I read some example on this website and other but still have error.
It's not a compilation error but my application crash when I click on the button.
There is code of my MainActivity.java (only interesting part) :
public class MainActivity extends AppCompatActivity implements View.OnClickListener{
//blablabla
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
this.myLayout= (LinearLayout) findViewById(R.id.layoutProp);
Button button = (Button) findViewById(R.id.buttonValider);
button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
openActivity2();
}
});
}
public void openActivity2() {
Intent intent = new Intent(this, Activity2.class);
intent.putExtra(EXTRA_TEXT, text); // this one does not work
intent.putExtra(EXTRA_NUMBER, nbTextView);
startActivity(intent);
}
}
And code in Activity2.java
public class Activity2 extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_2);
Intent intent = getIntent();
int nbTextView = intent.getIntExtra(MainActivity.EXTRA_NUMBER, 0);
MyTextView[] text = (MyTextView[]) intent.getSerializableExtra(MainActivity.EXTRA_TEXT);
TextView textView1 = (TextView) findViewById(R.id.TVtest);
textView1.setText(""+ nbTextView);
} }
if I comment : MyTextView[] text =(MyTextView[])intent.getSerializableExtra(MainActivity.EXTRA_TEXT);
the application does not crash.
Thank you all very much for your help
You cannot pass views through intents. Views are part of the layout and cannot be shared between activities.
If you want to pass array with custom objects you must implement a Parcelable or Serializable class and use:
getIntent().getParcelableExtra("array");
or
getIntent().getSerializableExtra("array");
Parcelable class will be faster but it is harder to implement.
Another way is to use a library like Gson to parse your data to Json and pass it as a string.
Related
I've got little problem with implementing asynctask for my class project.
"PART_OF_URL?title="+tytul+"&author="+autor+"&date="+dataSt+"&username="+imieSt
so this is whole string that should be executed, it works "perfectly" fine like this:
Intent i = new Intent(Intent.ACTION_VIEW);
i.setData(Uri.parse("PART_OF_URL?title="+tytul+"&author="+autor+"&date="+dataSt+"&username="+imieSt));
startActivity(i);
Which sends data to PART_OF_URL website that display order list
but instead of that it should be done in asynctask.
Here is whole activity code that handle sending data:
public class Zamowienie extends AppCompatActivity {
TextView tytulzamowieniaTV;
EditText data;
EditText imie;
Button zamawiaj;
Button anuluj;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_zamowienie);
tytulzamowieniaTV=findViewById(R.id.tytulZamwowienia);
data=findViewById(R.id.data);
imie=findViewById(R.id.imie);
zamawiaj=findViewById(R.id.zamawiaj);
anuluj=findViewById(R.id.anuluj);
tytulzamowieniaTV.setText(getIntent().getStringExtra("Tytul"));
String tytul=getIntent().getStringExtra("Tytul");
String autor=getIntent().getStringExtra("Autor");
wyslijZamowienie(tytul,autor);
}
public void wyslijZamowienie(String tytul,String autor){
zamawiaj.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
String dataSt=data.getText().toString();
String imieSt=imie.getText().toString();
Intent i = new Intent(Intent.ACTION_VIEW);
i.setData(Uri.parse("PART_OF_URL?title="+tytul+"&author="+autor+"&date="+dataSt+"&username="+imieSt));
startActivity(i);
}
});
}
}
Understanding asynctask is problematic for me so any help is appreciated.
ANSWERED
I am trying to send and int to another activity.There is a button in first act. and it opens second act. and takes int from here to other page.But i cant start two of them at one time.
