我无法在我的操作栏中添加一个微调器来代替应用程序名称。我确定这个问题之前已经被问过，但是所有的答案几乎都是一样的，要么是简单的一行更正，要么是在谷歌开发网站上引用他们的一个可爱的例子：http: //developer.android.com/guide /topics/ui/actionbar.html#Dropdown android 文档，但对于初学者来说，我发现它太多了，并且遗漏了一些关键信息。
public class MainProgram extends Activity implements OnNavigationListener {
/**
* Mobile Service Client reference
*/
private MobileServiceClient mClient;
private ConnectWithService service;
/**
* Progress spinner to use for table operations
*/
private ProgressBar mProgressBar;
/**
* Sensor stuff
*/
SensorManager mSensor;
Detection orientation;
//Spinner Listener
mOnNavigationListener = new OnNavigationListener() {
// Get the same strings provided for the drop-down's ArrayAdapter
String[] strings = getResources().getStringArray(R.array.action_list);
@Override
public boolean onNavigationItemSelected(int position, long itemId) {
//toast
Toast toast = Toast.makeText(this, "whoop whoop!", toast.LENGTH_SHORT);
toast.show();
}
};
/**
* Initializes the activity
*/
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main_program);
//Load progress bar view
mProgressBar = (ProgressBar) findViewById(R.id.loadingProgressBar);
// Initialize the progress bar
mProgressBar.setVisibility(ProgressBar.GONE);
//Spinner Adapter
setNavigationMode(NAVIGATION_MODE_LIST);
SpinnerAdapter mSpinnerAdapter = ArrayAdapter.createFromResource(this, R.array.action_list,
android.R.layout.simple_spinner_dropdown_item);
//innitialize Sensor Manager
mSensor = (SensorManager)getSystemService(SENSOR_SERVICE);
//signin
try {
// Create the Mobile Service Client instance, using the provided
// Mobile Service URL and key
mClient = new MobileServiceClient(
"secret",
"secret",
this).withFilter(new ProgressFilter());
} catch (MalformedURLException e) {
createAndShowDialog(new Exception("There was an error creating the Mobile Service. Verify the URL"), "Error");
}
authenticate();
}
/**
* Initializes the activity menu
*/
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}
/**
* Select an option from the menu
*/
@Override
public boolean onOptionsItemSelected(MenuItem item) {
if (item.getItemId() == R.id.menu_refresh) {
}
return true;
}
/**
* Creates a dialog and shows it
*
* @param exception
* The exception to show in the dialog
* @param title
* The dialog title
*/
private void createAndShowDialog(Exception exception, String title) {
createAndShowDialog(exception.toString(), title);
}
/**
* Creates a dialog and shows it
*
* @param message
* The dialog message
* @param title
* The dialog title
*/
private void createAndShowDialog(String message, String title) {
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setMessage(message);
builder.setTitle(title);
builder.create().show();
}
private class ProgressFilter implements ServiceFilter {
@Override
public void handleRequest(ServiceFilterRequest request, NextServiceFilterCallback nextServiceFilterCallback,
final ServiceFilterResponseCallback responseCallback) {
runOnUiThread(new Runnable() {
@Override
public void run() {
if (mProgressBar != null) mProgressBar.setVisibility(ProgressBar.VISIBLE);
}
});
nextServiceFilterCallback.onNext(request, new ServiceFilterResponseCallback() {
@Override
public void onResponse(ServiceFilterResponse response, Exception exception) {
runOnUiThread(new Runnable() {
@Override
public void run() {
if (mProgressBar != null) mProgressBar.setVisibility(ProgressBar.GONE);
}
});
if (responseCallback != null) responseCallback.onResponse(response, exception);
}
});
}
}
private void authenticate() {
// Login using the Google provider.
mClient.login(MobileServiceAuthenticationProvider.MicrosoftAccount,
new UserAuthenticationCallback() {
@Override
public void onCompleted(MobileServiceUser user,
Exception exception, ServiceFilterResponse response) {
if (exception == null) {
createAndShowDialog(String.format(
"You are now logged in - %1$2s",
user.getUserId()), "Success");
service = new ConnectWithService(mClient,user.getUserId());
orientation = new Detection(mSensor);
} else {
createAndShowDialog("You must log in. Login Required", "Error");
}
}
});
}
//start sensors camera etc if needed
protected void onResume() {
super.onResume();
if(orientation!=null)
orientation.startSensorsListening();
}
// stop sensors etc
protected void onPause() {
super.onPause();
orientation.stopSensorListening();
}
}
至少有两个错误我认为 mOnNavigationListener 应该在其他地方 setnavigationMode() 有错误