迁移下一个 Java 类后：
public class ImportExportActivity extends BaseActivity
{
private String filename;
private static Intent oData;
private ActivityResultLauncher<Intent> activityResultLauncher;
private ActivityImportexportBinding binding;
@Override
protected void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setImportDataActivityResultHandler();
}
@RequiresApi(api = Build.VERSION_CODES.JELLY_BEAN)
private void setImportDataActivityResultHandler(){
activityResultLauncher =
registerForActivityResult(
new ActivityResultContracts.StartActivityForResult(),
result -> {
if (result.getResultCode() == Activity.RESULT_OK) {
Intent data = result.getData();
if (data != null) {
oData = data;
boolean hasPermission =
TMPermission.verifyStorageReadPermissions((Activity)AppSettings.getContext());
appSettings.setRequestPermissionSource(RequestPermissionSource.IMPORTDATA);
if (hasPermission) {
String strResult = TMImport.importData(data);
TMToast toast = new TMToast(AppSettings.getContext());
toast.show(strResult, Toast.LENGTH_LONG);
}
}
}
});
}
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
if(appSettings.getRequestPermissionSource()
.equals(RequestPermissionSource.IMPORTDATA)){
if (TMPermission.hasReadPermission()) {
String strResult = TMImport.importData(oData);
TMToast toast = new TMToast(this);
toast.show(strResult, Toast.LENGTH_LONG);
}
}
}
public void setActivityLayout()
{
super.setActivityLayout();
setButtonsAppearance();
}
public void setContentView()
{
binding = DataBindingUtil.setContentView(this, R.layout.activity_importexport);
}
public void setActivityBackground(){
binding.llImportExportMain.setBackgroundColor(Color.parseColor(
appSettings.mainLayoutBackgroundColor
));
}
public void createActionBar()
{
String activityTitle = TMLocale.getStringResourceByName("activityrecords_textview_importexport").toUpperCase();
TMAppearance.createActionBar(this, activityTitle);
}
public void setFooterMenu()
{
FootermenuBinding footerBinding = binding.footermenu;
TMFooter.footerBinding = new WeakReference<>(footerBinding);
TMFooter.activity = new WeakReference<>(this);
TMFooter.dialog = new WeakReference<>(dialog);
TMFooter.setFooterMenu();
}
private void setButtonsAppearance()
{
configureButton(binding.btnImport);
configureButton(binding.btnExport);
setButtonClickListener(binding.cvImport, Enum.Action.IMPORT);
setButtonClickListener(binding.cvExport, Enum.Action.EXPORT);
}
@SuppressLint("ClickableViewAccessibility")
private void setButtonClickListener(CardView button, String target)
{
button.setOnTouchListener((v, event) -> {
if (event.getAction() == MotionEvent.ACTION_DOWN) {
TMSound.playButtonSound(this);
setButtonStyle_Pressed(button);
} else {
if (event.getAction() == MotionEvent.ACTION_UP) {
setButtonStyle_Released(button);
switch (target) {
case (Enum.Action.IMPORT):
selectFile();
break;
case (Enum.Action.EXPORT):
onTouchExport();
break;
}
}
}
return true;
});
}
private void onTouchExport()
{
//check if there is data to export
TMSession us = new TMSession();
User user = us.getUserSession();
List<RecordDTO> records = UserService.getRecords(user.getId(), "");
if (records.size()>0){
exportData();
}else{
String strError = TMLocale.getStringResourceByName("activityimportexport_nodatatoexport");
TMToast toast = new TMToast(this);
toast.show(strError, Toast.LENGTH_SHORT);
}
}
private void configureButton(TextView button)
{
int dpButtonHeight = TMActivity.getButtonsHeight(3); // TMScreen.dp2px(height);
button.setHeight(dpButtonHeight);
button.setTextSize(TMAppearance.getPrefsByScreenDensity()[3]);
}
/**
* Imports records data from file into records table
*/
private void selectFile()
{
Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
intent.setType("*/*");
intent.addCategory(Intent.CATEGORY_OPENABLE);
activityResultLauncher.launch(intent);
}
private void exportData()
{
String recordsData = TMExport.getRecordsData();
try {
filename = getFilename();
File filelocation = TMFile.writeFile(this, filename, recordsData);
sendExportFileTo(filelocation);
} catch (IOException e) {
TMToast toast = new TMToast(this);
toast.show(e.getMessage(), Toast.LENGTH_SHORT);
ExceptionHandler.logException(e);
}
}
private String getFilename()
{
