Android application fails and stops after clicking a button

i started a small android application to learn. I placed an input text and button on the screen. That shows on the emulator. After i press the button(which has an onClickListener) the application cracks and tells me on the screen of the emulator : "The application... has stopped unexpectably.Try again" and i have a "Force close", which of course closes the application. I cleaned and rebuild the project a lot of times. i have no errors shown.(using eclipse) this is the layout/main.xml:

<ScrollView android:id="@+id/widget37" android:layout_width="247px"
    android:layout_height="282px" android:scrollbars="vertical"
    android:layout_x="38px" android:layout_y="130px">
</ScrollView>
<RadioButton android:id="@+id/compactList"
    android:layout_width="wrap_content" android:layout_height="wrap_content"
    android:text="Compact List" android:layout_x="36px" android:layout_y="78px">
</RadioButton>
<RadioButton android:id="@+id/detailedList"
    android:layout_width="wrap_content" android:layout_height="wrap_content"
    android:text="Detailed List" android:layout_x="176px"
    android:layout_y="78px">
</RadioButton>

this is the activity class:

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;

public class ShowStuffs extends Activity implements View.OnClickListener {

private Button searchbtn;
private EditText input;

public void onCreate(Bundle icicle) {
    super.onCreate(icicle);
    setContentView(R.layout.main);
    searchbtn = (Button)findViewById(R.id.searchBtn);
    searchbtn.setOnClickListener(this);
}
public void onClick(View view) {
    System.out.println("on click..开发者_运维问答.");
    String searchedText = input.getText().toString();

}
}

I cannot figure out what is wrong with it. Any suggestions are more than welcomed.Thank you .

In your layout/main.xml, you need to declare the searchBtn

Something like this:

<Button android:id="@+id/searchBtn"
                    android:layout_width="fill_parent"
                    android:layout_height="wrap_content"
                    android:text="Search Button"/>

Update: I tried with following code with no error.

package com.dude.test1;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

public class foo extends Activity implements View.OnClickListener {

        private Button searchbtn;
        private EditText input;

        public void onCreate(Bundle icicle) {
            super.onCreate(icicle);
            setContentView(R.layout.main);
            searchbtn = (Button)findViewById(R.id.searchBtn);
            input = (EditText) findViewById(R.id.input);
            searchbtn.setOnClickListener(this);
        }
        public void onClick(View view) {
            //System.out.println("on click...");
Toast.makeText(this, "clicked!", Toast.LENGTH_SHORT).show();
            String searchedText = input.getText().toString();

        }


}

XML file:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="fill_parent"
    android:layout_height="fill_parent" android:background="#FFFFFF">
    <ScrollView android:id="@+id/widget37" android:layout_width="247px"
        android:layout_height="282px" android:scrollbars="vertical"
        android:layout_x="38px" android:layout_y="130px">
    </ScrollView>
    <RadioButton android:id="@+id/compactList"
        android:layout_width="wrap_content" android:layout_height="wrap_content"
        android:text="Compact List" android:layout_x="36px" android:layout_y="78px">
    </RadioButton>
    <RadioButton android:id="@+id/detailedList"
        android:layout_width="wrap_content" android:layout_height="wrap_content"
        android:text="Detailed List" android:layout_x="176px"
        android:layout_y="78px">
    </RadioButton>
    <Button android:id="@+id/searchBtn" android:layout_width="fill_parent"
        android:layout_height="wrap_content" android:text="Search Button" />
    <EditText android:id="@+id/input" android:layout_width="fill_parent"
        android:layout_height="wrap_content" />
</LinearLayout>

Looks like a NullPointerException.

String searchedText = input.getText().toString();

Where the input gets its value?

add this to both buttons: android:onClick ="onClick"