所以我有这个问题在我的android项目中通过2个活动传递数据，我不知道我做错了什么病我试着以简单的方式解释我的问题。我有2个活动，我想将2个不同的值传递给不同的活动。我做了这个
1活动：
public class Linhas_pesagem extends ListActivity {
// Progress Dialog
private ProgressDialog pDialog;
ListAdapter adapter;
String id2;
// Creating JSON Parser object
JSONParser jParser = new JSONParser();
ArrayList<HashMap<String, String>> productsList;
// url to get all products list
private static String url_all_products = "http://10.0.2.2/webprojecto4/ler_linha_doc.php";
// url to get all products list
private static String url_delete_products = "http://10.0.2.2/webprojecto4/eliminar_linha.php";
// JSON Node names
private static final String TAG_SUCCESS = "success";
private static final String TAG_PRODUCTS = "lin_doc";
private static final String TAG_ID = "id";
private static final String TAG_ESTAB = "estab";
private static final String TAG_DATA = "dt";
private static final String TAG_HORA = "hr";
private static final String TAG_QTD = "quantidade";
// products JSONArray
JSONArray products = null;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.all_lin_products);
Intent i = getIntent();
// getting product id (pid) from intent
id2 = i.getStringExtra(TAG_ID);
// Create button
Button btnCreateProduct = (Button) findViewById(R.id.button1);
// button click event
btnCreateProduct.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
// creating new product in background thread
Intent in = new Intent(getApplicationContext(),
Newlin_ProductActivity.class);
in.putExtra(TAG_ID, id2);
startActivity(in);
}
});
// Hashmap for ListView
productsList = new ArrayList<HashMap<String, String>>();
// Loading products in Background Thread
new LoadAllProducts().execute();
// Get listview
ListView lv = getListView();
registerForContextMenu(lv);
// on seleting single product
// launching Edit Product Screen
// on seleting single product
// launching Edit Product Screen
}
// Response from Edit Product Activity
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
// if result code 100
if (resultCode == 100) {
// if result code 100 is received
// means user edited/deleted product
// reload this screen again
Intent intent = getIntent();
finish();
startActivity(intent);
}
}
/**
* Background Async Task to Load all product by making HTTP Request
* */
class LoadAllProducts extends AsyncTask<String, String, String> {
/**
* Before starting background thread Show Progress Dialog
* */
@Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(Linhas_pesagem.this);
pDialog.setMessage("Loading products. Please wait...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(false);
pDialog.show();
}
/**
* getting All products from url
* */
protected String doInBackground(String... args) {
// Building Parameters
try {
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("id", id2));
// getting JSON string from URL
JSONObject json = jParser.makeHttpRequest(url_all_products, "POST", params);
// Check your log cat for JSON reponse
Log.d("All Products: ", json.toString());
// Checking for SUCCESS TAG
int success = json.getInt(TAG_SUCCESS);
if (success == 1) {
// products found
// Getting Array of Products
products = json.getJSONArray(TAG_PRODUCTS);
// looping through All Products
for (int i = 0; i < products.length(); i++) {
JSONObject c = products.getJSONObject(i);
// Storing each json item in variable
String id = c.getString(TAG_ID);
String id_estab = c.getString(TAG_ESTAB);
String dt = c.getString(TAG_DATA);
String hr = c.getString(TAG_HORA);
String quantidade = c.getString(TAG_QTD);
// creating new HashMap
HashMap<String, String> map = new HashMap<String, String>();
// adding each child node to HashMap key => value
map.put(TAG_ID, id);
map.put(TAG_ESTAB, id_estab);
map.put(TAG_DATA, dt);
map.put(TAG_HORA, hr);
map.put(TAG_QTD, quantidade);
// adding HashList to ArrayList
productsList.add(map);
}
} else {
// no products found
// Launch Add New product Activity
Intent i = new Intent(getApplicationContext(),
Newlin_ProductActivity.class);
// Closing all previous activities
i.putExtra(TAG_ID, id2);
i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(i);
}
} catch (JSONException e) {
e.printStackTrace();
}
return null;
}
/**
* After completing background task Dismiss the progress dialog
* **/
protected void onPostExecute(String file_url) {
// dismiss the dialog after getting all products
pDialog.dismiss();
// updating UI from Background Thread
runOnUiThread(new Runnable() {
public void run() {
/**
* Updating parsed JSON data into ListView
* */
adapter = new SimpleAdapter(
Linhas_pesagem.this, productsList,
R.layout.list_lin_items, new String[] { TAG_ID,
TAG_ESTAB, TAG_DATA, TAG_HORA, TAG_QTD},
new int[] { R.id.id, R.id.id_estab, R.id.dt, R.id.hr, R.id.quantidade});
// updating listview
