单击按钮时如何更改布局的背景图像

Question

How to change the background image of a layout, using one button.

I know how to set one image for background of layout, but how to switch between TWO or more image? I think i will must create a array of images

MainActivity.java

Button button = (Button) findViewById(R.id.button);
        button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
        LinearLayout view = (LinearLayout) findViewById(R.id.layout1);
        view.setBackgroundResource(R.drawable.image);
        }
        });

For example: the background in the calculator should switch when you click the "equal" button

i press the equal button

and the background changes from the picture of Fiona to Shrek

Answer 1

To show an Array of images as background, you need to create your Array , and an index to point to a position within your Array

private int[] images;  // declare your array in global scope
private int imagesIndex = 0;

Then you need to populate your Array with Drawable Resources . You can do it in onCreate() method (if using Array in `Activity).

int numOfImages = 4;
images = new int[numOfImages];
images[0] = R.drawable.ic_launcher_background;
images[1] = R.drawable.ic_launcher_foreground;
images[2] = R.drawable.fiona;
images[3] = R.drawable.shrek;

Finally in Click Listener of your Button you simply need to select a resource from your Array .

 @Override
 public void onClick(View v) {
     LinearLayout view = (LinearLayout) findViewById(R.id.layout1);
     view.setBackgroundResource(images[imagesIndex]); 
     ++imagesIndex;  // update index, so that next time it points to next resource
     if (imagesIndex == images.length - 1)
         imagesIndex = 0; // if we have reached at last index of array, simply restart from beginning.
  }

Answer 2

try out this to switch between two images

final Switch s = (Switch) findViewById(R.id.switch1);
s.setOnClickListener(new View.OnClickListener(){
    public void onClick(View v){
        if (s.isChecked()){
           view.setBackgroundResource(R.drawable.image1);
        }else{
            view.setBackgroundResource(R.drawable.image2);
        }
    }
});

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