我已经使用minSDK 14实现了一个非常棒的应用程序。现在我试图“降级”到minSDK 10只是为了看看会发生什么。
我修复了GridLayout和Switch之类的内容，但我遇到的问题是ActionBar不再显示任何内容。
我已将我的MainActivity从FragmentActivity更改为ActionBarActivity。然后我将getActionBar()更改为getSupportActionBar()。之后，我将清单文件中的主题样式更改为几个内容，以查看是否发生了某些事情。现在我被卡住了，有什么遗漏吗？
public class MainActivity extends ActionBarActivity {
/** Called when the activity is first created. */
// private BluetoothAdapter mBluetoothAdapter = null;
public static String sAddress = "00:00:00:00:00:00"; // BoxAdresse
public AlertDialog.Builder b;
public BluetoothConnection bc = new BluetoothConnection();
// Debugging
private static final String TAG = "Main_Activity";
private static final boolean D = true;
// Message types sent from the BluetoothChatService Handler
public static final int MESSAGE_STATE_CHANGE = 1;
public static final int MESSAGE_READ = 2;
public static final int MESSAGE_WRITE = 3;
public static final int MESSAGE_DEVICE_NAME = 4;
public static final int MESSAGE_TOAST = 5;
public static final String TOAST = "toast";
// Key names received from the BluetoothChatService Handler
public static final String DEVICE_NAME = "device_name";
// Intent request codes
public static final int REQUEST_CONNECT_DEVICE_SECURE = 1;
private static final int REQUEST_ENABLE_BT = 3;
private static int CONNECT_COUNTER = 0;
private static final int MAX_CONNECT_ATTEMPT = 4;
private static final String TAG_ADMIN = "user_admin";
private static final String TAG_STANDARD = "user_standard";
private static String adminPermission;
// Name of the connected device
public static String mConnectedDeviceName = null;
// Local Bluetooth adapter
private static BluetoothAdapter mBluetoothAdapter = null;
// Member object for the chat services
public static BluetoothService mSerialService = null;
private static String mInStringBuffer;
public static Handler handler = new Handler(); // for postDelayed
private ActionBar actionBar;
public static Menu mMenu;
private Byte_Translation bWork;
public static FragmentActivity thisFragmentActivity = null;
private FragmentTabHost mTabHost;
private View tabIndicator1, tabIndicator2, tabIndicator3, tabIndicator4;
private TextView title;
private CharSequence mTitle;
String[] mFragments = {
"de.teamgrimm.android.crohmapp.tabs.InformationTabs",
"de.teamgrimm.android.crohmapp.tabs.DevelopmentTab",
"de.teamgrimm.android.crohmapp.tabs.ChargingTab" };
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.bottom_tabs);
actionBar = getSupportActionBar();
mTitle = getTitle();
// set the Icon
actionBar.setIcon(R.drawable.ic_launcher);
mTabHost = (FragmentTabHost) findViewById(android.R.id.tabhost);
mTabHost.setup(this, getSupportFragmentManager(), R.id.realtabcontent);
tabIndicator1 = LayoutInflater.from(this).inflate(
R.layout.crohmapptheme_tab_indicator_holo,
mTabHost.getTabWidget(), false);
title = (TextView) tabIndicator1.findViewById(android.R.id.title);
title.setText("Home");
tabIndicator2 = LayoutInflater.from(this).inflate(
R.layout.crohmapptheme_tab_indicator_holo,
mTabHost.getTabWidget(), false);
title = (TextView) tabIndicator2.findViewById(android.R.id.title);
title.setText("Infos");
tabIndicator3 = LayoutInflater.from(this).inflate(
R.layout.crohmapptheme_tab_indicator_holo,
mTabHost.getTabWidget(), false);
title = (TextView) tabIndicator3.findViewById(android.R.id.title);
title.setText("Charging");
tabIndicator4 = LayoutInflater.from(this).inflate(
R.layout.crohmapptheme_tab_indicator_holo,
mTabHost.getTabWidget(), false);
