Kotlin-Android第一个应用程序TextView按钮应用程序在点击按钮后崩溃。

huangapple
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英文:

Kotlin-Android First App TextView Button app crashed after clicking button

问题

I am new to android studio, just installed and my first app crashed after clicking the button
I added some imports but didnt work. Can anybody help ? I installed the lastest ver of andriod studio flamingo , kotlin-android-extensions didnt work anymore I think

build.gradle(:app)

  1. plugins {
  2.     id 'com.android.application'
  3.     id 'org.jetbrains.kotlin.android'
  4.     id 'kotlin-parcelize'
  5. }
  7. android {
  8.     namespace 'com.example.myapplication'
  9.     compileSdk 33
  11.     defaultConfig {
  12.         applicationId "com.example.myapplication"
  13.         minSdk 23
  14.         targetSdk 33
  15.         versionCode 1
  16.         versionName "1.0"
  18.         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
  19.     }
  20.     buildFeatures {
  21.         viewBinding true
  22.     }
  23.     buildTypes {
  24.         release {
  25.             minifyEnabled false
  26.             proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
  27.         }
  28.     }
  29.     compileOptions {
  30.         sourceCompatibility JavaVersion.VERSION_1_8
  31.         targetCompatibility JavaVersion.VERSION_1_8
  32.     }
  33.     kotlinOptions {
  34.         jvmTarget = '1.8'
  35.     }
  36. }
  38. dependencies {
  40.     implementation 'androidx.core:core-ktx:1.8.0'
  41.     implementation 'androidx.appcompat:appcompat:1.6.1'
  42.     implementation 'com.google.android.material:material:1.5.0'
  43.     implementation 'androidx.constraintlayout:constraintlayout:2.1.3'
  44.     testImplementation 'junit:junit:4.13.2'
  45.     androidTestImplementation 'androidx.test.ext:junit:1.1.5'
  46.     androidTestImplementation 'androidx.test.espresso:espresso-core:3.5.1'
  47. }

mainacitivity.kt

  1. package com.example.myapplication
  3. import android.os.Bundle
  4. import android.view.View
  5. import androidx.appcompat.app.AppCompatActivity
  6. import android.widget.TextView
  8. class MainActivity : AppCompatActivity() {
  9.     private lateinit var textView : TextView
  10.     override fun onCreate(savedInstanceState: Bundle?) {
  11.         super.onCreate(savedInstanceState)
  12.         setContentView(R.layout.activity_main)
  13.     }
  15.     fun degistir(view : View){
  16.         textView.text = "Hi Android"
  17.     }
  18. }
英文:

I am new to android studio, just installed and my first app crashed after clicking the button
I added some imports but didnt work. Can anybody help ? I installed the lastest ver of andriod studio flamingo , kotlin-android-extensions didnt work anymore I think

build.gradle(:app)

  1. plugins {
  2.     id 'com.android.application'
  3.     id 'org.jetbrains.kotlin.android'
  4.     id 'kotlin-parcelize'
  6. }
  8. android {
  9.     namespace 'com.example.myapplication'
  10.     compileSdk 33
  12.     defaultConfig {
  13.         applicationId "com.example.myapplication"
  14.         minSdk 23
  15.         targetSdk 33
  16.         versionCode 1
  17.         versionName "1.0"
  19.         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
  20.     }
  21.     buildFeatures {
  22.         viewBinding true
  23.     }
  24.     buildTypes {
  25.         release {
  26.             minifyEnabled false
  27.             proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
  28.         }
  29.     }
  30.     compileOptions {
  31.         sourceCompatibility JavaVersion.VERSION_1_8
  32.         targetCompatibility JavaVersion.VERSION_1_8
  33.     }
  34.     kotlinOptions {
  35.         jvmTarget = '1.8'
  36.     }
  37. }
  39. dependencies {
  41.     implementation 'androidx.core:core-ktx:1.8.0'
  42.     implementation 'androidx.appcompat:appcompat:1.6.1'
  43.     implementation 'com.google.android.material:material:1.5.0'
  44.     implementation 'androidx.constraintlayout:constraintlayout:2.1.3'
  45.     testImplementation 'junit:junit:4.13.2'
  46.     androidTestImplementation 'androidx.test.ext:junit:1.1.5'
  47.     androidTestImplementation 'androidx.test.espresso:espresso-core:3.5.1'
  48. }

mainacitivity.kt

  3. package com.example.myapplication
  5. import android.os.Bundle
  6. import android.view.View
  7. import androidx.appcompat.app.AppCompatActivity
  8. import android.widget.TextView
  11. class MainActivity : AppCompatActivity() {
  12.     private lateinit var textView : TextView
  13.     override fun onCreate(savedInstanceState: Bundle?) {
  14.         super.onCreate(savedInstanceState)
  15.         setContentView(R.layout.activity_main)
  16.     }
  19.     fun degistir(view : View){
  20.         textView.text = "Hi Android"
  21.     }
  23. }

答案1

得分: 0

初始化您的textView使用findviewbyId，然后尝试在其上设置文本。

英文:

Initialize your textView using findviewbyId , then try setting text on it.

huangapple
  • 本文由 发表于 2023年7月14日 04:27:40
  • 转载请务必保留本文链接：https://go.coder-hub.com/76683017.html
  • android
  • button
  • crash
  • kotlin
  • textview
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