I am making a simple calculator and for the -/+ button i write the code bellow:
float ab=-1;
this.txtScreen = (EditText) findViewById(R.id.txtScreen);
unary=(Button)findViewById(R.id.plusminus);
mod=(Button)findViewById(R.id.modul);
unary.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
txtScreen.setText(ab*txtScreen);
}
});
and showing me error * operator cannot applied to float.
Try this (it needs string):
float ab=-1;
unary=(Button)findViewById(R.id.plusminus);
mod=(Button)findViewById(R.id.modul);
unary.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
txtScreen.setText(String.valueOf(ab * Float.valueOf(txtScreen.getText().toString())));
}
});
Edit: Getting the value from the txtScreen in calculation.
Do like this
float ab=-1;
unary=(Button)findViewById(R.id.plusminus);
mod=(Button)findViewById(R.id.modul);
unary.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
txtScreen.setText(String.valueOf(ab*Float.parseFloat(txtScreen.getText().toString())));
}
});
Related
I am new to android. I have five buttons on an activity and on every button click i want to save data shown/written on button say "10",on other button "20" etc.into arraylist or list and than add(+) them every time any button is clicked and than store them on single value and when sublit button is clicked than the total single value is saved into firebase database as signle child data.
Hope this will working for you.
ArrayList<Integer> total = new ArrayList();
int totalCount = 0;
button10.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View view) {
total.add(10);
}
});
button20.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View view) {
total.add(20);
}
});
button50.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View view) {
total.add(50);
}
});
button100.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View view) {
total.add(100);
}
});
button500.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View view) {
total.add(500);
}
});
button1000.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View view) {
total.add(1000);
}
});
submitButton.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View view) {
for(int i = 0; i < total.size();i++){
totalCount = totalCount + total.get(i); //total value or Output
}
}
});
currently my code is quite a bit of redundant code as below:
iv_11.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
int theCard = Integer.parseInt((String) view.getTag());
doStuff(iv_11, theCard);
}
});
iv_12.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
int theCard = Integer.parseInt((String) view.getTag());
doStuff(iv_12, theCard);
}
});
iv_13.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
int theCard = Integer.parseInt((String) view.getTag());
doStuff(iv_13, theCard);
}
});
iv_14.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
int theCard = Integer.parseInt((String) view.getTag());
doStuff(iv_14, theCard);
}
});
so, I have decided to implements View.OnClickListener to make it same thing dynamic and so in my class, i implements View.OnClickListener and then i replace the above code with below:
iv_11.setOnClickListener(this);
iv_12.setOnClickListener(this);
iv_13.setOnClickListener(this);
iv_14.setOnClickListener(this);
and finally, I add this below code:
public void onClick(View v) {
int theCard = Integer.parseInt((String) v.getTag());
doStuff(?, theCard);
}
Problem is what should I put in the question mark above?
doStuff method should be invoked as following code.
doStuff((ImageView)v, theCard);
pass the view argument as
doStuff(v, theCard);
I want to do different things for one button.
But I am changing instructions after the button was clicked every time.
First I am creating two buttons, after I clicked the button I want it to change its text. For each text I want to create different instruction.
I created an if/else for this. But I am not sure why my isn’t not working.
I only do instructions in the first statement.
Here is my code.
package com.example.iqbal.destini;
public class MAINPAGE extends AppCompatActivity {
Button mAnswer_1_Button;
Button mAnswer_2_Button;
TextView mTextbody;
int counter1 = 0;
int counter2 = 0;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_mainpage);
mAnswer_1_Button = (Button) findViewById(R.id.answer_1);
mAnswer_2_Button = (Button) findViewById(R.id.answer_2);
mTextbody = (TextView) findViewById(R.id.text_body);
if(mTextbody.getText().toString().equals(getResources().getString(R.string.T1_Story)) && mAnswer_2_Button.getText().toString().equals(getResources().getString(R.string.T1_Ans2))&&mAnswer_1_Button.getText().toString().equals(getResources().getString(R.string.T1_Ans1)) ){
mAnswer_1_Button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
mTextbody.setText(R.string.T3_Story);
mAnswer_1_Button.setText(R.string.T3_Ans1);
mAnswer_2_Button.setText(R.string.T3_Ans2);
}
});
mAnswer_2_Button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
mTextbody.setText(R.string.T2_Story);
mAnswer_1_Button.setText(R.string.T2_Ans1);
mAnswer_2_Button.setText(R.string.T2_Ans2);
}
});
}
else if(mTextbody.getText().toString().equals(getResources().getString(R.string.T2_Story))&& mAnswer_2_Button.getText().toString().equals(getResources().getString(R.string.T2_Ans2))&&mAnswer_1_Button.getText().toString().equals(getResources().getString(R.string.T2_Ans1))){
mAnswer_1_Button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
mTextbody.setText(R.string.T3_Story);
mAnswer_1_Button.setText(R.string.T3_Ans1);
mAnswer_2_Button.setText(R.string.T3_Ans2);
}
});
mAnswer_2_Button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
mTextbody.setText(R.string.T4_End);
mAnswer_1_Button.setVisibility(View.GONE);
mAnswer_2_Button.setVisibility(View.GONE);
}
});
}
else if(mTextbody.getText().toString().equals(getResources().getString(R.string.T3_Story))&& mAnswer_2_Button.getText().toString().equals(getResources().getString(R.string.T3_Ans2))&&mAnswer_1_Button.getText().toString().equals(getResources().getString(R.string.T3_Ans1))){
mAnswer_1_Button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
mTextbody.setText(R.string.T6_End);
mAnswer_1_Button.setVisibility(View.GONE);
mAnswer_2_Button.setVisibility(View.GONE);
}
});
**mAnswer_2_Button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
mTextbody.setText(R.string.T5_End);
mAnswer_1_Button.setVisibility(View.GONE);
mAnswer_2_Button.setVisibility(View.GONE);
}
});
}
}
}**
mTextbody.getText() always is empty where it's currently located (unless you have a default string in the TextView)
Move the if conditions into the onClick method body.
