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我跟着this指南将Facebook登录按钮添加到我的Android项目中，似乎Facebook Studio方法无法被Android Studio识别。例如，对于MainActivity.java文件中的任何Facebook方法，我都会收到警告消息“无法解析符号'TextView'”，并且我收到的所有针对MainActivity.java的Gradle生成错误似乎都会出现从导入Facebook SDK失败。我真的不明白我做错了什么;看下面的代码。为什么Facebook SDK无法导入我的Android项目？
的MainActivity.java文件，其中使用来自Facebook的SDK导入方法：
package com.checkit.ben.checkit;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
public class MainActivity extends ActionBarActivity {
private TextView info;
private LoginButton loginbutton;
private CallbackManager callbackManager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
com.facebook.FacebookSdk.sdkInitialize(getApplicationContext());
setContentView(R.layout.activity_main);
callbackManager = CallbackManager.Factory.create();
info = (TextView)findViewById(R.id.info);
loginButton = (LoginButton)findViewById(R.id.login_button);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
callbackManager.onActivityResult(requestCode, resultCode, data);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
loginButton.registerCallback(callbackManager, new FacebookCallback<LoginResult>() {
@Override
public void onSuccess(LoginResult loginResult) {
info.setText(
"User ID: "
+ loginResult.getAccessToken().getUserId()
+ "\n" +
"Auth Token: "
+ loginResult.getAccessToken().getToken()
);
}
@Override
public void onCancel()
{
info.setText("Login attempt canceled.");
}
@Override
public void onError(FacebookException e)
{
info.setText("Login attempt failed.");
}
}
}
应用程序级的build.gradle文件
apply plugin: 'com.android.application'
android {
compileSdkVersion 22
buildToolsVersion "22.0.1"
defaultConfig {
applicationId "com.checkit.ben.checkit"
minSdkVersion 9
targetSdkVersion 22
versionCode 1
versionName "1.0"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
}
repositories {
mavenCentral();
}
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar']);
compile 'com.android.support:appcompat-v7:22.1.1';
compile 'com.facebook.android:facebook-android-sdk:4.3.0';
}
摇篮控制台错误在该项目试图建立日志：
Executing tasks: [clean, :app:compileDebugSources, :app:compileDebugAndroidTestSources]
Configuration on demand is an incubating feature.
:app:clean
:app:preBuild UP-TO-DATE
:app:preDebugBuild UP-TO-DATE
:app:checkDebugManifest
:app:preReleaseBuild UP-TO-DATE
:app:prepareComAndroidSupportAppcompatV72211Library
:app:prepareComAndroidSupportSupportV42211Library
:app:prepareComFacebookAndroidFacebookAndroidSdk430Library
:app:prepareDebugDependencies
:app:compileDebugAidl
:app:compileDebugRenderscript
:app:generateDebugBuildConfig
:app:generateDebugAssets UP-TO-DATE
:app:mergeDebugAssets
:app:generateDebugResValues UP-TO-DATE
:app:generateDebugResources
:app:mergeDebugResources
:app:processDebugManifest
:app:processDebugResources
:app:generateDebugSources
:app:processDebugJavaRes UP-TO-DATE
:app:compileDebugJava
/Users/ben/AndroidStudioProjects/CheckIt/app/src/main/java/com/checkit/ben/checkit/MainActivity.java:50: error: <identifier> expected
loginButton.registerCallback(callbackManager, new FacebookCallback<LoginResult>() {
^
/Users/ben/AndroidStudioProjects/CheckIt/app/src/main/java/com/checkit/ben/checkit/MainActivity.java:50: error: <identifier> expected
loginButton.registerCallback(callbackManager, new FacebookCallback<LoginResult>() {
^
/Users/ben/AndroidStudioProjects/CheckIt/app/src/main/java/com/checkit/ben/checkit/MainActivity.java:50: error: illegal start of type
loginButton.registerCallback(callbackManager, new FacebookCallback<LoginResult>() {
^
/Users/ben/AndroidStudioProjects/CheckIt/app/src/main/java/com/checkit/ben/checkit/MainActivity.java:50: error: ')' expected
loginButton.registerCallback(callbackManager, new FacebookCallback<LoginResult>() {
^
/Users/ben/AndroidStudioProjects/CheckIt/app/src/main/java/com/checkit/ben/checkit/MainActivity.java:50: error: ';' expected
loginButton.registerCallback(callbackManager, new FacebookCallback<LoginResult>() {
^
/Users/ben/AndroidStudioProjects/CheckIt/app/src/main/java/com/checkit/ben/checkit/MainActivity.java:50: error: <identifier> expected
loginButton.registerCallback(callbackManager, new FacebookCallback<LoginResult>() {
^
/Users/ben/AndroidStudioProjects/CheckIt/app/src/main/java/com/checkit/ben/checkit/MainActivity.java:50: error: illegal start of type
loginButton.registerCallback(callbackManager, new FacebookCallback<LoginResult>() {
^
/Users/ben/AndroidStudioProjects/CheckIt/app/src/main/java/com/checkit/ben/checkit/MainActivity.java:50: error: <identifier> expected
loginButton.registerCallback(callbackManager, new FacebookCallback<LoginResult>() {
^
/Users/ben/AndroidStudioProjects/CheckIt/app/src/main/java/com/checkit/ben/checkit/MainActivity.java:50: error: ';' expected
loginButton.registerCallback(callbackManager, new FacebookCallback<LoginResult>() {
^
/Users/ben/AndroidStudioProjects/CheckIt/app/src/main/java/com/checkit/ben/checkit/MainActivity.java:79: error: class, interface, or enum expected
}
^
10 errors
FAILED
FAILURE: Build failed with an exception.
* What went wrong:
Execution failed for task ':app:compileDebugJava'.
> Compilation failed; see the compiler error output for details.
* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.
感谢您的帮助。