I am trying to understand the tab activities in android.. and working around with few examples.I have three tabs Tab1,Tab2,Tab3.. in which when I click each tab it will display a simple textview.this is fine for me.Now, I added a button in Tab1 and I tired to handle the click event... its not working for me.It says "App has stopped".
Below is the Tab1 activity....
EDIT1:I am a starter..In Android sdk it comes with a default API demo project.In that project, for 2.x Andriod OS.. the same method works.They are able to handle this click event in that ta activity.
public class Tab1 extends Activity
{
private Button bt_AddAcc = null;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.bt_addaccount);
bt_AddAcc = (Button)findViewById(R.layout.bt_addaccount);
bt_AddAcc.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
//Toast.makeText(getApplicationContext(), "Uername:",Toast.LENGTH_LONG).show();
}
});
}
}
TabActivity is already deprecated.
I suggest you look at the ActionBar or when you want to develop for Android 2.x as well then take a look at ActionBarSherlock. This is a third party library which implements the ActionBar on older devices.
Related
In Android Studio, I am trying to open the second activity when corresponding button is pressed.However, I cannot reach that listener that I create in "onCreate" from onPause. I am following an approach like this:
public class MainActivity extends Activity {
private View.OnClickListener openSecondPage = new View.OnClickListener() {
#Override
public void onClick(View v) {
Button button_newPage = findViewById(R.id.button_newpage);
button_newPage.setText("Clicked");
Intent secondPage = new Intent(getApplicationContext(), SecondActivity.class );
startActivity(secondPage);
}
};
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button button_newPage = findViewById(R.id.button_newpage);
button_newPage.setOnClickListener(openSecondPage);
}
public void onPause(){
super.onPause();
Button button_newPage = findViewById(R.id.button_newpage);
//Destroy the on click listener
button_newPage.setOnClickListener(null);
}
}
Also user will be able to come back to main activity and then go back to the second activity again. In that case I don't want to open a new activity. Instead I want to open previously created activity. For that case should I create a onResume() method and in that, call startActivity(secondPage). But in that case, since the secondPage is declared in onStart I won't be able to use in onResume. How can I handle that situation?
So there are actually 2 questions.. sorry about that, I didn't want to open 2 different questions for it.
Put Button button_newPage = findViewById(R.id.button_newpage); and button_newPage.setOnClickListener(openSecondPage); inside onResume instead of onCreate, like so:
#Override
protected void onResume() {
super.onResume();
Button button_newPage = findViewById(R.id.button_newpage);
button_newPage.setOnClickListener(openSecondPage);
}
That should solve at least part of your problem.
HomeActivity.java
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.home);
Button btnopen = (Button)findViewById(R.id.btnWindowAnimation);
btnopen.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent slideactivity = new Intent(HomeActivity.this, CartActivity.class);
Bundle bndlanimation =
ActivityOptions.makeCustomAnimation(getApplicationContext(), R.anim.animation,R.anim.animation2).toBundle();
startActivity(slideactivity, bndlanimation);
}
});
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.layout.home, menu);
return true;
}
HomeActivity has a button and it will help to slide the 1st screen and bring the second screen.
animation.xml
android:fromXDelta="100%p"
android:toXDelta="25%p"
android:duration="5000"
This animation code is helping me to slide my screen after pressing the button. As shown in this video
https://www.youtube.com/watch?v=EzgGGWpRES0
I want to stop the new screen at the middle without covering the 1st screen completely.
Any suggestions? I have used another activity called cart( i haven't used fragments here)
Sounds like you want a NavigationDrawer.
You can find out more information on the Android developer site:
https://developer.android.com/design/patterns/navigation-drawer.html
https://developer.android.com/training/implementing-navigation/nav-drawer.htmlA
Your Requirement is to partially Display an Overlapping Activity on an Existing Activity. This is Possible with Sliding Menu Library (Which does not mean to technically create a floating Activity, but to create a Floating View integrated within the Sliding Menu that will be displayed partially on top on an Activity).
In case, if you are regarding this as some sort of Default Menu then please take a look at this Image
If this is your actual Requirement, then here are the details for you.
Sliding Menu Library is an OpenSource Library, you can use it for displaying a partially visible Sliding Menu on top of an Activity.
Here is the link of Sliding Menu Lib :
https://github.com/jfeinstein10/SlidingMenu
You can navigate to the example directory present in this Project for the demonstration of it's Usage.
