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我正在尝试学习 Sphero Android SDK 并遵循官方教程。首先我成功地将 RobotLibrary.jar 添加到我的项目中，没有编译错误。接下来，我将 SpheroConnectionView 放到我的布局文件中，如下所示：

<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:background="#ff888888" >

    <orbotix.view.connection.SpheroConnectionView
        android:id="@+id/sphero_connection_view"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:background="#FFF" />

</LinearLayout>

然后我将以下代码添加到 MainActivity.java

public class MainActivity extends Activity {

    private SpheroConnectionView mSpheroConn;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mSpheroConn=(SpheroConnectionView)findViewById(R.id.sphero_connection_view);

    }

}

我希望看到通常的 Sphero 连接视图（这是相当简单的代码），但它会引发如下异常：

02-25 15:15:53.161：E/AndroidRuntime(1241)：java.lang.RuntimeException：无法启动活动 ComponentInfo{com.ecem.spheroblank/com.ecem.spheroblank.MainActivity}：android.view.InflateException：二进制XML 文件第 7 行：膨胀类 orbotix.view.connection.SpheroConnectionView 时出错

这是完整的堆栈跟踪：

02-25 15:15:53.161: E/AndroidRuntime(1241): FATAL EXCEPTION: main
02-25 15:15:53.161: E/AndroidRuntime(1241): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.ecem.spheroblank/com.ecem.spheroblank.MainActivity}: android.view.InflateException: Binary XML file line #7: Error inflating class orbotix.view.connection.SpheroConnectionView
02-25 15:15:53.161: E/AndroidRuntime(1241):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2059)
02-25 15:15:53.161: E/AndroidRuntime(1241):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084)
02-25 15:15:53.161: E/AndroidRuntime(1241):     at android.app.ActivityThread.access$600(ActivityThread.java:130)
02-25 15:15:53.161: E/AndroidRuntime(1241):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195)
02-25 15:15:53.161: E/AndroidRuntime(1241):     at android.os.Handler.dispatchMessage(Handler.java:99)
02-25 15:15:53.161: E/AndroidRuntime(1241):     at android.os.Looper.loop(Looper.java:137)
02-25 15:15:53.161: E/AndroidRuntime(1241):     at android.app.ActivityThread.main(ActivityThread.java:4745)
02-25 15:15:53.161: E/AndroidRuntime(1241):     at java.lang.reflect.Method.invokeNative(Native Method)
02-25 15:15:53.161: E/AndroidRuntime(1241):     at java.lang.reflect.Method.invoke(Method.java:511)
02-25 15:15:53.161: E/AndroidRuntime(1241):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
02-25 15:15:53.161: E/AndroidRuntime(1241):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
02-25 15:15:53.161: E/AndroidRuntime(1241):     at dalvik.system.NativeStart.main(Native Method)
02-25 15:15:53.161: E/AndroidRuntime(1241): Caused by: android.view.InflateException: Binary XML file line #7: Error inflating class orbotix.view.connection.SpheroConnectionView
02-25 15:15:53.161: E/AndroidRuntime(1241):     at android.view.LayoutInflater.createView(LayoutInflater.java:613)
02-25 15:15:53.161: E/AndroidRuntime(1241):     at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:687)
02-25 15:15:53.161: E/AndroidRuntime(1241):     at android.view.LayoutInflater.rInflate(LayoutInflater.java:746)
02-25 15:15:53.161: E/AndroidRuntime(1241):     at android.view.LayoutInflater.inflate(LayoutInflater.java:489)
02-25 15:15:53.161: E/AndroidRuntime(1241):     at android.view.LayoutInflater.inflate(LayoutInflater.java:396)
02-25 15:15:53.161: E/AndroidRuntime(1241):     at android.view.LayoutInflater.inflate(LayoutInflater.java:352)
02-25 15:15:53.161: E/AndroidRuntime(1241):     at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:256)
02-25 15:15:53.161: E/AndroidRuntime(1241):     at android.app.Activity.setContentView(Activity.java:1867)
02-25 15:15:53.161: E/AndroidRuntime(1241):     at com.ecem.spheroblank.MainActivity.onCreate(MainActivity.java:20)
02-25 15:15:53.161: E/AndroidRuntime(1241):     at android.app.Activity.performCreate(Activity.java:5008)
02-25 15:15:53.161: E/AndroidRuntime(1241):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1079)
02-25 15:15:53.161: E/AndroidRuntime(1241):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2023)
02-25 15:15:53.161: E/AndroidRuntime(1241):     ... 11 more
02-25 15:15:53.161: E/AndroidRuntime(1241): Caused by: java.lang.reflect.InvocationTargetException
02-25 15:15:53.161: E/AndroidRuntime(1241):     at java.lang.reflect.Constructor.constructNative(Native Method)
02-25 15:15:53.161: E/AndroidRuntime(1241):     at java.lang.reflect.Constructor.newInstance(Constructor.java:417)
02-25 15:15:53.161: E/AndroidRuntime(1241):     at android.view.LayoutInflater.createView(LayoutInflater.java:587)
02-25 15:15:53.161: E/AndroidRuntime(1241):     ... 22 more
02-25 15:15:53.161: E/AndroidRuntime(1241): Caused by: java.lang.ExceptionInInitializerError
02-25 15:15:53.161: E/AndroidRuntime(1241):     at orbotix.view.connection.SpheroConnectionView.startDiscovery(SpheroConnectionView.java:236)
02-25 15:15:53.161: E/AndroidRuntime(1241):     at orbotix.view.connection.SpheroConnectionView.<init>(SpheroConnectionView.java:215)
02-25 15:15:53.161: E/AndroidRuntime(1241):     ... 25 more
02-25 15:15:53.161: E/AndroidRuntime(1241): Caused by: java.lang.NullPointerException
02-25 15:15:53.161: E/AndroidRuntime(1241):     at orbotix.robot.base.RobotProvider.<init>(RobotProvider.java:161)
02-25 15:15:53.161: E/AndroidRuntime(1241):     at orbotix.robot.base.RobotProvider.<clinit>(RobotProvider.java:78)
02-25 15:15:53.161: E/AndroidRuntime(1241):     ... 27 more

那么我该如何解决呢？

4

1 回答 1

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最后，我找到了答案。我正在写下来，所以它可能对其他对 Sphero Android SDK 感兴趣的开发人员有所帮助。

右键单击项目>选择属性>>打开“Java编译器”部分。确保选中“启用项目特定设置”并将“编译器合规性级别”设置为 1.6！

于 2014-04-26T12:27:32.237 回答