android - 无法让绑定(bind)自动生成的类工作

Question

所以我开始了一个新项目，主要是从 https://github.com/MindorksOpenSource/android-mvvm-architecture 复制架构

我想我几乎都在编译，但由于某种原因，我的 LoginActivityBinding 类在编译时找不到，即使 IDE 似乎找到了它，它也没有显示红色文本，我可以执行 control+b，它会将我带到布局文件。

这是我的课:

public class LoginActivity extends BaseActivity<LoginActivityBinding, LoginViewModel> implements LoginNavigator {

    @Inject
    LoginViewModel loginViewModel;

    LoginActivityBinding loginActivityBinding;

    public static Intent getStartIntent(Context context) {
        Intent intent = new Intent(context, LoginActivity.class);
        return intent;
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        loginActivityBinding = getViewDataBinding();
        loginViewModel.setNavigator(this);

    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
    }

    @Override
    public void openMainActivity() {
        /*
        Intent intent = MainActivity.getStartIntent(LoginActivity.this);
        startActivity(intent);
        finish();*/
    }

    @Override
    public void handleError(Throwable throwable) {
        // handle error
    }

    @Override
    public void login() {
      /*  String email = activityLoginBinding.etEmail.getText().toString();
        String password = activityLoginBinding.etPassword.getText().toString();
        if (loginViewModel.isEmailAndPasswordValid(email, password)) {
            hideKeyboard();
            loginViewModel.login(email, password);
        } else {
            Toast.makeText(this, getString(R.string.invalid_email_password), Toast.LENGTH_SHORT).show();
        }*/
    }

    @Override
    public LoginViewModel getViewModel() {
        return loginViewModel;
    }

    @Override
    public int getBindingVariable() {
        return BR.viewModel;
    }

    @Override
    public int getLayoutId() {
        return R.layout.login_activity;
    }

}

这是它扩展的 BaseActivity:

public abstract class BaseActivity<T extends ViewDataBinding, V extends BaseViewModel> extends AppCompatActivity implements BaseFragment.Callback {

    // TODO
    // this can probably depend on isLoading variable of BaseViewModel,
    // since its going to be common for all the activities
    private ProgressDialog progressDialog;

    private T viewDataBinding;
    private V viewModel;

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        performDependencyInjection();
        super.onCreate(savedInstanceState);
        performDataBinding();
    }

    private void performDataBinding() {
        viewDataBinding = DataBindingUtil.setContentView(this, getLayoutId());
        this.viewModel = viewModel == null ? getViewModel() : viewModel;
        viewDataBinding.setVariable(getBindingVariable(), viewModel);
        viewDataBinding.executePendingBindings();
    }



    @TargetApi(Build.VERSION_CODES.M)
    public void requestPermissionsSafely(String[] permissions, int requestCode) {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            requestPermissions(permissions, requestCode);
        }
    }

    @TargetApi(Build.VERSION_CODES.M)
    public boolean hasPermission(String permission) {
        return Build.VERSION.SDK_INT < Build.VERSION_CODES.M ||
                checkSelfPermission(permission) == PackageManager.PERMISSION_GRANTED;
    }

    @Override
    public void onFragmentAttached() {

    }

    @Override
    public void onFragmentDetached(String tag) {

    }

    public void hideKeyboard() {
        View view = this.getCurrentFocus();
        if (view != null) {
            InputMethodManager imm = (InputMethodManager)
                    getSystemService(Context.INPUT_METHOD_SERVICE);
            imm.hideSoftInputFromWindow(view.getWindowToken(), 0);
        }
    }

    public void openActivityOnTokenExpire() {
        startActivity(LoginActivity.getStartIntent(this));
        finish();
    }

    public boolean isNetworkConnected() {
        return NetworkUtils.isNetworkConnected(getApplicationContext());
    }

    public void showLoading() {
        hideLoading();
        progressDialog = CommonUtils.showLoadingDialog(this);
    }

    public void hideLoading() {
        if (progressDialog != null && progressDialog.isShowing()) {
            progressDialog.cancel();
        }
    }

    public T getViewDataBinding() {
        return viewDataBinding;
    }

    /**
     * Override for set view model
     *
     * @return view model instance
     */
    public abstract V getViewModel();

    /**
     * Override for set binding variable
     *
     * @return variable id
     */
    public abstract int getBindingVariable();

    /**
     * @return layout resource id
     */
    public abstract
    @LayoutRes
    int getLayoutId();

    public void performDependencyInjection() {
        AndroidInjection.inject(this);
    }

}

这是login_activity.xml:

