Android-->拍照/相册选择照片(从Uri中获取图片路径)

对于一个APP来说, 照片选择是经常会用到的功能.

拍照获取照片

此方法需要指定照片的路径, 这是最简单的获取照片的方式了;

/**
* 拍照获取图片, imageUri.getPath() 图片路径
*/
public static void getPhotoFromCamera(Activity context, int requestCode, Uri imageUri) {
Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
intent.setAction(MediaStore.ACTION_IMAGE_CAPTURE);
intent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri); // set the image file name
context.startActivityForResult(intent, requestCode);
}
//创建照片的路径
public static String createPhotoPath(Context context) {
String path = FileUtil.getPath("angcyo/Photo");
return path + "/" + UUID.randomUUID();
}

//获取SD卡下的一个安全路径
public static String getPath(String name) {
File file = new File(getSDPath() + "/" + name);
if (!file.exists()) {
try {
file.mkdirs();
} catch (Exception e) {
e.printStackTrace();
return "";
}
}
return file.getAbsolutePath();
}

//获取SD卡的路径
public static String getSDPath() {
return isExternalStorageWritable() ? Environment
.getExternalStorageDirectory().getPath() : Environment
.getDownloadCacheDirectory().getPath();
}

相册选择

这就坑了, 因为不同的手机, 不同的版本返回的数据不一样. 所以需要区分处理;

有些 返回数据的shceme是content, 这种需要查询数据库才能拿到路径.

有些 返回数据的shceme是file, 这种就可以直接getPath()拿到路径,相对简单.

/**
* 相册选择照片, 需要特殊处理才能获取到图片路径
*/
public static void getPhotoFromPhotos(Activity context, int requestCode) {
Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
intent.addCategory(Intent.CATEGORY_OPENABLE);
intent.setType("image/*");
intent.setAction(Intent.ACTION_GET_CONTENT);
context.startActivityForResult(Intent.createChooser(intent, "选择图片"), requestCode);
}

//通用的从uri中获取路径的方法, 兼容以上说到的2个shceme
public static String getPath(final Context context, final Uri uri) {

final boolean isKitKat = Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT;
// DocumentProvider
if (isKitKat && DocumentsContract.isDocumentUri(context, uri)) {
// ExternalStorageProvider
if (isExternalStorageDocument(uri)) {
final String docId = DocumentsContract.getDocumentId(uri);
final String[] split = docId.split(":");
final String type = split[0];

if ("primary".equalsIgnoreCase(type)) {
return Environment.getExternalStorageDirectory() + "/" + split[1];
}

}
// DownloadsProvider
else if (isDownloadsDocument(uri)) {

final String id = DocumentsContract.getDocumentId(uri);
final Uri contentUri = ContentUris.withAppendedId(
Uri.parse("content://downloads/public_downloads"), Long.valueOf(id));

return getDataColumn(context, contentUri, null, null);
}
// MediaProvider
else if (isMediaDocument(uri)) {
final String docId = DocumentsContract.getDocumentId(uri);
final String[] split = docId.split(":");
final String type = split[0];

Uri contentUri = null;
if ("image".equals(type)) {
contentUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
} else if ("video".equals(type)) {
contentUri = MediaStore.Video.Media.EXTERNAL_CONTENT_URI;
} else if ("audio".equals(type)) {
contentUri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
}

final String selection = "_id=?";
final String[] selectionArgs = new String[]{
split[1]
};

return getDataColumn(context, contentUri, selection, selectionArgs);
}
}
// MediaStore (and general)
else if ("content".equalsIgnoreCase(uri.getScheme())) {

// Return the remote address
if (isGooglePhotosUri(uri))
return uri.getLastPathSegment();

return getDataColumn(context, uri, null, null);
}
// File
else if ("file".equalsIgnoreCase(uri.getScheme())) {
return uri.getPath();
}

return "";
}

public static long getId(Context context, Uri uri) {
final boolean isKitKat = Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT;
if (isKitKat && DocumentsContract.isDocumentUri(context, uri)) {
if (isMediaDocument(uri)) {
final String docId = DocumentsContract.getDocumentId(uri);
final String[] split = docId.split(":");
final String type = split[0];

Uri contentUri = null;
if ("image".equals(type)) {
contentUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
} else if ("video".equals(type)) {
contentUri = MediaStore.Video.Media.EXTERNAL_CONTENT_URI;
} else if ("audio".equals(type)) {
contentUri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
}

final String selection = "_id=?";
final String[] selectionArgs = new String[]{
split[1]
};

return getIdColumn(context, contentUri, selection, selectionArgs);
}
} else {
return getIdColumn(context, uri, null, null);
}
return 0;
}

public static String getDataColumn(Context context, Uri uri, String selection,
String[] selectionArgs) {

Cursor cursor = null;
final String column = "_data";
final String[] projection = {
column
};

try {
cursor = context.getContentResolver().query(uri, projection, selection, selectionArgs,
null);
if (cursor != null && cursor.moveToFirst()) {
final int index = cursor.getColumnIndexOrThrow(column);
return cursor.getString(index);
}
} finally {
if (cursor != null)
cursor.close();
}
return "";
}
public static long getIdColumn(Context context, Uri uri, String selection, String[] selectionArgs) {
Cursor cursor = null;
final String column = "_id";
final String[] projection = {column};

try {
cursor = context.getContentResolver().query(uri, projection, selection, selectionArgs, null);
if (cursor != null && cursor.moveToFirst()) {
final int index = cursor.getColumnIndexOrThrow(column);
return cursor.getLong(index);
}
} finally {
if (cursor != null) {
cursor.close();
}
}
return 0;
}
public static boolean isExternalStorageDocument(Uri uri) {
return "com.android.externalstorage.documents".equals(uri.getAuthority());
}
public static boolean isDownloadsDocument(Uri uri) {
return "com.android.providers.downloads.documents".equals(uri.getAuthority());
}
public static boolean isMediaDocument(Uri uri) {
return "com.android.providers.media.documents".equals(uri.getAuthority());
}
public static boolean isGooglePhotosUri(Uri uri) {
return "com.google.android.apps.photos.content".equals(uri.getAuthority());
}

接收数据

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (resultCode == RESULT_OK) {
if (requestCode == CODE_PHOTO) {
} else if (requestCode == CODE_CAMERA) {
} else if (requestCode == CODE_CROP) {
}
}
}

剪切图片

/**
* 用给定的uri,调用 裁剪程序
*/
public static void cropImageByUri(Activity context, int requestCode, Uri from, Uri to, int outputX, int outputY) {
Intent intent = new Intent("com.android.camera.action.CROP");
intent.setDataAndType(from, "image/*");
intent.putExtra("crop", "true");
intent.putExtra("scale", true);
intent.putExtra("scaleUpIfNeeded", true);
intent.putExtra("aspectX", 1);//剪切框宽高比例
intent.putExtra("aspectY", 2);//剪切框宽高比例
intent.putExtra("outputX", outputX);
intent.putExtra("outputY", outputY);
intent.putExtra(MediaStore.EXTRA_OUTPUT, to);
intent.putExtra("return-data", false);
intent.putExtra("outputFormat", Bitmap.CompressFormat.JPEG.toString());
intent.putExtra("noFaceDetection", true); // no face detection
context.startActivityForResult(intent, requestCode);
}

至此: 文章就结束了,如有疑问: QQ群:274306954 欢迎您的加入.