Cambiar un ImageView a blanco y negro NO el dibujable

Me gustaría cambiar una imagen a blanco y negro, no el dibujable. La razón de esto es porque el usuario toma una foto y se muestra en la vista de la imagen Si usted sabe cómo hacer esto, id apreciarlo, gracias.

package com.example.triptych4; import java.io.File; import android.app.Activity; import android.content.ContentResolver; import android.content.Context; import android.content.Intent; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.graphics.Color; import android.graphics.ColorMatrix; import android.graphics.ColorMatrixColorFilter; import android.graphics.drawable.Drawable; import android.net.Uri; import android.os.Bundle; import android.os.Environment; import android.provider.MediaStore; import android.util.Log; import android.view.Menu; import android.view.View; import android.view.View.OnClickListener; import android.view.ViewGroup; import android.widget.AdapterView; import android.widget.BaseAdapter; import android.widget.Button; import android.widget.Gallery; import android.widget.ImageButton; import android.widget.ImageView; import android.widget.Toast; public class MainActivity extends Activity { // label our logs "CameraApp3" private static String logtag = "CameraApp3"; // tells us which camera to take a picture from private static int TAKE_PICTURE = 1; // empty variable to hold our image Uri once we store it private Uri imageUri; private Integer[] pics = { R.drawable.android, R.drawable.android3d, R.drawable.background3 }; { ImageView imageView = (ImageView)findViewById(R.id.imageView1); ColorMatrix matrix = new ColorMatrix(); matrix.setSaturation(0); ColorMatrixColorFilter filter = new ColorMatrixColorFilter(matrix); imageView.setColorFilter(filter); } private ImageView imageView; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); Gallery gallery = (Gallery) findViewById(R.id.gallery1); gallery.setAdapter(new ImageAdapter(this)); imageView = (ImageView) findViewById(R.id.imageView1); gallery.setOnItemClickListener( new AdapterView.OnItemClickListener() { @Override public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) { Toast.makeText(getApplicationContext(), "pic:" + arg2, Toast.LENGTH_SHORT).show(); imageView.setImageResource(pics[arg2]); } }); // look for the button we set in the view ImageButton cameraButton = (ImageButton) findViewById(R.id.button_camera); // set a listener on the button cameraButton.setOnClickListener(cameraListener); } // set a new listener private OnClickListener cameraListener = new OnClickListener() { public void onClick(View v) { // open the camera and pass in the current view takePhoto(v); } }; public void takePhoto(View v) { // tell the phone we want to use the camera Intent intent = new Intent("android.media.action.IMAGE_CAPTURE"); // create a new temp file called pic.jpg in the "pictures" storage area of the phone File photo = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES), "pic.jpg"); // take the return data and store it in the temp file "pic.jpg" intent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(photo)); // stor the temp photo uri so we can find it later imageUri = Uri.fromFile(photo); // start the camera startActivityForResult(intent, TAKE_PICTURE); } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.main, menu); return true; } public class ImageAdapter extends BaseAdapter{ private Context context; int imageBackground; public ImageAdapter(Context context){ this.context = context; } @Override public int getCount() { // TODO Auto-generated method stub return pics.length; } @Override public Object getItem(int arg0) { // TODO Auto-generated method stub return arg0; } @Override public long getItemId(int arg0) { // TODO Auto-generated method stub return arg0; } @Override public View getView(int arg0, View arg1, ViewGroup arg2) { // TODO Auto-generated method stub ImageView imageView =new ImageView(context); imageView.setImageResource(pics[arg0]); return imageView; } } // override the original activity result function @Override public void onActivityResult(int requestCode, int resultCode, Intent data) { // call the parent super.onActivityResult(requestCode, resultCode, data); switch(requestCode) { // if the requestCode was equal to our camera code (1) then... case 1: // if the user took a photo and selected the photo to use if(resultCode == Activity.RESULT_OK) { // get the image uri from earlier Uri selectedImage = imageUri; // notify any apps of any changes we make getContentResolver().notifyChange(selectedImage, null); // get the imageView we set in our view earlier ImageButton imageButton = (ImageButton)findViewById(R.id.button_camera); // create a content resolver object which will allow us to access the image file at the uri above ContentResolver cr = getContentResolver(); // create an empty bitmap object Bitmap bitmap; try { // get the bitmap from the image uri using the content resolver api to get the image bitmap = android.provider.MediaStore.Images.Media.getBitmap(cr, selectedImage); // set the bitmap to the image view imageButton.setImageBitmap(bitmap); // notify the user Toast.makeText(MainActivity.this, selectedImage.toString(), Toast.LENGTH_LONG).show(); } catch(Exception e) { // notify the user Toast.makeText(MainActivity.this, "failed to load", Toast.LENGTH_LONG).show(); Log.e(logtag, e.toString()); } } } } } 

