I created a project that use RecyclerView and CardView (for PointOfInterest). These 5 activities are relate to each other :
PointOfInterest.java
PlacesAdapter.java
Places.java
layout_poi.xml
activity_point_of_interest.xml
Meanwhile in activity_main.xml I design the Main Menu together with some buttons. One of the button named Rapid Penang (id: rapid_btn). I call an activity of Rapid Penang (from MainActivity.java) like below:
public class MainActivity extends AppCompatActivity {
private Button button_for_rapid;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// to call Rapid Penang class
button_for_rapid = (Button) findViewById(R.id.rapid_btn);
button_for_rapid.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
openRapid();
}
});
}
public void openRapid()
{
Intent intent_rapid = new Intent(this, RapidPenang.class);
startActivity(intent_rapid);
}
}
RapidPenang consist of only one activity and it is success. But when I try to do exactly the same to PointOfInterest activites (as mention above), suddenly the app were crashed.
This is how I try to open PointOfInterest activites from a button in MainMenu called Point Of Interest:
private Button button_for_poi;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// to call Point Of Interest class
button_for_poi = (Button) findViewById(R.id.poi_btn);
button_for_poi.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
openPOI();
}
});
}
public void openPOI()
{
Intent intent_poi = new Intent(this, PointOfInterest.class);
Intent intent_poi2 = new Intent(this, PlacesAdapter.class);
Intent intent_poi3 = new Intent(this, Places.class);
startActivity(intent_poi);
}
Firstly check your activity is define in Android manifest file and then call
StartActivity(new Intent(getApplicationcontext(),RapidPenang.class));
That's it
Related
I'm trying to start another activity by pressing on the cardview which has a friend finder id. But when I write home.java it gives me problems in the setOnClickListener. At homeActivity it tells me Cannot resolve method 'homeActivity' in 'HomeActivity'. because?
public class HomeActivity extends AppCompatActivity {
private CardView btn_home;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btn_home = findViewById(androidx.appcompat.R.id.home);
btn_home.setOnClickListener(v -> homeActivity(new Intent(HomeActivity.this, TrovamicoActivity.class)));
}
btn_home.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Intent intent = new Intent(HomeActivity.this, TrovamicoActivity.class);
startActivity(intent);
}
});
If there is no code in the manifest, write it
<activity android:name=".TrovamicoActivity" />
Probably something I do not understand.
In the application programs (from google play), if we move from the main activity to the second and then back to the main, then after pressing the "back" button on the phone, the application closes.
I tried to make my own applications with two activities, but it did not work as it should. When the main activity goes to the second and then I go back to the main, then after pressing the "back" button on the phone, the application instead of closing, it goes back to the second activity, then back to the main and it just closes.
What am I doing wrong ?
public class MainActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button Act2Butt = (Button) findViewById(R.id.Act2Butt);
Act2Butt.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent(MainActivity.this, Main2Activity.class);
startActivity(intent);
}
});
}
.
public class Main2Activity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main2);
Button Act1Butt = (Button) findViewById(R.id.Act1Butt);
Act1Butt.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent(Main2Activity.this, MainActivity.class );
startActivity(intent);
}
});
}
}
To go back to MainActivity from Main2Activity, you need to call onBackPressed() or finish(), instead of startActivity.
The button are appearing over the main screen, but on clicking on them, nothing is happening.
This is my MainActivity.java file
public class MainActivity extends Activity implements View.OnClickListener
{
Button brsignin;
//ImageView image1;
Button Voicerecog;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
brsignin = (Button) findViewById(R.id.brsigin);
//image1 = (ImageView) findViewById(R.id.image1);
Voicerecog = (Button) findViewById(R.id.Voicerecog);
}
#Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.brsigin:
Intent i = new Intent(this,signin.class);
startActivity(i);
break;
case R.id.Voicerecog:
Intent j = new Intent(this, VoiceRecognitionActivity.class);
startActivity(j);
break;
}
You missed the line: yourButton.setOnClickListener(this);
You must add setOnClickListener to make system recognizes that your class is using On Click Listener class
brsignin.setOnClickListener(this);
Voicerecog.setOnClickListener(this);
I have this piece of code to start a new activity in my android test app
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button btnpriv = (Button)findViewById(R.id.btn_priv);
btnpriv.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent i = new Intent(getApplicationContext(), PrivateActivity.class);
startActivity(i);
}
});
This works as it should. At button press it changes to the new PrivateActivity. But it is a no-animation change. How can I make it f.x. slidein the new activity to have a nice transition?
So I have this code in my main activity to start a new one:
public class MainActivity extends Activity
{
#Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
findViewById(R.id.GoButton).setOnClickListener(new View.OnClickListener()
{
public void onClick(View v)
{
Intent myIntent = new Intent(MainActivity.this, NewActivity.class);
MainActivity.this.startActivity(myIntent);
//finish();
}
});
}
}
My new activity extends ListActivity and when I call this code by pressing the button it crashes the application. However if I make the MainActivity extend ListActivity then it works great (although I have to replace the button with a List!). Does anyone know why this happens, and how can I make it work using the code above?
Thanks
Have you added the manifest entry