2つのアクティビティ間で2つの文字列を渡していますが、何らかの理由で、文字列を受け入れようとするとクラッシュします。重要なことを見逃してしまったような気がしますが、見逃してしまう可能性のあるコードが見つかりません。グーグルはほとんどまたはまったく結果を出さなかった、そしてこれはかなり基本的な仕事であるように思われるので私は本当にイライラする。
どんな助けでも、ありがたいことに感謝します:)
LogCat：
03-25 04:23:03.476: E/AndroidRuntime(1174): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.gta5news.bananaphone/com.gta5news.bananaphone.ChatService}: java.lang.NullPointerException
03-25 04:23:03.476: E/AndroidRuntime(1174): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663)
03-25 04:23:03.476: E/AndroidRuntime(1174): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
03-25 04:23:03.476: E/AndroidRuntime(1174): at android.app.ActivityThread.access$2300(ActivityThread.java:125)
03-25 04:23:03.476: E/AndroidRuntime(1174): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
03-25 04:23:03.476: E/AndroidRuntime(1174): at android.os.Handler.dispatchMessage(Handler.java:99)
03-25 04:23:03.476: E/AndroidRuntime(1174): at android.os.Looper.loop(Looper.java:123)
03-25 04:23:03.476: E/AndroidRuntime(1174): at android.app.ActivityThread.main(ActivityThread.java:4627)
03-25 04:23:03.476: E/AndroidRuntime(1174): at java.lang.reflect.Method.invokeNative(Native Method)
03-25 04:23:03.476: E/AndroidRuntime(1174): at java.lang.reflect.Method.invoke(Method.java:521)
03-25 04:23:03.476: E/AndroidRuntime(1174): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
03-25 04:23:03.476: E/AndroidRuntime(1174): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
03-25 04:23:03.476: E/AndroidRuntime(1174): at dalvik.system.NativeStart.main(Native Method)
03-25 04:23:03.476: E/AndroidRuntime(1174): Caused by: java.lang.NullPointerException
03-25 04:23:03.476: E/AndroidRuntime(1174): at com.gta5news.bananaphone.ChatService.GetLogInData(ChatService.java:76)
03-25 04:23:03.476: E/AndroidRuntime(1174): at com.gta5news.bananaphone.ChatService.onCreate(ChatService.java:47)
03-25 04:23:03.476: E/AndroidRuntime(1174): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
03-25 04:23:03.476: E/AndroidRuntime(1174): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)
03-25 04:23:03.476: E/AndroidRuntime(1174): ... 11 more
コード（クラッシュする2番目のアクティビティ）
public class ChatService extends ListActivity {
/** Called when the activity is first created. */
BufferedReader in = null;
String data = null;
List headlines;
List links;
String GotPass = null;
String GotUname = null;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
GetLogInData();
try {
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 GetLogInData() {
// TODO Auto-generated method stub
Bundle gotData = getIntent().getExtras();
GotPass = gotData.getString("key!");
GotUname = gotData.getString("key!!");
}
private void CheckLogin() throws UnsupportedEncodingException {
}
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"
}
最初のアクティビティ
public class LogIn extends Activity implements OnClickListener {
Button ok, back, exit;
TextView result;
EditText pword;
EditText uname;
/** 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() {
// 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
uname = (EditText) findViewById(R.id.txt_username);
String username = uname.getText().toString();
pword = (EditText) findViewById(R.id.txt_password);
String password = pword.getText().toString();
Bundle basket = new Bundle();
basket.putString("key!", password);
basket.putString("key!!", username);
Intent a = new Intent(LogIn.this, ChatService.class );
a.putExtras(basket);
startActivity(a);
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", "Execute HTTP Post Request");
HttpResponse response = httpclient.execute(httppost);
String str = inputStreamToString(response.getEntity().getContent())
.toString();
Log.w("HttpPost", str);
if (str.toString().equalsIgnoreCase("true")) {
Log.w("HttpPost", "TRUE");
result.setText("Login successful");
try {Thread.sleep(250);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
Intent login = new Intent(LogIn.this, ChatService.class);
startActivity(login);
} else {
Log.w("HttpPost", "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