SimpleDateFormat formatter = new SimpleDateFormat("yyyy_MM_dd_HH_mm_ss", Locale.ENGLISH);
Date now = new Date();
return "testme_exportfile_" + formatter.format(now) + ".txt";
}
private void sendExportFileTo(File attachment)
{
Uri uri = FileProvider.getUriForFile(this, this.getApplicationContext().getPackageName() + ".provider", attachment);
Intent i = new Intent(Intent.ACTION_SEND);
i.setType("text/plain");
i.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
i.putExtra(Intent.EXTRA_EMAIL, new String[] { "" });
String subject = TMLocale.getStringResourceByName("importexport_exporttomail_subject") + " " + filename;
String body = TMLocale.getStringResourceByName("importexport_exporttomail_body");
i.putExtra(Intent.EXTRA_SUBJECT, subject);
i.putExtra(Intent.EXTRA_TEXT, body);
i.putExtra(Intent.EXTRA_STREAM, uri);
try {
this.startActivity(Intent.createChooser(i, "Send mail..."));
} catch (android.content.ActivityNotFoundException e) {
Toast.makeText(this,
TMLocale.getStringResourceByName("importexport_exporttomail_noemailclients"), Toast.LENGTH_SHORT)
.show();
ExceptionHandler.logException(e);
}
}
}
对于 Kotlin，我以 结束。下一堂课：
class ImportExportActivity : BaseActivity() {
private var filename: String? = null
private var activityResultLauncher: ActivityResultLauncher<Intent>? = null
private var binding: ActivityImportexportBinding? = null
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setImportDataActivityResultHandler()
}
private fun setImportDataActivityResultHandler() {
activityResultLauncher = registerForActivityResult<Intent, ActivityResult>(
StartActivityForResult(),
ActivityResultCallback { result: ActivityResult ->
if (result.resultCode == Activity.RESULT_OK) {
val data = result.data
if (data != null) {
oData = data
val hasPermission =
TMPermission.verifyStorageReadPermissions(AppSettings.getContext() as Activity)
appSettings.requestPermissionSource = RequestPermissionSource.IMPORTDATA
if (hasPermission) {
val strResult = TMImport.importData(data)
val toast = TMToast(AppSettings.getContext())
toast.show(strResult, Toast.LENGTH_LONG)
}
}
}
})
}
override fun onRequestPermissionsResult(
requestCode: Int,
permissions: Array<String>,
grantResults: IntArray
) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults)
if (appSettings.requestPermissionSource
== RequestPermissionSource.IMPORTDATA
) {
if (TMPermission.hasReadPermission()) {
val strResult = TMImport.importData(oData)
val toast = TMToast(this)
toast.show(strResult, Toast.LENGTH_LONG)
}
}
}
override fun setActivityLayout() {
super.setActivityLayout()
setButtonsAppearance()
}
override fun setContentView() {
binding = DataBindingUtil.setContentView(this, R.layout.activity_importexport)
}
override fun setActivityBackground() {
binding!!.llImportExportMain.setBackgroundColor(
Color.parseColor(
appSettings.mainLayoutBackgroundColor
)
)
}
override fun createActionBar() {
val activityTitle =
TMLocale.getStringResourceByName("activityrecords_textview_importexport").uppercase(
Locale.getDefault()
)
createActionBar(this, activityTitle)
}
override fun setFooterMenu() {
val footerBinding = binding!!.footermenu
TMFooter.footerBinding = WeakReference(footerBinding)
TMFooter.activity = WeakReference(this)
TMFooter.dialog = WeakReference(dialog)
TMFooter.setFooterMenu()
}
private fun setButtonsAppearance() {
configureButton(binding!!.btnImport)
configureButton(binding!!.btnExport)
setButtonClickListener(binding!!.cvImport, Enum.Action.IMPORT)
setButtonClickListener(binding!!.cvExport, Enum.Action.EXPORT)
}
@SuppressLint("ClickableViewAccessibility")
private fun setButtonClickListener(button: CardView, target: String) {
button.setOnTouchListener { v: View?, event: MotionEvent ->
if (event.action == MotionEvent.ACTION_DOWN) {
TMSound.playButtonSound(this)
setButtonStyle_Pressed(button)
} else {
if (event.action == MotionEvent.ACTION_UP) {
setButtonStyle_Released(button)
when (target) {
Enum.Action.IMPORT -> selectFile()
Enum.Action.EXPORT -> onTouchExport()
}
}
}
true
}
}
private fun onTouchExport() {
//check if there is data to export
val us = TMSession()
val user = us.userSession
val records = UserService.getRecords(user.id, "")
if (records.size > 0) {
exportData()
} else {
