我无法在聊天中显示朋友姓名。应用程序每次运行时都会强制关闭以显示朋友的名字。如果我评论朋友姓名的部分，则消息会显示得很好。但是当我添加名称标签时，它出错并强制关闭。我真的需要帮助，请任何人帮助我。谢谢你
json部分
if(!content.equals("null")){
try{
JSONArray jArr = new JSONArray(content);
// String messages="";
for(int i=0; i < jArr.length() ; i++){
JSONObject jObj = jArr.getJSONObject(i);
String name = jObj.getString("firstname");
String message = jObj.getString("message");
friendLabel.setText(name);
showMessage(message, false);
}
}catch(JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
else{
Toast.makeText(ChatRoom.this, "Error", Toast.LENGTH_LONG).show();
}
整个代码
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.chatpage);
messagesContainer = (ViewGroup) findViewById(R.id.messagesContainer);
scrollContainer = (ScrollView) findViewById(R.id.scrollContainer);
Button sendMessageButton = (Button) findViewById(R.id.sendButton);
Bundle bundle = this.getIntent().getExtras();
/*final String paramnama = bundle.getString("nama");*/
messageText = (EditText) findViewById(R.id.messageEdit);
meLabel = (TextView) findViewById(R.id.meLabel);
friendLabel = (TextView) findViewById(R.id.friendLabel);
meLabel.setText("me");
final String param1 = bundle.getString("keyCourseId");
final String param2 = bundle.getString("keyUserId");
final String param3 = bundle.getString("keyChatsId");
String param4 = bundle.getString("keyMessagesId");
sendMessageButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
//for send part already works fine
});
HttpURLConnection connection;
URL url = null;
try{
linkurl = new Koneksi(this);
SERVER_URL = linkurl.getUrl();
SERVER_URL += "/mobile/ChatRoom.php?idu="+param2+"&idch="+param3;
url = new URL(SERVER_URL);
connection = (HttpURLConnection) url.openConnection();
connection.setDoOutput(true);
connection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
connection.setRequestMethod("POST");
new ReceivedTask().execute();
}
catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public class ReceivedTask extends AsyncTask<String, String, String> {
@Override
protected void onPreExecute() {
}
@Override
protected String doInBackground(String... arg0) {
// TODO Auto-generated method stub
try{
HttpClient httpClient = new DefaultHttpClient();
HttpPost httpPost = new HttpPost(SERVER_URL);
ArrayList<NameValuePair> param = new ArrayList<NameValuePair>();
//add parameter
httpPost.setEntity(new UrlEncodedFormEntity(param));
HttpResponse httpRespose = httpClient.execute(httpPost);
HttpEntity httpEntity = httpRespose.getEntity();
//read content
InputStream in = httpEntity.getContent();
BufferedReader read = new BufferedReader(new InputStreamReader(in));
String content = "";
String line = "";
while((line = read.readLine())!=null){
content += line;
}
Log.d("ADBUG", "content: "+content);
//json
if(!content.equals("null")){
try{
JSONArray jArr = new JSONArray(content);
// String messages="";
for(int i=0; i < jArr.length() ; i++){
JSONObject jObj = jArr.getJSONObject(i);
String message = jObj.getString("message");
showMessage(message, false);
}
}catch(JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
else{
Toast.makeText(ChatRoom.this, "Error", Toast.LENGTH_LONG).show();
}
} catch (ClientProtocolException e) {
// TODO Auto-generated catch block
e.printStackTrace();}
catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return null;
}
}
public void showMessage(String message, boolean leftSide) {
final TextView textView = new TextView(ChatRoom.this);
textView.setTextColor(Color.BLACK);
textView.setText(message);
int bgRes = R.drawable.left_message_bg;
LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(
LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT);
if (!leftSide) {
bgRes = R.drawable.right_message_bg;
params.gravity = Gravity.RIGHT;
}
textView.setLayoutParams(params);
textView.setBackgroundResource(bgRes);
