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Intent intent = new Intent(Intent.ACTION_PICK);
intent.setType("image/*");
intent.setData(android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
startActivityForResult(intent, 0);

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package com.example.userinput;

import android.os.Bundle;
import android.app.Activity;
import android.util.Log;
import android.view.KeyEvent;
import android.view.MotionEvent;

public class UserInputActivity extends Activity {

seungwoonlee

package com.example.lockscreen;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.Window;
import android.view.WindowManager;
import android.widget.Button;
import android.widget.Toast;

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public void onClick(View v) {
	if (v.getId() == R.id.Button01) {	// if you pressed the 'Button01'
		finish();						// finish this Activity
	}
}