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在我的应用程序中，我使用了来自 BluetoothChat 示例的 DeviceListActivity 类的略微修改版本。该代码在我测试的所有设备上运行良好，但是当我发布应用程序时，我开始收到如下报告：

java.lang.StringIndexOutOfBoundsException: String index out of range: -1
at java.lang.String.substring(String.java:1555)
at sword.games.highnoonf.activities.DeviceListActivity$1.onItemClick(DeviceListActivity.java:18    0)
at android.widget.AdapterView.performItemClick(AdapterView.java:284)
at android.widget.ListView.performItemClick(ListView.java:3388)
at android.widget.AbsListView$PerformClick.run(AbsListView.java:1738)
at android.os.Handler.handleCallback(Handler.java:587)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:143)
at android.app.ActivityThread.main(ActivityThread.java:5097)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:521)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
at dalvik.system.NativeStart.main(Native Method)

导致异常的函数是这样的：

private OnItemClickListener mDeviceClickListener = new OnItemClickListener() {
    public void onItemClick(AdapterView<?> av, View v, int arg2, long arg3)       {         
        // Cancel discovery because it's costly and we're about to connect
        mBtAdapter.cancelDiscovery();

        // Get the device MAC address, which is the last 17 chars in the View
        String info = ((TextView) v).getText().toString();
        String address = info.substring(info.length() - 17);
        String devName = info.substring(0, info.length() - 17);

        // Create the result Intent and include the MAC address
        Intent intent = new Intent();
        intent.putExtra(EXTRA_DEVICE_ADDRESS, address);
        intent.putExtra("DEVICE_NAME", devName);

        // Set result and finish this Activity
        setResult(Activity.RESULT_OK, intent);
        finish();
    }
};

其余代码几乎与 DeviceListActivity 示例相同...我希望有人可以解决此问题或给我解释为什么会发生这种情况...谢谢...

编辑：代码已经在检查名称是否存在并且 MAC 地址的长度与这些行是否正确（如果出现问题，则不会添加电话并且用户无法单击它）：

String name = device.getName();
String address = device.getAddress();

if(name == null) name = "Unknown";
else if (name.length() == 0) name = "Unknown";

if (address.length() == 17){
    mNewDevicesArrayAdapter.add(name + "\n" + address);
}
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1 回答 1

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好像你info.length()的尺寸小于17。确保子字符串方法没有将任何负值作为参数。将代码的关键部分放在try/catch块中以避免异常。

于 2012-04-11T19:58:46.503 回答