Here is my first activity :
public class ana_ekran extends AppCompatActivity {
public TextView ana_ekran_kule;
public TextView ana_ekran_can;
public int ana_ekran_can_int=30;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_ana_ekran);
ana_ekran_kule=(TextView) findViewById(R.id.textView);
ana_ekran_can=(TextView) findViewById(R.id.textView2);
ana_ekran_can.setText(ana_ekran_can_int+" CAN");
}
public void devam (View v){
Intent i = new Intent(getApplicationContext(),fight_1.class);
i.putExtra("deger", ana_ekran_can_int);
startActivity(i);
startActivity(new Intent(this,fight_1.class));
}
}
and this is second:
public class fight_1 extends AppCompatActivity {
public TextView fight_1_can;
public int fight_1_can_int;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_fight_1);
fight_1_can=(TextView) findViewById(R.id.textView3);
int i = getIntent().getIntExtra("deger",-1);
fight_1_can_int=i;
fight_1_can.setText(fight_1_can_int+"");
}
}
This startActivity(i); will do the same thing as next line but it will carry the data as well whereas startActivity(new Intent(this,fight_1.class)); will only start the other instance of fight_1 activity so
public void devam (View v){
Intent i = new Intent(getApplicationContext(),fight_1.class);
i.putExtra("deger", ana_ekran_can_int);
startActivity(i);
// start fight_1 again without any data so not required
//startActivity(new Intent(this,fight_1.class));
}
What is the problem with my code :(
This is the sending class:
public class Send extends AppCompatActivity {
String message_text;
final static String MSG_KEY = "this.is.the.message";
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.send_layout);
}
public void sendMessage(View view) {
EditText entryText = (EditText)findViewById(R.id.message_text);
message_text = entryText.getText().toString();
Intent intent = new Intent(this, MainActivity.class);
intent.putExtra(message_text, MSG_KEY);
startActivity(intent);
}
}
this is the receiver:
public class MainActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
TextView theMessage = (TextView)findViewById(R.id.theMessage);
theMessage.setText(getIntent().getStringExtra("this.is.the.message"));
}
}
the app starts but it does not pass text, just an empty recieving activity ???
intent.putExtra(message_text, MSG_KEY);
replace with
intent.putExtra(MSG_KEY, message_text);
Frist argument is NAME , second argument - VALUE
You are using value as key and key as value which is causing this issue.
Change
intent.putExtra(message_text, MSG_KEY);
to
intent.putExtra(MSG_KEY, message_text);
If changing intent.putExtra(MSG_KEY, message_text); doesn't fix the issue. Check AndroidManifest.xml to make sure that MainActivity is not the launcher otherwise your MainActivity starts before the send class.
I don't know why, but this isn't working. Can anyone see anything wrong with my code.
I have two activities and I'm passing data from two
public class InputActivity extends AppCompatActivity {
EditText number1EditText;
EditText number2EditText;
Button addButton;
InputActivity code looks like this
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_input);
number1EditText = (EditText)findViewById(R.id.editText);
number2EditText = (EditText)findViewById(R.id.editText2);
addButton = (Button)findViewById(R.id.button);
addButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent mIntent = new Intent(getApplicationContext(), AddActivity.class);
mIntent.putExtra("number1", number1EditText.getText().toString());
mIntent.putExtra("number2", number2EditText.getText().toString());
startActivity(mIntent);
}
});
}
AddActivity code looks like this
public class AddActivity extends AppCompatActivity {
TextView answer;
double y=0;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_add);
answer =(TextView)findViewById(R.id.textView);
String value1 = getIntent().getExtras().getString("number1");
String value2 = getIntent().getExtras().getString("number2");
answer.setText((int) (Double.parseDouble(value1)+Double.parseDouble(value2)));
}
Just looking quickly:
answer.setText((int) (Double.parseDouble(value1)+Double.parseDouble(value2)));
You're passing a int to the method setText() which happens to have an overload that receives a int argument for the cases when you pass the reference from a String in some xml. You may be getting a ResourceNotFoundException.
If you want to show a text with the sum between your values:
answer.setText(String.valueOf((int) (Double.parseDouble(value1)+Double.parseDouble(value2))));
Just keep in mind that there are a lot of checks you have to do first, you may get another exceptions doing this kind of parse, like NumberFormatException for instance.
i got 2 java files app.java and gallaery.java
App.java
public class App extends Activity implements OnClickListener {
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Button Listvideo = (Button) findViewById(R.id.Listvideo);
Listvideo.setOnClickListener(this);
public void onClick(View view) {
if (view == findViewById(R.id.Listvideo)) {
// i have to call gallery.java here which executes list of images in the android pone
}
}
Assuming Gallery.java also extends Activity you should call:
Intent mIntent = new Intent(this, Gallery.class);
startActivity(mIntent);