Android/Kotlin - 关闭后恢复应用时变老 Activity

Question

我的问题是：

我使用 finish() 关闭 Activity，它会转到 onPause -> onStop -> onDestroy。接下来我打开应用程序，onCreate() 获取对所有视图和 context 的旧引用。

当我尝试显示简单对话框时，它抛出：

"Unable to add window -- token android.os.BinderProxy@69a156a is not valid; is your activity running?"

我也无法访问文本视图

progressText?.text = message

它得到了旧的参考 - 我使用了 clearFindViewByIdCache() - 但没有效果。

怎么了？

编辑

我尝试通过 DataSyncListener 方法 runOnUiThread 来操作视图

class MainActivity : AppCompatActivity(), DataSyncListener {
override fun onSuccess() {
    runOnUiThread {
        refreshLayout?.isRefreshing = false // it DO NOT works after reopen app, 
        syncProgressText?.visibility = View.GONE // it DO NOT works after reopen app, 
    }
}

override fun onFailure() {
    runOnUiThread {
        refreshLayout?.isRefreshing = false // it DO NOT works after reopen app, 
        syncProgressText?.visibility = View.GONE // it DO NOT works after reopen app, 
    }
}

override fun onError(message: String) {
    Logger.d(message)
    runOnUiThread {
        refreshLayout?.isRefreshing = false        // it DO NOT works after reopen app
        syncProgressText?.visibility = View.GONE   // it DO NOT works after reopen app

        displayInfoAlertWithConfirm(this@MainActivity, message, DialogInterface.OnClickListener { _, _ ->   // it DO NOT works after reopen app, throws Unable to add window
            refreshLayout?.isRefreshing = true            // it DO NOT works after reopen app
            syncProgressText?.visibility = View.VISIBLE   // it DO NOT works after reopen app
        })
    }
}

override fun onProgress(message: String) {
    runOnUiThread {
        syncProgressText?.text = message    // it DO NOT works after reopen app
    }
}


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

    setSupportActionBar(toolbar)
    refreshLayout.setOnRefreshListener({ 
        // it DO NOT works after reopen app, 
        synchronizeData() 
        })

    synchronizeData()
    syncProgressText?.text = "test" // it works after reopen app
}

override fun onPostCreate(savedInstanceState: Bundle?, persistentState: PersistableBundle?) {
    super.onPostCreate(savedInstanceState, persistentState)
    actionBarDrawerToggle?.syncState()
}


fun synchronizeData() {
    refreshLayout?.isRefreshing = true

    dataSynchronizer = DataSynchronizer.getInstance(application as MyApplication?, this)
    dataSynchronizer?.startSync()                   // background featch data
    syncProgressText?.visibility = View.VISIBLE   // it DO NOT works after reopen app
}


override fun onDestroy() {
    super.onDestroy()
    dataSynchronizer?.stopSync()    // kill background task
    clearFindViewByIdCache() // no effect
}

}

EDIT2

已修复 - DataSynchronizer 不是 GC 并保留旧引用

Answer 1

使用 syncProgressText.setText（消息），syncProgressText.text 需要可编辑，而不是字符串。

Answer 2

终于修复。感谢@Viktor，在检查了我的 DataSynchronizer.getInstance（应用程序作为 MyApplication？，这个）后，我意识到 DataSynchronizer 不是 GC——内存泄漏。所以它保留了旧的引用。现在它就像一个魅力。

Android/Kotlin - 关闭后恢复应用时变老 Activity

Android/Kotlin - get old Activity when resume app after close

android

kotlin

kotlin-android-extensions