setListAdapter(adapter);
EditText inputSearch = (EditText)findViewById(R.id.editText1);
/**
* Enabling Search Filter
* */
inputSearch.addTextChangedListener(new TextWatcher() {
@Override
public void onTextChanged(CharSequence cs, int arg1, int arg2, int arg3) {
// When user changed the Text
((SimpleAdapter) Linhas_pesagem.this.adapter).getFilter().filter(cs);
}
@Override
public void beforeTextChanged(CharSequence arg0, int arg1, int arg2,
int arg3) {
// TODO Auto-generated method stub
}
@Override
public void afterTextChanged(Editable arg0) {
// TODO Auto-generated method stub
}
});
}
});
}
}
/*****************************************************************
* Background Async Task to Delete Product
* */
class DeleteProduct extends AsyncTask<String, String, String> {
/**
* Before starting background thread Show Progress Dialog
* */
@Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(Linhas_pesagem.this);
pDialog.setMessage("Deleting Product...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(true);
pDialog.show();
}
/**
* Deleting product
* */
protected String doInBackground(String... args) {
String id = args[0];
// Check for success tag
int success;
try {
// Building Parameters
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("id", id));
// getting product details by making HTTP request
JSONObject json = jParser.makeHttpRequest(
url_delete_products, "POST", params);
// check your log for json response
Log.d("Delete Product", json.toString());
// json success tag
success = json.getInt(TAG_SUCCESS);
if (success == 1) {
// product successfully deleted
// notify previous activity by sending code 100
Intent i = getIntent();
// send result code 100 to notify about product deletion
setResult(100, i);
finish();
}
} catch (JSONException e) {
e.printStackTrace();
}
return null;
}
/**
* After completing background task Dismiss the progress dialog
* **/
protected void onPostExecute(String file_url) {
// dismiss the dialog once product deleted
pDialog.dismiss();
}
}
@Override
public void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo){
getMenuInflater().inflate(R.menu.context, menu);
}
public boolean onContextItemSelected(MenuItem item) {
AdapterContextMenuInfo info = (AdapterContextMenuInfo) item.getMenuInfo();
switch(item.getItemId()) {
case R.id.item1:
HashMap <String, String> product2 = productsList.get(info.position);
String id9 = product2.get("id");
String id3 = product2.get(TAG_DATA);
String id4 = product2.get(TAG_ESTAB);
String id5 = product2.get(TAG_HORA);
String id6 = product2.get(TAG_QTD);
Intent in = new Intent(this,
Edit_linha_prod.class);
in.putExtra("id", id9);
in.putExtra(TAG_DATA, id3);
in.putExtra(TAG_HORA, id5);
in.putExtra(TAG_ESTAB, id4);
in.putExtra(TAG_QTD, id6);
in.putExtra("TAG_ID", id2);
Toast.makeText(getApplicationContext(), id9,
Toast.LENGTH_LONG).show();
Toast.makeText(getApplicationContext(), id2,
Toast.LENGTH_LONG).show();
startActivity(in);
// sending pid to next activity
return true;
case R.id.item2:
HashMap <String, String> product = productsList.get(info.position);
String id = product.get(TAG_ID);
// Starting new intent
new DeleteProduct().execute(id);
Intent in3 = new Intent(getApplicationContext(),
Linhas_pesagem.class);
in3.putExtra(TAG_ID, id2);
Toast.makeText(getApplicationContext(), id2,
Toast.LENGTH_LONG).show();
startActivity(in3);
return true;
default:
return super.onContextItemSelected(item);
}
}
}
2活动：
public class Edit_linha_prod extends Activity {
EditText inputdtestab;
EditText inputdata;
EditText inputhora;
EditText quantidade;
Button btnSave;
String id9;
String id3;
String id4;
String id5;
String id6;
String id2;
// Progress Dialog
private ProgressDialog pDialog;
// JSON parser class
JSONParser jsonParser = new JSONParser();
// url to update product
private static final String url_update_product = "http://10.0.2.2/webprojecto4/actualizar_linha.php";
// JSON Node names
private static final String TAG_SUCCESS = "success";
private static final String TAG_PRODUCT = "lin_doc";
private static final String TAG_ID = "id";
private static final String TAG_ESTAB = "estab";
private static final String TAG_DATA = "dt";
private static final String TAG_HORA = "hr";
private static final String TAG_QTD = "quantidade";
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.edit_linha);
// save button
btnSave = (Button) findViewById(R.id.button1);
// getting product details from intent
Intent i = getIntent();
// getting product id (pid) from intent
id9 = i.getStringExtra("id");
id3 = i.getStringExtra(TAG_DATA);
id4 = i.getStringExtra(TAG_ESTAB);
id5 = i.getStringExtra(TAG_HORA);
id6 = i.getStringExtra(TAG_QTD);
id2= i.getStringExtra(TAG_ID);
Toast.makeText(getApplicationContext(), id9,
Toast.LENGTH_LONG).show();
