android如何取得本地通讯录的头像的原图的实现代码

getListView().setOnItemClickListener(new AdapterView.OnItemClickListener() {  @Override  public void onItemClick(AdapterView<?> parent, View view, int position, long id) {   try {     Cursor cursor = (Cursor) getListAdapter().getItem(position);     if (cursor == null) {      return;     }      int contactId = cursor.getInt(Personal.ID_COLUMN_INDEX);     Intent intent = new Intent();     intent.setClass(ContactsList.this, ContactDetail.class);     intent.putExtra("contactId",contactId);     startActivity(intent);   }catch(Exception ex) {     ex.printStackTrace();   }  }});

public class ContactDetail extends Activity {   private ImageView contact_photo;   public static void startActivity(Context context) {    Intent intent = new Intent();    intent.setClass(context,ContactDetail.class);    context.startActivity(intent);  }   @Override  protected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    requestWindowFeature(Window.FEATURE_NO_TITLE);    setContentView(R.layout.contact_detail);     int contactId = getIntent().getIntExtra("contactId", 0);     contact_photo = (ImageView)findViewById(R.id.contact_photo);     loadTask task = new loadTask(contactId);    task.execute();   }    private class loadTask extends AsyncTask<Void, Void, Bitmap> {     public loadTask(int id) {      contactId = id;    }    private int contactId;     @Override    protected Bitmap doInBackground(Void... params) {      InputStream inputStream = openDisplayPhoto(contactId);       BitmapFactory.Options opt = new BitmapFactory.Options();      opt.inSampleSize = 1;      Bitmap bitmap = BitmapFactory.decodeStream(inputStream, null, opt);      return bitmap;    }     @Override    protected void onPostExecute(Bitmap result) {       if(result != null) {        contact_photo.setImageBitmap(result);      }      super.onPostExecute(result);    }   }   /**   * 这个是取到清晰图的inputStream的代码   * @param contactId   * @return   */  public InputStream openDisplayPhoto(long contactId) {    Uri contactUri = ContentUris.withAppendedId(ContactsContract.Contacts.CONTENT_URI, contactId);    Uri displayPhotoUri = Uri.withAppendedPath(contactUri, ContactsContract.Contacts.Photo.DISPLAY_PHOTO);    try {      AssetFileDescriptor fd =          this.getContentResolver().openAssetFileDescriptor(displayPhotoUri, "r");      return fd.createInputStream();    } catch (IOException e) {      e.printStackTrace();      return null;    }  } }