当我尝试从recyclerview(完整图像活动)中删除项目时,我调用onfinish()
方法返回上一个活动,即recyclerview(GalleryActivity)
。
但我删除的图像仍然可见,当我退出图库活动并再次输入时,它会刷新。
任何解决方案,以便在删除项目时可以刷新。When i delete an image this thing appears
这是我的Recyclerview适配器
公共类RecyclerViewAdapter扩展了RecyclerView.Adapter {
private ArrayList<String> yeniliste;
private Context context;
public RecyclerViewAdapter(Context context, ArrayList<String> itemList) {
this.yeniliste = itemList;
this.context = context;
}
@Override
public RecyclerViewHolders onCreateViewHolder(ViewGroup parent, int viewType) {
View layoutView = LayoutInflater.from(parent.getContext()).inflate(R.layout.gallery_item, null);
RecyclerViewHolders rcv = new RecyclerViewHolders(layoutView);
return rcv;
}
@Override
public void onBindViewHolder(final RecyclerViewHolders holder, final int position) {
Bitmap bitmap = BitmapFactory.decodeFile(yeniliste.get(position));
holder.countryPhoto.setImageBitmap(bitmap);
holder.countryPhoto.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(v.getContext(),GalleryFullImage.class);
intent.putExtra("realid",String.valueOf(holder.getAdapterPosition()));
v.getContext().startActivity(intent);
}
});
}
@Override
public int getItemCount() {
return this.yeniliste.size();
}
public static class RecyclerViewHolders extends RecyclerView.ViewHolder implements View.OnClickListener{
public ImageView countryPhoto;
public RecyclerViewHolders(View itemView) {
super(itemView);
countryPhoto = (ImageView)itemView.findViewById(R.id.country_photo);
}
@Override
public void onClick(View view) {
Toast.makeText(view.getContext(), "Clicked Country Position = " + getAdapterPosition(), Toast.LENGTH_SHORT).show();
}
}
public void removeItem(int position)
{
yeniliste.remove(position);
notifyItemRemoved(position);
notifyItemRangeChanged(position, yeniliste.size());
}}
removeItem
方法也不起作用。
这是我的完整图像活动。当我从这里删除图像。它没有刷新GalleryActivity。
public class GalleryFullImage extends AppCompatActivity {
String idPath;
String realid;
ArrayList<String> stringList;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.gallery_fullimage);
stringList = new ArrayList<>();
String targetPath= Environment.getExternalStorageDirectory().getAbsolutePath() + "/My Images/";
File targetDirector = new File(targetPath);
File[] files = targetDirector.listFiles();
Arrays.sort( files, new Comparator()
{
public int compare(Object o1, Object o2) {
if (((File)o1).lastModified() > ((File)o2).lastModified()) {
return -1;
} else if (((File)o1).lastModified() < ((File)o2).lastModified()) {
return +1;
} else {
return 0;
}
}
});
for (File file : files){
stringList.add(file.getAbsolutePath());
}
Intent i = getIntent();
idPath = i.getStringExtra("realid");
realid = stringList.get(Integer.parseInt(idPath));
Log.d("wow",realid);
File imgFile = new File(realid);
if(imgFile.exists()) {
Bitmap myBitmap = BitmapFactory.decodeFile(imgFile.getAbsolutePath());
ImageView myImage = (ImageView) findViewById(R.id.gallery_fullimg);
myImage.setImageBitmap(myBitmap);
myImage.setOnTouchListener(new ImageMatrixTouchHandler(getApplicationContext()));
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.delete, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
final int id = item.getItemId();
if (id == R.id.action_delete) {
AlertDialog.Builder alertDialog = new AlertDialog.Builder(GalleryFullImage.this);
alertDialog.setTitle("Confirm Delete...");
alertDialog.setMessage("Are you sure you want delete this?");
alertDialog.setPositiveButton("YES", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,int which) {
RecyclerViewAdapter rcAdapter = new RecyclerViewAdapter(getApplicationContext(), stringList);
rcAdapter.removeItem(Integer.parseInt(idPath));
File file = new File(realid);
boolean deleted = file.delete();
Log.v("log_tag","deleted: " + deleted);
Toast.makeText(GalleryFullImage.this,"File Deleted", Toast.LENGTH_SHORT).show();
finish();
}
});
alertDialog.setNegativeButton("NO", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
Toast.makeText(getApplicationContext(), "You clicked on NO", Toast.LENGTH_SHORT).show();
dialog.cancel();
}
});
alertDialog.show();
return true;
}
return super.onOptionsItemSelected(item);
}}
这是GalleryActivity
public class GalleryActivity extends AppCompatActivity {
ArrayList<String> stringList;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_gallery);
setTitle("Gallery");
stringList = new ArrayList<>();
String targetPath= Environment.getExternalStorageDirectory().getAbsolutePath() + "/My Images/";
File targetDirector = new File(targetPath);
File[] files = targetDirector.listFiles();
Arrays.sort( files, new Comparator()
{
public int compare(Object o1, Object o2) {
if (((File)o1).lastModified() > ((File)o2).lastModified()) {
return -1;
} else if (((File)o1).lastModified() < ((File)o2).lastModified()) {
return +1;
} else {
return 0;
}
}
});
for (File file : files){
stringList.add(file.getAbsolutePath());
}
RecyclerView rView = (RecyclerView)findViewById(R.id.recycler_view);
RecyclerView.LayoutManager layoutManager = new GridLayoutManager(getApplicationContext(),2);
rView.setHasFixedSize(true);
rView.setLayoutManager(layoutManager);
RecyclerViewAdapter rcAdapter = new RecyclerViewAdapter(getApplicationContext(), stringList);
rView.setAdapter(rcAdapter);
}
@Override
protected void onResume() {
super.onResume();
}}
答案 0 :(得分:1)
在GalleryActivity中执行此操作
@Override
protected void onResume() {
super.onResume();
if(rView != null){
yourAdapter.notifyDataSetChanged();
}
};
制作rView和适配器全局变量。
答案 1 :(得分:0)
在setImage()方法中设置代码,就像在onCreate和onResume中调用此方法一样: -
public class TestProgram {
public static void main(String[] args) {
TestProgram test = new TestProgram();
test.draw(15, 4);
}
public void draw(int x, int y) {
// System.out.println(".");
System.out.println();
int i = 0;
int j = 0;
for (i = 0; i < x; i++) {
System.out.print(".");
// continue;
}
for (j = x; j > y; j--) {
System.out.println(".");
System.out.print("\t\t");
System.out.println(".");
}
for (int k = 0; k <= x; k++) {
System.out.print(".");
}
}
}
希望这是有帮助的;