<layout xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:tools="http://schemas.android.com/tools"
        tools:context="mypackage.LoginActivity">
    <data>
        <import type="android.view.View"/>
        <variable
            name="viewModel"
            type="mypackage.LoginViewModel"/>
    </data>
    <LinearLayout
                  android:layout_width="match_parent"
                  android:layout_height="match_parent"
                  android:gravity="center_horizontal"
                  android:orientation="vertical"
                  android:paddingBottom="@dimen/activity_vertical_margin"
                  android:paddingLeft="@dimen/activity_horizontal_margin"
                  android:paddingRight="@dimen/activity_horizontal_margin"
                  android:paddingTop="@dimen/activity_vertical_margin"
>
        <!-- Login progress -->
        <ProgressBar
            android:id="@+id/login_progress"
            style="?android:attr/progressBarStyleLarge"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginBottom="8dp"
            android:visibility="gone"/>
        <ScrollView
            android:id="@+id/login_form"
            android:layout_width="match_parent"
            android:layout_height="match_parent">
            <LinearLayout
                android:id="@+id/email_login_form"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:orientation="vertical">
                <android.support.design.widget.TextInputLayout
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content">
                    <AutoCompleteTextView
                        android:id="@+id/email"
                        android:layout_width="match_parent"
                        android:layout_height="wrap_content"
                        android:hint="@string/prompt_email"
                        android:inputType="textEmailAddress"
                        android:maxLines="1"
                        android:singleLine="true"/>
                </android.support.design.widget.TextInputLayout>
                <android.support.design.widget.TextInputLayout
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content">
                    <EditText
                        android:id="@+id/password"
                        android:layout_width="match_parent"
                        android:layout_height="wrap_content"
                        android:hint="@string/prompt_password"
                        android:imeActionId="6"
                        android:imeActionLabel="@string/action_sign_in_short"
                        android:imeOptions="actionUnspecified"
                        android:inputType="textPassword"
                        android:maxLines="1"
                        android:singleLine="true"/>
                </android.support.design.widget.TextInputLayout>
                <Button
                    android:id="@+id/email_sign_in_button"
                    style="?android:textAppearanceSmall"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:layout_marginTop="16dp"
                    android:text="@string/action_sign_in"
                    android:onClick="@{() -> viewModel.onServerLoginClick()}"

                    android:textStyle="bold"/>
            </LinearLayout>
        </ScrollView>
    </LinearLayout>
</layout>

这是我的 gradle 文件:

apply plugin: 'com.android.application'

apply plugin: 'kotlin-android'
apply plugin: 'kotlin-kapt'


apply plugin: 'kotlin-android-extensions'

android {
    compileSdkVersion rootProject.ext.compileSdkVersion

    defaultConfig {
        applicationId "mypackage"
        minSdkVersion rootProject.ext.minSdkVersion
        targetSdkVersion rootProject.ext.targetSdkVersion
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
    dataBinding {
        enabled = true
    }
}
kapt {
    generateStubs = true
}
dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation "org.jetbrains.kotlin:kotlin-stdlib-jre7:$kotlin_version"
    implementation "com.android.support:appcompat-v7:$supportLibraryVersion"
    implementation "com.android.support:design:$supportLibraryVersion"
    implementation "com.android.support:recyclerview-v7:$rootProject.supportLibraryVersion"
    implementation "com.android.support:cardview-v7:$rootProject.supportLibraryVersion"

    //firebase and gps
    implementation "com.google.firebase:firebase-core:$googlePlayServicesVersion"

    //Viewmodel and LiveData
    implementation "android.arch.lifecycle:extensions:$rootProject.lifecycle"
    annotationProcessor "android.arch.lifecycle:compiler:$rootProject.lifecycle"

    // database
    implementation "android.arch.persistence.room:rxjava2:$rootProject.roomDatabase"
    annotationProcessor "android.arch.persistence.room:compiler:$rootProject.roomDatabase"

    // parser
    implementation "com.google.code.gson:gson:$rootProject.gsonVersion"

    // dependency injection
    implementation "com.google.dagger:dagger:$rootProject.dagger2Version"
    annotationProcessor "com.google.dagger:dagger-compiler:$rootProject.dagger2Version"
    annotationProcessor "com.google.dagger:dagger-android-processor:$rootProject.dagger2Version"
    implementation "com.google.dagger:dagger-android-support:$rootProject.dagger2Version"
    kapt "com.google.dagger:dagger-compiler:$rootProject.dagger2Version"
    kapt "com.google.dagger:dagger-android-processor:$rootProject.dagger2Version"

    // reactive
    implementation "io.reactivex.rxjava2:rxjava:$rootProject.rxjava2Version"
    implementation "io.reactivex.rxjava2:rxandroid:$rootProject.rxandroidVersion"


    //databinding
    annotationProcessor 'com.android.databinding:compiler:3.0.1'


    testImplementation "junit:junit:$junitVersion"
    androidTestImplementation 'com.android.support.test:runner:1.0.1'
    androidTestImplementation "com.android.support.test.espresso:espresso-core:$espressoVersion"
}
apply plugin: 'com.google.gms.google-services'

我错过了什么？

谢谢。

Answer 1

因为这是一个 Kotlin 项目，但我刚刚复制了一些 Java 文件，所以我决定用 Kotlin 搜索这个问题，结果发现我需要的是这一行 kapt "com.android.databinding: compiler:2.3.3" 在我的依赖项上。