1.在res/xml目录中新建一个file_paths.xml
<?xml version="1.0" encoding="utf-8"?>
<paths>
<files-path name="files" path="files" />
<cache-path name="name" path="path" />
<external-path name="external" path="." />
<external-files-path name="name" path="path" />
<external-cache-path name="name" path="path" />
</paths>
2.在清单文件中申明FileProvider
<!-- 7.0文件权限 -->
<provider
android:name="android.support.v4.content.FileProvider"
android:authorities="${applicationId}.fileprovider"
android:exported="false"
android:grantUriPermissions="true">
<meta-data
android:name="android.support.FILE_PROVIDER_PATHS"
android:resource="@xml/file_paths" />
</provider>
3.从相册获取图片
val intent = Intent()
intent.action = Intent.ACTION_PICK
intent.type = "image/*"
startActivityForResult(intent, REQUEST_IMAGE)
4.从相机城乡获取图片
private fun openCamera() {
// 创建File对象,用于存储拍照后的图片
val outputImage = File(externalCacheDir, "output_image.jpg")
try {
if (outputImage.exists()) {
outputImage.delete()
}
outputImage.createNewFile()
} catch (e: IOException) {
e.printStackTrace()
}
cameraImageUri = if (Build.VERSION.SDK_INT < 24) {
Uri.fromFile(outputImage)
} else {
FileProvider.getUriForFile(this,
packageName + ".fileprovider",
outputImage)
}
// 启动相机程序
val intent = Intent("android.media.action.IMAGE_CAPTURE")
intent.putExtra(MediaStore.EXTRA_OUTPUT, cameraImageUri)
startActivityForResult(intent, TAKE_PHOTO)
}
5.获取图片结果
override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
super.onActivityResult(requestCode, resultCode, data)
when (requestCode) {
REQUEST_IMAGE -> run {
if (data != null) {
val uri = data.data
cropPhoto(uri)
}
}
PICTURE_CUT -> try {
iv_head_activity_setting.setImageBitmap(
BitmapFactory.decodeFile(
ImageUtil.getImageAbsolutePath(this, outputUri)))
} catch (e: Exception) {
println("获取异常")
}
TAKE_PHOTO ->
cropPhoto(cameraImageUri)
}
}
6.裁剪图片
/**
* 裁剪图片
*/
private fun cropPhoto(uri: Uri?) {
if (uri == null) return
// 创建File对象,用于存储裁剪后的图片,避免更改原图
val file = File(externalCacheDir, "crop_head.jpg")
try {
if (file.exists()) {
file.delete()
}
file.createNewFile()
} catch (e: IOException) {
e.printStackTrace()
}
outputUri = Uri.fromFile(file)
val intent = Intent("com.android.camera.action.CROP")
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION)
}
intent.setDataAndType(uri, "image/*")
intent.putExtra("aspectX", 1)
intent.putExtra("aspectY", 1)
intent.putExtra("crop", "true")//可裁剪
intent.putExtra("scale", true)//支持缩放
intent.putExtra("return-data", false)
intent.putExtra(MediaStore.EXTRA_OUTPUT, outputUri)
intent.putExtra("outputFormat", Bitmap.CompressFormat.JPEG.toString())//输出图片格式
intent.putExtra("noFaceDetection", true)//取消人脸识别
startActivityForResult(intent, PICTURE_CUT)
}
7.通过Uri获取图片的真实地址
/**
* 根据Uri获取图片绝对路径,解决Android4.4以上版本Uri转换
*
* @param context
* @param imageUri
*/
@TargetApi(19)
public static String getImageAbsolutePath(Context context, Uri imageUri) {
if (context == null || imageUri == null)
return null;
if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.KITKAT && DocumentsContract.isDocumentUri(context, imageUri)) {
if (isExternalStorageDocument(imageUri)) {
String docId = DocumentsContract.getDocumentId(imageUri);
String[] split = docId.split(":");
String type = split[0];
if ("primary".equalsIgnoreCase(type)) {
return Environment.getExternalStorageDirectory() + "/" + split[1];
}
} else if (isDownloadsDocument(imageUri)) {
String id = DocumentsContract.getDocumentId(imageUri);
Uri contentUri = ContentUris.withAppendedId(Uri.parse("content://downloads/public_downloads"), Long.valueOf(id));
return getDataColumn(context, contentUri, null, null);
} else if (isMediaDocument(imageUri)) {
String docId = DocumentsContract.getDocumentId(imageUri);
String[] split = docId.split(":");
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;
}
String selection = MediaStore.Images.Media._ID + "=?";
String[] selectionArgs = new String[]{split[1]};
return getDataColumn(context, contentUri, selection, selectionArgs);
}
} // MediaStore (and general)
else if ("content".equalsIgnoreCase(imageUri.getScheme())) {
// Return the remote address
if (isGooglePhotosUri(imageUri))
return imageUri.getLastPathSegment();
return getDataColumn(context, imageUri, null, null);
}
// File
else if ("file".equalsIgnoreCase(imageUri.getScheme())) {
return imageUri.getPath();
}
return null;
}
public static String getDataColumn(Context context, Uri uri, String selection, String[] selectionArgs) {
Cursor cursor = null;
String column = MediaStore.Images.Media.DATA;
String[] projection = {column};
try {
cursor = context.getContentResolver().query(uri, projection, selection, selectionArgs, null);
if (cursor != null && cursor.moveToFirst()) {
int index = cursor.getColumnIndexOrThrow(column);
return cursor.getString(index);
}
} finally {
if (cursor != null)
cursor.close();
}
return null;
}
/**
* @param uri The Uri to check.
* @return Whether the Uri authority is ExternalStorageProvider.
*/
public static boolean isExternalStorageDocument(Uri uri) {
return "com.android.externalstorage.documents".equals(uri.getAuthority());
}
/**
* @param uri The Uri to check.
* @return Whether the Uri authority is DownloadsProvider.
*/
public static boolean isDownloadsDocument(Uri uri) {
return "com.android.providers.downloads.documents".equals(uri.getAuthority());
}
/**
* @param uri The Uri to check.
* @return Whether the Uri authority is MediaProvider.
*/
public static boolean isMediaDocument(Uri uri) {
return "com.android.providers.media.documents".equals(uri.getAuthority());
}
/**
* @param uri The Uri to check.
* @return Whether the Uri authority is Google Photos.
*/
public static boolean isGooglePhotosUri(Uri uri) {
return "com.google.android.apps.photos.content".equals(uri.getAuthority());
}