We will go straight to the code.
package com.coderzheaven.seterror;import android.app.Activity;import android.os.Bundle;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.EditText;public class MainActivity extends Activity { @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); Button btn =(Button)findViewById(R.id.button1); btn.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { EditText edittext =(EditText)findViewById(R.id.editText1); if(edittext.getText().length()==0){ edittext.setError("Field cannot be left blank."); } } }); }} |
This is the layout containing the EditText and the Button.
<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" > <EditText android:id="@+id/editText1" android:layout_width="fill_parent" android:layout_height="wrap_content" android:ems="10" > <requestFocus /> </EditText> <Button android:id="@+id/button1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentLeft="true" android:layout_below="@+id/editText1" android:text="Check" /></RelativeLayout> |
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