Conditionally perform the action. Don't conditionally add the listener.
And you only need one OnClickListener per button
In my application, I have two buttons. I am taking an input and based on which button is clicked, displaying an output. However, for this, I have to write input and output statements in each of the button's OnClickListener(). This is making the code bulky. Is there any way by which I can write common input and output statements.
My current code looks something like this.
Button1.setOnClickListener(new View.onClickListener() {
public void onClick(View arg0) {
input();
process1();
output();
}
});
Button2.setOnClickListener(new View.onClickListener() {
public void onClick(View arg1) {
input();
process2();
output();
}
});
I want my code to be something like this:
input();
Button1.setOnClickListener(new View.onClickListener() {
public void onClick(View arg0) {
process1();
}
});
Button2.setOnClickListener(new View.onClickListener() {
public void onClick(View arg1) {
process2();
}
});
output();
Is this possible ? If yes then how ? If no then why ?
Thank You !
Edit:
input() is: input = Double.parseDouble(inputString.getText().toString());
output() is: outputString.setText(String.valueOf(output));
input and output are double and defined already.
output is calculated from input by simple arithmetic process1() and process2().
inputString is EditText and outputString is TextView.
Not sure if it's worth the trouble, but you could create an abstract class BaseListener that implements OnClickListener. Its onClick method would look like this :
public void onClick(View arg1)
{
input();
process();
output();
}
process() would be an abstract method.
Each Button would have a listener that extends BaseListener and implements process().
For example :
Button1.setOnClickListener(new BaseListener () {
protected void process() {
process1();
}
});
Is not the best way, but you can extract a method:
void process(int btn) {
input();
if(btn == 1) process1();
else if (btn == 2) process2();
output();
}
And call it this way:
Button1.setOnClickListener(new View.onClickListener() {
public void onClick(View arg0) {
process(1);
}
});
Button2.setOnClickListener(new View.onClickListener() {
public void onClick(View arg1) {
process(2);
}
});
This can be done in many ways...on way is like this.
Button1.setOnClickListener(onClickListener);
Button2.setOnClickListener(onClickListener);
View.OnClickListener onClickListener = new OnClickListener() {
#Override
public void onClick(View view) {
input();
switch (view.getId()) {
case R.id.button1:
process1();
output();
break;
case R.id.button2:
process2();
break;
}
output();
}
};
I have an activity with custom popup window (quickaction style). There are some buttons leading to other activities. I want to close popup after pressing button (about or email button) in this popup (now when I go back popup appears again).
public class FirstActivity extends Activity implements OnClickListener {
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// some code
Button quickButton = (Button) findViewById(R.id.button_quickaction);
quickButton.setOnClickListener(this);
final ActionItem about = new ActionItem();
final ActionItem email = new ActionItem();
quickButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
QuickAction qa = new QuickAction(v);
qa.addActionItem(about);
qa.addActionItem(email);
qa.setAnimStyle(QuickAction.ANIM_GROW_FROM_RIGHT);
qa.show();
}
});
about.setTitle("About");
about.setIcon(getResources().getDrawable(R.drawable.about));
about.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
//some code
}
});
email.setTitle("Email");
email.setIcon(getResources().getDrawable(R.drawable.email));
email.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
//some code
}
});
}
}
Please, help.
Added:
I need something like this:
about.setTitle("About");
about.setIcon(getResources().getDrawable(R.drawable.about));
about.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
qa.dismiss();
}
});
But qa cannot be resolved. Even if I add final to QuickAction qa = new QuickAction(v);.
try finish() on button's onClick method.
updated:
QuickAction qa;
quickButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
qa = new QuickAction(v);
qa.addActionItem(about);
qa.addActionItem(email);
qa.setAnimStyle(QuickAction.ANIM_GROW_FROM_RIGHT);
qa.show();
}
});
about.setTitle("About");
about.setIcon(getResources().getDrawable(R.drawable.about));
about.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
if(qa.isShowing())
qa.dismiss();
//some code
}
});
email.setTitle("Email");
email.setIcon(getResources().getDrawable(R.drawable.email));
email.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
if(qa.isShowing())
qa.dismiss();
//some code
}
});
you can also put private QuickAction qa; at your activity.