title = (TextView) tabIndicator4.findViewById(android.R.id.title);
title.setText("Development");
mTabHost.addTab(
mTabHost.newTabSpec("home").setIndicator(tabIndicator1),
HomeFragment.class, null);
mTabHost.addTab(mTabHost.newTabSpec("infos")
.setIndicator(tabIndicator2), InformationTabs.class, null);
mTabHost.addTab(
mTabHost.newTabSpec("charging").setIndicator(tabIndicator3),
ChargingTabs.class, null);
mTabHost.addTab(
mTabHost.newTabSpec("development").setIndicator(tabIndicator4),
DevelopmentTabs.class, null);
thisFragmentActivity = this;
bWork = new Byte_Translation(this, mHandler);
InOutFragment.mOutgoingArrayAdapter = new ArrayAdapter<String>(this,
R.layout.message);
InOutFragment.mIncomingArrayAdapter = new ArrayAdapter<String>(this,
R.layout.message);
ManualDebugFragment.mReceivedHexArrayAdapter = new ArrayAdapter<String>(
this, R.layout.message);
ManualDebugFragment.mSentHexArrayAdapter = new ArrayAdapter<String>(
this, R.layout.message);
DebugFragment.debugArrayAdapter = new ArrayAdapter<String>(this,
R.layout.message);
// // Get local Bluetooth adapter
// mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
//
// // If the adapter is null, then Bluetooth is not supported
// if (mBluetoothAdapter == null) {
//
// Toast.makeText(this, "Bluetooth is not available",
// Toast.LENGTH_LONG).show();
// finish();
// return;
// }
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// // Take appropriate action for each action item click
// if (menuItem.get_mItem(item.getItemId()) != null) {
// switch (menuItem.get_mItem(item.getItemId())) {
// Take appropriate action for each action item click
if (item != null) {
switch (item.getItemId()) {
case (R.id.connect_box):
if (!Byte_Translation.isConnected()) {
devicedialog();
} else {
if (mSerialService != null)
mSerialService.stop();
}
return true;
case (R.id.disconnect_box):
if (Byte_Translation.isConnected()) {
// Stop BT Service to disconnect
if (mSerialService != null)
mSerialService.stop();
sAddress = "00:00:00:00:00:00";
}
return true;
case (R.id.login_box):
Byte_Translation.LOGIN_SUCCESSFULL = false;
Byte_Translation.LOGINCOUNT = 0;
Byte_Translation.login();
return true;
case (R.id.refresh_menu):
Byte_Translation.refresh_all();
Byte_Translation.refresh_timer();
return true;
case (R.id.auto_refresh):
if (!Byte_Translation.AUTOREFRESH) {
Byte_Translation.AUTOREFRESH = true;
item.setChecked(true);
Byte_Translation.refresh();
} else {
Byte_Translation.AUTOREFRESH = false;
item.setChecked(false);
}
save_shared_Prefs();
return true;
case (android.R.id.home):
AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(
MainActivity.this);
alertDialogBuilder.setTitle("Exit " + this.getTitle());
alertDialogBuilder.setMessage("Are you sure?");
// set positive button: Yes message
alertDialogBuilder.setPositiveButton("Yes",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
onBackPressed();
}
});
// set negative button: No message
alertDialogBuilder.setNegativeButton("No",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
dialog.cancel();
}
});
AlertDialog alertDialog = alertDialogBuilder.create();
// show alert
alertDialog.show();
return true;
default:
return super.onOptionsItemSelected(item);
}
}
return false;
}
答案 0 :(得分：1)
在您的片段中，您需要通知setHasOptionsMenu有行动项目。否则，可能无法调用onCreateOptionsMenu。我使用ABC（以前的ActionBarSherlock）和类似的FragmentTabPager概念，我需要在片段中使用它：
@Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
setHasOptionsMenu(true);
}