android从图库中拾取图像
我想从图库创建一个图片选择器。我使用代码android从图库中拾取图像,android,gallery,action,Android,Gallery,Action,我想从图库创建一个图片选择器。我使用代码 intent = new Intent(Intent.ACTION_PICK, android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI); startActivityForResult(intent, TFRequestCodes.GALLERY); 我的问题是,在这个活动和视频文件显示。是否有办法筛选显示的文件,以便在此活动中不显示任何视频文件?绝对正确。试试这个: Intent
intent = new Intent(Intent.ACTION_PICK, android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
startActivityForResult(intent, TFRequestCodes.GALLERY);
我的问题是,在这个活动和视频文件显示。是否有办法筛选显示的文件,以便在此活动中不显示任何视频文件?绝对正确。试试这个:
Intent intent = new Intent();
intent.setType("image/*");
intent.setAction(Intent.ACTION_GET_CONTENT);
startActivityForResult(Intent.createChooser(intent, "Select Picture"), PICK_IMAGE);
不要忘了创建常量PICK_IMAGE,以便您可以识别用户何时从图像库活动返回:
public static final int PICK_IMAGE = 1;
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data)
{
if (requestCode == PICK_IMAGE) {
//TODO: action
}
}
这就是我对图像库的称呼。把它放进去,看看是否对你有用
编辑:
这将打开文档应用程序。要允许用户也使用他们可能已安装的任何图库应用程序,请执行以下操作:
Intent getIntent = new Intent(Intent.ACTION_GET_CONTENT);
getIntent.setType("image/*");
Intent pickIntent = new Intent(Intent.ACTION_PICK, android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
pickIntent.setType("image/*");
Intent chooserIntent = Intent.createChooser(getIntent, "Select Image");
chooserIntent.putExtra(Intent.EXTRA_INITIAL_INTENTS, new Intent[] {pickIntent});
startActivityForResult(chooserIntent, PICK_IMAGE);
有时,您无法从所选图片中获取文件。 这是因为choosen one来自Google+、Drive、Dropbox或任何其他提供商 最好的解决方案是让系统通过选择内容,并通过内容提供商获得结果 您可以按照下面的代码或查看我的
如果您只查找图像和多个选择 看一次
这对未来很有帮助。我个人觉得使用它很棒。你可以做得比这更容易回答:
Uri Selected_Image_Uri = data.getData();
ImageView imageView = (ImageView) findViewById(R.id.loadedimg);
imageView.setImageURI(Selected_Image_Uri);
您可以使用此方法从库中拾取图像。仅显示图像
public void pickImage() {
Intent intent = new Intent(Intent.ACTION_PICK,
MediaStore.Images.Media.INTERNAL_CONTENT_URI);
intent.setType("image/*");
intent.putExtra("crop", "true");
intent.putExtra("scale", true);
intent.putExtra("outputX", 256);
intent.putExtra("outputY", 256);
intent.putExtra("aspectX", 1);
intent.putExtra("aspectY", 1);
intent.putExtra("return-data", true);
startActivityForResult(intent, 1);
}
并将onActivityResult覆盖为
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (resultCode != RESULT_OK) {
return;
}
if (requestCode == 1) {
final Bundle extras = data.getExtras();
if (extras != null) {
//Get image
Bitmap newProfilePic = extras.getParcelable("data");
}
}
}
下面是请求权限的完整示例(如果需要),从库中选择图像,然后将图像转换为
位图
或文件
AndroidManifesh.xml
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
<?xml version="1.0" encoding="utf-8"?>
<paths>
<external-path name="external_files" path="."/>
</paths>
<application
...>
...
<provider
android:name="androidx.core.content.FileProvider"
android:authorities="${applicationId}.provider"
android:exported="false"
android:grantUriPermissions="true">
<meta-data
android:name="android.support.FILE_PROVIDER_PATHS"
android:resource="@xml/provider_paths" />
</provider>
...
