CODEWITHSUNDEEP
javaandroidandroid-background
maysara
maysara

Reputation: 6419

activity backgrounds in android studio

I have a problem in Android Studio.
I try to change the Activity background from another Activity, but when I run the application, it doesn't work and the application closes 

    public class Settings extends Activity
{


     RelativeLayout rl ;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.settings);


        RadioButton st2 = (RadioButton)findViewById(R.id.style2);
        final  SeekBar sk = (SeekBar)findViewById(R.id.seekBar);




        st2.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {


                rl = (RelativeLayout) findViewById(R.id.mainActivity);
                rl.setBackgroundResource(R.drawable.sh4);
            }

    });

Upvotes: 0

Views: 116

Answers (2)

HellCat2405
HellCat2405

Reputation: 762

This is not the way you do it. findViewById() search only in the current Activity view, in your code it's R.layout.settings.

Use

startActivityForResult(new Intent(MainActivity.this,Settings.class), 1);

to start Settings.

In the settings activity add

st2.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                Intent intent = new Intent();
                intent.putExtra("background_res", R.drawable.sh4);
                setResult(RESULT_OK, intent);
                finish();
            }

    });

In your main activity add

 @Override
  protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    if (data == null) {return;}
    int res = data.getIntExtra("background_res");
    rl = (RelativeLayout) findViewById(R.id.mainActivity);
            rl.setBackgroundResource(res );
  }

More info: How to manage `startActivityForResult` on Android?

Upvotes: 1

Josef El Bez
Josef El Bez

Reputation: 212

Try this

View nameofyourview = findViewById(R.id.randomViewInMainLayout);
// Find the root view
View root = nameofyourview.getRootView()
// Set the color
root.setBackgroundColor(getResources().getColor(android.R.color.red));

Upvotes: 0

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