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生成Project时，：app：compileDebugJava错误。 它显示错误：包android.support.v7.app不存在

[英]While building Project, error in :app:compileDebugJava. It says error: package android.support.v7.app does not exist

 原文  2015-02-10 23:28:59  4   2    android/ android-studio

问题描述

I have all the required dependencies in the Module Settings. 我在模块设置中具有所有必需的依赖项。 I have also installed all the support libraries using the sdk manager. 我还使用sdk管理器安装了所有支持库。

I get the following output from the Gradle Console 我从Gradle控制台获得以下输出 

Executing tasks: [:app:assembleDebug]

Configuration on demand is an incubating feature.
:app:preBuild
:app:compileDebugNdk
:app:preDebugBuild
:app:checkDebugManifest
:app:preReleaseBuild
:app:prepareComAndroidSupportAppcompatV72103Library UP-TO-DATE
:app:prepareComAndroidSupportSupportV42103Library UP-TO-DATE
:app:prepareComGoogleAndroidGmsPlayServices6587Library UP-TO-DATE
:app:prepareDebugDependencies
:app:compileDebugAidl UP-TO-DATE
:app:compileDebugRenderscript UP-TO-DATE
:app:generateDebugBuildConfig UP-TO-DATE
:app:generateDebugAssets UP-TO-DATE
:app:mergeDebugAssets UP-TO-DATE
:app:generateDebugResValues UP-TO-DATE
:app:generateDebugResources UP-TO-DATE
:app:mergeDebugResources UP-TO-DATE
:app:processDebugManifest UP-TO-DATE
:app:processDebugResources UP-TO-DATE
:app:generateDebugSources UP-TO-DATE
:app:compileDebugJava
/Users/AMTAGRWL/Downloads/Dropbox/GT:CLASSES/Spring 2015/CS 2340/git/TrueProjectUnicorn/ShoppingWithFriends/app/src/main/java/com/projectunicorn/shoppingwithfriends/LoginConfim.java:4: error: package android.support.v7.app does not exist
import android.support.v7.app.ActionBarActivity;
                             ^
/Users/AMTAGRWL/Downloads/Dropbox/GT:CLASSES/Spring 2015/CS 2340/git/TrueProjectUnicorn/ShoppingWithFriends/app/src/main/java/com/projectunicorn/shoppingwithfriends/LoginConfim.java:11: error: cannot find symbol
public class LoginConfim extends ActionBarActivity {
                                 ^
  symbol: class ActionBarActivity
/Users/AMTAGRWL/Downloads/Dropbox/GT:CLASSES/Spring 2015/CS 2340/git/TrueProjectUnicorn/ShoppingWithFriends/app/src/main/java/com/projectunicorn/shoppingwithfriends/RegistrationScreen.java:4: error: package android.support.v7.app does not exist
import android.support.v7.app.ActionBarActivity;
                             ^
/Users/AMTAGRWL/Downloads/Dropbox/GT:CLASSES/Spring 2015/CS 2340/git/TrueProjectUnicorn/ShoppingWithFriends/app/src/main/java/com/projectunicorn/shoppingwithfriends/RegistrationScreen.java:11: error: cannot find symbol
public class RegistrationScreen extends ActionBarActivity {
                                        ^
  symbol: class ActionBarActivity
/Users/AMTAGRWL/Downloads/Dropbox/GT:CLASSES/Spring 2015/CS 2340/git/TrueProjectUnicorn/ShoppingWithFriends/app/src/main/java/com/projectunicorn/shoppingwithfriends/WelcomeScreen.java:4: error: package android.support.v7.app does not exist
import android.support.v7.app.ActionBarActivity;
                             ^
/Users/AMTAGRWL/Downloads/Dropbox/GT:CLASSES/Spring 2015/CS 2340/git/TrueProjectUnicorn/ShoppingWithFriends/app/src/main/java/com/projectunicorn/shoppingwithfriends/WelcomeScreen.java:11: error: cannot find symbol
public class WelcomeScreen extends ActionBarActivity {
                                   ^
  symbol: class ActionBarActivity
/Users/AMTAGRWL/Downloads/Dropbox/GT:CLASSES/Spring 2015/CS 2340/git/TrueProjectUnicorn/ShoppingWithFriends/app/src/main/java/com/projectunicorn/shoppingwithfriends/LoginConfim.java:13: error: method does not override or implement a method from a supertype
    @Override
    ^
/Users/AMTAGRWL/Downloads/Dropbox/GT:CLASSES/Spring 2015/CS 2340/git/TrueProjectUnicorn/ShoppingWithFriends/app/src/main/java/com/projectunicorn/shoppingwithfriends/LoginConfim.java:15: error: cannot find symbol
        super.onCreate(savedInstanceState);
        ^
  symbol:   variable super
  location: class LoginConfim
/Users/AMTAGRWL/Downloads/Dropbox/GT:CLASSES/Spring 2015/CS 2340/git/TrueProjectUnicorn/ShoppingWithFriends/app/src/main/java/com/projectunicorn/shoppingwithfriends/LoginConfim.java:16: error: cannot find symbol
        setContentView(R.layout.activity_login_confim);
        ^
  symbol:   method setContentView(int)
  location: class LoginConfim
/Users/AMTAGRWL/Downloads/Dropbox/GT:CLASSES/Spring 2015/CS 2340/git/TrueProjectUnicorn/ShoppingWithFriends/app/src/main/java/com/projectunicorn/shoppingwithfriends/LoginConfim.java:20: error: method does not override or implement a method from a supertype
