java - 从图库中获取所有图像并存储在数组中
问题描述
我有为图像定义的代码(可绘制)意味着图像已经定义,但我希望用户从图库中选择图像。所以首先我想从图库中获取所有图像,然后将其显示在视图中,并且他们的用户可以选择 Image 。
所以这意味着所有图像必须保存在数组中,如下所示。任何帮助。
public class StickerSelectActivity extends AppCompatActivity {
public static final String EXTRA_STICKER_ID = "extra_sticker_id";
private final int[] stickerIds = {
R.drawable.abra,
R.drawable.bellsprout,
R.drawable.bracelet,
R.drawable.bullbasaur,
R.drawable.camera,
R.drawable.candy,
R.drawable.caterpie,
R.drawable.charmander,
R.drawable.mankey,
R.drawable.map,
R.drawable.mega_ball,
R.drawable.meowth,
R.drawable.pawprints,
R.drawable.pidgey,
R.drawable.pikachu,
R.drawable.pikachu_1,
R.drawable.pikachu_2,
R.drawable.player,
R.drawable.pointer,
R.drawable.pokebag,
R.drawable.pokeball,
R.drawable.pokeballs,
R.drawable.pokecoin,
R.drawable.pokedex,
R.drawable.potion,
R.drawable.psyduck,
R.drawable.rattata,
R.drawable.revive,
R.drawable.squirtle,
R.drawable.star,
R.drawable.star_1,
R.drawable.superball,
R.drawable.tornado,
R.drawable.venonat,
R.drawable.weedle,
R.drawable.zubat
};
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.select_sticker_activity);
//noinspection ConstantConditions
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
RecyclerView recyclerView = (RecyclerView) findViewById(R.id.stickers_recycler_view);
GridLayoutManager glm = new GridLayoutManager(this, 3);
recyclerView.setLayoutManager(glm);
List<Integer> stickers = new ArrayList<>(stickerIds.length);
for (Integer id : stickerIds) {
stickers.add(id);
}
recyclerView.setAdapter(new StickersAdapter(stickers, this));
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
if (item.getItemId() == android.R.id.home) {
onBackPressed();
return true;
}
return super.onOptionsItemSelected(item);
}
private void onStickerSelected(int stickerId) {
Intent intent = new Intent();
intent.putExtra(EXTRA_STICKER_ID, stickerId);
setResult(RESULT_OK, intent);
finish();
}
class StickersAdapter extends RecyclerView.Adapter<StickersAdapter.StickerViewHolder> {
private final List<Integer> stickerIds;
private final Context context;
private final LayoutInflater layoutInflater;
StickersAdapter(@NonNull List<Integer> stickerIds, @NonNull Context context) {
this.stickerIds = stickerIds;
this.context = context;
this.layoutInflater = LayoutInflater.from(context);
}
@Override
public StickerViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
return new StickerViewHolder(layoutInflater.inflate(R.layout.sticker_item, parent, false));
}
@Override
public void onBindViewHolder(StickerViewHolder holder, int position) {
holder.image.setImageDrawable(ContextCompat.getDrawable(context, getItem(position)));
}
@Override
public int getItemCount() {
return stickerIds.size();
}
private int getItem(int position) {
return stickerIds.get(position);
}
class StickerViewHolder extends RecyclerView.ViewHolder {
ImageView image;
StickerViewHolder(View itemView) {
super(itemView);
image = (ImageView) itemView.findViewById(R.id.sticker_image);
itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
int pos = getAdapterPosition();
if (pos >= 0) { // might be NO_POSITION
onStickerSelected(getItem(pos));
}
}
});
}
}
}
}
解决方案
如果您想在应用程序的图库中显示所有可用图像,则不需要。您可以使用
private Cursor cc = null;
cc = this.getContentResolver().query(
MediaStore.Images.Media.EXTERNAL_CONTENT_URI, null, null, null,
null)
这将为您提供与图库中可用文件的连接。更详细的答案在这里
如何在 android 的 Gridview 中实现图片库?
如果在您的应用程序中,您有一个图像视图并且您希望您的用户单击图像,然后 Android 应该询问他们是否要从图库/相机中选择图像,您可以按照此操作,您可以在 setOnClickListener 上调用 selectImage 方法图像视图。
private void selectImage() {
final CharSequence[] items = { "Take Photo", "Choose from Library" };
AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
builder.setTitle("Update Profile Photograph");
builder.setItems(items, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int item) {
boolean result = Utility.checkPermission(getActivity());
if (items[item].equals("Take Photo")) {
if(result)
cameraIntent();
} else if (items[item].equals("Choose from Library")) {
if(result)
galleryIntent();
}
}
});
builder.show();
}
private void cameraIntent() {
Intent takePicture = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
File out = Environment.getExternalStorageDirectory();
out = new File(out, familyMemberId + ".png");
Uri photoURI = FileProvider.getUriForFile(getContext(), getContext().getPackageName() + ".app.provider", out);
takePicture.putExtra(MediaStore.EXTRA_OUTPUT, photoURI);
startActivityForResult(takePicture, 0);
}
private void galleryIntent() {
Intent pickPhoto = new Intent(Intent.ACTION_PICK,
android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
startActivityForResult(pickPhoto , 1);//one can be replaced with any action code
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent imageReturnedIntent) {
super.onActivityResult(requestCode, resultCode, imageReturnedIntent);
switch(requestCode) {
case 0:
if(resultCode == Activity.RESULT_OK){
File out = Environment.getExternalStorageDirectory();
out = new File(out, familyMemberId + ".png");
Uri photoURI = FileProvider.getUriForFile(getContext(), getContext().getPackageName() + ".app.provider", out);
Toast.makeText(getContext(), photoURI.toString(), Toast.LENGTH_LONG).show();
imageUri = photoURI.toString();
Glide.with(this).load(imageUri).into(familyMemberProfilePick);
}
break;
case 1:
if(resultCode == Activity.RESULT_OK){
Uri selectedImage = imageReturnedIntent.getData();
imageUri = selectedImage.toString();
Glide.with(this).load(imageUri).into(familyMemberProfilePick);
}
break;
}
}
请不要忘记添加这些
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<application ...
<provider
android:name=".utility.GenericFileProvider"
android:authorities="${applicationId}.app.provider"
android:exported="false"
android:grantUriPermissions="true">
<meta-data
android:name="android.support.FILE_PROVIDER_PATHS"
android:resource="@xml/provider_paths"/>
</provider>
....
</application>
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