我正在使用MySQL数据库，并且我使用在互联网上找到的JSONParser.class从数据库中选择我的数据，但是值总是显示Null，请帮忙，我是新来的
这是我的主要活动课程：
public class Profil extends Activity{
private static String url = "http://10.0.2.2/koperasidb/tampil_profil.php";
private static final String TAG_ANGGOTA = "anggota";
private JSONParser jsonParser;
private JSONObject json;
private JSONArray jArray;
String kodeanggota;
private Session session;//global variable
private String no_ba,nm,jk,agama,tmptlahir,tgllahir,blnlahir,thnlahir,status,alamat,notelp,email;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
session = new Session(this); //onCreate Session class
//mengambil string kdanggota
kodeanggota = session.getkdanggota();
jsonParser = new JSONParser();
ArrayList<NameValuePair> postParameters = new ArrayList<NameValuePair>();
postParameters.add(new BasicNameValuePair("kode", kodeanggota));
//profil = new ArrayList<HashMap<String, String>>();
try {
json = jsonParser.makeHttpRequest(url, "POST", postParameters);
jArray = json.getJSONArray(TAG_ANGGOTA);
for (int i = 0; i < jArray.length(); i++) {
JSONObject job = jArray.getJSONObject(i);
no_ba = job.getString("no_ba");
nm = job.getString("nama");
jk = job.getString("jk");
agama = job.getString("agama");
tmptlahir = job.getString("tmptlhr");
tgllahir = job.getString("tgllhr");
blnlahir = job.getString("blnlhr");
thnlahir = job.getString("thnlhr");
status = job.getString("status");
alamat = job.getString("alamat");
notelp = job.getString("notelp");
email = job.getString("email");
}
} catch (JSONException e) {
e.printStackTrace();
} finally {
tampilkanprofil();
}
}
private void tampilkanprofil() {
TextView profilnama = (TextView) findViewById(R.id.profilnamaanggota);
profilnama.setText(nm);
TextView profiljk = (TextView) findViewById(R.id.profiljk);
profiljk.setText(jk);
TextView profilnoba = (TextView) findViewById(R.id.profilkodeba);
profilnoba.setText(no_ba);
TextView profilagama = (TextView) findViewById(R.id.profilagama);
profilagama.setText(agama);
TextView profilttl = (TextView) findViewById(R.id.profilttl);
profilttl.setText(tmptlahir + ", " + tgllahir + " " + blnlahir + " " + thnlahir);
TextView profilstatus = (TextView) findViewById(R.id.profilstatus);
profilstatus.setText(status);
TextView profilalamat = (TextView) findViewById(R.id.profilalamat);
profilalamat.setText(alamat);
TextView profilnotelp = (TextView) findViewById(R.id.profilnotelp);
profilnotelp.setText(notelp);
TextView profilemail = (TextView) findViewById(R.id.profilemail);
profilemail.setText(email);
}
}
这是我的php文件：
<?php
include ("koneksi.php");
$response = array();
$kd=$_POST['kdanggota'];
$result = mysql_query("SELECT * FROM anggota_baru WHERE kd_anggota ='$kd' ") or die(mysql_error());
$response["anggota"] = array();
while($row = mysql_fetch_array($result)){
$profil = array();
$profil["no_ba"] = $row["no_ba"];
$profil["nama"] = $row["nama_lengkap"];
$profil["jk"] = $row["kelamin"];
$profil["agama"] = $row["agama"];
$profil["tmptlhr"] = $row["tempat_lahir"];
$profil["ttgllhr"] = $row["tgl_lahir"];
$profil["blnlhr"] = $row["bln_lahir"];
$profil["thnlhr"] = $row["thn_lahir"];
$profil["status"] = $row["status_nikah"];
$profil["alamat"] = $row["alamat"];
$profil["notelp"] = $row["no_telp"];
$profil["email"] = $row["email"];
array_push($response["anggota"],$profil);
}
echo json_encode($response);
?>
这是我的logcat错误：
05-08 20:20:26.246: WARN/System.err(871): org.json.JSONException: No value for no_ba
05-08 20:20:26.256: WARN/System.err(871): at org.json.JSONObject.get(JSONObject.java:354)
05-08 20:20:26.256: WARN/System.err(871): at org.json.JSONObject.getString(JSONObject.java:510)
05-08 20:20:26.256: WARN/System.err(871): at com.randy.koperasidb.Profil.onCreate(Profil.java:55)
05-08 20:20:26.256: WARN/System.err(871): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
05-08 20:20:26.266: WARN/System.err(871): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1586)
05-08 20:20:26.266: WARN/System.err(871): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1638)
05-08 20:20:26.266: WARN/System.err(871): at android.app.ActivityThread.access$1500(ActivityThread.java:117)
05-08 20:20:26.286: WARN/System.err(871): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:928)
05-08 20:20:26.286: WARN/System.err(871): at android.os.Handler.dispatchMessage(Handler.java:99)
05-08 20:20:26.296: WARN/System.err(871): at android.os.Looper.loop(Looper.java:123)
