So I have an Android program like so:
package com.example.androiddemo;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.LinearLayout;
public class AndroidDemo extends Activity {
String[] messages = {"Short Text",
"I want to show some really long text" +
"on the display of the phone. " +
"Having run out of ideas on what to type, " +
"I am adding this text which makes absolutely " +
"no sense."};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
final Button add = (Button) findViewById(R.id.addBtn);
final Button clear = (Button) findViewById(R.id.clrBtn);
final EditText text = (EditText) findViewById(R.id.display);
add.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if(v == add){
text.setText(messages[new java.util.Random().nextInt(messages.length)]);
}else if(v == clear){
text.setText("");
}
}
});
}
}
The button to add text to the TextView
works perfectly fine however the text never clears.
My belief was that the operation of TextView
would be analogous to JTextField
or JTextArea
where setting the text to ""
clears it.
How do I clear the text?
The button to add text to the TextView works perfectly fine however the text never clears. My belief was that the operation of TextView would be analogous to JTextField or JTextArea where setting the text to "" clears it.
Using Spans to Style Sections of Text Spans come in really handy when we want to apply styles to portions of text within the same TextView. We can change the text color, change the typeface, add an underline, etc, and apply these to only certain portions of the text.
Try this,
public class AndroidDemo extends Activity implements OnClickListener{
Button add, clear;
EditText text;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
add = (Button) findViewById(R.id.addBtn);
clear = (Button) findViewById(R.id.clrBtn);
text = (EditText) findViewById(R.id.display);
add.setOnClickListener(this);
clear.setOnClickListener(this);
}
@Override
public void onClick(View v){
if(v == add){
text.setText(messages[new java.util.Random().nextInt(messages.length)]);
}else if(v == clear){
text.setText("");
}
}
}
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