I'm developing an APP for a schoolwork. When I launch my app, I configured 4 buttons, one of them is a calendar.
What I want is when I click on Calendar, this open the Google calendar; or if I don't have installed it, take you to Google Play.
The other buttons are activities in the same application, but these are solved.
The main activity:
public class MainActivity extends Activity {
#Override
protected void onCreate (Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
entrarboton();
}
private void entrarboton() {
ImageButton accionentrar = (ImageButton) findViewById(R.id.imageButton0);
accionentrar.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
startActivity(new Intent(MainActivity.this,Calendari.class));
}
});
ImageButton accionentrar2 = (ImageButton)findViewById(R.id.imageButton3);
accionentrar2.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
startActivity(new Intent(MainActivity.this,Notes.class));
}
});
ImageButton accionentrar3 = (ImageButton)findViewById(R.id.imageButton2);
accionentrar3.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
startActivity(new Intent(MainActivity.this,Apunts.class));
}
});
ImageButton accionentrar4 = (ImageButton)findViewById(R.id.imageButton4);
accionentrar4.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
startActivity(new Intent(MainActivity.this,Altres.class));
}
});
}
}
Related
I'm new in java and I have tried to make a food app in android studio. I have a bar in app and when I click on cart my app is crashing.
Here is my MainActivity
public class MainActivity extends AppCompatActivity {
private RecyclerView.Adapter adapter, adapter2;
private RecyclerView recyclerViewCategotyList, recyclerViewPopularList;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
recyclerViewCategoty();
recyclerViewPopular();
bottomNavigation();
}
private void bottomNavigation() {
LinearLayout homeBtn=findViewById(R.id.homeBtn);
LinearLayout cartBtn=findViewById(R.id.cartBtn);
homeBtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
startActivity(new Intent(MainActivity.this,MainActivity.class));
}
});
cartBtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
startActivity(new Intent(MainActivity.this,CartActivity.class));
}
});
}
And I have this error: at com.example.food.Activity.MainActivity$2.onClick(MainActivity.java:48)
This is CartActivity
public class CartActivity extends AppCompatActivity {
private RecyclerView.Adapter adapter;
private RecyclerView recyclerViewList;
private ManagementCart managementCart;
private TextView totalFeeTxt, taxTxt, deliveryTxt, totalTxt, emptyTxt;
private double tax;
private ScrollView scrollView;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_cart);
managementCart = new ManagementCart(this);
initView();
initList();
bottomNavigation();
calculateCard();
}
private void bottomNavigation() {
LinearLayout homeBtn = findViewById(R.id.homeBtn);
LinearLayout cartBtn = findViewById(R.id.cartBtn);
homeBtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
startActivity(new Intent(CartActivity.this, MainActivity.class));
}
});
cartBtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
startActivity(new Intent(CartActivity.this, MainActivity.class));
}
});
}
I don't know what's wrong and why my setOnClickListener doesn't work.
Thank you.
I think your button R.id.homeBtn is not LinearLayout, can you show your xml file?
If your buttons are Button classes, try this
private void bottomNavigation() {
Button homeBtn = findViewById(R.id.homeBtn);
Button cartBtn = findViewById(R.id.cartBtn);
homeBtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
startActivity(new Intent(CartActivity.this, MainActivity.class));
}
});
cartBtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
startActivity(new Intent(CartActivity.this, MainActivity.class));
}
});
}
I have implemented two chronometers in a same activity and so far they are working fine. But when I change activities and then come back to them, they are at 00:00. I need them to keep counting "forever" until I hit the stop button. How can I do that?
And is it possible to make that counting appear also in another activity, so that I can follow up the counting in either activity? It has to be the same counting. Just two different places where I can follow the up from.
I tried a solution with onRestoreInstanceState but I am really confused. I am really new to coding and simple things are still frustrating to me. I am getting something wrong at the set.Base().
