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));
}
Related
no button feedback in android studio, i just want to guide from one activity to another! :(
no errors
here's the code
public abstract class OrderActivity extends AppCompatActivity {
private Button clickButton;
#Override
protected void onCreate(Bundle savedInstanceState) {
clickButton =(Button) findViewById(R.id.IDbutton2);
clickButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
openActivity();
}
});
}
public void openActivity(){
Intent intent = new Intent(OrderActivity.this, orderPage.class);
startActivity(intent);
}
}
using nexus 6 emulator
please help guys
You haven't set a content view, so your OrderActivity has no layout. As such, there is no view with ID IDbutton2. This causes clickButton to be null, and not do anything.
You can see a very similar example in the Android training (I've removed the irrelevant bits):
public class MainActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
public void sendMessage(View view) {
Intent intent = new Intent(this, DisplayMessageActivity.class);
startActivity(intent);
}
}
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.
I have three activities A.B and C. I have a button in activity C. My requirement is that the button should only visible when going from activity B to C. The button should be invisble when going from A to C. Please help me.
Activity A
public class A extends AppCompatActivity {
Button button;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.yourLayout);
// TODO: 5/5/2018 consider findViewById
button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent(A.this, C.class);
intent.putExtra(KEY_EXTRA, FROM_A);
startActivity(intent);
}
});
}
}
Activity B
public class B extends AppCompatActivity {
Button button;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.yourLayout);
// TODO: 5/5/2018 consider findViewById
button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent(B.this, C.class);
intent.putExtra(KEY_EXTRA, FROM_B);
startActivity(intent);
}
});
}
}
Activity C
public class C extends AppCompatActivity {
Button button;
public static int FROM_A = 1;
public static int FROM_B = 2;
public static String KEY_EXTRA = "KEY_EXTRA";
int activityStartedFrom;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.yourLayout);
// TODO: 5/5/2018 consider findViewById
activityStartedFrom = getIntent().getIntExtra(KEY_EXTRA, FROM_B);
button.setVisibility(activityStartedFrom == FROM_B ? View.VISIBLE : View.GONE);
}
}
I am trying to send data through an activity to another but there is a variable error that I didn't understand, please Help. Thank you very much for your time and assistance in this matter.
public class MainActivity extends AppCompatActivity {
EditText Message_Text;
public final static String MESSAGE_KEY="com.example.zeeshan.userinterface.message_key";
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
public void sendMessage(View views) {
Message_Text= (EditText) findViewById(R.id.Message_Text);
String message=Message_Text.getText().toString();
Intent intent= new Intent(this, SecondActivity.class);
intent.putExtra(MESSAGE_KEY,message);
startActivity(intent);
}
}
the second activity code is:
public class SecondActivity extends AppCompatActivity {
public final static String MESSAGE_KEY="com.example.zeeshan.userinterface.message_key";
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Intent intent= getIntent();
String message = intent.getStringExtra(MESSAGE_KEY);
TextView textView = new TextView(this);
textView.setTextSize(35);
// setContentView(R.layout.second_layout);
}
}
you have to write like below.
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
sendMessage();
}
public void sendMessage() {
EditText Message_Text= (EditText) findViewById(R.id.Message_Text);
String message=Message_Text.getText().toString();
Intent intent= new Intent(this, SecondActivity.class);
intent.putExtra("MESSAGE_KEY",message);
startActivity(intent);
}
I have a grand parent activity called Department
public class Department extends AppCompatActivity {
RecyclerView recyclerView;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_department);
.........
itemView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Context context = v.getContext();
Intent intent = new Intent(context, DeptDetail.class);
Bundle extra = new Bundle();
extra.putString("Department", getAdapterPosition()+"");
intent.putExtras(extra);
context.startActivity(intent);
}
});
}
}
Sends data about Department position to DepartmentDeatail activity
public class DeptDetail extends AppCompatActivity implements View.OnClickListener{
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_dept_detail);
Bundle extra = getIntent().getExtras();
deptpos = Integer.parseInt(extra.getString("Department"));
.........
public void onClick(View v) {
int id= v.getId();
Intent in;
Bundle extras = new Bundle();
in = new Intent(DeptDetail.this, Mission.class);
extras.putString("Mission",mission[deptpos]);
extras.putString("Deptid", deptpos+"");
in.putExtras(extras);
startActivityForResult(in,1);
}
}
and DeptDetail activity sends same Deptpos to its child activity Mission
public class Mission extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_mission);
Bundle extra = getIntent().getExtras();
String mission = extra.getString("Mission");
deptid=Integer.parseInt(extra.getString("Deptid"));
TextView txtmission = (TextView)findViewById(R.id.txtmission);
try {
txtmission.setText(mission);
}
catch (NullPointerException e)
{
txtmission.setText("");
}
}
}
And now I want same Deptid to be accessed in DeptDetail activity which always calls for intent from Department activity, which is not available as usual..
So please show me the way to pass the data to child and back to parent.
I tried
onActivityResult(..)
but it wasn't called before onCreate where extra is read and generating NullPointerException