when run my app on android emulator its show unfortunately app stop message
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity implements View.OnClickListener{
Button blogin;
EditText etusername,etpassword;
TextView registerlink;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
etusername=(EditText) findViewById(R.id.uname);
etpassword=(EditText) findViewById(R.id.upassword);
blogin=(Button) findViewById(R.id.blogin);
registerlink=(TextView) findViewById(R.id.bregister);
blogin.setOnClickListener(this);
registerlink.setOnClickListener(this);
}
@Override
public void onClick(View v) {
switch(v.getId()){
case R.id.blogin:
break;
case R.id.bregister:
startActivity(new Intent(this,RegisterActivity.class));
break;
}
}
}
Xml coding for your reference. Logs shows a Nullpointer exceptions
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:orientation="vertical"
android:layout_width="match_parent"
android:padding="10dp"
android:layout_height="match_parent">
<EditText
android:id="@+id/uname"
android:layout_width="match_parent"
android:hint="@string/unamehint"
android:layout_marginBottom="10dp"
android:layout_height="wrap_content" />
<EditText
android:id="@+id/upassword"
android:inputType="textPassword"
android:layout_width="match_parent"
android:hint="@string/upasswordhint"
android:layout_marginBottom="10dp"
android:layout_height="wrap_content" />
<Button
android:id="@+id/blogin"
android:layout_gravity="center_horizontal"
android:layout_width="wrap_content"
android:layout_marginBottom="10dp"
android:text="@string/buttonname"
android:layout_height="wrap_content" />
<TextView
android:id="@+id/register"
android:text="New User/Register"
android:textStyle="bold"
android:layout_gravity="center_horizontal"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</LinearLayout>
LOGCAT
254 9565-9565/com.example.prakash.aclientz E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.prakash.aclientz, PID: 9565
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.prakash.aclientz/com.example.prakash.aclientz.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.TextView.setOnClickListener(android.view.View$OnClickListener)' on a null object reference
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2325)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2387)
at android.app.ActivityThread.access$800(ActivityThread.java:151)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1303)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5254)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.interna
