我目前正在开发一个天气应用程序，我正在将我的数据与从黑暗天空获得的 API 绑定(bind)。我的 gradle 将不再构建，我不断收到相同的错误，我几乎尝试了所有方法
我尝试重命名我的 ApplicationID ，我尝试重写整个代码并从头开始。我尝试过，我认为这可能是因为我的构建路径文件夹，或者我只是没有为类型变量调用正确的东西
这是我的 Activity_main.xml 代码，它显示了如何构建应用程序。
<?xml version="1.0" encoding="utf-8"?>
<layout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools">
<data>
<variable
name = "weather"
type = "teamtreehouse.com.CurrentWeather" />
</data>
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@color/appBackgroud"
tools:context=".MainActivity">
<TextView
android:id="@+id/temperatureValue"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginLeft="8dp"
android:layout_marginTop="8dp"
android:layout_marginEnd="8dp"
android:layout_marginRight="8dp"
android:layout_marginBottom="8dp"
android:text="@{String.valueOf(Math.round(weather.temperature))"
android:textColor="@android:color/white"
android:textSize="150sp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.393"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.491" />
<ImageView
android:id="@+id/degreeImageView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginLeft="8dp"
android:layout_marginTop="35dp"
app:layout_constraintStart_toEndOf="@+id/temperatureValue"
app:layout_constraintTop_toTopOf="@+id/temperatureValue"
app:srcCompat="@drawable/degree" />
<TextView
android:id="@+id/timeValue"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginLeft="8dp"
android:layout_marginEnd="8dp"
android:layout_marginRight="8dp"
android:layout_marginBottom="8dp"
android:text="@{`At ` + String.valueOf(weather.formattedTime) + ` it will be }"
android:textColor="@color/half_white"
android:textSize="18sp"
app:layout_constraintBottom_toTopOf="@+id/temperatureValue"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent" />
<TextView
android:id="@+id/locationValue"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginLeft="8dp"
android:layout_marginEnd="8dp"
android:layout_marginRight="8dp"
android:layout_marginBottom="24dp"
android:text="Alcatraz Island, CA"
android:textColor="@android:color/white"
android:textSize="24sp"
app:layout_constraintBottom_toTopOf="@+id/timeValue"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent" />
<ImageView
android:id="@+id/iconImageView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="32dp"
android:layout_marginLeft="32dp"
android:layout_marginBottom="8dp"
app:layout_constraintBottom_toBottomOf="@+id/locationValue"
app:layout_constraintStart_toStartOf="parent"
app:srcCompat="@drawable/cloudy_night" />
<androidx.constraintlayout.widget.Guideline
android:id="@+id/guideline"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical"
app:layout_constraintGuide_percent="0.33" />
<androidx.constraintlayout.widget.Guideline
android:id="@+id/guideline2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical"
app:layout_constraintGuide_percent="0.66" />
<TextView
android:id="@+id/humidityLabel"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginLeft="8dp"
android:layout_marginTop="15dp"
android:layout_marginEnd="8dp"
android:layout_marginRight="8dp"
android:text="humidity"
android:textColor="@color/half_white"
app:layout_constraintEnd_toStartOf="@+id/guideline"
app:layout_constraintStart_toStartOf="@+id/guideline"
app:layout_constraintTop_toBottomOf="@+id/temperatureValue" />
<TextView
android:id="@+id/humidityValue"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="8dp"
android:text="@{String.valueOf(weather.humidity)"
android:textColor="@android:color/white"
android:textSize="24sp"
app:layout_constraintEnd_toEndOf="@+id/humidityLabel"
app:layout_constraintStart_toStartOf="@+id/humidityLabel"
app:layout_constraintTop_toBottomOf="@+id/humidityLabel" />
<TextView
android:id="@+id/precipLabel"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="15dp"
android:layout_marginEnd="8dp"
android:layout_marginRight="8dp"
android:text="Rain Snow?"
