I am having a button in my activity and using a TranslateAnimation to change its position.
I am using anim.setFillAfter(true); to keep the resulting translation, the button shifts its position but the touch area remains same. Now when i touch on the button it doesn't work rather touching on the previous location of the button calls its listener..
Here is my code:
MainActivity.java
public class MainActivity extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Animation anim=new TranslateAnimation(0, 100, 0, 0);
anim.setDuration(500);
anim.setFillAfter(true);
Button mybtn = (Button)findViewById(R.id.btn);
mybtn.startAnimation(anim);
}
public void myFunc(View v){
Toast.makeText(this, "btn clicked", Toast.LENGTH_SHORT).show();
}
}
activity_main.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity" >
<Button
android:id="#+id/btn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:text="#string/hello_world"
android:onClick="myFunc"/>
</RelativeLayout>
I found the answer to my query at this page
vogella
and here android has explained it, buttons require a property animation not just the view animation:
Here is the code that I used:
Button mybtn = (Button)findViewById(R.id.btn);
mybtn.animate().translationX(400).setDuration(500);
Thanx for your help...
I am leaving this post if anyone else require assistance.
I have re-generated your case and it seems like only 50% of the button shows the selected color. Is that right ? Try this :
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button sampleButton = (Button)findViewById(R.id.btn);
sampleButton.animate().translationX(somevalue).setDuration(someduration);
}
Related
I'm trying to resize ImageView on button click. I don't know why but setLayoutParams works when I call it in onCreate method, but not working when use it inside button's OnClickListener. Did I miss something?
ImageView myImageView;
Button myButton;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_result);
myImageView = findViewById(R.id.viewtest);
myButton = (Button)findViewById(R.id.buttontest);
resizeImageView(); // resize when called here
myButton.setOnClickListener(new Button.OnClickListener() {
#Override
public void onClick(View v) {
resizeImageView(); // NOT resize when called here
}
});
}
private void resizeImageView() {
Toast.makeText(getApplicationContext(), "Resize", Toast.LENGTH_LONG).show();
LinearLayout.LayoutParams params = (LinearLayout.LayoutParams)myImageView.getLayoutParams();
params.height = 300;
params.width = 300;
myImageView.setLayoutParams(params);
}
XML layout. I'm using LinearLayout inside of RelativeLayout.
<?xml version="1.0" encoding="utf-8"?>
<android.widget.RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".ResultActivity">
<android.widget.LinearLayout
android:id="#+id/lineartest"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
>
<ImageView
android:id="#+id/viewtest"
android:layout_width="50dp"
android:layout_height="50dp"
android:scaleType="centerCrop"
android:layout_centerVertical="true"
app:srcCompat="#mipmap/ic_launcher_round"
android:background="#444"
/>
</android.widget.LinearLayout>
<android.support.v7.widget.AppCompatButton
android:id="#+id/buttontest"
android:layout_width="match_parent"
android:layout_height="100dp"
android:text="test"/>
</android.widget.RelativeLayout>
I just checked. This works fine in case of ImageView.
Maybe you are resizing it multiple times. Means If you have already called resresizeImageView() in onCreate method and you call it again in OnClick method , the resizing won't be visible because it already has the size you are resizing to.
In xml, you have AppCompatButton but in java you have defined as Button. Change AppCompatButton to Button in xml Or in java, Button to AppCompatButton.
I used your code, to create a new project, and just commented out the first call to resizeImageView() and it works fine when resizeImageView() is called in onClick()
As Derek answered, maybe you're already setting the same bounds to the ImageView during onCreate() which you wish to update in button click.
Also, just a suggestion:
Try adding the property android:layout_below="#id/lineartest" to your AppCompatButton.
Change android:layout_height="wrap_content", so you can view the changes happening to the ImageView.
Try this one
public class SomeActivity extends Activity {
public static final float screenWidth;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.the_company);
DisplayMetrics metrics = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(metrics);
screenWidth = metrics.widthPixels;
}
}
And after declare this implementation:
Button mButton = (Button) findViewById(R.id.button);
mButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
float scale = SomeActivity.screenWidth / view.getWidth();
if(view.getScaleX() == 1) {
view.setScaleY(scale);
view.setScaleX(scale);
} else{
view.setScaleY(1);
view.setScaleX(1);
}
}
});
OK. I've found solution. I use some async task that affects ImageView (loading image). When I disabled it resize button started to work as excepted. Thanks for your help.
I know there are some questions about this topic but neither did work for me. I have created a simple button in a RelativeLayout and when I click on it I'd like the button to jump in the middle of the screen. So I have to set the button to CenterHorizontal and CenterVertical programatically.
Here is my code to set the button centerHorizontal:
Button btn;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btn = (Button)findViewById(R.id.button);
final RelativeLayout.LayoutParams layoutParams =
(RelativeLayout.LayoutParams)btn.getLayoutParams();
layoutParams.addRule(RelativeLayout.CENTER_HORIZONTAL,0);
btn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
btn.setLayoutParams(layoutParams);
}
});
}
And here is my xml:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
android:layout_height="match_parent" android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
android:paddingBottom="#dimen/activity_vertical_margin" tools:context=".MainActivity">
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="New Button"
android:id="#+id/button"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"/>
</RelativeLayout>
When I press the button nothing happens. If anyone has an idea how to fix it please response.
So i found a few problems in your code:
1. You have to add the rule after a button click because you create a reference betwen the variable "layoutParams" and the object.
2.You need to get rid of the existing rules.
Sample code:
btn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
layoutParams.addRule(RelativeLayout.ALIGN_PARENT_LEFT, 0);
layoutParams.addRule(RelativeLayout.ALIGN_PARENT_START, 0);
layoutParams.addRule(RelativeLayout.ALIGN_PARENT_TOP, 0);
layoutParams.addRule(RelativeLayout.CENTER_HORIZONTAL);
btn.setLayoutParams(layoutParams);
}
});
You have to remove your align left rules which you have defined in the xml.
Button btn = (Button)findViewById(R.id.button);
RelativeLayout.LayoutParams lp = (RelativeLayout.LayoutParams) btn.getLayoutParams();
lp.addRule(RelativeLayout.CENTER_HORIZONTAL, 1);
lp.removeRule(RelativeLayout.ALIGN_PARENT_START);
lp.removeRule(RelativeLayout.ALIGN_PARENT_LEFT);
btn.setLayoutParams(lp);
keep in mind that RelativeLayout.LayoutParams.removeRule is only supported for API >= 17
Hello I have this very simple code I'm trying to run via Android Studio
public class MainActivity extends ActionBarActivity {
Button random;
TextView display;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
random = (Button) findViewById(R.id.button);
display = (TextView) findViewById(R.id.TextView);
random.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
display.setText("I have changed");
}
});
I haven't really added very much, but whenever I use the setOnClickListener no matter what's inside of it crashes the app. I couldn't find a solution for this.
Thank you.
//edit: sorry. I added a wrong code, random is a button
It doesn't seem to be your case but I had the same problem and it was caused by having these lines
mButton = findViewById(R.id.button);
mButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// ...
}
});
before
setContentView(R.layout.activity_main);
You are setting the setOnClickListener method on the random object which by your code is currently Null.
So you are getting a NullPointerException.
I think you intended it to be button instead.
What is "random"? I think correctly will be:
button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
display.setText("I have changed");
}
});
In your code you are setting click listener on a button. Please make sure you get right id and right object to set listener. The button you want to set clcik listener on should have same id to the id you defined in you activity
In Activity
Button button =(Button)findViewById(R.id.button1);
In XML
<Button
android:id="#+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Button" />
Firstly,check logcat by error level
Secondly,random is not initialized!!
You need
1.Create button in activity_main.xml
For example,
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity" >
<Button
android:id="#+id/myCoolButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Button" />
</RelativeLayout>
2.Init that button in code
Button myCoolButton = (Button) findViewById(R.id.myCoolButton);
3.Attach listener to button
myCoolButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
display.setText("I have changed");
}});
And it works! Hope that help you
I want to add views on click of button. My screen has a text view and an edit text and a "Add More" button. on the click of button another set of text view and edit text should get appended to the screen. I am also planning to add scroll view once the my screen grows longer.
