我正在创建一个Android应用程序，对本地主机MySQL数据库上的数据执行添加，更新和删除操作。除了更新部分，一切正常。我试图更新数据时会在活动ViewFeedingSched上发生。按下更新按钮时或仅在调用更新功能时，应用程序崩溃。 logcat给出了一条消息：threadid=1: thread exiting with uncaught exception (group=0x41640c80).
更新即可。这是从logcat获得的json
04-26 18:19:32.550 26244-26244/com.aps.thesisit.aps I/TAG: Should be json<br />
<font size='1'><table class='xdebug-error xe-notice' dir='ltr' border='1' cellspacing='0' cellpadding='1'>
<tr><th align='left' bgcolor='#f57900' colspan="5"><span style='background-color: #cc0000; color: #fce94f; font-size: x-large;'>( ! )</span> Notice: Undefined variable: id in C:\wamp64\www\feedingschedHTTP\getSelectedFeedSched.php on line <i>10</i></th></tr>
<tr><th align='left' bgcolor='#e9b96e' colspan='5'>Call Stack</th></tr>
<tr><th align='center' bgcolor='#eeeeec'>#</th><th align='left' bgcolor='#eeeeec'>Time</th><th align='left' bgcolor='#eeeeec'>Memory</th><th align='left' bgcolor='#eeeeec'>Function</th><th align='left' bgcolor='#eeeeec'>Location</th></tr>
<tr><td bgcolor='#eeeeec' align='center'>1</td><td bgcolor='#eeeeec' align='center'>0.0019</td><td bgcolor='#eeeeec' align='right'>235496</td><td bgcolor='#eeeeec'>{main}( )</td><td title='C:\wamp64\www\feedingschedHTTP\getSelectedFeedSched.php' bgcolor='#eeeeec'>...\getSelectedFeedSched.php<b>:</b>0</td></tr>
</table></font>
<br />
<font size='1'><table class='xdebug-error xe-warning' dir='ltr' border='1' cellspacing='0' cellpadding='1'>
<tr><th align='left' bgcolor='#f57900' colspan="5"><span style='background-color: #cc0000; color: #fce94f; font-size: x-large;'>( ! )</span> Warning: mysqli_fetch_array() expects parameter 1 to be mysqli_result, boolean given in C:\wamp64\www\feedingschedHTTP\getSelectedFeedSched.php on line <i>17</i></th></tr>
<tr><th align='left' bgcolor='#e9b96e' colspan='5'>Call Stack</th></tr>
<tr><th align='center' bgcolor='#eeeeec'>#</th><th align='left' bgcolor='#eeeeec'>Time</th><th align='left' bgcolor='#eeeeec'>Memory</th><th align='left' bgcolor='#eeeeec'>Function</th><th align='left' bgcolor='#eeeeec'>Location</th></tr>
<tr><td bgcolor='#eeeeec' align='center'>1</td><td bgcolor='#eeeeec' align='center'>0.0019</td><td bgcolor='#eeeeec' align='right'>235496</td><td bgcolor='#eeeeec'>{main}( )</td><td title='C:\wamp64\www\feedingschedHTTP\getSelectedFeedSched.php' bgcolor='#eeeeec'>...\getSelectedFeedSched.php<b>:</b>0</td></tr>
<tr><td bgcolor='#eeeeec' align='center'>2</td><td bgcolor='#eeeeec' align='center'>0.2416</td><td bgcolor='#eeeeec' align='right'>246392</td><td bgcolor='#eeeeec'><a href='http://www.php.net/function.mysqli-fetch-array' target='_new'>mysqli_fetch_array</a>
( )</td><td title='C:\wamp64\www\feedingschedHTTP\getSelectedFeedSched.php' bgcolor='#eeeeec'>...\getSelectedFeedSched.php<b>:</b>17</td></tr>
</table></font>
{"result":[{"schedno":null,"feedtime":null,"feedamt":null}]}
04-26 18:19:32.550 26244-26244/com.aps.thesisit.aps I/TAG: Should be json<br />
<font size='1'><table class='xdebug-error xe-notice' dir='ltr' border='1' cellspacing='0' cellpadding='1'>
<tr><th align='left' bgcolor='#f57900' colspan="5"><span style='background-color: #cc0000; color: #fce94f; font-size: x-large;'>( ! )</span> Notice: Undefined variable: id in C:\wamp64\www\feedingschedHTTP\getSelectedFeedSched.php on line <i>10</i></th></tr>
<tr><th align='left' bgcolor='#e9b96e' colspan='5'>Call Stack</th></tr>
<tr><th align='center' bgcolor='#eeeeec'>#</th><th align='left' bgcolor='#eeeeec'>Time</th><th align='left' bgcolor='#eeeeec'>Memory</th><th align='left' bgcolor='#eeeeec'>Function</th><th align='left' bgcolor='#eeeeec'>Location</th></tr>
<tr><td bgcolor='#eeeeec' align='center'>1</td><td bgcolor='#eeeeec' align='center'>0.0019</td><td bgcolor='#eeeeec' align='right'>235496</td><td bgcolor='#eeeeec'>{main}( )</td><td title='C:\wamp64\www\feedingschedHTTP\getSelectedFeedSched.php' bgcolor='#eeeeec'>...\getSelectedFeedSched.php<b>:</b>0</td></tr>
</table></font>
<br />
<font size='1'><table class='xdebug-error xe-warning' dir='ltr' border='1' cellspacing='0' cellpadding='1'>
<tr><th align='left' bgcolor='#f57900' colspan="5"><span style='background-color: #cc0000; color: #fce94f; font-size: x-large;'>( ! )</span> Warning: mysqli_fetch_array() expects parameter 1 to be mysqli_result, boolean given in C:\wamp64\www\feedingschedHTTP\getSelectedFeedSched.php on line <i>17</i></th></tr>