Chronometer cronometro_primeira_marca, cronometro_segunda_marca;
Button btn_iniciar_cronometro_primeira_marca, btn_parar_cronometro_primeira_marca, btn_resetar_cronometro_primeira_marca;
Button btn_iniciar_cronometro_segunda_marca, btn_parar_cronometro_segunda_marca, btn_resetar_cronometro_segunda_marca;
String timer1, timer2;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_cronometros);
cronometro_primeira_marca = (Chronometer) findViewById(R.id.cronometro_primeira_marca);
cronometro_segunda_marca = (Chronometer) findViewById(R.id.cronometro_segunda_marca);
btn_iniciar_cronometro_primeira_marca = (Button) findViewById(R.id.btn_iniciar_cronometro_primeira_marca);
btn_parar_cronometro_primeira_marca = (Button) findViewById(R.id.btn_parar_cronometro_primeira_marca);
btn_resetar_cronometro_primeira_marca = (Button) findViewById(R.id.btn_resetar_cronometro_primeira_marca);
btn_iniciar_cronometro_segunda_marca = (Button) findViewById(R.id.btn_iniciar_cronometro_segunda_marca);
btn_parar_cronometro_segunda_marca = (Button) findViewById(R.id.btn_parar_cronometro_segunda_marca);
btn_resetar_cronometro_segunda_marca = (Button) findViewById(R.id.btn_resetar_cronometro_segunda_marca);
btn_iniciar_cronometro_primeira_marca.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
cronometro_primeira_marca.setBase(SystemClock.elapsedRealtime());
cronometro_primeira_marca.start();
}
});
btn_iniciar_cronometro_segunda_marca.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
cronometro_segunda_marca.setBase(SystemClock.elapsedRealtime());
cronometro_segunda_marca.start();
}
});
btn_parar_cronometro_primeira_marca.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
cronometro_primeira_marca.stop();
}
});
btn_parar_cronometro_segunda_marca.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
cronometro_segunda_marca.stop();
}
});
btn_resetar_cronometro_primeira_marca.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
cronometro_primeira_marca.setBase(SystemClock.elapsedRealtime());
}
});
btn_resetar_cronometro_segunda_marca.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
cronometro_segunda_marca.setBase(SystemClock.elapsedRealtime());
}
});
}
#Override
protected void onSaveInstanceState(Bundle outState) {
outState.putLong("Restored_time1", SystemClock.elapsedRealtime());
super.onSaveInstanceState(outState);
}
#Override
protected void onRestoreInstanceState(Bundle savedInstanceState) {
if((savedInstanceState !=null)&& savedInstanceState.containsKey("Restored_time1")){
SystemClock.elapsedRealtime().**setBase**(savedInstanceState.getLong("Restored_time1"));
}
super.onRestoreInstanceState(savedInstanceState);
}
}
I want to develop an app to toggle the device's audio status. If the audio status is silent then my button's text should be "silent", if it's normal the text should be "normal"
Here is my only class:
public class MainActivity extends ActionBarActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final Button btn1= (Button) findViewById(R.id.btn1);
final AudioManager audio = (AudioManager)getSystemService(Context.AUDIO_SERVICE);
if (audio.getRingerMode()==AudioManager.RINGER_MODE_NORMAL)
{
btn1.setText("Normal");
}
else if (audio.getRingerMode()==AudioManager.RINGER_MODE_SILENT)
{
btn1.setText("Silent");
}
btn1.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
btn1.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
if (audio.getRingerMode()==AudioManager.RINGER_MODE_NORMAL)
{
audio.setRingerMode(AudioManager.RINGER_MODE_SILENT);
btn1.setText("Silent");
}
else if (audio.getRingerMode()==AudioManager.RINGER_MODE_SILENT)
{
audio.setRingerMode(AudioManager.RINGER_MODE_NORMAL);
btn1.setText("Normal");
}
}
});
}
});
How can I always check this condition in Android ?
If you need to get the mode of current ringer even if it was changed outside from you application context then you should register a BroadcastReceiver for AudioManager.RINGER_MODE_CHANGED_ACTION.
This receiver will be called everytime someone changes the ringer mode.
Do this inside onCreate.
BroadcastReceiver receiver=new BroadcastReceiver(){
#Override
public void onReceive(Context context, Intent intent) {
if (audio.getRingerMode()==AudioManager.RINGER_MODE_NORMAL)
{
btn1.setText("Silent");
}
else if (audio.getRingerMode()==AudioManager.RINGER_MODE_SILENT)
{
btn1.setText("Normal");
}
}
};
IntentFilter filter=new IntentFilter(AudioManager.RINGER_MODE_CHANGED_ACTION);
registerReceiver(receiver,filter);
Just do this
btn1.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
if (audio.getRingerMode()==AudioManager.RINGER_MODE_NORMAL)
{
audio.setRingerMode(AudioManager.RINGER_MODE_SILENT);
btn1.setText("Silent");
}
else if (audio.getRingerMode()==AudioManager.RINGER_MODE_SILENT)
{
audio.setRingerMode(AudioManager.RINGER_MODE_NORMAL);
btn1.setText("Normal");
}
}
});
what your are doing is
btn1.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
btn1.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
if (audio.getRingerMode()==AudioManager.RINGER_MODE_NORMAL)
{
audio.setRingerMode(AudioManager.RINGER_MODE_SILENT);
btn1.setText("Silent");
}
else if (audio.getRingerMode()==AudioManager.RINGER_MODE_SILENT)
{
audio.setRingerMode(AudioManager.RINGER_MODE_NORMAL);
btn1.setText("Normal");
}
}
});
}
});
I want to pass an XML resource from one activity to another activity using Java Code? I don't want to create separate different activities for different buttons.
