Question

MainActivity具有一个列表视图和编辑按钮。单击“编辑”按钮后，它会跳到EditAddItem页面。

EditAddItem类具有一个编辑文本和按钮，每次当我在编辑文本上键入内容，然后单击“保存”时，数据将传递到MainActivity并显示在列表视图中。有人可以给我一些提示吗？

protected void onCreate(Bundle savedInstanceState) {//This is code part of EditAddItem Class
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_edit_add_item);
 editText = (EditText)findViewById(R.id.editTextTextPersonName);
 button = (Button) findViewById(R.id.button);
 cancelButton = (Button) findViewById(R.id.cancel);

 button.setOnClickListener(new View.OnClickListener() {
     @Override
     public void onClick(View view) {
         Intent intent = new Intent(EditAddItem.this, MainActivity.class);
         intent.putExtra("text", editText.getText().toString());
         startActivityForResult(intent, 0);

     }

 });

      protected void onCreate(Bundle savedInstanceState) {//Code part of MainActivity
     super.onCreate(savedInstanceState);
     setContentView(R.layout.activity_main);
     button = (Button)findViewById(R.id.btnAddItem);
     listView = (ListView) findViewById(R.id.lstView);
     addItemEditText = (EditText)findViewById(R.id.editTextTextPersonName);
     items = new ArrayList<String>();
     items.add("item one");
     items.add("item two");


     itemsAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, items);

     listView.setAdapter(itemsAdapter);


     button.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            openEditItemView();
        }
    });

Answer 1

在第一个活动中覆盖onActivityResult（），您需要正确地实现从第二个活动中作为捆绑传递数据的方式，并获取数据并更新列表并调用通知数据更改。

Answer 2

基本上，您的逻辑已切换。您应该startActivityForResult来自MainActivity并完成EditAddItemActiity的结果。然后，在MainActivity中，您应该覆盖onActivityResult才能从EditAddItemActivity传递文本。

您应该执行以下操作：

MainActivity.java

    public static final int EDIT_ADD_ITEM_REQUEST = 1;
    public static final String EXTRA_EDIT_ADD_ITEM = "EXTRA_EDIT_ADD_ITEM";

protected void onCreate(Bundle savedInstanceState) {//Code part of MainActivity
     super.onCreate(savedInstanceState);
     setContentView(R.layout.activity_main);
     button = (Button)findViewById(R.id.btnAddItem);
     listView = (ListView) findViewById(R.id.lstView);
     addItemEditText = (EditText)findViewById(R.id.editTextTextPersonName);
     items = new ArrayList<String>();
     items.add("item one");
     items.add("item two");


     itemsAdapter = new ArrayAdapter<String(this,android.R.layout.simple_list_item_1, items);

     listView.setAdapter(itemsAdapter);


     button.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Intent intent = new Intent(this, EditAddItem.class);
            startActivityForResult(intent, EDIT_ADD_ITEM_RESULT);
        }
    });

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if(resultCode == Activity.RESULT_OK) {
            if(requestCode == EDIT_ADD_ITEM_REQUEST) {
                String name = data.getStringExtra(EXTRA_EDIT_ADD_ITEM);
                updateList(name);
            }
        }
    }

    private void updateList(String name) {
        itemsAdapter.add(name);
    }
}

EditAddItem.java

protected void onCreate(Bundle savedInstanceState) {//This is code part of EditAddItem Class
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_edit_add_item);
 editText = (EditText)findViewById(R.id.editTextTextPersonName);
 button = (Button) findViewById(R.id.button);
 cancelButton = (Button) findViewById(R.id.cancel);

 button.setOnClickListener(new View.OnClickListener() {
     @Override
     public void onClick(View view) {
         Intent resultIntent = new Intent();
                resultIntent.putExtra(MainActivity.EXTRA_EDIT_ADD_ITEM, editText.getText().toString());
                setResult(Activity.RESULT_OK, resultIntent);
                finish();

     }

 });

Answer 3

在您的MainActivity中（具有ListView的同一活动）-

        editButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Intent intent = new Intent(MainActivity.this, EditAddItem.class);
            startActivityForResult(intent, 0);
        }
    });

// also override below method

@Override
    protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    if(resultCode ==0 && resultCode== RESULT_OK && data != null)
    {

        Sting editTextContent = data.getStringExtra("editText"); // your data
        
        //now put data into your ListView
        items = new ArrayList<String>();
        items.add(editTextContent);
        
        itemsAdapter = new ArrayAdapter<String>(this, 
                    android.R.layout.simple_list_item_1, items);

        listView.setAdapter(itemsAdapter);

    }
}

在您的EditAddItem活动（editText活动）中-

button.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View view) {
        if(!TextUtils.isEmpty(editText.getText().toString()))
        {
            Intent resultIntent = new Intent();
            resultIntent.putExtra("editText", editText.getText().toString());
            setResult(Activity.RESULT_OK, resultIntent);
            finish();
        } else
        { 
           Toast.makeText(this, "EditText is empty!", Toast.LENGTH_SHORT).show();
        }
    }
});

如何将多个数据从EditText（主活动）传递到ListView（另一个活动）

3 个答案: