I just added a new drawable folder under res folder. In the drawable folder, i copied the ic_launcher.png file from drawable-hdpi folder.
I wanna change the standard ImageButton image through the new one when i press the button. I wrote some code, but when i start the app, it crashes.
Button imgButton;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
findViewById(R.id.imgButton).setOnClickListener(imgButtonHandler);
}
View.OnClickListener imgButtonHandler = new View.OnClickListener() {
public void onClick(View v) {
imgButton.setBackgroundResource(R.drawable.ic_launcher);
}
};
EDIT: I changed to this, and this also not works.
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
imgButton = (Button) findViewById(R.id.imgButton);
imgButton.setOnClickListener(imgButtonHandler);
}
View.OnClickListener imgButtonHandler = new View.OnClickListener() {
public void onClick(View v) {
imgButton.setBackgroundResource(R.drawable.ic_launcher);
}
};
EDIT 2: THIS WORKS. Thanks to all.
ImageButton button;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
button= (ImageButton)findViewById(R.id.imgButton);
button.setOnClickListener(imgButtonHandler);
}
View.OnClickListener imgButtonHandler = new View.OnClickListener() {
public void onClick(View v) {
button.setBackgroundResource(R.drawable.ic_launcher);
}
};
This misled me a bit – it should be setImageResource instead of setBackgroundResource 🙂 !!
The following works fine :
ImageButton btn = (ImageButton)findViewById(R.id.imageButton1);
btn.setImageResource(R.drawable.actions_record);
while when using the setBackgroundResource the actual imagebutton’s image
stays while the background image is changed which leads to a ugly looking imageButton object
Thanks.
Answer：
<ImageButton android:src="@drawable/image_btn_src" ... />
image_btn_src.xml
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_pressed="true" android:drawable="@drawable/icon_pressed"/>
<item android:state_pressed="false" android:drawable="@drawable/icon_unpressed"/>
</selector>
Answer：
That is because imgButton is null.
Try this instead:
findViewById(R.id.imgButton).setBackgroundResource(R.drawable.ic_action_search);
or much easier to read:
imgButton = (Button) findViewById(R.id.imgButton);
imgButton.setOnClickListener(imgButtonHandler);
then in onClick: imgButton.setBackgroundResource(R.drawable.ic_action_search);
Answer：
You can do it right in your XML file:
android:onClick="@drawable/ic_action_search"
Answer：
You have assing button to your imgButton variable:
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
imgButton = (Button) findViewById(R.id.imgButton);
imgButton.setOnClickListener(imgButtonHandler);
}
Tags: androidandroid, button, image
