在没有设置Proguard Rule的情况下，代码可以正常工作。但是，当我在发布版本中启用proguard时，该项目已成功构建。应用程序已成功安装，但在启动应用程序时每次都崩溃。
这是错误日志
2018-10-29 13:52:04.299 1942-1942/? E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.eighsquare.mcoopon, PID: 1942
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.eighsquare.mcoopon/com.eighsquare.mcoopon.ui.splash.SplashActivity}: java.lang.RuntimeException: Cannot create an instance of class com.eighsquare.mcoopon.ui.splash.a
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2778)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2856)
at android.app.ActivityThread.-wrap11(Unknown Source:0)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1589)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6494)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)
Caused by: java.lang.RuntimeException: Cannot create an instance of class com.eighsquare.mcoopon.ui.splash.a
at androidx.lifecycle.v$a.a(ViewModelProvider.java:202)
at androidx.lifecycle.v.a(ViewModelProvider.java:135)
at androidx.lifecycle.v.a(ViewModelProvider.java:103)
at com.eighsquare.mcoopon.base.BaseActivity$b.b(**BaseActivity.kt**:32)
at com.eighsquare.mcoopon.base.BaseActivity$b.a(BaseActivity.kt:16)
at kotlin.o.a(LazyJVM.kt:74)
at com.eighsquare.mcoopon.base.BaseActivity.q(Unknown Source:7)
at com.eighsquare.mcoopon.base.BaseActivity.onCreate(BaseActivity.kt:50)
at android.app.Activity.performCreate(Activity.java:7009)
at android.app.Activity.performCreate(Activity.java:7000)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1214)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2731)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2856)
at android.app.ActivityThread.-wrap11(Unknown Source:0)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1589)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6494)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)
Caused by: java.lang.NoSuchMethodException: <init> [class android.app.Application]
at java.lang.Class.getConstructor0(Class.java:2320)
at java.lang.Class.getConstructor(Class.java:1725)
at androidx.lifecycle.v$a.a(ViewModelProvider.java:200)
at androidx.lifecycle.v.a(ViewModelProvider.java:135)
at androidx.lifecycle.v.a(ViewModelProvider.java:103)
at com.eighsquare.mcoopon.base.BaseActivity$b.b(BaseActivity.kt:32)
at com.eighsquare.mcoopon.base.BaseActivity$b.a(BaseActivity.kt:16)
at kotlin.o.a(LazyJVM.kt:74)
at com.eighsquare.mcoopon.base.BaseActivity.q(Unknown Source:7)
at com.eighsquare.mcoopon.base.BaseActivity.onCreate(BaseActivity.kt:50)
at android.app.Activity.performCreate(Activity.java:7009)
at android.app.Activity.performCreate(Activity.java:7000)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1214)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2731)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2856)
at android.app.ActivityThread.-wrap11(Unknown Source:0)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1589)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6494)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)
当我单击 BaseActivity.kt 时，我将重定向到此代码
val viewModel by lazy {
if (viewModelFactory != null)
ViewModelProviders.of(this, viewModelFactory).get(mViewModelClass)
else ViewModelProviders.of(this).get(mViewModelClass)
}
此代码放置在BaseActivity中以创建Viewmodel。
这是我的BaseActivity.kt
abstract class BaseActivity<VM : ViewModel, DB : ViewDataBinding>(private val mViewModelClass: Class<VM>) : AppCompatBaseActivity() {
@LayoutRes
abstract fun getLayoutRes(): Int
abstract val viewModelFactory: ViewModelProvider.Factory?
val binding by lazy {
DataBindingUtil.setContentView(this, getLayoutRes()) as DB
}
val viewModel by lazy {
if (viewModelFactory != null)
ViewModelProviders.of(this, viewModelFactory).get(mViewModelClass)
else ViewModelProviders.of(this).get(mViewModelClass)
}
/**
* If you want to inject Dependency Injection
* on your activity, you can override this.
*/
open fun onInject() {}
open fun initView() {}
override fun onCreate(savedInstanceState: Bundle?) {
onInject()
LayoutInflaterCompat.setFactory2(layoutInflater, IconicsLayoutInflater2(delegate))
super.onCreate(savedInstanceState)
initViewModel(viewModel)
initView()
}
/**
*
* You need override this method.
* And you need to set viewModel to binding: binding.viewModel = viewModel
*
*/
abstract fun initViewModel(viewModel: VM)
fun isNetworkConnected(): Boolean {
return NetworkUtils.isNetworkConnected(this)
}
fun hideKeyboard() {
Utils.hideKeyboard(this)
}
fun changeFragment(fragment: Fragment, cleanStack: Boolean = false, addToBackStack: Boolean = true) {
Utils.changeFragment(this, fragment, cleanStack, addToBackStack)
}
}
我正在使用Dagger2 我在寻找解决方案上浪费了2个小时。 Stackoverflow是最后的希望。
答案 0 :(得分：2)
经过长时间的研究，我找到了解决方案。 我只需要在ViewModel类中添加 public @Inject构造函数 例如;
class FullScreenViewModel public @Inject constructor(application: Application) : BaseViewModel<Any?>(application) {}