CODEWITHSUNDEEP
androidkotlinandroid-layout
Rahul
Rahul

Reputation: 41

How to add a common button in all activity?

Can we add a common button on all activity without add code in xml file.

we need to add some code in application class and button show in all activity of app.

Upvotes: 1

Views: 452

Answers (3)

Tenfour04
Tenfour04

Reputation: 93699

I saw in your comments that you specifically want to do this solely from your Application class. It is possible to add a callback that is called during lifecycle methods of every Activity, so you could add a button there. Every one of your Activities will have to have a root view in its layout of the same type and with the same ID for this to work.

class MyApplication: Application() {

    override fun onCreate() {
        super.onCreate()
        
        registerActivityLifecycleCallbacks(object: ActivityLifecycleCallbacks {
            override fun onActivityCreated(activity: Activity, savedInstanceState: Bundle?) {
                val rootView = activity.findViewById<ConstraintLayout>(R.id.myRootView)
                val layoutParams = ConstraintLayout.LayoutParams(
                    ViewGroup.LayoutParams.WRAP_CONTENT,
                    ViewGroup.LayoutParams.WRAP_CONTENT
                ).apply {
                    // Set up the appropriate layout constraints here
                }
                val button = Button(/* ... */)
                rootView.addView(button, layoutParams)
            }

            override fun onActivityStarted(activity: Activity) = Unit

            override fun onActivityResumed(activity: Activity) = Unit

            override fun onActivityPaused(activity: Activity) = Unit

            override fun onActivityStopped(activity: Activity) = Unit

            override fun onActivitySaveInstanceState(activity: Activity, outState: Bundle) = Unit

            override fun onActivityDestroyed(activity: Activity) = Unit
        })
    }
    
}

Personally, I think this is messy, and I would do it in a top level function that you call from onCreate() in each of your Activities. Or better yet, use a single Activity in your app and use Fragments for the different screens.

Upvotes: 1

KpStar
KpStar

Reputation: 132

class ButtonActivity: Activity() { protected var btnCommon: Button

override fun onCreate(saved: Bundle?) {
    var layout = findViewById(R.id.layout) as ConstraintLayout
    btnCommon = Button(this)
    // set Button properties
    layout.addView(button)
}

}

How to use

class MyActivity: ButtonActivity() {
    onCreate() {
      this.btnCommon.setOnClickListener...... // now you can use.
    }
}

Upvotes: 1

Mohammad Bahadori
Mohammad Bahadori

Reputation: 319

First create a BaseActivity. Then add this code to onCreate of that:

class BaseActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_nav_host)
        //the layout of baseActivity 
        LinearLayout layout =(LinearLayout) findViewById (R.id.base_activity_layout);

        //set the properties for button
        Button btnTag = new Button(this);
        btnTag.setLayoutParams(
            new LayoutParams (LayoutParams.WRAP_CONTENT,
            LayoutParams.WRAP_CONTENT
        ));
        btnTag.setText("Button");
        btnTag.setId(some_random_id);

        //add button to the layout
        layout.addView(btnTag);
    }
}

Then let other activities which you want to create being inherited from BaseActivity.

class FirstActivity : BaseActivity() {
//
//
}

class SecondActivity : BaseActivity() {
//
//
}

class ThirdActivity : BaseActivity() {
//
//
}

Upvotes: 1

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