我在两个活动之间传递了两个字符串，由于一些奇怪的原因，字符串没有被传递。我已经完成了所有正确的协议，似乎没有任何工作，尽管在几个小时内修改代码，我确信这是一个简单的解决方案，但我不知道，有什么用。
第一课：
public class LogIn extends Activity implements OnClickListener {
Button ok, back, exit;
TextView result;
EditText pword;
String password;
EditText uname;
String username;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
// Login button clicked
ok = (Button) findViewById(R.id.btn_login);
ok.setOnClickListener(this);
result = (TextView) findViewById(R.id.lbl_result);
}
//create bracket.
public void postLoginData() {
uname = (EditText) findViewById(R.id.txt_username);
uname.getText().toString();
pword = (EditText) findViewById(R.id.txt_password);
pword.getText().toString();
Bundle basket = new Bundle();
basket.putString("keypass", password);
basket.putString("keyuname", username);
Intent a = new Intent(LogIn.this, ChatService.class );
a.putExtras(basket);
startActivity(a);
// Create a new HttpClient and Post Header
HttpClient httpclient = new DefaultHttpClient();
/* login.php returns true if username and password is equal to saranga */
HttpPost httppost = new HttpPost("http://gta5news.com/login.php");
try {
// Add user name and password
List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(2);
nameValuePairs.add(new BasicNameValuePair("username", username));
nameValuePairs.add(new BasicNameValuePair("password", password));
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
// Execute HTTP Post Request
Log.w("HttpPost(Login)", "Execute HTTP Post Request(Login 1)");
HttpResponse response = httpclient.execute(httppost);
String str = inputStreamToString(response.getEntity().getContent())
.toString();
Log.w("HttpPost", str);
if (str.toString().equalsIgnoreCase("true")) {
Log.w("HttpPost(Login2)", "TRUE");
result.setText("Login successful");
Intent login = new Intent(LogIn.this, ChatService.class);
startActivity(login);
}else {
Log.w("HttpPost(Login(3)", "FALSE");
result.setText(str);
}
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
private StringBuilder inputStreamToString(InputStream is) {
String line = "";
StringBuilder total = new StringBuilder();
// Wrap a BufferedReader around the InputStream
BufferedReader rd = new BufferedReader(new InputStreamReader(is));
// Read response until the end
try {
while ((line = rd.readLine()) != null) {
total.append(line);
}
} catch (IOException e) {
e.printStackTrace();
}
// Return full string
return total;
}
public void onClick(View view) {
if (view == ok) {
postLoginData();
InputMethodManager imm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
imm.hideSoftInputFromWindow(pword.getWindowToken(), 0);
}
// Click end
}
// if statement
}
// class ends here
第二课：
public class ChatService extends ListActivity {
/** Called when the activity is first created. */
BufferedReader in = null;
String data = null;
List headlines;
List links;
String GotPass;
String GotUname;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//get strings
Bundle gotData = getIntent().getExtras();
if(gotData !=null) {
GotPass = gotData.getString("keypass");
GotUname = gotData.getString("keyuname");
try {
//listview method
ContactsandIm();
} catch (ClientProtocolException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (URISyntaxException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
try {
CheckLogin();
} catch (UnsupportedEncodingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
private void CheckLogin() throws UnsupportedEncodingException {
// posts login data from "LogIn" class
// Create a new HttpClient and Post Header
HttpClient httpclient = new DefaultHttpClient();
/* login.php returns true if username and password is equal to saranga */
HttpPost httppost = new HttpPost("http://gta5news.com/login.php");
try {
// Add user name and password
List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(2);
nameValuePairs.add(new BasicNameValuePair("username", GotUname));
nameValuePairs.add(new BasicNameValuePair("password", GotPass));
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
// Execute HTTP Post Request
Log.w("HttpPost(Login)", "Execute HTTP Post Request(ChatService 1)");
HttpResponse response = httpclient.execute(httppost);
String str = inputStreamToString(response.getEntity().getContent())
.toString();
Log.w("HttpPost", str);
if (str.toString().equalsIgnoreCase("true")) {
Log.w("HttpPost(ChatService 2)", "TRUE");
// make toast if str.equals("True")
Toast.makeText(getApplicationContext(), "Yayayaya, loged in", Toast.LENGTH_LONG );
}else {
Log.w("HttpPost(ChatService 3", "FALSE");
Toast.makeText(getApplicationContext(), "failed", Toast.LENGTH_LONG);
}
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
private StringBuilder inputStreamToString(InputStream is) {
String line = "";
StringBuilder total = new StringBuilder();
// Wrap a BufferedReader around the InputStream
BufferedReader rd = new BufferedReader(new InputStreamReader(is));
// Read response until the end
try {
while ((line = rd.readLine()) != null) {
total.append(line);
}
} catch (IOException e) {
e.printStackTrace();
}
// Return full string
return total;
}
public void ContactsandIm() throws URISyntaxException,
ClientProtocolException, IOException {
headlines = new ArrayList();
// TODO Auto-generated method stub
BufferedReader in = null;
String data = null;
HttpClient get = new DefaultHttpClient();
URI website = new URI("http://www.gta5news.com/test.php");
HttpGet webget = new HttpGet();
webget.setURI(website);
HttpResponse response = get.execute(webget);
Log.w("HttpPost", "Execute HTTP Post Request");
in = new BufferedReader(new InputStreamReader(response.getEntity()
.getContent()));
StringBuffer sb = new StringBuffer("");
String l ="";
String nl ="";
while ((l =in.readLine()) !=null) {
sb.append(l + nl);
}
in.close();
data = sb.toString();
if(data.contains("null"));
ListView lv = getListView();
lv.setTextFilterEnabled(true);
headlines.add(data);
ArrayAdapter adapter = new ArrayAdapter(this,
android.R.layout.simple_list_item_1, headlines);
setListAdapter(adapter);
}
// end bracket for "ContactsandIm"
}
答案 0 :(得分：1)
试试这种方式。
Intent a = new Intent(context, MyActivity.class);
a.putExtra("String1", "Hello World");
context.startActivity(a);
和
Bundle extras = getIntent().getExtras();
String s1 = extras.getString("String1");
答案 1 :(得分：0)
您应该在Manifest.xml文件中添加两个活动
答案 2 :(得分：0)
检查您是否在清单文件中注册了您的活动。