Develop Reference

Perform action only if two buttons are clicked

This is the first time I'm ever dabbling in Android development so please bear with me.
My requirement is this:
I have two buttons on screen, A and B. If the user presses both buttons (order doesn't matter), I need another page to be displayed. Pressing either A or B should do nothing.
Is this possible? If so, how would I achieve this?
Thank you.

This is possible if you take a flag. (boolean)
You should set a flag in your button listeners.
public class Mtest extends Activity {
Button b1;
Button b2;
boolean flag_1 = false;
boolean flag_2 = false;
public void onCreate(Bundle savedInstanceState) {
...
b1 = (Button) findViewById(R.id.b1);
b2 = (Button) findViewById(R.id.b2);
b1.setOnClickListener(myhandler1);
b2.setOnClickListener(myhandler2);
}
View.OnClickListener myhandler1 = new View.OnClickListener() {
public void onClick(View v) {
// it was the 1st button
flag_1 = true;
doSomething();
}
};
View.OnClickListener myhandler2 = new View.OnClickListener() {
public void onClick(View v) {
// it was the 2nd button
flag_2 = true;
doSomething();
}
};
}
public void doSomething(){
if(flag_1 && flag_2)
{
//DO SOMETHING
}
}
}

Create two boolean's like button1isClickedand button2isClicked,then set an onClickListener for each Button. When the the Button is clicked set the value of these two boolean's to true, then simply create an if() statement that will chekc to see if both buttons have been clicked, like this:
if(button1isClicked == true && button2isClicked == true){
//display your new page
}

android clear ediitext in onclicklistener

I have one edittext. First time my edittext's settext is 1 and I want to clear this text in editttext click and input new keyboard values
I wrote code but not working
price_counter = (EditText) rootView
.findViewById(R.id.strada_price_counter);
price_counter.setText("1");
price_counter.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
price_counter.setText("");
}
});
<EditText
android:id="#+id/strada_price_counter"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="#+id/strada_buy_btn"
android:layout_marginLeft="18dp"
android:layout_toRightOf="#+id/strada_buy_btn"
android:background="#drawable/input_value"
android:gravity="center"
android:inputType="number">
</EditText>
this code not working if anyone knows solution please help me

You are not supposed to call setOnClickListener on EditText. Register click listener for a button and call settext for EditText on button click.

Update your code to the following:
price_counter.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
((EditText)v).setText("");
}
});

Try this code... This might be you are looking for
public class MainActivity extends Activity implements OnTouchListener
{
EditText et;
#Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
et=(EditText)findViewById(R.id.editText1);
et.setText("1");
et.setOnTouchListener(this);
}
#Override
public boolean onTouch(View v, MotionEvent event)
{
// TODO Auto-generated method stub
if(event.getAction() == MotionEvent.ACTION_DOWN)
{
et.setText("");
}
return false;
}
}

Android - How to increase EditText value?

I'm new to android development..
I have this code in my main class:
Button prevBtn, pauseBtn, nextBtn;
EditText counterTxt;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_affirmations);
SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this);
prevBtn = (Button)findViewById(R.id.prevBtn);
pauseBtn = (Button)findViewById(R.id.pauseBtn);
nextBtn = (Button)findViewById(R.id.nextBtn);
counterTxt = (EditText)findViewById(R.id.counterTxt);
prevBtn.setOnClickListener(new View.OnClickListener() {
int t = Integer.parseInt(counterTxt.getText().toString());
public void onClick(View v) {
counterTxt.setText(String.valueOf(t-1));
}
});
nextBtn.setOnClickListener(new View.OnClickListener() {
int t = Integer.parseInt(counterTxt.getText().toString());
public void onClick(View v) {
counterTxt.setText(String.valueOf(t+1));
}
});
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.activity_affirmations, menu);
return true;
}
When I click "Previous", the text field value becomes 19.
When I click "Next", the text field value becomes 21.
But it only displays these two values, nothing else, no matter if i click again. I want to subtract or add 1 whenever i click the appropriate buttons.
I think this happens because the event Listeners are inside onCreate() method? Any idea on how to make it update each time I click?

