Android学习之图片（一）——从相机和相册取图

这是基本技能了，只是温习一下

转载请注明出处

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相机取图

一般取原图(Save the Full-size Photo)，缩略图用处不多

首先先建个文件，以便写入照片，并保存路径，以方便后期使用

String mCurrentPhotoPath;

private File createImageFile() throws IOException {
// Create an image file name
String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
String imageFileName = "JPEG_" + timeStamp + "_";
File storageDir = getExternalFilesDir(Environment.DIRECTORY_PICTURES);
File image = File.createTempFile(
imageFileName,  /* prefix */
".jpg",         /* suffix */
storageDir      /* directory */
);

// Save a file: path for use with ACTION_VIEW intents
mCurrentPhotoPath = "file:" + image.getAbsolutePath();
return image;
}

然后创建和调用Intent

static final int REQUEST_TAKE_PHOTO = 1;

private void dispatchTakePictureIntent() {
Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
// Ensure that there's a camera activity to handle the intent
if (takePictureIntent.resolveActivity(getPackageManager()) != null) {
// Create the File where the photo should go
File photoFile = null;
try {
photoFile = createImageFile();
} catch (IOException ex) {
// Error occurred while creating the File
...
}
// Continue only if the File was successfully created
if (photoFile != null) {
Uri photoURI = Uri.fromFile(photoFile)；
takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT, photoURI);
startActivityForResult(takePictureIntent, REQUEST_TAKE_PHOTO);
}
}
}

然后在onActivityResult里引用文件路径获取图片就行了

相册取图

创建 并调用Intent

private static final int RESULT_ALBUM_IMAGE=2;
Intent i = new Intent(
Intent.ACTION_PICK,
android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);

startActivityForResult(i, RESULT_ALBUM_IMAGE);

在onActivityResult里获取图片：

if (requestCode == RESULT_ALBUM_IMAGE && resultCode == RESULT_OK
&& data != null) {
Uri selectedImage = data.getData();
String[] filePathColumn = { MediaStore.Images.Media.DATA };

Cursor cursor = getContentResolver().query(selectedImage,
filePathColumn, null, null, null);
cursor.moveToFirst();

int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
final String picturePath = cursor.getString(columnIndex);
Log.d("PICTUREPATH", picturePath);
cursor.close();
Bitmap bitmap=BitmapFactory.decodeFile(picturePath);
mImageView.setImageBitmap(bitmap);
}

就是这样啦