how to change the image of a button with every cli

问题:

I created a button in the layout . In the Drawable folder I created a XML file named btn01_state. The btn01_state.xml is assigned to the button i created through "android:background=@drawable/btn01_state"

Now, the button has a default image img1.when i click on the button, the image1 changes to img2, and once i release the clicked mouse button, the image2 again changed to img1 again.

what i want to do is,to change the image of the button with evey click.

for an example, initially btn01 has img01

if btn01 is pressed==> set img of btn01 to img02 and keep img02 till the btn01 is pressed again. Now, btn01 has img02 on it.

When btn01 is pressed, set img01 to btn01.

I hope this clarified more what i want to do.

btn_selector:

<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:drawable="@drawable/android_blue"
      android:state_pressed="true" />
<item android:drawable="@drawable/ic_launcher"
      android:state_focused="true" />
<item android:drawable="@drawable/ic_launcher" />

main.xml

<Button 
    android:layout_height="wrap_content"
    android:layout_width="wrap_content"
    android:id="@+id/btn01"
    android:background="@drawable/btn01_state"/>

回答1:

You can do it easily within the code.

boolean isPressed = false;
button.setOnClickListener(buttonListener);

OnClickListener buttonListener = new OnClickListener() {
    @Override
    public void onClick(View v) {
        if(isPressed)
           button.setBackgroundResource(R.drawable.icon1);
        else
           button.setBackgroundResource(R.drawable.icon2);

        isPressed = !isPressed;
   }
};

回答2:

Simple way

btn.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View arg0) {
                // TODO Auto-generated method stub
    btn.setBackgroundDrawable(getResources().getDrawable(R.drawable.locationbutton_on));
                }
        }); 

回答3:

Make it in code perhaps. Put a listener on the button and when the button is clicked the background is changed.