<uses-feature android:name="android.hardware.camera2"    <!-- required為false時(shí)，不強(qiáng)制要求設(shè)備支持該功能 -->    <!-- 如果不設(shè)置該值，一旦設(shè)備不支持camera，就不能安裝該應(yīng)用-->    android:required="false"/>

public File getPhotoFile(Crime crime) {  //獲取應(yīng)用對(duì)應(yīng)的存儲(chǔ)照片的外部存儲(chǔ)路徑  File externalFilesDir = mContext      .getExternalFilesDir(Environment.DIRECTORY_PICTURES);  if (externalFilesDir == null) {    return null;  }  //創(chuàng)建指向文件的File對(duì)象  return new File(externalFilesDir, crime.getPhotoFilename());}.............//每個(gè)crime對(duì)應(yīng)的文件名public String getPhotoFilename() {  return "IMG_" + getId().toString() + ".jpg";}

mPhotoButton = (ImageButton) v.findViewById(R.id.crime_camera);//隱式Intent觸發(fā)相機(jī)拍照f(shuō)inal Intent captureImageIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);//mPhotoFile保存著上文創(chuàng)建的指向指定地址的File//此處判斷是否有能夠處理隱式Intent的組件boolean canTakePhoto = mPhotoFile != null    && captureImageIntent.resolveActivity(packageManager) != null;mPhotoButton.setEnabled(canTakePhoto);if (canTakePhoto) {  //得到File文件對(duì)應(yīng)的Uri地址  Uri uri = Uri.fromFile(mPhotoFile);  //將Uri地址存入到Intent中，相機(jī)拍照得到的圖像將會(huì)存入到該Uri地址對(duì)應(yīng)的File里  captureImageIntent.putExtra(MediaStore.EXTRA_OUTPUT, uri);}mPhotoButton.setOnClickListener(new View.OnClickListener() {  @Override  public void onClick(View v) {    startActivityForResult(captureImageIntent, REQUEST_PHOTO);  }});

@Overridepublic void onActivityResult(int requestCode, int resultCode, Intent data) {  .........  } else if (requestCode == REQUEST_PHOTO) {    updatePhotoView();  }  .........}private void updatePhotoView() {  if (mPhotoFile == null || !mPhotoFile.exists()) {    mPhotoView.setImageDrawable(null);  } else {    //加載圖片對(duì)應(yīng)的縮略圖    Bitmap bitmap = PictureUtils.getScaledBitmap(mPhotoFile.getPath(), getActivity());    mPhotoView.setImageBitmap(bitmap);  }}

//在具體視圖未加載前，無(wú)法得到視圖的實(shí)際大小//因此根據(jù)屏幕尺寸，使用估算值進(jìn)行縮放public static Bitmap getScaledBitmap(String path, Activity activity) {  Point size = new Point();  activity.getWindowManager().getDefaultDisplay().getSize(size);  return getScaledBitmap(path, size.x, size.y);}public static Bitmap getScaledBitmap(String path, int destWidth, int destHeight) {  BitmapFactory.Options options = new BitmapFactory.Options();  options.inJustDecodeBounds = true;  //按照正常尺寸解析文件  BitmapFactory.decodeFile(path, options);  //得到原始文件的寬和高  float srcWidth = options.outWidth;  float srcHeight = options.outHeight;  //inSampleSize表示水平/豎直抽樣比  //例如，inSampleSize為2時(shí)，水平和數(shù)值均在原始基礎(chǔ)上，每2個(gè)點(diǎn)抽取1個(gè)點(diǎn)  //于是，新圖的大小變?yōu)樵瓉?lái)的1/4  int inSampleSize = 1;  if (srcHeight > destHeight || srcWidth > destWidth) {    if (srcWidth > srcHeight) {      inSampleSize = Math.round(srcHeight / destHeight);    } else {      inSampleSize = Math.round(srcWidth / destWidth);    }   }  options = new BitmapFactory.Options();  options.inSampleSize = inSampleSize;  //按新的抽樣比，重新解析文件  return BitmapFactory.decodeFile(path, options);}