My Code snippet is as follows
button.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
text.setText("hello how are you?"); //this is just an example, I may want to add lot more here.
linearLayout.addView(text);
setContentView(linearLayout);
}
I know I am missing something very basic but I do not know what is that. :(
Please help.
First of all, you need to initialize each TextView with a reference to the context. So, in your onClick, given that it is in MyActivity.java:
public void onClick(View v) {
TextView text = new TextView(this);
text.setLayoutParams(new LayoutParams(WRAP_CONTENT, WRAP_CONTENT); // Or what you decide
text.setText("Your text");
linearLayout.addView(text);
}
Second, given that you have a call to setContentView in onCreate which also adds your linearlayout to the view, you do not need to call setContentView(linearLayout) each time the button is clicked.
you should first create a new TextView and EditText add it to the linearLayout using linearLayout.addView(). No need to call setContentView() you probably already added it.
This One help you
In your XML file
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/myMainRelativeLayout"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
tools:context=".MainActivity" >
<Button
android:id="#+id/btnAdd"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:layout_marginBottom="47dp"
android:text="Add Button" />
And your Java file Like
public class MainActivity extends Activity implements
android.view.View.OnClickListener {
Button btnAdd;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btnAdd = (Button) findViewById(R.id.btnAdd);
btnAdd.setOnClickListener(this);
}
#Override
public void onClick(View v) {
if (v.getId() == R.id.btnAdd) {
RelativeLayout rl = (RelativeLayout)findViewById(R.id.myMainRelativeLayout);
Button btn = new Button(this);
btn.setId(1234);
btn.setText("Add Button Runtime");
btn.setOnClickListener(this);
rl.addView(btn);
}
if(v.getId() == 1234)
{
Toast.makeText(getApplicationContext(), "This is Your New Button", Toast.LENGTH_LONG).show();
}
}
}
This one just example you can add any view like this
I have a simple demo with two buttons. They are laid out with a RelativeLayout at the top and bottom of the screen.
When I click one of them, I want them to switch places.
What is the best way to do that?
This is my res/layout/main.xml :
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<ImageButton
android:id="#+id/android_button_1"
android:layout_width="200dip"
android:layout_height="wrap_content"
android:src="#drawable/icon"
android:layout_alignParentTop="true" />
<ImageButton
android:id="#+id/android_button_2"
android:layout_width="200dip"
android:layout_height="wrap_content"
android:src="#drawable/icon2"
android:layout_alignParentBottom="true" />
</RelativeLayout>
And this is my Activity:
public class HelloButtons extends Activity {
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
final ImageButton button1 = (ImageButton) findViewById(R.id.android_button_1);
final ImageButton button2 = (ImageButton) findViewById(R.id.android_button_2);
button1.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
// Perform action on clicks
Toast.makeText(HelloButtons.this, "Beep Bop", Toast.LENGTH_SHORT).show();
}
});
button2.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
// Perform action on clicks
Toast.makeText(HelloButtons.this, "Beep Bop", Toast.LENGTH_SHORT).show();
}
});
}
}
Use something along these lines
RelativeLayout.LayoutParams lp1 = (LayoutParams) b1.getLayoutParams();
RelativeLayout.LayoutParams lp2 = (LayoutParams) b2.getLayoutParams();
lp2.addRule(RelativeLayout.ALIGN_PARENT_BOTTOM, RelativeLayout.TRUE);
lp2.addRule(RelativeLayout.ALIGN_PARENT_TOP, 0);
lp1.addRule(RelativeLayout.ALIGN_PARENT_TOP, RelativeLayout.TRUE);
lp1.addRule(RelativeLayout.ALIGN_PARENT_BOTTOM, 0);
b1.setLayoutParams(lp1);
b2.setLayoutParams(lp2);
(and the opposite to revert them again) in you OnClickListeners
I would say the best way to do that is not to switch the actual ImageButton locations, but to instead switch the ImageButton images and keep track of the state inside your application so it can react to onClicks correctly.