05-08 20:20:26.296: WARN/System.err(871): at android.app.ActivityThread.main(ActivityThread.java:3647)
05-08 20:20:26.306: WARN/System.err(871): at java.lang.reflect.Method.invokeNative(Native Method)
05-08 20:20:26.306: WARN/System.err(871): at java.lang.reflect.Method.invoke(Method.java:507)
05-08 20:20:26.316: WARN/System.err(871): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
05-08 20:20:26.316: WARN/System.err(871): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
05-08 20:20:26.327: WARN/System.err(871): at dalvik.system.NativeStart.main(Native Method)
05-08 20:20:26.346: DEBUG/AndroidRuntime(871): Shutting down VM
05-08 20:20:26.346: WARN/dalvikvm(871): threadid=1: thread exiting with uncaught exception (group=0x40015560)
05-08 20:20:26.366: ERROR/AndroidRuntime(871): FATAL EXCEPTION: main
05-08 20:20:26.366: ERROR/AndroidRuntime(871): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.randy.koperasidb/com.randy.koperasidb.Profil}: java.lang.NullPointerException
05-08 20:20:26.366: ERROR/AndroidRuntime(871): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1622)
05-08 20:20:26.366: ERROR/AndroidRuntime(871): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1638)
05-08 20:20:26.366: ERROR/AndroidRuntime(871): at android.app.ActivityThread.access$1500(ActivityThread.java:117)
05-08 20:20:26.366: ERROR/AndroidRuntime(871): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:928)
05-08 20:20:26.366: ERROR/AndroidRuntime(871): at android.os.Handler.dispatchMessage(Handler.java:99)
05-08 20:20:26.366: ERROR/AndroidRuntime(871): at android.os.Looper.loop(Looper.java:123)
05-08 20:20:26.366: ERROR/AndroidRuntime(871): at android.app.ActivityThread.main(ActivityThread.java:3647)
05-08 20:20:26.366: ERROR/AndroidRuntime(871): at java.lang.reflect.Method.invokeNative(Native Method)
05-08 20:20:26.366: ERROR/AndroidRuntime(871): at java.lang.reflect.Method.invoke(Method.java:507)
05-08 20:20:26.366: ERROR/AndroidRuntime(871): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
05-08 20:20:26.366: ERROR/AndroidRuntime(871): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
05-08 20:20:26.366: ERROR/AndroidRuntime(871): at dalvik.system.NativeStart.main(Native Method)
05-08 20:20:26.366: ERROR/AndroidRuntime(871): Caused by: java.lang.NullPointerException
05-08 20:20:26.366: ERROR/AndroidRuntime(871): at com.randy.koperasidb.Profil.tampilkanprofil(Profil.java:78)
05-08 20:20:26.366: ERROR/AndroidRuntime(871): at com.randy.koperasidb.Profil.onCreate(Profil.java:72)
05-08 20:20:26.366: ERROR/AndroidRuntime(871): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
05-08 20:20:26.366: ERROR/AndroidRuntime(871): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1586)
05-08 20:20:26.366: ERROR/AndroidRuntime(871): ... 11 more
05-08 20:20:26.396: WARN/ActivityManager(61): Force finishing activity com.randy.koperasidb/.Profil
05-08 20:20:26.416: WARN/ActivityManager(61): Force finishing activity com.randy.koperasidb/.Home
05-08 20:20:26.927: WARN/ActivityManager(61): Activity pause timeout for HistoryRecord{40693400 com.randy.koperasidb/.Profil}
05-08 20:20:28.177: INFO/Process(871): Sending signal. PID: 871 SIG: 9
05-08 20:20:28.207: INFO/ActivityManager(61): Process com.randy.koperasidb (pid 871) has died.
05-08 20:20:28.217: INFO/WindowManager(61): WIN DEATH: Window{406a6770 com.randy.koperasidb/com.randy.koperasidb.login paused=false}
05-08 20:20:28.257: ERROR/InputDispatcher(61): channel '40774e40 com.randy.koperasidb/com.randy.koperasidb.Home (server)' ~ Consumer closed input channel or an error occurred. events=0x8
05-08 20:20:28.257: ERROR/InputDispatcher(61): channel '40774e40 com.randy.koperasidb/com.randy.koperasidb.Home (server)' ~ Channel is unrecoverably broken and will be disposed!
05-08 20:20:28.327: INFO/WindowManager(61): WIN DEATH: Window{40774e40 com.randy.koperasidb/com.randy.koperasidb.Home paused=true}
05-08 20:20:29.027: WARN/InputManagerService(61): Got RemoteException sending setActive(false) notification to pid 871 uid 10041
答案 0 :(得分：1)
您正在从名为＆＃34; kode＆＃34;在行
postParameters.add(new BasicNameValuePair("kode", kodeanggota));
但你接受了名字＆＃34; kdanggota＆＃34;在行
$kd=$_POST['kdanggota'];
因此，服务器正在发送空数组，而您没有检查数组是否为空。发送和接收数据时请使用相同的参数名称。
答案 1 :(得分：1)
我可以看到一个没有logcat的错误，如下所示;
1 - 当您尝试在kode中找不到BasicNameValuePair中不存在的'kdanggota'时，您已在$_POST中分配了密钥`$kd=$_POST['kode'];` //You need to write kode here because that is what is the key for your pair.
。所以改变php的第四行如下
{{1}}
请发布logcat以获取更多信息