How to create simple Android TextView and display text on it using java code?

Question

I have created a sample project and run 'Hello Android Application' in Eclipse.

I have learned that a Textview can be created in two ways, either using an XML tag or by using Java code.

By default I have one Textview saying "Hello world" in my sample project. I want to create a Textview using Java code and display some message on it.

I have searched a lot, but I am unable to understand the steps and layout settings mentioned in the code.

This is what I have done:

import android.app.Activity;
import android.view.Menu;
import android.view.ViewGroup;
import android.widget.*;
import android.view.View;

public class MainActivity extends Activity {

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

        LinearLayout.LayoutParams params = 
                new LinearLayout.LayoutParams( 
                   ViewGroup.LayoutParams.WRAP_CONTENT, 
                   ViewGroup.LayoutParams.WRAP_CONTENT, 0.0F);

        TextView tx= new TextView(this);
//      tx.setLayoutParams(new LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT));
        tx.setText("ANDROID APP");
        lay
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.activity_main, menu);
        return true;
    }
}

Further I don't know how to add this textview in addView().

This is my activity_main.xml:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity" >
</RelativeLayout>

A step by step solution would be helpful for me and any good tutorial link would be appreciable. Thank you in advance!

Answer 1

Use this code, Create text view and set layout params

TextView dynamicTextView = new TextView(this);
dynamicTextView.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
dynamicTextView.setText(" Hello World ");

add this textview to the main layout

mainlayout.addView(dynamicTextView);