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I am quite new to Android development. Can someone let me know the relevant APIs to dynamically update a TextView (or entire screen )?

For example: I have a search application and I need to show the results as they are found rather than waiting for all results and then show.

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There are a few steps and you didn't mention how much you know versus how much you don't.

Assuming your UI initial structure is defined in the res/layout and it includes a TextView somewhere, in your activity:

public void updateTextView(String toThis) {
    TextView textView = (TextView) findViewById(R.id.textView);
    textView.setText(toThis);
}

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