android:textColor="@color/half_white"
app:layout_constraintEnd_toStartOf="@+id/guideline2"
app:layout_constraintStart_toStartOf="@+id/guideline2"
app:layout_constraintTop_toBottomOf="@+id/temperatureValue" />
<TextView
android:id="@+id/precipValue"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="8dp"
android:text="@{String.valueOf(Math.round(weather.precipChance * 100)) + `%}"
android:textColor="@android:color/white"
android:textSize="24sp"
app:layout_constraintEnd_toEndOf="@+id/precipLabel"
app:layout_constraintStart_toStartOf="@+id/precipLabel"
app:layout_constraintTop_toBottomOf="@+id/precipLabel" />
<TextView
android:id="@+id/summary"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginLeft="8dp"
android:layout_marginTop="8dp"
android:layout_marginEnd="8dp"
android:layout_marginRight="8dp"
android:text="@{weather.summary}"
android:textColor="@android:color/white"
android:textSize="18dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/precipValue" />
<TextView
android:id="@+id/darkSkyAttribution"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="159dp"
android:layout_marginLeft="159dp"
android:layout_marginEnd="193dp"
android:layout_marginRight="193dp"
android:layout_marginBottom="8dp"
android:text="@string/dark_sky_messages"
android:textColor="@color/half_white"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
</layout>
这是我的主 Activity 类，其中发生一些数据绑定(bind):
package teamtreehouse.com;
import androidx.appcompat.app.AppCompatActivity;
import androidx.databinding.DataBindingUtil;
import android.content.Context;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.os.Bundle;
import android.text.method.LinkMovementMethod;
import android.util.Log;
import android.widget.TextView;
import android.widget.Toast;
import org.jetbrains.annotations.NotNull;
import org.json.JSONException;
import org.json.JSONObject;
import java.io.IOException;
import okhttp3.Call;
import okhttp3.Callback;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.Response;
import teamtreehouse.com.databinding.ActivityMainBinding;
public class MainActivity extends AppCompatActivity {
public static final String TAG = MainActivity.class.getSimpleName();
private CurrentWeather currentWeather;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
final ActivityMainBinding binding = DataBindingUtil.setContentView(MainActivity.this,
R.layout.activity_main);
TextView darkSky = findViewById(R.id.darkSkyAttribution);
// connecting the link to the web
darkSky.setMovementMethod(LinkMovementMethod.getInstance());
String apiKey = "1a7a4d3a7acf106277ead1610e04637a";
double latitude = 37.8267;
double longitude = -122.4233;
String forecastUrl = "https://api.darksky.net/forecast/"
+ apiKey + "/" + latitude +"," + longitude;
if (isNetworkAvailable()) {
OkHttpClient client = new OkHttpClient();
Request request = new Request.Builder()
.url(forecastUrl)
.build();
Call call = client.newCall(request);
call.enqueue(new Callback() {
@Override
public void onFailure(@NotNull Call call, @NotNull IOException e) {
}
@Override
public void onResponse(@NotNull Call call, @NotNull Response response) throws IOException {
try {
String jsonData = response.body().string();
Log.v(TAG, jsonData);
if (response.isSuccessful()) {
currentWeather = getCurrentDetails(jsonData);
CurrentWeather displayWeather = new CurrentWeather(
currentWeather.getLocationLabel(),
currentWeather.getIcon(),
currentWeather.getTime(),
currentWeather.getTemperature(),
currentWeather.getHumidity(),
currentWeather.getPrecipChance(),
currentWeather.getSummary(),
currentWeather.getTimeZone()
);
binding.setWeather(displayWeather);
} else {
alertUserAboutError();
}
} catch (IOException e) {
Log.e(TAG, "IO Exception caught: ", e);
}catch (JSONException e){
Log.e(TAG, "JSON Exception Caught: ", e);
}
}
});
}
Log.d(TAG, "Main UI code is running, hooray!");
}
private CurrentWeather getCurrentDetails(String jsonData) throws JSONException {
JSONObject forecast = new JSONObject(jsonData);
String timezone = forecast.getString("timezone");
Log.i(TAG, "From Json: " + timezone);
JSONObject currently = forecast.getJSONObject("currently");
CurrentWeather currentWeather = new CurrentWeather();
currentWeather.setHumidity(currently.getDouble("humidity"));
currentWeather.setTime(currently.getLong("time"));
currentWeather.setIcon(currently.getString("icon"));
currentWeather.setLocationLabel("Alcatraz Island, CA");
currentWeather.setPrecipChance(currently.getDouble("precipProbability"));
currentWeather.setSummary(currently.getString("summary"));
currentWeather.setTemperature(currently.getDouble("temperature"));
currentWeather.setTimeZone(timezone);
Log.d(TAG, currentWeather.getFormattedTime());
return currentWeather;
}
private boolean isNetworkAvailable() {
ConnectivityManager manager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo networkInfo = manager.getActiveNetworkInfo();
boolean isAvailable = false;
if(networkInfo != null && networkInfo.isConnected()){
isAvailable = true;
}
else{
Toast.makeText(this, R.string.network_unavaliable_message
,Toast.LENGTH_LONG).show();
}
return isAvailable;
}
private void alertUserAboutError() {
AlertDialogFragment dialog = new AlertDialogFragment();
dialog.show(getFragmentManager(), "error_dialog");
}
}
这是我的应用程序的 build.gradle:
apply plugin: 'com.android.application'
android {
compileSdkVersion 29
buildToolsVersion "29.0.1"
defaultConfig {
applicationId 'teamtreehouse.com.stormy'
minSdkVersion 15
targetSdkVersion 29
versionCode 1
versionName "1.0"
testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
}
}
dataBinding{
enabled = true
}
}
dependencies {
implementation fileTree(dir: 'libs', include: ['*.jar'])
implementation 'androidx.appcompat:appcompat:1.0.2'
implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
implementation("com.squareup.okhttp3:okhttp:4.0.1")
testImplementation 'junit:junit:4.12'
androidTestImplementation 'androidx.test:runner:1.2.0'
androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
}
预期的结果是让我的 gradle 正确构建并绑定(bind)数据
这是我得到的错误代码:
Found data binding errors.
