+    }
+}
+
+fun Activity.showToast(msg: String, duration: Int = Toast.LENGTH_SHORT) {
+    Toast.makeText(this, msg, duration).show()
+}
+
+fun Activity.showToast(@StringRes msg: Int, duration: Int = Toast.LENGTH_SHORT) {
+    Toast.makeText(this, msg, duration).show()
+}
+
+fun Fragment.showToast(msg: String, duration: Int = Toast.LENGTH_SHORT) {
+    Toast.makeText(requireContext(), msg, duration).show()
+}
+
+fun Fragment.showToast(@StringRes message: Int, duration: Int = Toast.LENGTH_SHORT) {
+    Toast.makeText(requireContext(), message, duration).show()
+}
+
 
 

app/src/main/kotlin/org/ninetripods/mq/study/util/RunCatchException.kt

@@ -0,0 +1,32 @@
+package org.ninetripods.mq.study.util
+
+import org.ninetripods.mq.study.kotlin.ktx.log
+
+/**
+ * runCatching代替try catch的各种用法
+ * Created by mq on 2023/7/12
+ */
+class RunCatchException {
+
+    fun exceptionTest() {
+        //不需要结果
+        runCatching { 100 / 0 }
+            .onFailure { ex -> ex.printStackTrace() }
+
+        //需要结果
+        runCatching { 100 / 2 }
+            .onSuccess { value -> log("onSuccess:$value") } //runCatching{}中执行成功，并传入执行结果
+            .onFailure { exception -> log("onFailure:$exception") }//runCatching{}中执行失败，并传入exception
+            //.getOrDefault(0) //获取runCatching{}中执行的结果,如果是Failure直接返回默认值
+            .getOrElse { ex -> //获取runCatching{}中执行的结果,如果是Failure返回else内部的值。相比getOrDefault多了对exception的处理
+                log("exception:$ex")
+                100
+            }
+            //.getOrThrow()//获取runCatching{}中执行的结果,如果是Failure直接抛异常
+            //.getOrNull() //获取runCatching{}中执行的结果,如果是Failure返回null
+            //.exceptionOrNull() //如果有问题则返回exception；否则返回null
+            .run {
+                log("result:$this")
+            }
+    }
+}