I hope thie helps :)
I am very new to mobile development, this isn't homework I am working ahead of my class, I developed a simple app that has a button and when it's pressed it shows a message "Hello Android". I would like to build on this and change the color of the background when the onClickListener is called, I will post my code below, I am asking for the best approach to achieve my goal (change background). I want to iterate that this code below works, and that I am not asking for anything to do with the code I have presented, I want to add to it to change the background color (it's currently white, I'm assuming by default). Oh and I have never worked with Java before (very difficult course teaching android/iOS/WinMobile in 1 class). Thank you.
public class MainActivity extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
setupMessageButton();
}
private void setupMessageButton() {
// 1. Get a reference to the button
final Button messageButton = (Button) findViewById(R.id.helloDroidButton);
//Set the click listener to run my code.
//Code will run when user clicks button.
messageButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// Anonymous class? --> not sure what he means
Log.i("DemoButtonApp", "Hello Android!");
Toast.makeText(
MainActivity.this,
"Hello Android!",
Toast.LENGTH_LONG
).show();
}
});
}
Android support feature called Selector , that help you to change the background of any view in each state of it like pressed , forces and so one , take look on this useful tutorial and feed me back in any not obvious point
http://www.mkyong.com/android/android-imagebutton-selector-example/
hope it help you
I have an Android application with a MainActivity and I do this to create navigational tabs in onCreate:
ActionBar myActionBar = getActionBar();
myActionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
Tab tab = myActionBar.newTab().setText("FirstTab").setIcon(R.drawable.first_tab)
.setTabListener(new TabListener<FirstTabFragment>(this, "FirstTab",
FirstTabFragment.class));
... more tabs ...
The TabListener, I use this from developer.android.com:
http://developer.android.com/reference/android/app/ActionBar.html#newTab():
public static class TabListener<T extends Fragment> implements ActionBar.TabListener {
...
public TabListener(Activity activity, String tag, Class<T> clz) { ... }
}
So if a user clicks on the first tab, my fragment FirstTabFragment is called and executes onCreateView.
My problem is, if a user now clicks a button I do the following and I do not know how to switch to the next fragment:
private OnClickListener firstTabListener = new OnClickListener() {
#Override
public void onClick(View v) {
if (v == button1) {
Intent intent = new Intent(???, MyDetailsFragment.class);
startActivity(intent);
} else if (...) {
...
}
}
};
The MyDetailsFragmentshould show details to the selected item (button click), so I want to drill down to the details fragment and want to give some extra data to the new fragment, so the detail fragment knows which details of which selected item it should display.
The selected tab should not change and the back button should go back to the FirstTabFragment page.
I think I should start a new fragment, but it is not possible, the name of the method startActivity tells me that I start a new activity and not a fragment. So, I have to use the MainActivity and put into there the new fragment?
(I do not use the android-support-v4.jar library, because I only target Android 4 devices)
How can I solve this problem? Any ideas?
From the fragment, call a method on the hosting activity, telling it about the button click event. The activity can then do whatever is appropriate.
Personally, I think that totally replacing the contents of a tab is inappropriate in the vast majority of cases, but you are certainly welcome to do it.
i have this code but every time i run the app and click on my button it crashes and i don't get why.. am i doing something wrong here any help would be great thanks
im trying to got to the "Sec.class" page/class
public class APPcalendarActivity extends Activity implements OnClickListener{
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
View continueButton = findViewById(R.id.continue_button);
continueButton.setOnClickListener( (OnClickListener) this);
}
//#Override
public void onClick(View v) {
// TODO Auto-generated method stub
switch (v.getId()) {
case R.id.continue_button:
Intent i = new Intent(this, Sec.class);
startActivity(i);
break;
}
}
THIS IS WHAT I WAS MISSING IN THE MANISFEST.XML FILE
and i want to slap the person who downgraded my question
<activity android:name=".Sec"
android:label="#string/sec" >
</activity>
Check that you've declared an <activity> tag for the Sec activity in your AndroidManifest.xml.
But posting (or simply reading) the crash stacktrace from logcat would be more instructive.
Without knowing what the error is, it is really hard to guess what the problem is, but usually when this happens, the button (continueButton in your case) could not be found in the layout. So make sure that you have a View with id continue_button in main.xml.