</application>
活动
class MainActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
button_pick_image.setOnClickListener {
pickImage()
}
}
private fun pickImage() {
if (ActivityCompat.checkSelfPermission(this, READ_EXTERNAL_STORAGE) == PackageManager.PERMISSION_GRANTED) {
val intent = Intent(
Intent.ACTION_PICK,
MediaStore.Images.Media.INTERNAL_CONTENT_URI
)
intent.type = "image/*"
intent.putExtra("crop", "true")
intent.putExtra("scale", true)
intent.putExtra("aspectX", 16)
intent.putExtra("aspectY", 9)
startActivityForResult(intent, PICK_IMAGE_REQUEST_CODE)
} else {
ActivityCompat.requestPermissions(
this,
arrayOf(Manifest.permission.READ_EXTERNAL_STORAGE),
READ_EXTERNAL_STORAGE_REQUEST_CODE
)
}
}
override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
super.onActivityResult(requestCode, resultCode, data)
if (requestCode == PICK_IMAGE_REQUEST_CODE) {
if (resultCode != Activity.RESULT_OK) {
return
}
val uri = data?.data
if (uri != null) {
val imageFile = uriToImageFile(uri)
// todo do something with file
}
if (uri != null) {
val imageBitmap = uriToBitmap(uri)
// todo do something with bitmap
}
}
}
override fun onRequestPermissionsResult(requestCode: Int, permissions: Array<out String>, grantResults: IntArray) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults)
when (requestCode) {
READ_EXTERNAL_STORAGE_REQUEST_CODE -> {
if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
// pick image after request permission success
pickImage()
}
}
}
}
private fun uriToImageFile(uri: Uri): File? {
val filePathColumn = arrayOf(MediaStore.Images.Media.DATA)
val cursor = contentResolver.query(uri, filePathColumn, null, null, null)
if (cursor != null) {
if (cursor.moveToFirst()) {
val columnIndex = cursor.getColumnIndex(filePathColumn[0])
val filePath = cursor.getString(columnIndex)
cursor.close()
return File(filePath)
}
cursor.close()
}
return null
}
private fun uriToBitmap(uri: Uri): Bitmap {
return MediaStore.Images.Media.getBitmap(this.contentResolver, uri)
}
companion object {
const val PICK_IMAGE_REQUEST_CODE = 1000
const val READ_EXTERNAL_STORAGE_REQUEST_CODE = 1001
}
}
class MainActivity:AppCompatActivity(){
重写创建时的乐趣(savedInstanceState:Bundle?){
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
按钮\u pick\u image.setOnClickListener{
pickImage()
}
}
私人图像(){
if(ActivityCompat.checkSelfPermission(此,读取外部存储)==PackageManager.PERMISSION\u已授予){
val intent=intent(
意向、行动、选择,
MediaStore.Images.Media.INTERNAL\u CONTENT\u URI
)
intent.type=“image/*”
intent.putExtra(“裁剪”、“真实”)
意向。额外(“比例”,真实)
intent.putExtra(“aspectX”,16)
意图。putExtra(“aspectY”,9)
startActivityForResult(意图、拾取图像、请求代码)
}否则{
ActivityCompat.requestPermissions(
这
阵列(清单、权限、读取外部存储),
读取外部存储请求代码
)
}
}
重写activityResult(请求代码:Int,结果代码:Int,数据:Intent?){
super.onActivityResult(请求代码、结果代码、数据)
if(requestCode==PICK\u IMAGE\u REQUEST\u CODE){
if(resultCode!=活动。结果\u确定){
返回
}
val uri=数据?.data
if(uri!=null){
val imageFile=uriToImageFile(uri)
//如何处理文件
}
if(uri!=null){
val imageBitmap=uriToBitmap(uri)
//用位图做些什么
}
}
}
重写onRequestPermissionsResult(请求代码:Int,权限:Array,GrantResult:IntArray){
super.onRequestPermissionsResult(请求代码、权限、GrantResult)
何时(请求代码){
读取外部存储请求代码->{
if(grantResults[0]==已授予PackageManager.权限){
//请求权限成功后拾取图像
pickImage()
}
}
}
}
private-fun-uriToImageFile(uri:uri):文件{
val filePathColumn=arrayOf(MediaStore.Images.Media.DATA)
val cursor=contentResolver.query(uri,filePathColumn,null,null)
如果(光标!=null){
if(cursor.moveToFirst()){
val columnIndex=cursor.getColumnIndex(filePathColumn[0])
val filePath=cursor.getString(columnIndex)
cursor.close()
返回文件(文件路径)
}
cursor.close()
}
返回空
}
private-fun-uriToBitmap(uri:uri):位图{
返回MediaStore.Images.Media.getBitmap(this.contentResolver,uri)
}
伴星{
const val PICK_IMAGE_REQUEST_CODE=1000
常量值读取\外部\存储\请求\代码=1001
}
}
演示对于仅从本地拾取,请添加以下内容:
i.putExtra(Intent.EXTRA_LOCAL_ONLY,true)
这个工作很好:
val i = Intent(Intent.ACTION_GET_CONTENT,MediaStore.Images.Media.EXTERNAL_CONTENT_URI)
i.type = "image/*"
i.putExtra(Intent.EXTRA_LOCAL_ONLY,true)
startActivityForResult(Intent.createChooser(i,"Select Photo"),pickImageRequestCode)
仅为使用API min 19的用户提供答案更新,请参见以下文档: 在Android 4.4(API级别19)及更高版本上,您还可以选择使用ACTION_OPEN_DOCUMENT intent,它显示一个由系统控制的选择器UI,允许用户浏览其他应用程序提供的所有文件。从这个UI中,用户可以从任何受支持的应用程序中选择文件 在Android 5.0(API级别21)及更高版本上,您还可以使用ACTION_OPEN_DOCUMENT_TREE intent,它允许用户为客户端应用程序选择要访问的目录
我也有同样的问题,我用这个密码 添加物
Intent intent = new Intent();
intent.setType("image/*");
intent.setAction(Intent.ACTION_GET_CONTENT);