    @Override
    ^
/Users/AMTAGRWL/Downloads/Dropbox/GT:CLASSES/Spring 2015/CS 2340/git/TrueProjectUnicorn/ShoppingWithFriends/app/src/main/java/com/projectunicorn/shoppingwithfriends/LoginConfim.java:23: error: cannot find symbol
        getMenuInflater().inflate(R.menu.menu_login_confim, menu);
        ^
  symbol:   method getMenuInflater()
  location: class LoginConfim
/Users/AMTAGRWL/Downloads/Dropbox/GT:CLASSES/Spring 2015/CS 2340/git/TrueProjectUnicorn/ShoppingWithFriends/app/src/main/java/com/projectunicorn/shoppingwithfriends/LoginConfim.java:27: error: method does not override or implement a method from a supertype
    @Override
    ^
/Users/AMTAGRWL/Downloads/Dropbox/GT:CLASSES/Spring 2015/CS 2340/git/TrueProjectUnicorn/ShoppingWithFriends/app/src/main/java/com/projectunicorn/shoppingwithfriends/LoginConfim.java:39: error: cannot find symbol
        return super.onOptionsItemSelected(item);
               ^
  symbol:   variable super
  location: class LoginConfim
/Users/AMTAGRWL/Downloads/Dropbox/GT:CLASSES/Spring 2015/CS 2340/git/TrueProjectUnicorn/ShoppingWithFriends/app/src/main/java/com/projectunicorn/shoppingwithfriends/LoginConfim.java:43: error: cannot find symbol
        startActivity(new Intent(getApplicationContext(), WelcomeScreen.class));
                                 ^
  symbol:   method getApplicationContext()
  location: class LoginConfim
/Users/AMTAGRWL/Downloads/Dropbox/GT:CLASSES/Spring 2015/CS 2340/git/TrueProjectUnicorn/ShoppingWithFriends/app/src/main/java/com/projectunicorn/shoppingwithfriends/LoginConfim.java:43: error: cannot find symbol
        startActivity(new Intent(getApplicationContext(), WelcomeScreen.class));
        ^
  symbol:   method startActivity(Intent)
  location: class LoginConfim
/Users/AMTAGRWL/Downloads/Dropbox/GT:CLASSES/Spring 2015/CS 2340/git/TrueProjectUnicorn/ShoppingWithFriends/app/src/main/java/com/projectunicorn/shoppingwithfriends/RegistrationScreen.java:13: error: method does not override or implement a method from a supertype
    @Override
    ^
/Users/AMTAGRWL/Downloads/Dropbox/GT:CLASSES/Spring 2015/CS 2340/git/TrueProjectUnicorn/ShoppingWithFriends/app/src/main/java/com/projectunicorn/shoppingwithfriends/RegistrationScreen.java:15: error: cannot find symbol
        super.onCreate(savedInstanceState);
        ^
  symbol:   variable super
  location: class RegistrationScreen
/Users/AMTAGRWL/Downloads/Dropbox/GT:CLASSES/Spring 2015/CS 2340/git/TrueProjectUnicorn/ShoppingWithFriends/app/src/main/java/com/projectunicorn/shoppingwithfriends/RegistrationScreen.java:16: error: cannot find symbol
        setContentView(R.layout.activity_registration_screen);
        ^
  symbol:   method setContentView(int)
  location: class RegistrationScreen
/Users/AMTAGRWL/Downloads/Dropbox/GT:CLASSES/Spring 2015/CS 2340/git/TrueProjectUnicorn/ShoppingWithFriends/app/src/main/java/com/projectunicorn/shoppingwithfriends/RegistrationScreen.java:20: error: method does not override or implement a method from a supertype
    @Override
    ^
/Users/AMTAGRWL/Downloads/Dropbox/GT:CLASSES/Spring 2015/CS 2340/git/TrueProjectUnicorn/ShoppingWithFriends/app/src/main/java/com/projectunicorn/shoppingwithfriends/RegistrationScreen.java:23: error: cannot find symbol
        getMenuInflater().inflate(R.menu.menu_registration_screen, menu);
        ^
  symbol:   method getMenuInflater()
  location: class RegistrationScreen
/Users/AMTAGRWL/Downloads/Dropbox/GT:CLASSES/Spring 2015/CS 2340/git/TrueProjectUnicorn/ShoppingWithFriends/app/src/main/java/com/projectunicorn/shoppingwithfriends/RegistrationScreen.java:27: error: method does not override or implement a method from a supertype
    @Override
    ^
/Users/AMTAGRWL/Downloads/Dropbox/GT:CLASSES/Spring 2015/CS 2340/git/TrueProjectUnicorn/ShoppingWithFriends/app/src/main/java/com/projectunicorn/shoppingwithfriends/RegistrationScreen.java:39: error: cannot find symbol
        return super.onOptionsItemSelected(item);
               ^
  symbol:   variable super
  location: class RegistrationScreen
/Users/AMTAGRWL/Downloads/Dropbox/GT:CLASSES/Spring 2015/CS 2340/git/TrueProjectUnicorn/ShoppingWithFriends/app/src/main/java/com/projectunicorn/shoppingwithfriends/RegistrationScreen.java:42: error: cannot find symbol
        startActivity(new Intent(getApplicationContext(), WelcomeScreen.class));
                                 ^
  symbol:   method getApplicationContext()
  location: class RegistrationScreen
