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

Question

1. MainActivity有一个列表视图和编辑按钮。单击"编辑"按钮后，将跳转到"编辑AddItem"页面。

2. EditAddItem类有一个编辑文本和按钮，每次我在编辑文本上键入内容，然后单击"保存"时，数据都会传递到MainActivity，并显示在列表视图中。有人能给我一些建议吗？

   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

基本上您的逻辑是切换的。您应该从MainActivity中startActivityForResult，并以EditAddItemActiity的结果结束。然后在MainActivity中，您应该覆盖onActivityResult以获取从EditAddItemActivity传递的文本。

你应该这样做：

主要活动.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);
}
}

编辑AddItem.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 2

在第一个活动中覆盖onActivityResult((，您需要正确实现将数据作为捆绑包从第二个活动中传递，并获取数据、更新列表和调用notify data change。

Answer 3

在您的MainActivity中(与您有ListView的活动相同(-

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活动中(编辑文本活动(-

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();
}
}
});