startActivityForResult(Intent.createChooser(intent, "Tack Image"), PICK_PHOTO);
在ActivityResult上添加
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == PICK_PHOTO && resultCode == Activity.RESULT_OK) {
if (data == null) {
//error
return;
}
try {
Uri uri = data.getData();
File file = FileUtil.from(currentActivity, uri);
} catch (IOException e) {
e.printStackTrace();
}
}
}
FileUtil类
import android.content.Context;
import android.database.Cursor;
import android.net.Uri;
import android.provider.OpenableColumns;
import android.util.Log;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
public class FileUtil {
private static final int EOF = -1;
private static final int DEFAULT_BUFFER_SIZE = 1024 * 4;
private FileUtil() {
}
public static File from(Context context, Uri uri) throws IOException {
InputStream inputStream = context.getContentResolver().openInputStream(uri);
String fileName = getFileName(context, uri);
String[] splitName = splitFileName(fileName);
File tempFile = File.createTempFile(splitName[0], splitName[1]);
tempFile = rename(tempFile, fileName);
tempFile.deleteOnExit();
FileOutputStream out = null;
try {
out = new FileOutputStream(tempFile);
} catch (FileNotFoundException e) {
e.printStackTrace();
}
if (inputStream != null) {
copy(inputStream, out);
inputStream.close();
}
if (out != null) {
out.close();
}
return tempFile;
}
private static String[] splitFileName(String fileName) {
String name = fileName;
String extension = "";
int i = fileName.lastIndexOf(".");
if (i != -1) {
name = fileName.substring(0, i);
extension = fileName.substring(i);
}
return new String[]{name, extension};
}
private static String getFileName(Context context, Uri uri) {
String result = null;
if (uri.getScheme().equals("content")) {
Cursor cursor = context.getContentResolver().query(uri, null, null, null, null);
try {
if (cursor != null && cursor.moveToFirst()) {
result = cursor.getString(cursor.getColumnIndex(OpenableColumns.DISPLAY_NAME));
}
} catch (Exception e) {
e.printStackTrace();
} finally {
if (cursor != null) {
cursor.close();
}
}
}
if (result == null) {
result = uri.getPath();
int cut = result.lastIndexOf(File.separator);
if (cut != -1) {
result = result.substring(cut + 1);
}
}
return result;
}
private static File rename(File file, String newName) {
File newFile = new File(file.getParent(), newName);
if (!newFile.equals(file)) {
if (newFile.exists() && newFile.delete()) {
Log.d("FileUtil", "Delete old " + newName + " file");
}
if (file.renameTo(newFile)) {
Log.d("FileUtil", "Rename file to " + newName);
}
}
return newFile;
}
private static long copy(InputStream input, OutputStream output) throws IOException {
long count = 0;
int n;
byte[] buffer = new byte[DEFAULT_BUFFER_SIZE];
while (EOF != (n = input.read(buffer))) {
output.write(buffer, 0, n);
count += n;
}
return count;
}
}
您必须将provider\u path.xml添加到类似于图像的xml文件夹中
提供者路径.xml
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
<?xml version="1.0" encoding="utf-8"?>
<paths>
<external-path name="external_files" path="."/>
</paths>
<application
...>
...
<provider
android:name="androidx.core.content.FileProvider"
android:authorities="${applicationId}.provider"
android:exported="false"
android:grantUriPermissions="true">
<meta-data
android:name="android.support.FILE_PROVIDER_PATHS"
android:resource="@xml/provider_paths" />
</provider>
...
</application>
最后在下面的AndroidManifest.xml中添加
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
<?xml version="1.0" encoding="utf-8"?>
<paths>
<external-path name="external_files" path="."/>
</paths>
<application
...>
...
<provider
android:name="androidx.core.content.FileProvider"
android:authorities="${applicationId}.provider"
android:exported="false"
android:grantUriPermissions="true">
<meta-data
android:name="android.support.FILE_PROVIDER_PATHS"
android:resource="@xml/provider_paths" />
</provider>
...
</application>
...
...
我希望我帮助了选项1
下面的代码允许用户从任何文件资源管理器应用程序中选择图像
Intent intent = new Intent();
intent.setType("image/*");
intent.setAction(Intent.ACTION_GET_CONTENT);
startActivityForResult(Intent.createChooser(intent, "Select Picture"), PICK_IMAGE_CODE);
Intent intent = new Intent(Intent.ACTION_PICK, MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
intent.setType("image/*");
startActivityForResult ( intent, PICK_IMAGE_CODE );
但在某些设备中,上述解决方案无法获取带有EXIF信息(如方向)的图像。所以在这些装置中,
dependencies {
implementation "androidx.fragment:fragment:1.3.3"
}