I am trying to make an action bar in my app. I have already hide the default action bar but it is not showing my action bar.
I am using code from :-
http://developer.android.com/guide/topics/ui/actionbar.html
public class MainActivity extends Activity {
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.activity_category, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
return super.onOptionsItemSelected(item);
}
}
here is code for menu:-
Related
I have problem with my school project when I want to back to my CurentCourseActivity using back button form action bar I have NE
Attempt to invoke virtual method 'java.util.List `com.example.pingu.mylanguages.Language.getList()' on a null object reference at
com.example.pingu.mylanguages.CurentCourseActivity.onCreate(CurentCourseActivity.java:37)`
While I use normal back button problem is not appear.
When we choose Lesson from GridView that makes a new activity. When we choose the back button from ActionBar then I have NE.
CourentCourseActivity:
public class CurentCourseActivity extends AppCompatActivity {
private Language language;
#Override
protected void onCreate(Bundle savedInstanceState) {
Log.d("s","onCreate");
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_curent_course);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
if (savedInstanceState!=null){
language = (Language) savedInstanceState.getSerializable("Lang");
Log.d("xx","Coś ma");
}
if (getIntent().getExtras() != null) {
language = (Language) getIntent().getSerializableExtra("Lang"); //Obtaining data
}
GridView grid = (GridView) findViewById(R.id.grid);
CurrentCourseAdapter adapter = new CurrentCourseAdapter(this, R.layout.grid_item_curent_course, language.getList());
grid.setAdapter(adapter);
grid.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
Intent intent = new Intent(CurentCourseActivity.this,LessonActivity.class);
intent.putExtra("Lesson",(Lesson)language.getList().get(i));
startActivity(intent);
}
});
getSupportActionBar().setTitle(language.getName());
}
}
LessonActivity:
public class LessonActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_lesson);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
if(getIntent().getExtras()!=null){
Lesson lesson = (Lesson) getIntent().getSerializableExtra("Lesson");
getSupportActionBar().setTitle(lesson.getNamel());
}
}
}
The answer is simplest then I expect. So I need to overide this button and do it as normal back button because ActrionBar back button destroy parent activity.
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case android.R.id.home:
onBackPressed();
return true;
}
return super.onOptionsItemSelected(item);
}
I have two activities namely mainactivity and main2activity. Mainactivity has three buttons and main2activity has list view.
When I click button string is passed to main2activity and is displayed in main2activity.
So now I want also image in listview. corresponding image for button selected. Below are my codes.
MainActivity
public class MainActivity extends AppCompatActivity {
EditText editText;
Button addButton;
String text1 ="Item 1";
String text2 ="Item 2";
String text3 ="Item 3";
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
Button button1 = (Button)findViewById(R.id.button1);
button1.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent(MainActivity.this,Main2Activity.class);
intent.putExtra("text",text1);
startActivity(intent);
}
});
Button button2 = (Button)findViewById(R.id.button2);
button2.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent(MainActivity.this,Main2Activity.class);
intent.putExtra("text",text2);
startActivity(intent);
}
});
Button button3 = (Button)findViewById(R.id.button3);
button3.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent(MainActivity.this,Main2Activity.class);
intent.putExtra("text",text3);
startActivity(intent);
}
});
}
Main2activity
public class Main2Activity extends AppCompatActivity {
ListView listView;
ArrayAdapter<String> adapter;
#Override
protected void onRestart() {
super.onRestart();
adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, Global.list1);
listView.setAdapter(adapter);
if (Global.list1.size() < 1) {
Global.list1 = new ArrayList<>();
}
}
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main2);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
Intent intent1 = getIntent();
listView = (ListView) findViewById(R.id.list);
adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, Global.list1);
listView.setAdapter(adapter);
String havestring = intent1.getStringExtra("text");
if (havestring != null) {
Global.list1.add(havestring);
adapter.notifyDataSetChanged();
}
Button backbtn = (Button) findViewById(R.id.backbtn);
backbtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent(Main2Activity.this, MainActivity.class);
startActivity(intent);
}
});
}
}
row.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal">
<ImageView
android:id="#+id/imageview"
android:layout_width="60dp"
android:layout_height="60dp"
android:padding="5dp" />
<TextView
android:id="#+id/textview2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="10dp" />
</LinearLayout>
So how to set custom adapter that will add corresponding image with string added.
Can it be done using if else statement in custom adapter???
Please do help me
for same.