runOnUiThread(new Runnable() {
@Override
public void run() {
messagesContainer.addView(textView);
// Scroll to bottom
if (scrollContainer.getChildAt(0) != null) {
scrollContainer.scrollTo(scrollContainer.getScrollX(), scrollContainer.getChildAt(0).getHeight());
}
scrollContainer.fullScroll(View.FOCUS_DOWN);
}
});
}
日志猫
06-22 17:16:06.688: D/ADBUG(698): content: [{"firstname":"teach","message":"test"},{"firstname":"teach","message":"test"},{"firstname":"teach","message":"test"},{"firstname":"teach","message":"testing chat"},
06-22 17:16:06.787: W/dalvikvm(698): threadid=11: thread exiting with uncaught exception (group=0x40015560)
06-22 17:16:06.797: E/AndroidRuntime(698): FATAL EXCEPTION: AsyncTask #2
06-22 17:16:06.797: E/AndroidRuntime(698): java.lang.RuntimeException: An error occured while executing doInBackground()
06-22 17:16:06.797: E/AndroidRuntime(698): at android.os.AsyncTask$3.done(AsyncTask.java:200)
06-22 17:16:06.797: E/AndroidRuntime(698): at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:274)
06-22 17:16:06.797: E/AndroidRuntime(698): at java.util.concurrent.FutureTask.setException(FutureTask.java:125)
06-22 17:16:06.797: E/AndroidRuntime(698): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:308)
06-22 17:16:06.797: E/AndroidRuntime(698): at java.util.concurrent.FutureTask.run(FutureTask.java:138)
06-22 17:16:06.797: E/AndroidRuntime(698): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1088)
06-22 17:16:06.797: E/AndroidRuntime(698): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:581)
06-22 17:16:06.797: E/AndroidRuntime(698): at java.lang.Thread.run(Thread.java:1019)
06-22 17:16:06.797: E/AndroidRuntime(698): Caused by: android.view.ViewRoot$CalledFromWrongThreadException: Only the original thread that created a view hierarchy can touch its views.
06-22 17:16:06.797: E/AndroidRuntime(698): at android.view.ViewRoot.checkThread(ViewRoot.java:2932)
06-22 17:16:06.797: E/AndroidRuntime(698): at android.view.ViewRoot.requestLayout(ViewRoot.java:629)
06-22 17:16:06.797: E/AndroidRuntime(698): at android.view.View.requestLayout(View.java:8267)
06-22 17:16:06.797: E/AndroidRuntime(698): at android.view.View.requestLayout(View.java:8267)
06-22 17:16:06.797: E/AndroidRuntime(698): at android.view.View.requestLayout(View.java:8267)
06-22 17:16:06.797: E/AndroidRuntime(698): at android.view.View.requestLayout(View.java:8267)
06-22 17:16:06.797: E/AndroidRuntime(698): at android.widget.RelativeLayout.requestLayout(RelativeLayout.java:257)
06-22 17:16:06.797: E/AndroidRuntime(698): at android.view.View.requestLayout(View.java:8267)
06-22 17:16:06.797: E/AndroidRuntime(698): at android.widget.ScrollView.requestLayout(ScrollView.java:1291)
06-22 17:16:06.797: E/AndroidRuntime(698): at android.view.View.requestLayout(View.java:8267)
06-22 17:16:06.797: E/AndroidRuntime(698): at android.view.View.requestLayout(View.java:8267)
06-22 17:16:06.797: E/AndroidRuntime(698): at android.widget.TextView.checkForRelayout(TextView.java:5521)
06-22 17:16:06.797: E/AndroidRuntime(698): at android.widget.TextView.setText(TextView.java:2724)
06-22 17:16:06.797: E/AndroidRuntime(698): at android.widget.TextView.setText(TextView.java:2592)
06-22 17:16:06.797: E/AndroidRuntime(698): at android.widget.TextView.setText(TextView.java:2567)
06-22 17:16:06.797: E/AndroidRuntime(698): at mobile.chat.ChatRoom$ReceivedTask.doInBackground(ChatRoom.java:199)
06-22 17:16:06.797: E/AndroidRuntime(698): at mobile.chat.ChatRoom$ReceivedTask.doInBackground(ChatRoom.java:1)
06-22 17:16:06.797: E/AndroidRuntime(698): at android.os.AsyncTask$2.call(AsyncTask.java:185)
06-22 17:16:06.797: E/AndroidRuntime(698): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:306)
06-22 17:16:06.797: E/AndroidRuntime(698): ... 4 more