/Users/AMTAGRWL/Downloads/Dropbox/GT:CLASSES/Spring 2015/CS 2340/git/TrueProjectUnicorn/ShoppingWithFriends/app/src/main/java/com/projectunicorn/shoppingwithfriends/RegistrationScreen.java:42: error: cannot find symbol
        startActivity(new Intent(getApplicationContext(), WelcomeScreen.class));
        ^
  symbol:   method startActivity(Intent)
  location: class RegistrationScreen
/Users/AMTAGRWL/Downloads/Dropbox/GT:CLASSES/Spring 2015/CS 2340/git/TrueProjectUnicorn/ShoppingWithFriends/app/src/main/java/com/projectunicorn/shoppingwithfriends/WelcomeScreen.java:13: error: method does not override or implement a method from a supertype
    @Override
    ^
/Users/AMTAGRWL/Downloads/Dropbox/GT:CLASSES/Spring 2015/CS 2340/git/TrueProjectUnicorn/ShoppingWithFriends/app/src/main/java/com/projectunicorn/shoppingwithfriends/WelcomeScreen.java:15: error: cannot find symbol
        super.onCreate(savedInstanceState);
        ^
  symbol:   variable super
  location: class WelcomeScreen
/Users/AMTAGRWL/Downloads/Dropbox/GT:CLASSES/Spring 2015/CS 2340/git/TrueProjectUnicorn/ShoppingWithFriends/app/src/main/java/com/projectunicorn/shoppingwithfriends/WelcomeScreen.java:16: error: cannot find symbol
        setContentView(R.layout.activity_welcome_screen);
        ^
  symbol:   method setContentView(int)
  location: class WelcomeScreen
/Users/AMTAGRWL/Downloads/Dropbox/GT:CLASSES/Spring 2015/CS 2340/git/TrueProjectUnicorn/ShoppingWithFriends/app/src/main/java/com/projectunicorn/shoppingwithfriends/WelcomeScreen.java:20: error: method does not override or implement a method from a supertype
    @Override
    ^
/Users/AMTAGRWL/Downloads/Dropbox/GT:CLASSES/Spring 2015/CS 2340/git/TrueProjectUnicorn/ShoppingWithFriends/app/src/main/java/com/projectunicorn/shoppingwithfriends/WelcomeScreen.java:23: error: cannot find symbol
        getMenuInflater().inflate(R.menu.menu_welcome_screen, menu);
        ^
  symbol:   method getMenuInflater()
  location: class WelcomeScreen
/Users/AMTAGRWL/Downloads/Dropbox/GT:CLASSES/Spring 2015/CS 2340/git/TrueProjectUnicorn/ShoppingWithFriends/app/src/main/java/com/projectunicorn/shoppingwithfriends/WelcomeScreen.java:27: error: method does not override or implement a method from a supertype
    @Override
    ^
/Users/AMTAGRWL/Downloads/Dropbox/GT:CLASSES/Spring 2015/CS 2340/git/TrueProjectUnicorn/ShoppingWithFriends/app/src/main/java/com/projectunicorn/shoppingwithfriends/WelcomeScreen.java:39: error: cannot find symbol
        return super.onOptionsItemSelected(item);
               ^
  symbol:   variable super
  location: class WelcomeScreen
/Users/AMTAGRWL/Downloads/Dropbox/GT:CLASSES/Spring 2015/CS 2340/git/TrueProjectUnicorn/ShoppingWithFriends/app/src/main/java/com/projectunicorn/shoppingwithfriends/WelcomeScreen.java:43: error: cannot find symbol
        startActivity(new Intent(getApplicationContext(), ShoppingWithFriendsLogin.class));
                                 ^
  symbol:   method getApplicationContext()
  location: class WelcomeScreen
/Users/AMTAGRWL/Downloads/Dropbox/GT:CLASSES/Spring 2015/CS 2340/git/TrueProjectUnicorn/ShoppingWithFriends/app/src/main/java/com/projectunicorn/shoppingwithfriends/WelcomeScreen.java:43: error: cannot find symbol
        startActivity(new Intent(getApplicationContext(), ShoppingWithFriendsLogin.class));
        ^
  symbol:   method startActivity(Intent)
  location: class WelcomeScreen
/Users/AMTAGRWL/Downloads/Dropbox/GT:CLASSES/Spring 2015/CS 2340/git/TrueProjectUnicorn/ShoppingWithFriends/app/src/main/java/com/projectunicorn/shoppingwithfriends/WelcomeScreen.java:47: error: cannot find symbol
        startActivity(new Intent(getApplicationContext(), RegistrationScreen.class));
                                 ^
  symbol:   method getApplicationContext()
  location: class WelcomeScreen
/Users/AMTAGRWL/Downloads/Dropbox/GT:CLASSES/Spring 2015/CS 2340/git/TrueProjectUnicorn/ShoppingWithFriends/app/src/main/java/com/projectunicorn/shoppingwithfriends/WelcomeScreen.java:47: error: cannot find symbol
        startActivity(new Intent(getApplicationContext(), RegistrationScreen.class));
        ^
  symbol:   method startActivity(Intent)
  location: class WelcomeScreen
/Users/AMTAGRWL/Downloads/Dropbox/GT:CLASSES/Spring 2015/CS 2340/git/TrueProjectUnicorn/ShoppingWithFriends/app/src/main/java/com/projectunicorn/shoppingwithfriends/WelcomeScreen.java:50: error: method does not override or implement a method from a supertype
    @Override
    ^
36 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.