You need to move your parseInt inside your onClick:
nextBtn.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
int t = Integer.parseInt(counterTxt.getText().toString());
counterTxt.setText(String.valueOf(t+1));
}
});

In both cases, t is defined as a member variable of the listener, and never changed. move it inside the onClick method instead, like this (in both cases):
public void onClick(View v) {
int t = Integer.parseInt(counterTxt.getText().toString());
counterTxt.setText(String.valueOf(t-1));
}

One button used for two Action

Can any one tell me? how can i use the same button for two Action?
Like em using one button in my activity that calculate some values and after calculating the when i again press same button then reset the all fields. Like in this Application
http://www.craziness.com/games/play-love-tester/ when i test the love by pressing the button
then i again press the same button then all fields reset.
what should i use in my activity for the above problem?

You can create a global variable which indicates the state of the program and then change this value when needed. In the OnClickListener of your Button you create an if statement which checks this variable and does the needed things for the associated value.
Example:
public class MainActivity extends Activity {
private int state = 0;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Button button = (Button) findViewById(R.id.button);
button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
if (state == 0) {
// State 1
}
else if (state == 1) {
// State 2
}
else {
// Default state
}
}
});
// Rest of your code including state changing part
}
}

You can do it by changing the button text.
If you do not want that someone sees the text change. Test (example "click" and the other state "click " (1 blank at the end) or another solution.
....
Button bt = (Button) findViewById(R.id.button);
bt.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
// todo: check for expected instance (Button)
Button btc = (Button)v;
String bText = btc.getText().toString();
if (bText == "open") {
btc.setText("close");
}
else if (bText == "close") {
btc.setText("open");
}
}
[...]

You can do so by using a toggle button.
In your xml file add a toggle button
<ToggleButton
android:id="#+id/tbtn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text=""
android:textOff="Reset"
android:textOn="Calculation"
android:background="#drawable/icon"/>
Java file
public class Reviews extends Activity implements OnClickListener {
private ToggleButton tbtn;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
tbtn = (ToggleButton) findViewById(R.id.tbtn);
tbtn.setOnClickListener(this);
public void onClick(View view) {
if (tbtn.isChecked()) {
//calculate the result
}
else {
//Reset your global calculation variable;
}
}
}
}

How to toggle background image on button click?

I have this code:
button1.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
button1.setBackgroundResource(R.drawable.detailpressed);
Chapter_sync.add(chapid);
}
What I am trying to do is toggle all the methods called in the following clicklistener.
Eg first time when I Click this button the setBackgroundResource(R.drawable.detailpressed) is called and on the next click same metod is called with different drawable.
Something like toggle button.
Someone good at this plz help?

you can take a variable
int i=0;
it will increase with every click.
if(i%2==0)
set one image
else
set another image

How about creating an array of the drawable's IDs and saving an index:
private final int[] myDrawables = {R.drawable.detailpressed, R.drawable.detailpressed1, ...};
//...
button1.setOnClickListener(new OnClickListener() {
int index = 0;
#Override
public void onClick(View v) {
button1.setBackgroundResource(myDrawables[index++ % myDrawables.length]);
Chapter_sync.add(chapid);
}
}

declare variable as
boolean isOddClicked = true;
And update your click listener as
button1.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
//Do stuff here for chnaging background of button
if(isOddClicked) {
button1.setBackgroundResource(R.drawable.detailpressed);
isOddClicked = false;
} else {
button1.setBackgroundResource(R.drawable.detailpressed_SECOND_IMAGE);
isOddClicked = true;
}
//Do your task
Chapter_sync.add(chapid);
}
NOTE: If your requirement moves between two images then you can use toggle button and customize it. It will work for same as your requirement.

if xml as the following
<code>
<Button
android:id="#+id/btnListView"
android:layout_width="35dp"
android:layout_height="35dp"
android:background="#drawable/list_view"
android:onClick="switchToListView"
android:visibility="visible"
/>
<Button
android:id="#+id/btnGridView"
android:layout_width="35dp"
android:layout_height="35dp"
android:background="#drawable/grid_view"
android:onClick="switchToGridView"
android:visibility="gone"
/>
<code>
handling Code will be like
<code>
public void switchToListView(View view) {
(Button) findViewById(R.id.btnListView).setVisibility(View.GONE);
(Button) findViewById(R.id.btnGridView).setVisibility(View.VISIBLE);
}
public void switchToGridView(View view) {
(Button) findViewById(R.id.btnGridView).setVisibility(View.GONE);
(Button) findViewById(R.id.btnListView).setVisibility(View.VISIBLE);
}
</code>