我最近发现onActivityResult已弃用。我们该怎么处理呢?
有什么替代方案吗?
我最近发现onActivityResult已弃用。我们该怎么处理呢?
有什么替代方案吗?
当前回答
另一种方法是分3步完成。(考虑到你有一个startActivityForResult(0和onActivityResult()))
创建一个形式为var resultLauncher的变量:ActivityResultLauncher<Intent> 创建一个私有函数,在其中以这种基本格式初始化resultLauncher
resultLauncher=registerForActivityResult(ActivityResultContracts.StartActivityForResult()){result ->
// copy paste the code from the onActivityResult replacing resultcode to result.resultCode
if(result.resultcode==Activity.Result_OK){
val data=result.data // this data variable is of type intent and you can use it
}else{
//code if you do not get the data
}
}
使用startActivityForResult()返回行,并将其替换为resultLauncher.launch(intent)
其他回答
下面的代码在Kotlin片段中工作,用于检查蓝牙权限。年- 2022年
val intent = intent (BluetoothAdapter.ACTION_REQUEST_ENABLE)
registerForActivityResult(ActivityResultContracts.StartActivityForResult()) { result ->
if (result.resultCode == Activity.RESULT_OK) {
// There are no request codes
val data: Intent? = result.data
bluetoothAdapter.enable()
Toast.makeText(context, "Permission Granted: ", Toast.LENGTH_SHORT).show()
dynamicButton()
}
else{Toast.makeText(context, "You have to enable bluetooth to use this app.", Toast.LENGTH_SHORT).show()}
}.launch(intent)
如果您正在使用SMS同意API,则使用以下代码(Kotlin):
resultLauncher.launch( consentIntent
)
var resultLauncher = registerForActivityResult(ActivityResultContracts.StartActivityForResult()) { result ->
if (result.resultCode == Activity.RESULT_OK) {
// There are no request codes
// val data: Intent? = result.data
val message = result.data?.getStringExtra(SmsRetriever.EXTRA_SMS_MESSAGE)
getOtpFromMessage(message)
}
}
结合上面的答案,我有一个与旧方法兼容的方法startActivityForResult()保持使用requestCode而不改变旧的代码结构:
ActivityLauncher.class
public class ActivityLauncher {
private final ActivityResultLauncher<Intent> launcher;
private ActivityResultCallback<ActivityResult> activityResultCallback;
private ActivityLauncher(@NonNull ActivityResultCaller caller,
@NonNull ActivityResultContract<Intent, ActivityResult> contract,
@Nullable ActivityResultCallback<ActivityResult> activityResultCallback) {
this.activityResultCallback = activityResultCallback;
this.launcher = caller.registerForActivityResult(contract, this::onActivityResult);
}
public static ActivityLauncher registerActivityForResult(
@NonNull ActivityResultCaller caller) {
return new ActivityLauncher(caller, new ActivityResultContracts.StartActivityForResult(), null);
}
public void launch(Intent intent, @Nullable ActivityResultCallback<ActivityResult> activityResultCallback) {
if (activityResultCallback != null) {
this.activityResultCallback = activityResultCallback;
}
launcher.launch(intent);
}
private void onActivityResult(ActivityResult result) {
if (activityResultCallback != null) activityResultCallback.onActivityResult(result);
}
public interface OnActivityResult {
void onActivityResultCallback(int requestCode, int resultCode, Intent data);
}
}
在BaseActivity.java中代码
private final ActivityLauncher activityLauncher = ActivityLauncher.registerActivityForResult(this);
public void startActivityForResult(Intent intent, int requestCode, ActivityLauncher.OnActivityResult onActivityResult) {
activityLauncher.launch(intent, result -> onActivityResult.onActivityResultCallback(requestCode, result.getResultCode(), result.getData()));
}
最后在每个扩展BaseActivity的Activity中,实现ActivityLauncher。将覆盖函数“OnActivityResult”的名称改为“onActivityResultCallback”。还记得删除super.onActivityResult()
如何使用:startActivityForResult(intent, requestCode, this)
以下是我的解决方案:
在我们的项目中,我们有超过20次的startActivityForResult(和onActivityResult)。
我们希望尽可能少地更改代码(并继续使用请求代码),同时引入一个优雅的解决方案以供将来使用。
既然我们很多开发人员都使用BaseActivity概念——为什么不利用它呢?
下面是BaseActivity:
abstract class BaseActivity : AppCompatActivity()
{
private var requestCode: Int = -1
private var resultHandler: ActivityResultLauncher<Intent>? = null
override fun onCreate(savedInstanceState: Bundle?)
{
super.onCreate(savedInstanceState)
registerForActivityResult()
}
private fun registerForActivityResult()
{
if (shouldRegisterForActivityResult())
{
resultHandler = registerForActivityResult(ActivityResultContracts.StartActivityForResult()) { result ->
onActivityResult(result.data, requestCode, result.resultCode)
this.requestCode = -1
}
}
}
fun startActivityForResult(requestCode: Int, intent: Intent)
{
this.requestCode = requestCode
resultHandler?.launch(intent)
}
protected open fun onActivityResult(data: Intent?, requestCode: Int, resultCode: Int)
{
// For sub activities
}
protected open fun shouldRegisterForActivityResult(): Boolean
{
// Sub activities that need the onActivityResult "mechanism", should override this and return true
return false
}
}
这是SubActivity:
class SubActivity : BaseActivity()
{
companion object
{
private const val SOME_REQUEST_CODE = 300
}
private fun testActivityResult()
{
val intent = Intent(this, OtherActivity::class.java)
startActivityForResult(SOME_REQUEST_CODE, intent)
}
override fun shouldRegisterForActivityResult(): Boolean
{
return true
}
override fun onActivityResult(data: Intent?, requestCode: Int, resultCode: Int)
{
if (requestCode == SOME_REQUEST_CODE)
{
// Yes!
}
}
}
希望它能帮助到别人
在我的情况下,我试图使用意图,我直接移动到下一个活动,而不使用谷歌登录。
对我有用的是:
在OnCreate中为登录按钮设置onClickListener:
btnSignIn.setOnClickListener {
signIn()
}
private fun signIn() {
val intent = client.signInIntent
mainActivityResultLauncher.launch(intent)
}
在上面的代码中,我写了去下一个活动的意图,但我必须写client.signInIntent
var mainActivityResultLauncher = registerForActivityResult(ActivityResultContracts.StartActivityForResult()){ result ->
if(result.resultCode == Activity.RESULT_OK){
val data = result.data
val task = GoogleSignIn.getSignedInAccountFromIntent(data)
try {
// Google Sign In was successful, authenticate with Firebase
val account = task.getResult(ApiException::class.java)!!
Log.d(TAG, "firebaseAuthWithGoogle:" + account.id)
firebaseAuthWithGoogle(account.idToken!!)
} catch (e: ApiException) {
// Google Sign In failed, update UI appropriately
Log.w(TAG, "Google sign in failed", e)
}
}
}