i am trying to implement ShineButton in my project . I have successfully synced the library to the gradle and added shine button in the xml.
now when i am trying to write the java code
public class MainActivity extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button b1 = (Button)findViewById(R.id.button);
b1.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Toast.makeText(getApplicationContext(), "Kill bill", Toast.LENGTH_SHORT).show();
}
});
ShineButton shineButton = (ShineButton) findViewById(R.id.po_image2);
shineButton.init(context);
}
}
.init(activity); is showing cannot resolve symbol activity.
You don't literally copy the code verbatim, you read the documentation and object types supported by the method.
public void init(Activity activity) {
For example, I assume you are running that from an activity based on the usage of findViewById? Then you need "this instance of the Activity"
shineButton.init(this);
or an instance of an Activity if you were in a Fragment
shineButton.init(getActivity());
If the code is in Activity use shineButton.init(Activityname.this).
If it is in
fragment use shineButton.init(getActivity()).
Read this: https://docs.oracle.com/javase/tutorial/java/nutsandbolts/ and this https://developer.android.com/training/index.html
Change:
shineButton.init(context);
To:
shineButton.init(MainActivity.this);
MainActivity.this holds the instance of MainActivity class and can be used to initialise the view.
Related
this is my first post here. I used the search function and could not find a complete answer,so I hope this is not a redundant question.
I should note that I m really new to coding so maybe I did find an answer but did not realise it.
I have been asked in class to find two different ways to fill the argument in the code below.
public class MainActivity extends AppCompatActivity implements View.OnClickListener {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button button = (Button)findViewById(R.id.button);
button.setOnClickListener(this);
}
#Override
public void onClick(View v) {
Toast.makeText(???,"Clicked!", Toast.LENGTH_LONG).show();
the first way i suppose would be toast.makeText(MainActivity.this.getActivity(),....).show();
the second one?
Use the MainActivity context.
Toast.makeText(MainActivity.this,"Clicked!", Toast.LENGTH_LONG).show();
v.getContext() and this both can be used
I have just started working with Butterknife library and written the following code:
class myActivity extends AppCompatActivity
{
#BindView(R.id.button) Button app1;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ButterKnife.bind(this);
}
public void selectApp(View b)
{
Button clicked=(Button)b;
if(clicked==app1)
Toast.makeText(this,"First App clicked",Toast.LENGTH_LONG).show();
}
}
here selectApp is attached through onClick in the xml view file.
But the problem is clicked==app1 is returning false even when pressing app1. The method is being called but the if condition is coming false.
Can anybody clarify.
Thanks
I think this would work:
if(clicked.getId()==R.id.button)
Also, you can use View b and not parse into a button:
if(b.getId()==R.id.button)
¿Is this your actual code? seems to lack an annotation on the method.
Working on my first Android project and needed to add a settings activity for program settings. I created a MainActivity with a single button to test the settings activity.
I created the default SettingsActivity from Android Studio (didn't change anything).
Tried calling the Settings Activity via a click on the button from the main activity. Getting the following error:
Cannot Resolve Constructor 'Intent(android.view.View.OnClickListener...
The Settings Activity is called ProgramSettingsActivity and is the default code that AndroidStudio creates... for now. The beginning of it reads...
public class ProgramSettingsActivity extends PreferenceActivity {
private static final boolean ALWAYS_SIMPLE_PREFS = false;
#Override
protected void onPostCreate(Bundle savedInstanceState) {
super.onPostCreate(savedInstanceState);
setupSimplePreferencesScreen();
}
...
The code in the mainActivity is as follows:
public class MainActivity extends ActionBarActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button button=(Button)findViewById(R.id.myButton);
button.setOnClickListener(new Button.OnClickListener(){
public void onClick(View v) {
Intent i = new Intent(this,ProgramSettingsActivity.class);
startActivity(i);
}
});
}
...
Not sure where to go from here... I am obviously missing something obvious.
Thanks for any help....
Use Intent i = new Intent(MainActivity.this,ProgramSettingsActivity.class);
Inside anonymous class new Button.OnClickListener(){} this refers to the instance of this class, not its enclosing MainActivity class. That's how it happens.
If I want to design a button that all java can use it without need to write it in every java,
what should I do?
For Example:
I design a Button.OnClickListener function to search bluetooth devices.
but another java also need to use this Button.OnClickListener function,
I don't want to write same way on two java.
ledWrite.xml:
<Button android:id="#+id/btnScan" />
<ToggleButton android:id="#+id/tBtnWrite" />
bluetoothUtils.java
// Intent request codes
private static final int REQUEST_CONNECT_DEVICE = 1;
private Button button_scan;
button_scan = (Button)findViewById(R.id.button_scan);
button_scan.setOnClickListener(new OnClickListener(){
public void onClick(View v) {
scanbt();
}
});
private void scanbt(){
Intent serverIntent = new Intent(this, DeviceListActivity.class);
startActivityForResult(serverIntent, REQUEST_CONNECT_DEVICE);
}
then I design LedWrite.java:
private ToggleButton digitalOutBtn; //LED On/OFF
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.ledwrite);
digitalOutBtn = (ToggleButton)findViewById(R.id.tBtnWrite);
digitalOutBtn.setOnClickListener(new OnClickListener()
public void onClick(View v){
if(digitalOutBtn.isChecked()){ //sendMessage("D1"); }
else{sendMessage("D0";}
}
How can I use button_scan in LedWrite.java?
If you want to call a method defined is some other Activity on press of a button, then you can make that method as static.
Let's assume that you have a method named searchBluetooth() in MainActvity and you want to call it from SecondActivity.
Define searchBluetooth() in MainActvity like,
public static void searchBluetooth()
Call this method from SecondActivity like,
MainActivity.searchBluetooth()
If you don't want to use static because of memory consumption then try with inheritance.
Create a class CommonActivity which extends Activity class
class CommonActivity extends Activity
{
// here define your searchBluetooth method
public void searchBluetooth()
{
// your code here
}
}
If you want to make use of it in Second Activity then
class SecondActivity extends CommonActivity
{
// here you can access `searchBluetooth()` method
}
enclosure a BluetoothListener class?
public BluetoothListener implements OnClickListener {
#Override
public void onClick(View v) {
do something you want...
}
}
then invoke the class in two different class, eg,
button.setOnClickListener(new BluetoothListener());
I recently started learning android and this answer may have some error, if so, please let me know, Thanks.
The following code was copied from project one and pasted into project two. No errors in project one. In project two I get:
The method onClick(View) of type new View.OnClickListener((){} must override a superclass method
implements androd.view.View.OnClickListener.onClick
The project settings look the same, but I must be missing something.
private Button mCompany = null;
public class About extends Activity{
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.about);
setTitle(R.string.title_about);
mCompany = (Button)findViewById(R.id.about_company_button);
mCompany.setOnClickListener( new OnClickListener() {
#Override
public void onClick(View arg0) {
Intent intent = new Intent(Intent.ACTION_VIEW);
intent.setData(Uri.parse(getResources().getString(R.string.app_company_website)));
startActivity(intent);
}
});
Found a solution on another site but I would like to know why this will work. It said to comment out the Override. Actually, it now compiles fine but crashes when the about item is clicked.