本文實(shí)例講述了Android開發(fā)實(shí)現(xiàn)ImageView加載攝像頭拍攝的大圖功能。分享給大家供大家參考，具體如下：
這個(gè)方法是從官方demo中摘錄的，在此記錄學(xué)習(xí)。
權(quán)限
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /><uses-feature android:name="android.hardware.camera2" android:required="false" />
另：關(guān)于權(quán)限控制還可參考：Android Manifest功能與權(quán)限描述大全
設(shè)置變量保存文件存儲(chǔ)路徑
private String mCurrentPhotoPath;/*** 拍照flag*/private static final int REQUEST_IMAGE_CAPTURE_O = 2;
創(chuàng)建存儲(chǔ)路徑及文件名
/*** 創(chuàng)建拍攝的圖片的存儲(chǔ)路徑及文件名* @return* @throws IOException*/private File createImageFile() throws IOException{ String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date()); String imageFileName = "JPEG_" + timeStamp + "_"; File storageDir = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES); Log.d("TrainingFirstActivity", "storageDir:" + storageDir); File image = File.createTempFile(imageFileName, ".jpg", storageDir); mCurrentPhotoPath = image.getAbsolutePath(); Log.d("image.getAbsolutePath()", image.getAbsolutePath() + ""); return image;}拍攝圖片并保存
Intent takePictureOintent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);if (takePictureOintent.resolveActivity(getPackageManager()) != null){ File photoFile = null; try { photoFile = createImageFile(); } catch (IOException e) { e.printStackTrace(); } if (photoFile != null){ takePictureOintent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(photoFile)); startActivityForResult(takePictureOintent, REQUEST_IMAGE_CAPTURE_O); }}處理并壓縮拍照結(jié)果,takePhotoThenToShowImg是一個(gè)ImageView控件
@Overrideprotected void onActivityResult(int requestCode, int resultCode, Intent data) { if (requestCode == REQUEST_IMAGE_CAPTURE_O && resultCode == RESULT_OK){ int targetW = takePhotoThenToShowImg.getWidth(); int targetH = takePhotoThenToShowImg.getHeight(); /* Get the size of the image */ BitmapFactory.Options bmOptions = new BitmapFactory.Options(); bmOptions.inJustDecodeBounds = true; BitmapFactory.decodeFile(mCurrentPhotoPath, bmOptions); int photoW = bmOptions.outWidth; int photoH = bmOptions.outHeight; /* Figure out which way needs to be reduced less */ int scaleFactor = 1; if ((targetW > 0) || (targetH > 0)) { scaleFactor = Math.min(photoW/targetW, photoH/targetH); } /* Set bitmap options to scale the image decode target */ bmOptions.inJustDecodeBounds = false; bmOptions.inSampleSize = scaleFactor; bmOptions.inPurgeable = true; /* Decode the JPEG file into a Bitmap */ Bitmap bitmap = BitmapFactory.decodeFile(mCurrentPhotoPath, bmOptions); /* Associate the Bitmap to the ImageView */ takePhotoThenToShowImg.setImageBitmap(bitmap); galleryAddPic(); }}最后可以將拍攝到的照片添加到Media Provider的數(shù)據(jù)庫(kù)中，以便圖庫(kù)或者其他程序讀取照片
/*** 將拍攝到的照片添加到Media Provider的數(shù)據(jù)庫(kù)中*/private void galleryAddPic(){ Intent mediaScanIntent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE); File f = new File(mCurrentPhotoPath); Uri contentUri = Uri.fromFile(f); mediaScanIntent.setData(contentUri); this.sendBroadcast(mediaScanIntent);}如果只需要縮略圖的話，只要調(diào)攝像頭拍攝直接處理結(jié)果就行
@Overrideprotected void onActivityResult(int requestCode, int resultCode, Intent data) { if (requestCode == REQUEST_IMAGE_CAPTURE && resultCode == RESULT_OK){//展示圖片 Bundle extras = data.getExtras(); Bitmap imageBitmap = (Bitmap) extras.get("data"); takePhotoThenToShowImg.setImageBitmap(imageBitmap); }}更多關(guān)于Android相關(guān)內(nèi)容感興趣的讀者可查看本站專題：《Android拍照與圖片處理技巧總結(jié)》、《Android圖形與圖像處理技巧總結(jié)》、《Android開發(fā)入門與進(jìn)階教程》、《Android調(diào)試技巧與常見問題解決方法匯總》、《Android基本組件用法總結(jié)》、《Android視圖View技巧總結(jié)》、《Android布局layout技巧總結(jié)》及《Android控件用法總結(jié)》
希望本文所述對(duì)大家Android程序設(shè)計(jì)有所幫助。
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