How to add a common button in all activity?-CodePudding

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.

CodePudding user response：

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() {
//
//
}

CodePudding user response：

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.
    }
}