我试图在我的一个 Activity 上显示一个 ActionBar，但我似乎无法弄清楚为什么它不显示。
有人可以帮忙吗？
Activity :
public class Login extends Activity {
public static final String TAG = "MainActivity";
public static final String DEFAULT_CHAT_NAME = "";
private WifiP2pManager mManager;
private Channel mChannel;
private WifiDirectBroadcastReceiver mReceiver;
private IntentFilter mIntentFilter;
private com.ajapps.app.floatingactionbutton.AddFloatingActionButton goToChat;
private ImageView goToSettings;
private TextView goToSettingsText;
private TextView setChatNameLabel;
private EditText setChatName;
private ImageView disconnect;
public static String chatName;
public static ServerInit server;
//Getters and Setters
public WifiP2pManager getmManager() { return mManager; }
public Channel getmChannel() { return mChannel; }
public WifiDirectBroadcastReceiver getmReceiver() { return mReceiver; }
public IntentFilter getmIntentFilter() { return mIntentFilter; }
public com.ajapps.app.floatingactionbutton.AddFloatingActionButton getGoToChat(){ return goToChat; }
public TextView getSetChatNameLabel() { return setChatNameLabel; }
public ImageView getGoToSettings() { return goToSettings; }
public EditText getSetChatName() { return setChatName; }
public TextView getGoToSettingsText() { return goToSettingsText; }
public ImageView getDisconnect() { return disconnect; }
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.login);
//Init the Channel, Intent filter and Broadcast receiver
init();
//Button Go to Settings
goToSettings = (ImageView) findViewById(R.id.goToSettings);
goToSettings();
//Go to Settings text
goToSettingsText = (TextView) findViewById(R.id.textGoToSettings);
//Button Go to Chat
goToChat = (com.ajapps.app.floatingactionbutton.AddFloatingActionButton) findViewById(R.id.goToChat);
goToChat();
//Set the chat name
setChatName = (EditText) findViewById(R.id.setChatName);
setChatNameLabel = (TextView) findViewById(R.id.setChatNameLabel);
setChatName.setText(loadChatName(this));
//Button Disconnect
disconnect = (ImageView) findViewById(R.id.disconnect);
disconnect();
}
@Override
protected void onPostCreate(Bundle savedInstanceState) {
super.onPostCreate(savedInstanceState);
}
@Override
public void onResume() {
super.onResume();
registerReceiver(mReceiver, mIntentFilter);
mManager.discoverPeers(mChannel, new WifiP2pManager.ActionListener() {
@Override
public void onSuccess() {
Log.v(TAG, "Discovery process succeeded");
}
@Override
public void onFailure(int reason) {
Log.v(TAG, "Discovery process failed");
}
});
}
@Override
public void onPause() {
super.onPause();
unregisterReceiver(mReceiver);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// int idItem = item.getItemId();
return super.onOptionsItemSelected(item);
}
public void init(){
mManager = (WifiP2pManager) getSystemService(Context.WIFI_P2P_SERVICE);
mChannel = mManager.initialize(this, getMainLooper(), null);
mReceiver = WifiDirectBroadcastReceiver.createInstance();
mReceiver.setmManager(mManager);
mReceiver.setmChannel(mChannel);
mReceiver.setmActivity(this);
mIntentFilter = new IntentFilter();
mIntentFilter.addAction(WifiP2pManager.WIFI_P2P_STATE_CHANGED_ACTION);
mIntentFilter.addAction(WifiP2pManager.WIFI_P2P_PEERS_CHANGED_ACTION);
mIntentFilter.addAction(WifiP2pManager.WIFI_P2P_CONNECTION_CHANGED_ACTION);
mIntentFilter.addAction(WifiP2pManager.WIFI_P2P_THIS_DEVICE_CHANGED_ACTION);
}
public void goToChat(){
goToChat.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
if(!setChatName.getText().toString().equals("")){
//Set the chat name
saveChatName(Login.this, setChatName.getText().toString());
chatName = loadChatName(Login.this);
//Start the init process
if(mReceiver.isGroupeOwner() == WifiDirectBroadcastReceiver.IS_OWNER){
Toast.makeText(Login.this, "I'm the group owner " + mReceiver.getOwnerAddr().getHostAddress(), Toast.LENGTH_SHORT).show();
server = new ServerInit();
server.start();
}
else if(mReceiver.isGroupeOwner() == WifiDirectBroadcastReceiver.IS_CLIENT){
Toast.makeText(Login.this, "I'm the client", Toast.LENGTH_SHORT).show();
ClientInit client = new ClientInit(mReceiver.getOwnerAddr());
client.start();
}
//Open the ChatActivity
Intent intent = new Intent(getApplicationContext(), ChatActivity.class);
startActivity(intent);
}
else{
Toast.makeText(Login.this, "Please enter a chat name", Toast.LENGTH_SHORT).show();
}
}
});
}
public void disconnect(){
disconnect.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
mManager.removeGroup(mChannel, null);
finish();
}
});
}
public void goToSettings(){
goToSettings.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
//Open Wifi settings