BUILD FAILED

Total time: 2.692 secs

I have tried multiple existing posts regarding this but have failed to find a solution that works. 我已经尝试过有关此问题的多个现有帖子，但是未能找到有效的解决方案。

EDIT: My build.gradle file. 编辑：我的build.gradle文件。 

apply plugin: 'com.android.application'

android {
    compileSdkVersion 21
    buildToolsVersion "21.1.2"

    defaultConfig {
        applicationId "com.projectunicorn.shoppingwithfriends"
        minSdkVersion 15
        targetSdkVersion 21
        versionCode 1
        versionName "1.0"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'),                        'proguard-rules.pro'
        }
    }
}

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    compile 'com.google.android.gms:play-services:6.5.87'
    compile ('com.android.support:appcompat-v7:21.0.3')
    compile ('com.android.support:support-v4:21.0.+')
}

I'm using Android Studio 1.0.2 on OS X Yosemite. 我在OS X Yosemite上使用Android Studio 1.0.2。

2 个解决方案

解决方案1
 0  2015-02-10 23:52:33

Installing the library is not enough. 安装库是不够的。 You also need to add it to the list of dependencies of your project. 您还需要将其添加到项目的依赖项列表中。

To do that, add this line to the dependencies section of your build.gradle: 为此，请将此行添加到build.gradle的dependencies部分： 

dependencies {
  ...
  compile ('com.android.support:appcompat-v7:21.0.3')
  compile ('com.android.support:support-v4:21.0.3')
}

This was taken from the official docs : 这取自官方文件 ：

v7 appcompat library v7 appcompat库

Note: This library depends on the v4 Support Library. 注意：此库取决于v4支持库。 If you are using Ant or Eclipse, make sure you include the v4 Support Library as part of this library's classpath. 如果您使用的是Ant或Eclipse，请确保将v4支持库包含在此库的类路径中。

So don't forgot to add both v4 and v7. 因此，不要忘记同时添加v4和v7。

解决方案2
 0  2015-02-11 00:08:25

What versions do you choose when create project? 创建项目时您选择什么版本？ (target, minimum, etc) （目标，最低等）

I change all to one version - API 21, it works for me. 我将所有版本更改为一个版本-API 21，它对我有用。

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