我想从画廊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。是否有一种方法可以过滤显示的文件,以便在此活动中不显示视频文件?
我想从画廊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。是否有一种方法可以过滤显示的文件,以便在此活动中不显示视频文件?
当前回答
由于startActivityForResult()已经废弃,我们可以使用ActivityResultLauncher以以下方式从图库中选择图像:
首先,我们需要定义一个ActivityResultLauncher<String[]>并在onCreate()(用于活动)或onViewCreated()(用于片段)中初始化它
ActivityResultLauncher<String[]> galleryActivityLauncher = registerForActivityResult(new ActivityResultContracts.OpenDocument(), new ActivityResultCallback<Uri>() {
@Override
public void onActivityResult(Uri result) {
if (result != null) {
// perform desired operations using the result Uri
} else {
Log.d(TAG, "onActivityResult: the result is null for some reason");
}
}
});
假设我们需要在点击submitButton时打开图库。
在onClickListener中,我们需要调用
galleryActivityLauncher.launch(new String[]{"image/*"});
这里的技巧是launch()的参数。通过在参数数组中添加"image/*",我们指定文件资源管理器只加载图像。
其他回答
对于只从本地选择添加这个:
i.putExtra(Intent.EXTRA_LOCAL_ONLY,true)
这个工作得很好:
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)
2021 Kotlin解决方案与新版本的Fragment:
dependencies {
implementation "androidx.fragment:fragment:1.3.3"
}
class YourFragment : Fragment() {
private val fileChooserContract = registerForActivityResult(ActivityResultContracts.GetContent()) { imageUri ->
if (imageUri != null) {
// imageUri now contains URI to selected image
}
}
// ...
fun openFileChooser() {
fileChooserContract.launch("image/*")
}
}
OnActivityResult方法已弃用
val singleImageResultLauncher =
registerForActivityResult(ActivityResultContracts.StartActivityForResult()) { result ->
if (result.resultCode == Activity.RESULT_OK) {
// There are no request codes
val data: Intent? = result.data
val selectedImageUri: Uri? = data?.data
if (null != selectedImageUri) {
// Get the path from the Uri
val path = getPathFromURI(selectedImageUri)
findViewById<TextView>(R.id.textView).text = path
findViewById<ImageView>(R.id.imageView2).setImageURI(selectedImageUri)
}
}
}
findViewById<Button>(R.id.oneImageSelectBtn).setOnClickListener {
val intent = Intent()
intent.type = "image/*"
intent.action = Intent.ACTION_GET_CONTENT
intent.putExtra(Intent.EXTRA_ALLOW_MULTIPLE, false)
singleImageResultLauncher.launch(Intent.createChooser(intent, "Select Picture"))
}
private fun getPathFromURI(uri: Uri?): String {
var path = ""
if (contentResolver != null) {
val cursor = contentResolver.query(uri!!, null, null, null, null)
if (cursor != null) {
cursor.moveToFirst()
val idx = cursor.getColumnIndex(MediaStore.Images.ImageColumns.DISPLAY_NAME)
path = cursor.getString(idx)
cursor.close()
}
}
return path
}
再见startActivityForResult ()
现在AndroidX活动的正确方法是活动结果api,这是谷歌强烈推荐的方法
private val selectImageFromGalleryResult = registerForActivityResult(ActivityResultContracts.GetContent()) { uri: Uri? ->
uri?.let { previewImage.setImageURI(uri) }
}
需要时只需调用selectImageFromGallery()
private fun selectImageFromGallery() = selectImageFromGalleryResult.launch("image/*")
感谢mklkj。
这是一个活动版本。
fileChooserContract可以选择一个图像。 filesChooserContract可以选择多张图片。
class MainActivity : AppCompatActivity() {
companion object {
private const val TAG = "MainActivity"
}
lateinit var viewBinding: ActivityMainBinding
private val fileChooserContract = registerForActivityResult(ActivityResultContracts.GetContent()) { uri ->
Log.d(TAG, "onActivityResult: uri $uri")
}
private val filesChooserContract = registerForActivityResult(ActivityResultContracts.GetMultipleContents()) { uriList ->
for (uri in uriList) {
Log.d(TAG, "onActivityResult: uri $uri")
}
}
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
viewBinding = ActivityMainBinding.inflate(layoutInflater)
setContentView(viewBinding.root)
viewBinding.btnPick.setOnClickListener {
fileChooserContract.launch("image/*")
}
viewBinding.btnPickMulti.setOnClickListener {
filesChooserContract.launch("image/*")
}
}
}