startActivityForResult(new Intent(android.provider.Settings.ACTION_WIFI_SETTINGS), 0);
}
});
}
//Save the chat name to SharedPreferences
public void saveChatName(Context context, String chatName) {
SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);
Editor edit = prefs.edit();
edit.putString("chatName", chatName);
edit.commit();
}
//Retrieve the chat name from SharedPreferences
public String loadChatName(Context context) {
SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);
return prefs.getString("chatName", DEFAULT_CHAT_NAME);
}
}
还有我的 xml:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:fab="http://schemas.android.com/apk/res-auto"
android:id="@+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.ajapps.wifichat.MainActivity">
<!-- Go to Settings screen -->
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical"
android:id="@+id/linearLayout"
android:layout_centerVertical="true"
android:layout_centerHorizontal="true">
<ImageView
android:id="@+id/goToSettings"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:contentDescription="@string/go_to_settings_button"
android:src="@drawable/wifi_icon"
android:layout_gravity="center" />
<TextView
android:id="@+id/textGoToSettings"
android:layout_width="200dp"
android:layout_height="wrap_content"
android:text="@string/go_to_settings_text"
android:textSize="16sp"
android:textColor="@color/red"
android:gravity="center"
android:layout_gravity="center_vertical"/>
</LinearLayout>
<!-- Go to Chat screen -->
<ImageView
android:id="@+id/disconnect"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_above="@+id/setChatNameLabel"
android:contentDescription="@string/disconnect"
android:src="@drawable/disconnect"
android:layout_marginBottom="15dp"
android:visibility="gone"
android:layout_centerHorizontal="true"/>
<TextView
android:id="@id/setChatNameLabel"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_above="@+id/setChatName"
android:text="@string/set_chat_name"
android:layout_centerHorizontal="true"
android:textSize="18sp"
android:textColor="@color/app_text"
android:visibility="gone" />
<com.ajapps.app.floatingactionbutton.AddFloatingActionButton
android:id="@+id/goToChat"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
fab:fab_icon="@drawable/send"
android:background="@drawable/button_pressed2"
fab:fab_plusIconColor="@color/half_black"
fab:fab_colorNormal="@color/red"
fab:fab_colorPressed="@color/red_pressed"
android:layout_centerVertical="true"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true"
android:visibility="gone" />
<EditText
android:id="@+id/setChatName"
android:inputType="textCapWords"
android:lines="1"
android:maxLength="20"
android:layout_width="160dp"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:background="@drawable/edit_text"
android:layout_marginTop="15dp"
android:visibility="gone" />
</RelativeLayout>
我查看了我的 style.xml，看不到任何会影响它的东西。
这是我的主题:
<resources>
<style name="AppTheme"
parent="Theme.AppCompat.Light.DarkActionBar">
<item name="colorPrimary">@color/ColorPrimary</item>
<item name="colorPrimaryDark">@color/ColorPrimaryDark</item>
<item name="android:icon">@android:color/transparent</item>
<item name="windowActionBar">true</item>
<item name="android:textColorPrimary">#000000</item>
</style>
<style name="Match">
<item name="android:layout_width">match_parent</item>
<item name="android:layout_height">match_parent</item>
</style>
<style name="Wrap">
<item name="android:layout_width">wrap_content</item>
<item name="android:layout_height">wrap_content</item>
</style>
<style name="MatchWidth" parent="Match">
<item name="android:layout_height">wrap_content</item>
</style>
<style name="ScrollView" parent="Match">
<item name="android:fillViewport">true</item>
</style>
<style name="LinearLayout" parent="Match">
<item name="android:orientation">vertical</item>
</style>
<style name="RobotoTextView" parent="Wrap">
<item name="android:textColor">@color/green_light</item>
<item name="android:layout_gravity">center</item>
</style>
<style name="RobotoTextView.Number">
<item name="android:textSize">@dimen/text_size_fragment_number</item>
</style>
<style name="RobotoTextView.Fragment">
<item name="android:textSize">@dimen/text_size_xlarge</item>
</style>
<style name="menu_labels_style">
<item name="android:background">@drawable/fab_label_background</item>
<item name="android:textColor">@color/white</item>
<item name="android:colorPrimaryDark">@color/orange</item>
</style>
</resources>
最佳答案
只是改变
public class Login extends Activity {
}
public class Login extends AppCompatActivity {
}
关于android - 我的应用程序不会显示 ActionBar，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/33463676/