在buildPath中是否设置了库的顺序？
在buildPath中是否设置了库的顺序？
提问于 2014-11-10 12:06:49
我是MQTT和paho Libs for Android的新手。今天，我尝试创建一个简单的连接示例，如下所示，但结果是，尽管代码中没有错误，但在运行时，我还是从下面发布的logcat获得错误消息，eclipse表示can not run the projects due to errors "which are not exist"或App，我得到了下面发布的错误日志。
另外，我在下面发布了我在我的项目中的库的图片，这是从paho website下载的。
请让我知道我错过了什么，我做错了什么。
码
public class MQTT_00 extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.mqtt_00_layout);
MqttClientPersistence persistence = null;
try {
persistence = new MqttDefaultFilePersistence("/temp/");
} catch (MqttPersistenceException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
try {
MqttClient client = new MqttClient("tcp://localhost:1883", "MQTTSub", persistence);
MqttConnectOptions opts = new MqttConnectOptions();
opts.setKeepAliveInterval(480);
opts.setWill(client.getTopic("willTopic"), "something bad happened".getBytes(), 1, true);
client.connect(opts);
} catch (MqttException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}}
LogCat
11-10 12:52:49.617: E/AndroidRuntime(30700): FATAL EXCEPTION: main
11-10 12:52:49.617: E/AndroidRuntime(30700): Process: com.example.mqtt_00, PID: 30700
11-10 12:52:49.617: E/AndroidRuntime(30700): java.lang.NoClassDefFoundError:
org.eclipse.paho.client.mqttv3.MqttDefaultFilePersistence
11-1 12:52:49.617: E/AndroidRuntime(30700): at
com.example.mqtt_00.MQTT_00.onCreate(MQTT_00.java:21)
11-10 12:52:49.617: E/AndroidRuntime(30700): at
android.app.Activity.performCreate(Activity.java:5389)
11-10 12:52:49.617: E/AndroidRuntime(30700): at
android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1105)
11-10 12:52:49.617: E/AndroidRuntime(30700): at
android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2246)
11-10 12:52:49.617: E/AndroidRuntime(30700): at
android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2340)
11-10 12:52:49.617: E/AndroidRuntime(30700): at
android.app.ActivityThread.access$800(ActivityThread.java:157)
11-10 12:52:49.617: E/AndroidRuntime(30700): at
android.app.ActivityThread$H.handleMessage(ActivityThread.java:1247)
11-10 12:52:49.617: E/AndroidRuntime(30700): at
android.os.Handler.dispatchMessage(Handler.java:102)
11-10 12:52:49.617: E/AndroidRuntime(30700): at android.os.Looper.loop(Looper.java:157)
11-10 12:52:49.617: E/AndroidRuntime(30700): at
android.app.ActivityThread.main(ActivityThread.java:5293)
11-10 12:52:49.617: E/AndroidRuntime(30700): at java.lang.reflect.Method.invokeNative(Native
Method)
11-10 12:52:49.617: E/AndroidRuntime(30700): at
java.lang.reflect.Method.invoke(Method.java:515)
11-10 12:52:49.617: E/AndroidRuntime(30700): at
com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1265)
11-10 12:52:49.617: E/AndroidRuntime(30700): at c
com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1081)
11-10 12:52:49.617: E/AndroidRuntime(30700): at dalvik.system.NativeStart.main(Native Method)Pic
回答 1
Stack Overflow用户
发布于 2014-12-09 15:01:02
通过在Java build path->库中添加外部Jar，然后按顺序检查库和导出选项卡，确保正确添加了库。完成后，清理项目并尝试再次运行。这应该能解决问题！
它在我的末端起作用了。
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/26843469
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