当我按下启动 MainActivity 中应该启动新活动的方法的按钮时，出现“预验证类中的 java.lang.IllegalAccessError 类引用解析为意外实现”错误。我可以做什么来解决这个问题？这是我第一次尝试制作 Android 应用程序，因此需要逐步说明:)
另外，我还无法测试它是否有效，但如果您发现我的 Augie Activity 服务实现或本地广播实现有任何问题，请随时告诉我。
Thanks!
仅供参考：MainActivity 启动 Navigation Activity，从而启动 Service AugiActivity
Augi 活动向 Navigation 发送本地广播消息
LogCat:
03-24 20:01:56.632: E/AndroidRuntime(11183): FATAL EXCEPTION: main
03-24 20:01:56.632: E/AndroidRuntime(11183): java.lang.IllegalStateException: Could not
execute method of the activity
03-24 20:01:56.632: E/AndroidRuntime(11183): at
android.view.View$1.onClick(View.java:2154)
03-24 20:01:56.632: E/AndroidRuntime(11183): at
android.view.View.performClick(View.java:2537)
03-24 20:01:56.632: E/AndroidRuntime(11183): at
android.view.View$PerformClick.run(View.java:9157)
03-24 20:01:56.632: E/AndroidRuntime(11183): at
android.os.Handler.handleCallback(Handler.java:587)
03-24 20:01:56.632: E/AndroidRuntime(11183): at
android.os.Handler.dispatchMessage(Handler.java:92)
03-24 20:01:56.632: E/AndroidRuntime(11183): at
android.os.Looper.loop(Looper.java:130)
03-24 20:01:56.632: E/AndroidRuntime(11183): at
android.app.ActivityThread.main(ActivityThread.java:3687)
03-24 20:01:56.632: E/AndroidRuntime(11183): at
java.lang.reflect.Method.invokeNative(Native Method)
03-24 20:01:56.632: E/AndroidRuntime(11183): at
java.lang.reflect.Method.invoke(Method.java:507)
03-24 20:01:56.632: E/AndroidRuntime(11183): at
com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:842)
03-24 20:01:56.632: E/AndroidRuntime(11183): at
com.android.internal.os.ZygoteInit.main(ZygoteInit.java:600)
03-24 20:01:56.632: E/AndroidRuntime(11183): at
dalvik.system.NativeStart.main(Native Method)
03-24 20:01:56.632: E/AndroidRuntime(11183): Caused by:
java.lang.reflect.InvocationTargetException
03-24 20:01:56.632: E/AndroidRuntime(11183): at
java.lang.reflect.Method.invokeNative(Native Method)
03-24 20:01:56.632: E/AndroidRuntime(11183): at
java.lang.reflect.Method.invoke(Method.java:507)
03-24 20:01:56.632: E/AndroidRuntime(11183): at
android.view.View$1.onClick(View.java:2149)
03-24 20:01:56.632: E/AndroidRuntime(11183): ... 11 more
03-24 20:01:56.632: E/AndroidRuntime(11183): Caused by: java.lang.NoClassDefFoundError:
com.example.augi_practice.Navigation
03-24 20:01:56.632: E/AndroidRuntime(11183): at
com.example.augi_practice.MainActivity.navigation(MainActivity.java:33)
03-24 20:01:56.632: E/AndroidRuntime(11183): ... 14 more
03-24 20:01:56.632: E/AndroidRuntime(11183): Caused by: java.lang.IllegalAccessError:
Class ref in pre-verified class resolved to unexpected implementation
03-24 20:01:56.632: E/AndroidRuntime(11183): at
dalvik.system.DexFile.defineClass(Native Method)
03-24 20:01:56.632: E/AndroidRuntime(11183): at
dalvik.system.DexFile.loadClassBinaryName(DexFile.java:207)
03-24 20:01:56.632: E/AndroidRuntime(11183): at
dalvik.system.PathClassLoader.findClass(PathClassLoader.java:200)
03-24 20:01:56.632: E/AndroidRuntime(11183): at
java.lang.ClassLoader.loadClass(ClassLoader.java:551)
03-24 20:01:56.632: E/AndroidRuntime(11183): at
java.lang.ClassLoader.loadClass(ClassLoader.java:511)
03-24 20:01:56.632: E/AndroidRuntime(11183): ... 15 more
XML 文件：
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.augi_practice"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="3"
android:targetSdkVersion="10" />
<uses-permission android:name="android.permission.CAMERA" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.BLUETOOTH" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.example.augi_practice.MainActivity"
android:label="@string/app_name"
android:screenOrientation="landscape" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
<intent-filter>
<action android:name="android.hardware.usb.action.USB_ACCESSORY_ATTACHED"
/>
</intent-filter>
</activity>
<activity
android:name="com.example.augi_practice.Navigation"
android:label="@string/title_activity_navigation"
android:screenOrientation="landscape" >
</activity>
<service
android:name="com.example.augi_practice.AugiActivity"
android:label="@string/title_activity_augi"
android:parentActivityName="com.example.augi_practice.Navigation"
android:screenOrientation="landscape" >
<meta-data
android:name="android.support.PARENT_ACTIVITY"
android:value="com.example.augi_practice.Navigation" />
</service>
<uses-library android:name="com.google.android.maps" />
</application>
</manifest>
主要活动：
package com.example.augi_practice;
import ioio.lib.util.android.IOIOActivity;
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.Menu;