val strError = TMLocale.getStringResourceByName("activityimportexport_nodatatoexport")
val toast = TMToast(this)
toast.show(strError, Toast.LENGTH_SHORT)
}
}
private fun configureButton(button: TextView) {
val dpButtonHeight = getButtonsHeight(3) // TMScreen.dp2px(height);
button.height = dpButtonHeight
button.textSize = prefsByScreenDensity[3].toFloat()
}
/**
* Imports records data from file into records table
*/
private fun selectFile() {
val intent = Intent(Intent.ACTION_GET_CONTENT)
intent.type = "*/*"
intent.addCategory(Intent.CATEGORY_OPENABLE)
activityResultLauncher!!.launch(intent)
}
private fun exportData() {
val recordsData = TMExport.getRecordsData()
try {
filename = getFilename()
val filelocation = TMFile.writeFile(this, filename, recordsData)
sendExportFileTo(filelocation)
} catch (e: IOException) {
val toast = TMToast(this)
toast.show(e.message, Toast.LENGTH_SHORT)
ExceptionHandler.logException(e)
}
}
private fun getFilename(): String {
val formatter = SimpleDateFormat("yyyy_MM_dd_HH_mm_ss", Locale.ENGLISH)
val now = Date()
return "testme_exportfile_" + formatter.format(now) + ".txt"
}
private fun sendExportFileTo(attachment: File) {
val uri = FileProvider.getUriForFile(
this,
this.applicationContext.packageName + ".provider",
attachment
)
val i = Intent(Intent.ACTION_SEND)
i.type = "text/plain"
i.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION)
i.putExtra(Intent.EXTRA_EMAIL, arrayOf(""))
val subject =
TMLocale.getStringResourceByName("importexport_exporttomail_subject") + " " + filename
val body = TMLocale.getStringResourceByName("importexport_exporttomail_body")
i.putExtra(Intent.EXTRA_SUBJECT, subject)
i.putExtra(Intent.EXTRA_TEXT, body)
i.putExtra(Intent.EXTRA_STREAM, uri)
try {
this.startActivity(Intent.createChooser(i, "Send mail..."))
} catch (e: ActivityNotFoundException) {
Toast.makeText(
this,
TMLocale.getStringResourceByName("importexport_exporttomail_noemailclients"),
Toast.LENGTH_SHORT
)
.show()
ExceptionHandler.logException(e)
}
}
companion object {
private var oData: Intent? = null
}
}
并且“registerForActivityResult”不再被编译器识别。
正如我在这里读到的：Android ActivityResult API 未解决的参考错误 registerForActivityResult
解决方案通过在 build.gradle 中导入接下来的两个包：
api 'androidx.activity:activity-ktx:1.6.0-alpha05'
api 'androidx.fragment:fragment-ktx:1.5.0-rc01'
然后让你的 Activity 扩展 ComponentActivity。
好吧，我尝试了这个解决方案并且它有效，现在可以识别“registerforactivityresult”，但是我无法从
ComponentActivityBaseActivityBaseActivityAppCompatActivityComponentActivity 这么说，鉴于我的场景，我陷入了困境，不知道如何在 Kotlin 中使用
registerforactivityresult编辑1：
这是我的 build.gradle 支持部分：
api 'androidx.legacy:legacy-support-v4:1.0.0'
api 'androidx.appcompat:appcompat:1.4.2'
api 'androidx.cardview:cardview:1.0.0'
api 'androidx.recyclerview:recyclerview:1.2.1'
api 'androidx.preference:preference-ktx:1.2.0'
编辑2：
不确定这是否是最终的解决方案，但在
AppCompatActivityComponentActivityBaseActivity编辑3：
用
AppCompatActivityComponentActivityComponentActivityFragmentActivity编辑4：
我完整的build.gradle：
apply plugin: 'com.android.application'
apply plugin: 'kotlin-android'
android {
compileSdkVersion 32
def code
Properties versionProps = new Properties()
def versionPropsFile = file('version.properties')
if (versionPropsFile.exists())
versionProps.load(new FileInputStream(versionPropsFile))
code = (versionProps['VERSION_CODE'] ?: "0").toInteger()+ 1
packagingOptions {
resources {
pickFirsts += ['META-INF/LICENSE.txt']
excludes += ['META-INF/NOTICE.md', 'META-INF/LICENSE.md', 'META-INF/INDEX.LIST', 'META-INF/DEPENDENCIES', 'META-INF/io.netty.versions.properties']
}
}
versionProps['VERSION_CODE'] = code.toString()
versionProps.store(versionPropsFile.newWriter(), null)
defaultConfig {
applicationId 'com.xxx.xxx'
minSdkVersion 26
targetSdkVersion 32
multiDexEnabled true
versionCode code
versionName "3.0." + code
compileOptions {
sourceCompatibility JavaVersion.VERSION_1_8
targetCompatibility JavaVersion.VERSION_1_8
}
}
bundle {
density {
// Different APKs are generated for devices with different screen densities; true by default.
enableSplit true
}
abi {
// Different APKs are generated for devices with different CPU architectures; true by default.
enableSplit true
}
language {
// This is disabled so that the App Bundle does NOT split the APK for each language.
