Develop Reference

Programmatically show Layout to preface an activity

What I want to do:
I want to have multiple activities each prefaced with a page explaining to the user what the activity is about.
What I'm currently doing:
So my main class BaseModuleActivity extends Activity and I am trying to write a function called showTutorial() which will explain the next steps to the users.
Here is my attempt in doing so:
public void showTutorial(String title, String explanation){
setContentView(R.layout.tutorial_screen);
TextView tv1 = (TextView)findViewById(R.id.tutoTextTitle);
tv1.setText(title);
TextView tv2 = (TextView)findViewById(R.id.tutoTextExplanation);
tv2.setText(explanation);
findViewById(R.id.tutoButton).setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
// Perform action on click
//remove the tutorial's view
findViewById(R.id.tutoLayout).setVisibility(View.GONE);
}
});
}
And this method is called in the following:
public class myFirstActivity extends BaseModuleActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_first);
//First show tuto
super.showTutorial(getString(R.string.upTitle),getString(R.string.upExplanation));
//TODO then actually do the activity stuff
/*
(findViewById(R.id.next_button)).setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
finish();
}
});
*/
}
}
Problem:
I think the problem is mainly conceptual. I don't know the best approach to do this and the approach I'm taking is not working.
What I'm doing is not working because the view just become empty. I thought setting the visibility of the linearLayout to gone would make it disappear and the actual activity will able to take place.
What I need:
I need to understand if I can do what I want with my approach or not? Or what approach should I take.
I found some similar questions. However, the answer to these questions didn't seem to fit my problem.
I also looked into layout inflater and fragment, but layout inflater seem to be more for listView and fragment uses layout inflater.

Well, there are some approaches to show a guide for your activity (or application).
First one, and probably the easiest, is to show a dialog/TextView when user enters an activity and explain the activity guide in that dialog/TextView using plain text. From your explanation, I think this one is what your are trying to do.
Second one is to use something like slides with pictures to explain about your activity (like Google Sheets application).
Third one is to explain each control in your activity separatly by highlighting them (similar to how Go Launcher explains its feature on first launch)
You can find more info in below links:
How to implement first launch tutorial like Android Lollipop apps: Like Sheets, Slides app?
Android - first launch interactive tutorial

Seems that what you want is actually an introduction. Take a look at this project:
https://github.com/rubengees/introduction
From each introduction page you can launch the correspondent activity.

How to link buttons to internal Webview with different sites?

I am writing this cause I was searching for days to get an answer on my question but I didn't find any answers . . .
I am like for a month using android studio and everything is going perfect but . . . I cant find an solution to something, I added some buttons into a layout and I wat that when I click on the button it redirects me to my Webview. I want to use only one Webview and every time when I click one of the buttons it had to go to another website in the Webview. I tried many of things I found on SO but couldn't find the right answer.
Could you please help me?

Call WebView's loadUrl() method inside the listeners of your buttons:
my_button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
my_webView.loadUrl("www.some_url.com");
}
});
You can always change your webview's url to what you need depending on the button you clicked.

I fixed it.. I had to do this in the webview activity:
public class Webview extends Activity {
Sorry had the wrong activity at the end!

Too many Activities in Android App. Any alternatives?

I am creating my first app. In this app, I have an expandable list with many items. When I select any of these items, I want several paragraphs to be displayed. Do I need to create an Activity for each of these items if text is the only thing I want displayed? I know that there has to be an easier way. I did create it like this at first and it seemed very bulky (30+ activities), so now I have it set up so that when an item is selected, the setContentView opens the corresponding layout with the text that needs to be displayed. This works but there is a catch, whenever I hit the back button, it takes me back to my main activity class and not my expandable list class. I want the user to be able to go back and select something else from the list. Any guidance as to what I need to do would be appreciated.

I would suggest creating string resources for each item you would like to display, then creating one activity with a TextView. Then, instead of creating new intents for each activity, create an intent that goes to the new activity, and add an extra that contains the text for the TextView. For example:
Activity1:
myButton.setOnClickListener(new OnClickListener(){
public void onClick(View v) {
Intent intent = new Intent(this, ParagraphView.class);
intent.putExtra("textData", getResources().getString(R.string.myText));
getBaseContext().startActivity(intent);
}
});
In the onCreate of the viewer, add this to get your TextView:
Intent intent = getIntent();
String textData = intent.getStringExtra("text");
Now, we need to write the text into the TextView:
TextView tv = (TextView) findViewById(R.id.myTextView);
tv.setText(textData);
All you have to to is set up your string resources and button click listeners. You may consider this easier than having lots of activities (it's definitely easier to manage entries this way) but does require a bit of setup.
Edit: Thanks to #ianhanniballake for pointing out a much better way (I don't even know what I was thinking at the time...)
Edit2: Wow, I REALLY messed up my code. (Hopefully) Fixed now

Which is better in implementing click listener?

Which is a good practice in implementing click listener and why? Or is there a better way other than the two? Thanks.
First :
sampleButton.setOnClickListener(new View.OnClickListener(){
public void onClick(View v){
// do something
}
});
Second : implement OnClickListener then override onClick method?

The third option is to set the listener directly in your XML layout:
android:onClick="myClickHandler"
and then implement it in your Activity:
public void myClickHandler(View v){
// do something
}

You're technically doing the 2nd thing with the 1st one. The 1st case uses whats called an anonymous class which implements OnClickListener, but since is anonymous, doesn't have a class name and isn't editable from external classes. Explicitably implementing OnClickListener is useful if you expect to use the same onClick functionality in multiple different locations, or if the click code is long

The first approach is used when you want to perform the action only for a particular case, if many click events require the same action then use the second one.

Android - Basic question - link TextView to open new page (internal)

Probably a really basic answer to this but google is throwing up nonsense.
Ok, so i have a bunch of nested linear layouts, each one contains a textview and an imageview. What i want is my textview to be linked so that when a user clicks on the text, it will take the user to a new page that is in the same project. Not a website or anything.
Appreciate any help!!

You can add an onTouchListner to you TextViews and when user clicks on it you simply launch a new Activity. Google for adding touch listeners and then for launching activities and you will find the components you need.
Activities are like pages in Android apps.

Yeah, Juhani's right. You can use an onTouchListener. It's actually really simple. Just create a new .java file that loads the Layout you want in the onCreate. In the code you just use this line for the onClickListener:
startActivity(new Intent(this, newjavafile.class));
and add the new Activity to your manifest. I had something close to this exact problem. The nice thing about doing it this way is the back button on the phone/device works to get you back to the main screen.

First write attribute in TextView Like,
<TextView
android:id="#+id/text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:clickable="true"
android:text="Click Here" />
And in Java File
TextView text= (TextView) findViewById(R.id.text);
text.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
startActivity(new Intent(this,SecondActivity.class));
}
});