System share support

mastodon/src/main/java/org/joinmastodon/android/ExternalShareActivity.java

@@ -0,0 +1,94 @@
+package org.joinmastodon.android;
+
+import android.app.Fragment;
+import android.content.ClipData;
+import android.content.DialogInterface;
+import android.content.Intent;
+import android.graphics.drawable.ColorDrawable;
+import android.net.Uri;
+import android.os.Bundle;
+import android.text.TextUtils;
+import android.widget.Toast;
+
+import org.joinmastodon.android.api.session.AccountSession;
+import org.joinmastodon.android.api.session.AccountSessionManager;
+import org.joinmastodon.android.fragments.ComposeFragment;
+import org.joinmastodon.android.ui.M3AlertDialogBuilder;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+import java.util.stream.Collectors;
+
+import androidx.annotation.Nullable;
+import me.grishka.appkit.FragmentStackActivity;
+
+public class ExternalShareActivity extends FragmentStackActivity{
+	@Override
+	protected void onCreate(@Nullable Bundle savedInstanceState){
+		super.onCreate(savedInstanceState);
+		if(savedInstanceState==null){
+			List<AccountSession> sessions=AccountSessionManager.getInstance().getLoggedInAccounts();
+			if(sessions.isEmpty()){
+				Toast.makeText(this, R.string.err_not_logged_in, Toast.LENGTH_SHORT).show();
+				finish();
+			}else if(sessions.size()==1){
+				openComposeFragment(sessions.get(0).getID());
+			}else{
+				getWindow().setBackgroundDrawable(new ColorDrawable(0xff000000));
+				new M3AlertDialogBuilder(this)
+						.setItems(sessions.stream().map(as->"@"+as.self.username+"@"+as.domain).toArray(String[]::new), (dialog, which)->{
+							openComposeFragment(sessions.get(which).getID());
+						})
+						.setTitle(R.string.choose_account)
+						.setOnCancelListener(dialog -> finish())
+						.show();
+			}
+		}
+	}
+
+	private void openComposeFragment(String accountID){
+		getWindow().setBackgroundDrawable(null);
+
+		Intent intent=getIntent();
+		String text=intent.getStringExtra(Intent.EXTRA_TEXT);
+		List<Uri> mediaUris;
+		if(Intent.ACTION_SEND.equals(intent.getAction())){
+			Uri singleUri=intent.getParcelableExtra(Intent.EXTRA_STREAM);
+			mediaUris=singleUri!=null ? Collections.singletonList(singleUri) : null;
+		}else if(Intent.ACTION_SEND_MULTIPLE.equals(intent.getAction())){
+			ClipData clipData=intent.getClipData();
+			if(clipData!=null){
+				mediaUris=new ArrayList<>(clipData.getItemCount());
+				for(int i=0;i<clipData.getItemCount();i++){
+					ClipData.Item item=clipData.getItemAt(i);
+					mediaUris.add(item.getUri());
+				}
+			}else{
+				mediaUris=null;
+			}
+		}else{
+			Toast.makeText(this, "Unexpected intent action: "+intent.getAction(), Toast.LENGTH_SHORT).show();
+			finish();
+			return;
+		}
+
+		Bundle args=new Bundle();
+		args.putString("account", accountID);
+		if(!TextUtils.isEmpty(text))
+			args.putString("prefilledText", text);
+		if(mediaUris!=null && !mediaUris.isEmpty())
+			args.putParcelableArrayList("mediaAttachments", toArrayList(mediaUris));
+		Fragment fragment=new ComposeFragment();
+		fragment.setArguments(args);
+		showFragmentClearingBackStack(fragment);
+	}
+
+	private static <T> ArrayList<T> toArrayList(List<T> l){
+		if(l instanceof ArrayList)
+			return (ArrayList<T>) l;
+		if(l==null)
+			return null;
+		return new ArrayList<>(l);
+	}
+}