// We're gonna use the same APK for all languages.
enableSplit false
}
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
applicationVariants.all { variant ->
variant.outputs.all { output ->
project.ext { appName = 'xxx' }
def newName = 'xxx.apk'
outputFileName = new File("./build/", newName)
}
}
}
debug {
}
}
productFlavors {
}
dataBinding{
enabled = true
}
lint {
abortOnError false
checkReleaseBuilds false
}
namespace 'com.xxx.xxx'
}
dependencies {
api files('libs/achartengine-1.2.0.jar')
api 'com.facebook.android:facebook-android-sdk:14.0.0'
//mail API 16
implementation 'com.sun.mail:android-mail:1.6.7'
implementation 'com.sun.mail:android-activation:1.6.7'
//apache commons text
implementation group: 'org.apache.commons', name: 'commons-text', version: '1.9'
//Youtube player
api 'com.thefinestartist:ytpa:1.2.1'
//Font Selector List Preference
//api 'com.vanniktech:vntfontlistpreference:1.0.0'
//Rate my app
api 'com.github.hotchemi:android-rate:1.0.1'
//Support
api 'androidx.legacy:legacy-support-v4:1.0.0'
api 'androidx.appcompat:appcompat:1.4.2'
api 'androidx.cardview:cardview:1.0.0'
api 'androidx.recyclerview:recyclerview:1.2.1'
api 'androidx.preference:preference-ktx:1.2.0'
//Annotation
api 'androidx.annotation:annotation:1.4.0'
//AlertDialog
api 'com.github.d-max:spots-dialog:1.1@aar'
//glide animated gifs
api 'com.github.bumptech.glide:glide:4.13.2'
annotationProcessor 'com.github.bumptech.glide:compiler:4.13.2'
//circular score
api 'com.wssholmes.stark:circular-score:0.1.1'
api 'com.google.android.material:material:1.6.1'
api 'com.github.mejdi14:Flat-Dialog-Android:1.0.5'
//picasso
api 'com.squareup.picasso:picasso:2.71828'
//Gson
implementation 'com.google.code.gson:gson:2.9.0'
//Stream
api 'com.annimon:stream:1.2.2'
api 'androidx.activity:activity-ktx:1.6.0-alpha05'
api 'androidx.activity:activity-ktx:1.4.0'
api 'androidx.fragment:fragment-ktx:1.5.0-rc01'
/*implementation 'jp.wasabeef:picasso-transformations:2.4.0'*/
//zoom
//implementation 'com.alexvasilkov:gesture-views:2.8.2'
//implementation 'com.otaliastudios:zoomlayout:1.8.0'
//Multidex
implementation "androidx.multidex:multidex:2.0.1"
implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
implementation project(':Global')
implementation project(':DTO')
implementation project(':Common')
implementation project(':Background')
implementation project(':Services')
}
奇怪的是，即使出现 lint 错误，应用程序也可以正常构建，但由于我正在迁移过程中，还无法测试 registerForActivityResult，但我想它很可能无法工作。
编辑5：
在下一个 Google 页面中： https://developer.android.com/jetpack/androidx/releases/activity
说：
"The registerForActivityResult() API has been renamed to rememberLauncherForActivityResult()..."
但同样的情况也发生在rememberLauncherForActivityResult上，它没有找到。我完全被困住了。
编辑6：
据我所读，也许这只是一个“视觉”问题，比如说 Android Studio IDE 问题，因为应用程序构建得很好（不过，我还没有测试过 registerForActivityResult），但无论如何我厌倦了谷歌。
随着时间的推移，软件包每次都会更快地被标记为过时，而令人惊奇的是“替代”并不总是有效。
目前，我将保留我的“registerForActivityResult”问题（因为我别无选择），但老实说，在我看来，Google 不鼓励我们开发者保持我们的应用程序最新。
我最终为此函数创建了一个扩展：
fun <I, O> Activity.registerForActivityResult(
contract: ActivityResultContract<I, O>,
callback: ActivityResultCallback<O>
) = (this as ComponentActivity).registerForActivityResult(contract, callback)
AndroidStudio 似乎存在一个未解决的错误： 错误：尽管具有所需的依赖项，但无法在大型项目上找到 registerForActivityResult