****/ data binding error ****msg:Syntax error: no viable alternative at input '<EOF>'
file:C:\Users\gstest\AndroidStudioProjects\Stormy\app\src\main\res\layout\activity_main.xml
loc:57:24 - 57:84
****\ data binding error ****
error: cannot find symbol class ActivityMainBindingImpl
Caused by: org.gradle.api.tasks.TaskExecutionException: Execution failed for task ':app:compileDebugJavaWithJavac'.
at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.execute(ExecuteActionsTaskExecuter.java:95)
at org.gradle.api.internal.tasks.execution.ResolveTaskOutputCachingStateExecuter.execute(ResolveTaskOutputCachingStateExecuter.java:91)
at org.gradle.api.internal.tasks.execution.ValidatingTaskExecuter.execute(ValidatingTaskExecuter.java:57)
at org.gradle.api.internal.tasks.execution.SkipEmptySourceFilesTaskExecuter.execute(SkipEmptySourceFilesTaskExecuter.java:119)
at org.gradle.api.internal.tasks.execution.ResolvePreviousStateExecuter.execute(ResolvePreviousStateExecuter.java:43)
at org.gradle.api.internal.tasks.execution.CleanupStaleOutputsExecuter.execute(CleanupStaleOutputsExecuter.java:93)
at org.gradle.api.internal.tasks.execution.FinalizePropertiesTaskExecuter.execute(FinalizePropertiesTaskExecuter.java:45)
at org.gradle.api.internal.tasks.execution.ResolveTaskArtifactStateTaskExecuter.execute(ResolveTaskArtifactStateTaskExecuter.java:94)
at org.gradle.api.internal.tasks.execution.SkipTaskWithNoActionsExecuter.execute(SkipTaskWithNoActionsExecuter.java:56)
at org.gradle.api.internal.tasks.execution.SkipOnlyIfTaskExecuter.execute(SkipOnlyIfTaskExecuter.java:55)
at org.gradle.api.internal.tasks.execution.CatchExceptionTaskExecuter.execute(CatchExceptionTaskExecuter.java:36)
at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter$1.executeTask(EventFiringTaskExecuter.java:67)
at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter$1.call(EventFiringTaskExecuter.java:52)
at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter$1.call(EventFiringTaskExecuter.java:49)
at org.gradle.internal.operations.DefaultBuildOperationExecutor$CallableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:315)
at org.gradle.internal.operations.DefaultBuildOperationExecutor$CallableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:305)
at org.gradle.internal.operations.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:175)
at org.gradle.internal.operations.DefaultBuildOperationExecutor.call(DefaultBuildOperationExecutor.java:101)
at org.gradle.internal.operations.DelegatingBuildOperationExecutor.call(DelegatingBuildOperationExecutor.java:36)
at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter.execute(EventFiringTaskExecuter.java:49)
at org.gradle.execution.plan.LocalTaskNodeExecutor.execute(LocalTaskNodeExecutor.java:43)
at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$InvokeNodeExecutorsAction.execute(DefaultTaskExecutionGraph.java:355)
at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$InvokeNodeExecutorsAction.execute(DefaultTaskExecutionGraph.java:343)
at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$BuildOperationAwareExecutionAction.execute(DefaultTaskExecutionGraph.java:336)
at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$BuildOperationAwareExecutionAction.execute(DefaultTaskExecutionGraph.java:322)
at org.gradle.execution.plan.DefaultPlanExecutor$ExecutorWorker$1.execute(DefaultPlanExecutor.java:134)
at org.gradle.execution.plan.DefaultPlanExecutor$ExecutorWorker$1.execute(DefaultPlanExecutor.java:129)
at org.gradle.execution.plan.DefaultPlanExecutor$ExecutorWorker.execute(DefaultPlanExecutor.java:202)
at org.gradle.execution.plan.DefaultPlanExecutor$ExecutorWorker.executeNextNode(DefaultPlanExecutor.java:193)
at org.gradle.execution.plan.DefaultPlanExecutor$ExecutorWorker.run(DefaultPlanExecutor.java:129)
... 6 more
Caused by: java.lang.RuntimeException: android.databinding.tool.util.LoggedErrorException: Found data binding errors.
****/ data binding error ****msg:Syntax error: no viable alternative at input '<EOF>'
file:C:\Users\gstest\AndroidStudioProjects\Stormy\app\src\main\res\layout\activity_main.xml
loc:57:24 - 57:84
****\ data binding error ****
最佳答案
原来我只是缺少关闭 xml 文件中的消息的坟墓键 `
关于java - 我不断收到数据绑定(bind)错误，但不确定原因或如何修复它，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/57518096/