小编Tom*_*Tom的帖子

我有一个简单的空活动，用于检查是否需要请求权限。当registerForActivityResult被调用时，它会因错误而崩溃java.lang.IllegalStateException: LifecycleOwner com.example.app.PermsRequester@41a30da is attempting to register while current state is RESUMED. LifecycleOwners must call register before they are STARTED.根据我的研究，我想我需要检查是否savedInstanceState是null，如果是，则创建一个新的fragment? 我不确定这是否是正确的解决方案或如何实施。下面是代码：

class PermsRequester : AppCompatActivity() {
    requestPerms = false

    override fun onCreate(savedInstanceState: Bundle?) {
        setTheme(R.style.AppTheme)
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_perms_requester)

        findViewById<Button>(R.id.acceptButton).setOnClickListener { accepted() }
    }

    private fun accepted() {
        //There is code here to check if rationale dialog needs to be displayed
        //There is code here to build a mutable list …

setTargetFragment()在 Java 中已弃用，我不明白它的正确替代品，因为 android 文档使用它并且已经过时。我相信这FragmentManager是它的正确替代品。我setTargetFragment在我的设置首选项中使用已弃用的功能来创建多个首选项屏幕。为此，我最初遵循了此处的指南，该指南在setTargetFragment示例中使用起来很混乱。下面是我的代码：

build.gradle (Module: app)
...
implementation 'androidx.appcompat:appcompat:1.2.0'
implementation 'androidx.constraintlayout:constraintlayout:2.0.4'
implementation 'androidx.preference:preference:1.1.1'
...

MainActivity.kt

class MainActivity : AppCompatActivity() {
    private lateinit var settingsButton: ImageButton

    override fun onCreate(savedInstanceState: Bundle?) {
        ...
        settingsButton = findViewById(R.id.settingsButtonMain)
        settingsButton.setOnClickListener {
            settingsClicked()
        }
        ...
    }

    private fun settingsClicked() {
        val settingsIntent = Intent(this, SettingsActivity::class.java)
        startActivity(settingsIntent)
    }
}

SettingsActivity.kt

class SettingsActivity : AppCompatActivity(), PreferenceFragmentCompat.OnPreferenceStartFragmentCallback {
    override fun onCreate(savedInstanceState: Bundle?) {
        ...
        supportFragmentManager.beginTransaction().replace(R.id.settings, SettingsFragment(this)).commit()
        supportFragmentManager.addOnBackStackChangedListener …

正如标题所暗示的那样，SpeechRecognizer.isRecognitionAvailable()在 Android 11 中返回 false，我不确定为什么会这样，因为设备 (Pixel 3 XL) 可以识别语音。该文档并未表明它在 API v30 中发生了变化。奇怪的是，即使isRecognitionAvailable是false ，我仍然成功获得STT提示。下面是说明这一点的示例代码。为什么 isRecognitionAvailable 检查总是错误的？无论如何，代码都不完整，但我添加了重要的相关部分：

AndroidManifest.xml
...
<uses-permission android:name="android.permission.RECORD_AUDIO" />
...

MainActivity.kt
...
override fun onCreate(savedInstanceState: Bundle?) {
...
    if(ContextCompat.checkSelfPermission(this, Manifest.permission.RECORD_AUDIO) != PackageManager.PERMISSION_GRANTED) {
        if(shouldShowRequestPermissionRationale(Manifest.permission.RECORD_AUDIO)) { //rationale prompt
        }
        val requestPermissionLauncher = registerForActivityResult(ActivityResultContracts.RequestPermission()
        ){ isGranted: Boolean ->
            if(isGranted) { checkSTT() }
            else { //error perms not granted
            }
        requestPermissionLauncher.launch(Manifest.permission.RECORD_AUDIO)
    } else { checkSTT() }
}

private fun checkSTT() {
    if(SpeechRecognizer.isRecognitionAvailable(this)) { runSTT() }
    else …

startActivityForResult(intent: Intent!, options: Bundle?)已被弃用。我正在尝试替换为，ActivityResultLauncher但我需要通过options. 我怎样才能用新方法做到这一点？以下是原始（现已弃用）方法的示例，该方法将打开“联系人”菜单，然后根据 的值在开关中执行以下两项操作之一code：

...
val code = contactType //can be either 1 or 2
val contactsIntent = Intent(Intent.ACTION_PICK, ContactsContract.Contacts.CONTENT_URI)
contactsIntent.type = ContactsContract.CommonDataKinds.Phone.CONTENT_TYPE
startActivityForResult(contactsIntent, code)

override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
    if(resultCode == Activity.RESULT_OK) {
        when(requestCode) {
            1 -> { //Do something
            }
            2 -> { //Do something else
            }
        }
    }
}

我试图将上述内容转换为使用，ActivityResultLauncher但我还没有弄清楚如何将 的值传递code给它。以下是我到目前为止所拥有的：

val code = contactType //can be either 1 or …