import android.view.View;
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}
public void call_ioio(View v)
{
Intent intent = new Intent(this, AugiActivity.class);
startActivity(intent);
}
public void navigation(View v)
{
Intent intent = new Intent(this, Navigation.class);
startActivity(intent);
}
}
导航活动：
package com.example.augi_practice;
// Lots of imports here
public class Navigation extends MapActivity implements Runnable,
SurfaceHolder.Callback{
String LED = null;
String MAG = null;
String BAR = null;
String GYRO = null;
String EULER = null;
String GGA = null;
private BroadcastReceiver MessageReceiver = new BroadcastReceiver()
{
@Override
public void onReceive(Context context, Intent intent)
{
LED = intent.getStringExtra("LED");
MAG = intent.getStringExtra("MAG");
BAR = intent.getStringExtra("BAR");
GYRO = intent.getStringExtra("GYRO");
EULER = intent.getStringExtra("EULER");
GGA = intent.getStringExtra("GGA");
}
};
// More global variables
// Lots of gui variables here
// More global variables
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_navigation);
MapView mapview = (MapView) findViewById(R.id.mapview);
mapview.setBuiltInZoomControls(true);
getWindow().setFormat(PixelFormat.UNKNOWN);
// Camera configuration settings
LocalBroadcastManager.getInstance(this).registerReceiver(MessageReceiver,
new IntentFilter("IOIOData"));
getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
// Lots of links from acivity to gui
startService( new Intent(this, AugiActivity.class));
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.activity_navigation, menu);
return true;
}
@Override
protected boolean isRouteDisplayed() {
// TODO Auto-generated method stub
return false;
}
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width,
int height) {
// TODO Auto-generated method stub
}
@Override
public void surfaceCreated(SurfaceHolder holder) {
// TODO Auto-generated method stub
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
// TODO Auto-generated method stub
}
public void sensorLayer(View v)
{
// Executes some code
}
public void mapLayer(View v)
{
// Executes some code
}
public void cameraLayer(View v)
{
// Executes some code
}
@Override
public void run() {
//Executes some code
}
}
Augi活动的一部分：
package com.example.augi_practice;
//lots of imports here
public class AugiActivity extends Service {
public Activity activity_name;
class IOIO extends IOIOActivity {
// Lots of global variables
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
activity_name = this.getParent();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
return true;
}
class Looper extends BaseIOIOLooper {
/** The on-board LED. */
// Class variables
public Activity activity_name;
Looper(Activity x)
{
this.activity_name = x;
}
// More class variables
/**
* Called every time a connection with IOIO has been established.
* Typically used to open pins.
*
* @throws ConnectionLostException
* When IOIO connection is lost.
* @throws InterruptedException
*
* @see ioio.lib.util.AbstractIOIOActivity.IOIOThread#setup()
*/
@Override
protected void setup() throws ConnectionLostException,
InterruptedException
{
// establish various connections here
bar_calibration();
mag_setup();
imu_setup();
try {
gps_setup();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
// Various setup methods here
/**
* Called repetitively while the IOIO is connected.
*
* @throws ConnectionLostException
* When IOIO connection is lost.
* @throws InterruptedException
*
* @see ioio.lib.util.AbstractIOIOActivity.IOIOThread#loop()
*/
@Override
public void loop() throws ConnectionLostException,
InterruptedException
{
get_light();
get_temp();
get_pressure();
get_north();
get_imu();
try {
get_gps();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
led_.write(true);
sendMessage();
}
// Various methodes to get data
private void sendMessage()
{
Intent intent = new Intent("IOIOData");
intent.putExtra("LED", get_LED());
LocalBroadcastManager.getInstance(activity_name).sendBroadcast(intent);
intent.putExtra("MAG", get_MAG());
LocalBroadcastManager.getInstance(activity_name).sendBroadcast(intent);
intent.putExtra("BAR", get_BAR());
LocalBroadcastManager.getInstance(activity_name).sendBroadcast(intent);
intent.putExtra("GYRO", get_GYRO());
LocalBroadcastManager.getInstance(activity_name).sendBroadcast(intent);
intent.putExtra("EULER", get_EULER());
LocalBroadcastManager.getInstance(activity_name).sendBroadcast(intent);
intent.putExtra("GGA", gps_GGA);
LocalBroadcastManager.getInstance(activity_name).sendBroadcast(intent);
}
}