ImageButton imageBttn = (ImageButton)findViewById(R.id.imageButton1);
imageBttn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
startActivity(new Intent(MainActivity.this, info.class));
}
});
Pseudocode to explain what I'm trying to do:
If BUTTON_1 is clicked
-Pass swirl.png to info.class
If BUTTON_2 is clicked
-Pass golden.png to info.class
If BUTTON_3 is clicked
-Pass arcade.png
imageBttn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent(MainActivity.this, info.class)
intent.putExtra("image",R.drawable.ic_search_grey);
startActivity(intent);
}
});
On Mainactvitiy get the int drawable
int res = getIntent().getIntExtra("image", -1);
if(res > -1) {
Drawable drawable = getResources().getDrawable(res, null);
imgBtn.setImageDrawable(drawable);
}
InfoActivity.java
public class InfoActivity extends Activity {
private static final String EXTRA_IMAGE = "image";
public static void launch(Activity activity, #DrawableRes int imageResId) {
Intent intent = new Intent(activity, InfoActivity.class);
intent.putExtra(EXTRA_IMAGE, imageResId);
activity.startActivity(intent);
}
#Override protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_info);
int imageResId = getIntent().getIntExtra(EXTRA_IMAGE, -1);
if (imageResId == -1) {
throw new IllegalArgumentException(EXTRA_IMAGE);
// or set error/default image resource id
}
// ... something to do with imageResId
}
}
MainActivity.java
button1.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
InfoActivity.launch(MainActivity.this, R.drawable.swirl);
}
});
button2.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
InfoActivity.launch(MainActivity.this, R.drawable.golden);
}
});
button3.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
InfoActivity.launch(MainActivity.this, R.drawable.arcade);
}
});
}
I'm trying to switch the views, but when I'm in the second view, the back event click doesnt work.. I don't know what's wrong.
Pls, see my code and help me!
Part1
Part2
public class t extends Activity implements OnClickListener {
Button volta;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.janela2);
volta = (Button) findViewById(R.id.button2);
volta.setOnClickListener(this);
}
#Override
public void onClick(View v) {
if (v == volta) {
startActivity(new Intent(t.this, MainActivity.class));
}
}
}
You have to override onBackPressed. Change your MainActivity as below
public class MainActivity extends Activity {
private boolean goBack = false;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button sobre = (Button) findViewById(R.id.button1);
sobre.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
goBack = true;
setContentView(R.layout.janela2);
}
});
}
#Override
public void onBackPressed() {
//If you have switched to R.layout.janela2 then go back
if (goBack){
setContentView(R.layout.activity_main);
goBack = false;
return;
}
//else do default action
super.onBackPressed();
}
}
Just do the following code, I hope it might help you
MainActivity.java
public class MainActivity extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button sobre = (Button) findViewById(R.id.button1);
sobre.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
Intent intent = new Intent(MainActivity.this, t.class);
startActivity(intent);
}
});
}
}
In t.java
public class t extends Activity{
Button volta;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.janela2);
}
#Override
public void onStop() {
super.onStop();
finish();
}
}
If you want two layouts then use viewflipper. If you want two activities (java classes) AND two layouts separately then use:
Intent i = new Intent (this, myClass.class);
startActivity(i);
To start the Activity and NOT setcontentview
So here:
public void onClick(View v) {
startActivity(new Intent (MainActivity.this, t.class));
OR IN THE CASE OF T.CLASS:
startActivity(new Intent (t.this, MainActivity.class));
}
You have to override onBackPressed() method if you want to back button functionality in your application. i.e.
public void onBackPressed() {
Intent start = new Intent(CurrentClass.this,Next_Activity.class);
startActivity(start);
finishActivity(0);
}