Logcat:

 05-22 10:26:07.156: D/AndroidRuntime(24617): Shutting down VM 05-22 10:26:07.156: W/dalvikvm(24617): threadid=1: thread exiting with uncaught exception (group=0x41cac700) 05-22 10:26:07.156: E/AndroidRuntime(24617): FATAL EXCEPTION: main 05-22 10:26:07.156: E/AndroidRuntime(24617): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.example.triptych4/com.example.triptych4.MainActivity}: java.lang.NullPointerException 05-22 10:26:07.156: E/AndroidRuntime(24617): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2219) 05-22 10:26:07.156: E/AndroidRuntime(24617): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2349) 05-22 10:26:07.156: E/AndroidRuntime(24617): at android.app.ActivityThread.access$700(ActivityThread.java:159) 05-22 10:26:07.156: E/AndroidRuntime(24617): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1316) 05-22 10:26:07.156: E/AndroidRuntime(24617): at android.os.Handler.dispatchMessage(Handler.java:99) 05-22 10:26:07.156: E/AndroidRuntime(24617): at android.os.Looper.loop(Looper.java:137) 05-22 10:26:07.156: E/AndroidRuntime(24617): at android.app.ActivityThread.main(ActivityThread.java:5419) 05-22 10:26:07.156: E/AndroidRuntime(24617): at java.lang.reflect.Method.invokeNative(Native Method) 05-22 10:26:07.156: E/AndroidRuntime(24617): at java.lang.reflect.Method.invoke(Method.java:525) 05-22 10:26:07.156: E/AndroidRuntime(24617): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1209) 05-22 10:26:07.156: E/AndroidRuntime(24617): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1025) 05-22 10:26:07.156: E/AndroidRuntime(24617): at dalvik.system.NativeStart.main(Native Method) 05-22 10:26:07.156: E/AndroidRuntime(24617): Caused by: java.lang.NullPointerException 05-22 10:26:07.156: E/AndroidRuntime(24617): at android.app.Activity.findViewById(Activity.java:1914) 05-22 10:26:07.156: E/AndroidRuntime(24617): at com.example.triptych4.MainActivity.<init>(MainActivity.java:47) 05-22 10:26:07.156: E/AndroidRuntime(24617): at java.lang.Class.newInstanceImpl(Native Method) 05-22 10:26:07.156: E/AndroidRuntime(24617): at java.lang.Class.newInstance(Class.java:1130) 05-22 10:26:07.156: E/AndroidRuntime(24617): at android.app.Instrumentation.newActivity(Instrumentation.java:1078) 05-22 10:26:07.156: E/AndroidRuntime(24617): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2210) 05-22 10:26:07.156: E/AndroidRuntime(24617): ... 11 more 

 ImageView imageView = (ImageView)findViewById(R.id.imageView); ... ColorMatrix matrix = new ColorMatrix(); matrix.setSaturation(0); ColorMatrixColorFilter filter = new ColorMatrixColorFilter(matrix); imageView.setColorFilter(filter);