android如何取得本地通讯录的头像的原图的实现代码

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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();
   }
  }
});

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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;
    }
  }
 
}