Toast.makeText(getApplicationContext(), id2,
Toast.LENGTH_LONG).show();
inputdata = (EditText) findViewById(R.id.editdata);
inputdtestab = (EditText) findViewById(R.id.editestab);
inputhora = (EditText) findViewById(R.id.edithora);
quantidade = (EditText) findViewById(R.id.editquantidade);
// display product data in EditText
inputdata.setText(id3);
inputdtestab.setText(id4);
inputhora.setText(id5);
quantidade.setText(id6);
// Getting complete product details in background thread
// save button click event
btnSave.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
// starting background task to update product
new SaveProductDetails().execute();
}
});
}
/**
* Background Async Task to Save product Details
* */
class SaveProductDetails extends AsyncTask<String, String, String> {
/**
* Before starting background thread Show Progress Dialog
* */
@Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(Edit_linha_prod.this);
pDialog.setMessage("Saving product ...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(true);
pDialog.show();
}
/**
* Saving product
* */
protected String doInBackground(String... args) {
// getting updated data from EditTexts
String data = inputdata.getText().toString();
String estab = inputdtestab.getText().toString();
String hora = inputhora.getText().toString();
String quantidades = quantidade.getText().toString();
// Building Parameters
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("id", id9));
params.add(new BasicNameValuePair("id_produto", "00000"));
params.add(new BasicNameValuePair("id_tipo_produto", "00"));
params.add(new BasicNameValuePair("id_estab", estab));
params.add(new BasicNameValuePair("quantidade", quantidades));//ir buscar criar
params.add(new BasicNameValuePair("dt", data));
params.add(new BasicNameValuePair("hr", hora));
// sending modified data through http request
// Notice that update product url accepts POST method
JSONObject json = jsonParser.makeHttpRequest(url_update_product,
"POST", params);
// check json success tag
try {
int success = json.getInt(TAG_SUCCESS);
if (success == 1) {
// successfully updated
Intent i = getIntent();
Intent i2 = new Intent(getApplicationContext(), Linhas_pesagem.class);
i2.putExtra("TAG_ID", id2);
startActivity(i2);
// send result code 100 to notify about product update
setResult(100, i);
finish();
} else {
// failed to update product
}
} catch (JSONException e) {
e.printStackTrace();
}
return null;
}
/**
* After completing background task Dismiss the progress dialog
* **/
protected void onPostExecute(String file_url) {
// dismiss the dialog once product uupdated
pDialog.dismiss();
}
}
}
所以在我的1活动中，我在上下文菜单项1中传递了我想要id9和id2的值，香港专业教育学院敬酒，看看他们传递了什么值，并且他们传递了我想要的方式637和8
public boolean onContextItemSelected(MenuItem item) {
AdapterContextMenuInfo info = (AdapterContextMenuInfo) item.getMenuInfo();
switch(item.getItemId()) {
case R.id.item1:
HashMap <String, String> product2 = productsList.get(info.position);
String id9 = product2.get("id");
String id3 = product2.get(TAG_DATA);
String id4 = product2.get(TAG_ESTAB);
String id5 = product2.get(TAG_HORA);
String id6 = product2.get(TAG_QTD);
Intent in = new Intent(this,
Edit_linha_prod.class);
in.putExtra("id", id9);
in.putExtra(TAG_DATA, id3);
in.putExtra(TAG_HORA, id5);
in.putExtra(TAG_ESTAB, id4);
in.putExtra(TAG_QTD, id6);
in.putExtra("TAG_ID", id2);
Toast.makeText(getApplicationContext(), id9,
Toast.LENGTH_LONG).show();
Toast.makeText(getApplicationContext(), id2,
Toast.LENGTH_LONG).show();
startActivity(in);
// sending pid to next activity
return true;
在我的2活动中，我得到了这两个变量的值，但它们是相同的637和637而不是637和8
Intent i = getIntent();
// getting product id (pid) from intent
id9 = i.getStringExtra("id");
id3 = i.getStringExtra(TAG_DATA);
id4 = i.getStringExtra(TAG_ESTAB);
id5 = i.getStringExtra(TAG_HORA);
id6 = i.getStringExtra(TAG_QTD);
id2= i.getStringExtra(TAG_ID);
Toast.makeText(getApplicationContext(), id9,
Toast.LENGTH_LONG).show();
Toast.makeText(getApplicationContext(), id2,
Toast.LENGTH_LONG).show();
答案 0 :(得分：0)
in.putExtra("id", id9);
in.putExtra(TAG_DATA, id3);
in.putExtra(TAG_HORA, id5);
in.putExtra(TAG_ESTAB, id4);
in.putExtra(TAG_QTD, id6);
in.putExtra("TAG_ID", id2);
看起来你已经存储了＆＃34; TAG_ID＆＃34;作为关键，而不是变量TAG_ID
答案 1 :(得分：0)
因为你对id9和id2使用相同的密钥，这是＆＃34; id＆＃34; （请注意，常量TAG_ID的值为＆＃34; id＆＃34;），因此只需确保您使用的所有键都不同。
所以你的活动1应该是这样的，（注意我删除了常量TAG_ID周围的引号）
in.putExtra("id9", id9);
in.putExtra(TAG_DATA, id3);
in.putExtra(TAG_HORA, id5);
in.putExtra(TAG_ESTAB, id4);
in.putExtra(TAG_QTD, id6);
in.putExtra(TAG_ID, id2);
和活动2：
id9 = i.getStringExtra("id9");
id3 = i.getStringExtra(TAG_DATA);
id4 = i.getStringExtra(TAG_ESTAB);
id5 = i.getStringExtra(TAG_HORA);
id6 = i.getStringExtra(TAG_QTD);
id2= i.getStringExtra(TAG_ID);