Question

我是ActionBarActivity的新手，我的应用程序在eclipse中运行以下代码时崩溃了公共类登录扩展ActionBarActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_login);
    if (savedInstanceState == null) {
        getSupportFragmentManager().beginTransaction()
        .add(R.id.container, new PlaceholderFragment()).commit();
    }

}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.login, 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();
    if (id == R.id.action_settings) {
        return true;
    }
    return super.onOptionsItemSelected(item);
}

/**
 * A placeholder fragment containing a simple view.
 */
public static class PlaceholderFragment extends Fragment{

    public PlaceholderFragment() {
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        View rootView = inflater.inflate(R.layout.fragment_login,
                container, false);
        return rootView;
    }
}

}

我已导入的地方

import android.support.v4.app.Fragment;

import android.support.v7.app.ActionBarActivity;

但我仍然在LogCat中遇到如下错误：

01-27 16:47:13.091: E/AndroidRuntime(320): FATAL EXCEPTION: main
01-27 16:47:13.091: E/AndroidRuntime(320): Process: com.element45.android.localsale.activities, PID: 320
01-27 16:47:13.091: E/AndroidRuntime(320): java.lang.NoClassDefFoundError: Failed resolution of: Landroid/support/v7/appcompat/R$styleable;
01-27 16:47:13.091: E/AndroidRuntime(320):  at android.support.v7.app.ActionBarActivityDelegate.onCreate(ActionBarActivityDelegate.java:107)
01-27 16:47:13.091: E/AndroidRuntime(320):  at android.support.v7.app.ActionBarActivityDelegateICS.onCreate(ActionBarActivityDelegateICS.java:58)
01-27 16:47:13.091: E/AndroidRuntime(320):  at android.support.v7.app.ActionBarActivity.onCreate(ActionBarActivity.java:98)
01-27 16:47:13.091: E/AndroidRuntime(320):  at com.element45.android.localsale.activities.Login.onCreate(Login.java:18)
01-27 16:47:13.091: E/AndroidRuntime(320):  at android.app.Activity.performCreate(Activity.java:6289)
01-27 16:47:13.091: E/AndroidRuntime(320):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1119)
01-27 16:47:13.091: E/AndroidRuntime(320):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2646)
01-27 16:47:13.091: E/AndroidRuntime(320):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2758)
01-27 16:47:13.091: E/AndroidRuntime(320):  at android.app.ActivityThread.access$900(ActivityThread.java:177)
01-27 16:47:13.091: E/AndroidRuntime(320):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1448)
01-27 16:47:13.091: E/AndroidRuntime(320):  at android.os.Handler.dispatchMessage(Handler.java:102)
01-27 16:47:13.091: E/AndroidRuntime(320):  at android.os.Looper.loop(Looper.java:145)
01-27 16:47:13.091: E/AndroidRuntime(320):  at android.app.ActivityThread.main(ActivityThread.java:5942)
01-27 16:47:13.091: E/AndroidRuntime(320):  at java.lang.reflect.Method.invoke(Native Method)
01-27 16:47:13.091: E/AndroidRuntime(320):  at java.lang.reflect.Method.invoke(Method.java:372)
01-27 16:47:13.091: E/AndroidRuntime(320):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1388)
01-27 16:47:13.091: E/AndroidRuntime(320):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1183)
01-27 16:47:13.091: E/AndroidRuntime(320): Caused by: java.lang.ClassNotFoundException: Didn't find class "android.support.v7.appcompat.R$styleable" on path: DexPathList[[zip file "/data/app/com.element45.android.localsale.activities-1/base.apk"],nativeLibraryDirectories=[/vendor/lib, /system/lib]]
01-27 16:47:13.091: E/AndroidRuntime(320):  at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)
01-27 16:47:13.091: E/AndroidRuntime(320):  at java.lang.ClassLoader.loadClass(ClassLoader.java:511)
01-27 16:47:13.091: E/AndroidRuntime(320):  at java.lang.ClassLoader.loadClass(ClassLoader.java:469)
01-27 16:47:13.091: E/AndroidRuntime(320):  ... 17 more
01-27 16:47:13.091: E/AndroidRuntime(320):  Suppressed: java.lang.ClassNotFoundException: android.support.v7.appcompat.R$styleable
01-27 16:47:13.091: E/AndroidRuntime(320):      at java.lang.Class.classForName(Native Method)
01-27 16:47:13.091: E/AndroidRuntime(320):      at java.lang.BootClassLoader.findClass(ClassLoader.java:781)
01-27 16:47:13.091: E/AndroidRuntime(320):      at java.lang.BootClassLoader.loadClass(ClassLoader.java:841)
01-27 16:47:13.091: E/AndroidRuntime(320):      at java.lang.ClassLoader.loadClass(ClassLoader.java:504)
01-27 16:47:13.091: E/AndroidRuntime(320):      ... 18 more
01-27 16:47:13.091: E/AndroidRuntime(320):  Caused by: java.lang.NoClassDefFoundError: Class not found using the boot class loader; no stack available

谢谢

Answer 1

您应该使用 #Android Studio而不是Eclipse 。

01-27 16：47：13.091：E / AndroidRuntime（320）：引起： java.lang.ClassNotFoundException：没找到类路径上的“android.support.v7.appcompat.R $ styleable”：DexPathList [[zip 文件 “/data/app/com.element45.android.localsale.activities-1/base.apk"],nativeLibraryDirectories=[/vendor/lib， / system / lib]] 01-27 16：47：13.091：E / AndroidRuntime（320）：at dalvik.system.BaseDexClassLoader.findClass（BaseDexClassLoader.java:56） 01-27 16：47：13.091：E / AndroidRuntime（320）：at java.lang.ClassLoader.loadClass（ClassLoader.java:511)01-27 16：47：13.091：E / AndroidRuntime（320）：at java.lang.ClassLoader.loadClass（ClassLoader.java:469)01-27 16：47：13.091：E / AndroidRuntime（320）：... 17更多01-27 16：47：13.091： E / AndroidRuntime（320）：抑制：java.lang.ClassNotFoundException： android.support.v7.appcompat.R $设置样式

当Java虚拟机（JVM）或ClassLoader类的实例尝试加载类的定义但无法找到定义时，将引发

NoClassDefFoundError 错误。

错误方法： 使用不推荐使用的代码（ActionBarActivity）。

首先扩展 AppCompatActivity而不是ActionBarActivity 。

public class Login extends AppCompatActivity {
  // ...
}

<强>建议

设置android:minSdkVersion版本。

<uses-sdk android:minSdkVersion="15" />

尝试这种方式，希望它能够成功。

Answer 2

在Android SDK Manager中安装Android支持包 Android SDK Manager
将AppCompatActivity包添加到您的gradle配置

编译'com.android.support:appcompat-v7:23.1.0'
检查min SDK版本

java.lang.NoClassDefFoundError：解析失败：Landroid / support / v7 / appcompat / R $ styleable

2 个答案: