Question

I am dynamically creating views as show below

 public class DynamicLayoutActivity extends Activity 
{
        private LinearLayout linear_layout,linear_main;
    private Button b1,b2,b3;
    private LinearLayout.LayoutParams linear_layout_params,button_parameters; 

    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);

        linear_main = new LinearLayout(this);

        linear_layout = new LinearLayout(this);
        linear_layout_params = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.FILL_PARENT,LinearLayout.LayoutParams.WRAP_CONTENT);
        linear_layout.setOrientation(LinearLayout.VERTICAL);
        linear_layout.setGravity(android.view.Gravity.CENTER);
        linear_layout.setLayoutParams(linear_layout_params);
        linear_layout.setId(3);

  //      button_parameters = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT,LinearLayout.LayoutParams.WRAP_CONTENT);

        b1=new Button(this);
        b1.setText("Button1");
        b1.setId(31);
        b1.setGravity(android.view.Gravity.CENTER);
//        b1.setLayoutParams(button_parameters);

        b2=new Button(this);
        b2.setText("Button1");
        b2.setId(32);
        b2.setGravity(android.view.Gravity.CENTER);
//        b2.setLayoutParams(button_parameters);

        b3=new Button(this);
        b3.setText("Button1");
        b3.setId(33);
        b3.setGravity(android.view.Gravity.CENTER);
//        b3.setLayoutParams(button_parameters);

        linear_layout.addView(b1);
        linear_layout.addView(b2);
        linear_layout.addView(b3);

        linear_main.addView(linear_layout);

        setContentView(linear_main);
    }
}

Similarly, I am doing the same by declaring everthing in an xml file as show below

  <?xml version="1.0" encoding="utf-8"?>
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:orientation="vertical" >

        <Button
            android:id="@+id/button1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Button" />

        <Button
            android:id="@+id/button2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Button" />

        <Button
            android:id="@+id/button3"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Button" />

    </LinearLayout>

Suppose assume i have 100 buttons in the Linear Layout mentioned above then which is the best way to do and which has the best performance related to memory occupied and execution time

If you support a scenario, then please explain me your views why that scenario is best. Such that i can understand the use of Infalting the xml and Creating Views Dynamically

Thanks in advance ..

Answer 1

I will try to answer your question

If you define Layout & controls in xml then you inflate them into code which i think will be bit slower than instantiating views manually.But i dont think we can make out the difference.

• Also you have following advantages if you use xml based layouts.

1 they allows us to support various Screen Resolutions and Orientation (You need to place main.xml file for each profile in respective folder like ldpi,mdpi,hdpi,xhdpi)

2 You can easily alter your layouts without touching java code.