Can anyone help me out???
this is my Setting class:
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
addPreferencesFromResource(R.xml.prefs);
}
Please help me guys how can set ACTIONBAR, TITLE and BACLBUTTON like AppcompactActivity
This is my main Activity:
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
SharedPreferences settings = PreferenceManager.getDefaultSharedPreferences(this);
boolean first =settings.getBoolean("first",false);
String rings=settings.getString("ringtone","Default Rings");
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
if (id == R.id.action_settings) {
Intent intent= new Intent(MainActivity.this,SettingClass.class);
startActivity(intent);
return true;
}
return super.onOptionsItemSelected(item);
}
[Activity]
public class MainActivity : Activity
{
public string[] items = new string[100]; // string to store data from editText
int i =0;
ArrayAdapter<string > adapter;
protected override void OnCreate(Bundle savedInstance)
{
base.OnCreate(savedInstance);
SetContentView(R.Layouts.MainLayout);
var btn1= FindViewById <Button> (R.Ids.btn1);
btn1.Click += AddItem; // calls a function on button click to add data to listview
}
public void AddItem(object sender,EventArgs eventargs)
{
try
{
var et1 = FindViewById <EditText>(R.Ids.et1);
items[i] = et1.Text.ToString();
i++;
view(); //to add data to listview
}
catch(Exception ex)
{
error(ex.ToString());
}
}
public void view ()
{
adapter = new ArrayAdapter<string>(GetApplicationContext(),Android.R.Layout.Simple_list_item_1,items);
ListView listview = FindViewById<ListView>(R.Ids.listview1);
listview.SetAdapter(adapter);
listview.SetTextFilterEnabled(true);
}
}
You should not call view() from AddItem because all code in view is initialization code. Rename it initList or so and call it from OnCreate.
You also don't need items (or i). Just add the string to adapter.
-- EDIT
[Activity]
public class MainActivity : Activity
{
private ArrayAdapter<string> adapter;
protected override void OnCreate(Bundle savedInstance)
{
base.OnCreate(savedInstance);
SetContentView(R.Layouts.MainLayout);
ListView list = FindViewById<ListView>(R.Ids.list);
adapter = new ArrayAdapter<string>(this, Android.R.Layout.Simple_list_item_1);
list.SetAdapter(adapter);
Button button = FindViewById<Button>(R.Ids.button);
button.Click += button_Click;
}
void button_Click(object sender, EventArgs e)
{
EditText text = FindViewById<EditText>(R.Ids.text);
adapter.Add(text.Text.ToString());
}
}
I have an action bar spinner and two Activities in my app. The spinner, which is populated from a database, needs to be visible in both my activities. How should I generate it without duplicating my code? Should I create a static method or something else?
private NotesDbAdapter mDbHelper;
private List<String> listUniqueCat;
int selectedPos;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_joke_details);
mDbHelper = new NotesDbAdapter(this);
mDbHelper.open();
//this method returns list of strings from a database
listUniqueCat = mDbHelper.getUniqueCategories();
// create an array adapter to popluate dropdown list
ArrayAdapter<String> adapter = new ArrayAdapter<String>(
getBaseContext(),
android.R.layout.simple_spinner_dropdown_item, listUniqueCat);
// enable dropdown list naaavigation in action bar
getActionBar().setNavigationMode(ActionBar.NAVIGATION_MODE_LIST);
// defining navigation listiner
ActionBar.OnNavigationListener navigationListener = new OnNavigationListener() {
#Override
public boolean onNavigationItemSelected(int itemPosition, long itemId)
{
selectedPos = getActionBar().getSelectedNavigationIndex();
Toast.makeText(getBaseContext(), "selected index is "+ selectedPos ,
Toast.LENGTH_LONG).show();
return false;
}
};
// setting dropdown items and item navigation listener for action bar
getActionBar().setListNavigationCallbacks(adapter, navigationListener);
}
I think you need to create one BaseActivity with tabs like
abstract public class BaseActivity extends FragmentActivity {
}
and all other activities extends BaseActivity
small example for you
BaseActivity.java
abstract public class BaseActivity extends Activity implements TabListener {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_first);
ActionBar actionBar = getActionBar();
// add tabs to actionbar
actionBar.addTab(actionBar.newTab().setText("TAB 1")
.setTabListener(this));
actionBar.addTab(actionBar.newTab().setText("TAB 2")
.setTabListener(this));
}
}
FirstActivity.java
public class FirstActivity extends BaseActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_first);
}
#Override
public void onTabReselected(Tab tab, FragmentTransaction ft) {
// TODO Auto-generated method stub
}
#Override
public void onTabSelected(Tab tab, FragmentTransaction ft) {
Toast.makeText(getApplicationContext(),
tab.getText() + " selected in FirstActivity",
Toast.LENGTH_SHORT).show();
}
#Override
public void onTabUnselected(Tab tab, FragmentTransaction ft) {
// TODO Auto-generated method stub
}
}
SecondActivity.java
public class SecondActivity extends BaseActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_first);
}
#Override
public void onTabReselected(Tab tab, FragmentTransaction ft) {
// TODO Auto-generated method stub
}
#Override
public void onTabSelected(Tab tab, FragmentTransaction ft) {
Toast.makeText(getApplicationContext(),
tab.getText() + " selected in SectondActivity",
Toast.LENGTH_SHORT).show();
}
#Override
public void onTabUnselected(Tab tab, FragmentTransaction ft) {
// TODO Auto-generated method stub
}
}