使用我的editText，我想从数组列表中查看保存的项目列表，并显示有关该项目的几行详细信息

Question

i have EditText and two buttons(SAVE & EDIT). how do i use the edittext to list a list of item which i want to create in a ArrayList. the edittext will give me the stored items, save button will give me the opportunity to save any item i want to save in the array and edit button will give me the opportunity to update existing item. thanks a lot for your effort. here is the MainActivity code..

Button btnSave, btnEdit;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    btnSave= (Button) findViewById(R.id.buttonSave);
    btnEdit= (Button) findViewById(R.id.buttonEdit);

    btnSave.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Intent intent= new Intent(MainActivity.this, InsertItem.class);
            startActivity(intent);
        }
    });

    btnEdit.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Intent intent= new Intent(MainActivity.this, UpdateItem.class);
            startActivity(intent);
        }
    });

}

}

This is updateActivity..

Button btnUpdate;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    getSupportActionBar().setDisplayHomeAsUpEnabled(true);
    setContentView(R.layout.activity_update_item);


    btnUpdate=findViewById(R.id.buttonUpdate);
    btnUpdate.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Toast.makeText(UpdateItem.this,"Update Item",Toast.LENGTH_LONG).show();
        }
    });
}

}

SaveActivity code....

Button btnApply;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    getSupportActionBar().setDisplayHomeAsUpEnabled(true);
    setContentView(R.layout.activity_insert_item);




    btnApply= findViewById(R.id.buttonApply);
    btnApply.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Toast.makeText(InsertItem.this,"Item Inserted",Toast.LENGTH_LONG).show();
        }
    });
}

}

Answer 1

I'm not exactly sure what do you mean by saying "use the EditText to list a list of items", but you're probably looking for AutoCompleteTextView , where you can set your array of items in an adapter and then display them in a list form.

You can then modify the ArrayList by putting a new item or getting the item you want to edit by using OnItemClickListener .

EDIT:

For inserting an item

btnSave.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            arrayList.add(valueFromEditText); // add element to arrayList
            adapter.notifyDataSetChanged(); // refresh the adapter
        }
    });

Hope I could help you somehow :)