Android 拍照后显示照片

package cn.testcamera;  import java.io.File;  import java.text.SimpleDateFormat;  import java.util.Date;  import android.app.Activity;  import android.content.Intent;  import android.graphics.Bitmap;  import android.graphics.BitmapFactory;  import android.net.Uri;  import android.os.Bundle;  import android.provider.MediaStore;  import android.view.View;  import android.widget.Button;  import android.widget.ImageView;    public class MainActivity extends Activity {      private Button mButton;      private ImageView mImageView;      private File mPhotoFile;      private String mPhotoPath;      public final static int CAMERA_RESULT=8888;      public final static String TAG="xx";      @Override      public void onCreate(Bundle savedInstanceState) {          super.onCreate(savedInstanceState);          setContentView(R.layout.main);          mButton = (Button) findViewById(R.id.button);          mButton.setOnClickListener(new ButtonOnClickListener());          mImageView = (ImageView) findViewById(R.id.imageView);        }        private class ButtonOnClickListener implements View.OnClickListener {          public void onClick(View v) {              try {                  Intent intent = new Intent("android.media.action.IMAGE_CAPTURE");                  mPhotoPath="mnt/sdcard/DCIM/Camera/"+getPhotoFileName();                  mPhotoFile = new File(mPhotoPath);                  if (!mPhotoFile.exists()) {                      mPhotoFile.createNewFile();                  }                  intent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(mPhotoFile));                  startActivityForResult(intent,CAMERA_RESULT);              } catch (Exception e) {              }          }      }            private String getPhotoFileName() {          Date date = new Date(System.currentTimeMillis());          SimpleDateFormat dateFormat = new SimpleDateFormat("'IMG'_yyyyMMdd_HHmmss");          return dateFormat.format(date) + ".jpg";      }            @Override      protected void onActivityResult(int requestCode, int resultCode, Intent data) {          super.onActivityResult(requestCode, resultCode, data);          if (requestCode==CAMERA_RESULT) {               Bitmap bitmap = BitmapFactory.decodeFile(mPhotoPath, null);                 mImageView.setImageBitmap(bitmap);          }      }  }