因此,在开发公司的实际应用程序项目之前,我正在开发一个俗气的应用程序以发布帖子以在android中训练自己。我遇到了一个错误,尽管这给了我一个非常困难的时期。
我得到了要使用的库依赖项列表,并设置了build.gradle文件以将其加载到其中。它可以很好地同步,所以我认为据我所知正确完成了:
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
compile 'com.android.support:appcompat-v7:22.1.1'
compile 'com.google.android.gms:play-services:7.3.0'
compile 'com.squareup.okhttp:okhttp:2.3.0'
compile 'com.squareup.retrofit:retrofit:1.7.0'
compile 'com.google.code.gson:gson:2.3'
compile 'com.squareup.dagger:dagger:1.2.2'
compile 'com.squareup.dagger:dagger-compiler:1.2.2'
compile 'com.squareup.picasso:picasso:2.5.2'
compile 'com.android.support:recyclerview-v7:22.1.1'
compile 'com.squareup:otto:1.3.7'
compile 'com.path:android-priority-jobqueue:1.1.2'
compile 'io.realm:realm-android:0.80.1'
compile 'com.jakewharton:butterknife:6.1.0'
compile 'com.android.support:multidex:1.0.0'
compile 'com.android.support:appcompat-v7:22.1.1'
}
而且我实际上已经安装了android支持库和存储库:
但是我仍然尝试启动该应用程序,并获得以下堆栈跟踪:
java.lang.NoClassDefFoundError: android.support.v7.appcompat.R$attr
at android.support.v7.app.AppCompatDelegateImplV7.ensureSubDecor(AppCompatDelegateImplV7.java:286)
at android.support.v7.app.AppCompatDelegateImplV7.setContentView(AppCompatDelegateImplV7.java:246)
at android.support.v7.app.AppCompatActivity.setContentView(AppCompatActivity.java:106)
at com.anglersatalas.twitstagram.MainActivity.onCreate(MainActivity.java:23)
at android.app.Activity.performCreate(Activity.java:5451)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1093)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2298)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2392)
at android.app.ActivityThread.access$900(ActivityThread.java:169)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1280)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:146)
at android.app.ActivityThread.main(ActivityThread.java:5487)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1283)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1099)
at dalvik.system.NativeStart.main(Native Method)
我所见过的Stack Overflow上的其他任何地方都有解决方案,就是按照他们所说的那样在android网站上添加appcompat v7库,我已经在上面演示了这一点。我一生都无法弄清为什么这种情况仍在发生。查看堆栈跟踪,它在setContentView()方法中破坏了我的MainActivity:
package com.anglersatalas.twitstagram;
import android.os.Bundle;
import com.anglersatalas.twitstagram.R;
import android.support.v7.app.AppCompatActivity;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.TextView;
import com.anglersatalas.twitstagram.api.PostService;
import com.anglersatalas.twitstagram.models.Post;
import java.util.List;
import retrofit.RestAdapter;
public class MainActivity extends AppCompatActivity{
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(com.anglersatalas.twitstagram.R.layout.activity_main);
TextView tv = (TextView)findViewById(com.anglersatalas.twitstagram.R.id.textView);
RestAdapter adapter = new RestAdapter.Builder()
.setEndpoint("10.0.0.248/testserver/backend/web")
.build();
PostService service = adapter.create(PostService.class);
List<Post> list = service.getPosts();
String str = "";
for(Post p : list){
str += String.format("%s\n", p);
}
tv.setText(str);
}
...
}
单击进入正在调用引发异常的方法的类文件,这表明它找不到'android.support.v7.appcompat.R;':
我和我的同事不知所措。关于如何解决这个问题有什么建议吗?
我只花了几个小时就解决了这个问题,并且能够解决它。
It turns out I was over the dex limit, I did have multiDexEnabled true in my build.gradle file under defaultConfig, but it looks like I was missing a few other things for pre 5.0 devices..
defaultConfig {
...
multiDexEnabled true
... }
I first checked my method count with this: https://github.com/mihaip/dex-method-counts
I was at 67952 methods...
I then updated my build.gradle to add multidex support
dependencies {
...
compile 'com.android.support:multidex:1.0.0'
... }
I then updated my Application (we already have our own) to extend from MultiDexApplication
package com.me.myapp
...
public class Application extends MultiDexApplication {}
Here were the two links from the documentation I used to correctly implement multidex: https://developer.android.com/tools/building/multidex.html https://developer.android.com/reference/android/support/multidex/MultiDexApplication.html
Make sure your application in the manifest points to your custom multidex application
<application
...
android:name="com.me.myapp.Application" />
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