<tr><th align='left' bgcolor='#e9b96e' colspan='5'>Call Stack</th></tr>
<tr><th align='center' bgcolor='#eeeeec'>#</th><th align='left' bgcolor='#eeeeec'>Time</th><th align='left' bgcolor='#eeeeec'>Memory</th><th align='left' bgcolor='#eeeeec'>Function</th><th align='left' bgcolor='#eeeeec'>Location</th></tr>
<tr><td bgcolor='#eeeeec' align='center'>1</td><td bgcolor='#eeeeec' align='center'>0.0019</td><td bgcolor='#eeeeec' align='right'>235496</td><td bgcolor='#eeeeec'>{main}( )</td><td title='C:\wamp64\www\feedingschedHTTP\getSelectedFeedSched.php' bgcolor='#eeeeec'>...\getSelectedFeedSched.php<b>:</b>0</td></tr>
<tr><td bgcolor='#eeeeec' align='center'>2</td><td bgcolor='#eeeeec' align='center'>0.2416</td><td bgcolor='#eeeeec' align='right'>246392</td><td bgcolor='#eeeeec'><a href='http://www.php.net/function.mysqli-fetch-array' target='_new'>mysqli_fetch_array</a>
( )</td><td title='C:\wamp64\www\feedingschedHTTP\getSelectedFeedSched.php' bgcolor='#eeeeec'>...\getSelectedFeedSched.php<b>:</b>17</td></tr>
</table></font>
{"result":[{"schedno":null,"feedtime":null,"feedamt":null}]}
ViewFeedingSched类
public class ViewFeedingSched extends AppCompatActivity implements View.OnClickListener {
private EditText editTextFeedAmt;
private TextView textViewCurrentTimeSet;
private TextView textViewIDSelected;
//private TextView textViewCurrentAmtSet;
private NumberPicker numPickerHr;
private NumberPicker numPickerMin;
//private Spinner spinnerFeedAmt;
//ArrayAdapter<CharSequence> adapter;
private Button buttonUpdate;
private Button buttonDelete;
private String id;
private String ftime;
// private String famt;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.view_feeding_sched);
Intent intent = getIntent();
id = intent.getStringExtra(Config.SCHED_ID);
ftime = intent.getStringExtra(Config.FEEDTIME);
textViewCurrentTimeSet = (TextView) findViewById(R.id.TV_CurrentTimeSet);
textViewIDSelected = (TextView) findViewById(R.id.TV_PickedSchedID);
buttonUpdate = (Button) findViewById(R.id.BT_UpdateSched);
buttonDelete = (Button) findViewById(R.id.BT_DeleteSched);
buttonUpdate.setOnClickListener(this);
buttonDelete.setOnClickListener(this);
textViewIDSelected.setText(id);
textViewCurrentTimeSet.setText(ftime);
numPickerHr = (NumberPicker) findViewById(R.id.NP_Hour);
numPickerHr.setMinValue(0);
numPickerHr.setMaxValue(23);
numPickerHr.setWrapSelectorWheel(true);
numPickerMin = (NumberPicker) findViewById(R.id.NP_Min);
numPickerMin.setMinValue(0);
numPickerMin.setMaxValue(59);
numPickerMin.setWrapSelectorWheel(true);
getSchedule();
}
private void getSchedule(){
class GetSchedule extends AsyncTask<Void,Void,String>{
ProgressDialog loading;
@Override
protected void onPreExecute() {
super.onPreExecute();
loading = ProgressDialog.show(ViewFeedingSched.this,"Fetching...","Wait...",false,false);
}
@Override
protected void onPostExecute(String s) {
super.onPostExecute(s);
loading.dismiss();
showSchedule(s);
}
@Override
protected String doInBackground(Void... params) {
RequestHandler rh = new RequestHandler();
String s = rh.sendGetRequestParam(Config.URL_GET_SCHED,id);
return s;
}
}
GetSchedule ge = new GetSchedule();
ge.execute();
}
private void showSchedule(String json){
try {
JSONObject jsonObject = new JSONObject(json);
JSONArray result = jsonObject.getJSONArray(Config.TAG_JSON_ARRAY);
JSONObject c = result.getJSONObject(0);
String feedtime = c.getString(Config.TAG_FEEDTIME);
textViewCurrentTimeSet.setText(feedtime);
} catch (JSONException e) {
e.printStackTrace();
}
}
private void updateSchedule(){
final String feedamt = editTextFeedAmt.getText().toString().trim();
final String NP_FeedTime_HR = String.valueOf(numPickerHr.getValue()).trim();
final String NP_FeedTime_MIN = String.valueOf(numPickerMin.getValue()).trim();
class UpdateSchedule extends AsyncTask<Void,Void,String>{
ProgressDialog loading;
@Override
protected void onPreExecute() {
super.onPreExecute();
loading = ProgressDialog.show(ViewFeedingSched.this,"Updating...","Wait...",false,false);
}
@Override
protected void onPostExecute(String s) {
super.onPostExecute(s);
loading.dismiss();
Toast.makeText(ViewFeedingSched.this,s,Toast.LENGTH_LONG).show();
}
@Override
protected String doInBackground(Void... params) {
HashMap<String,String> hashMap = new HashMap<>();
hashMap.put(Config.KEY_SCHED_ID,id);
hashMap.put(Config.KEY_FEED_TIME,NP_FeedTime_HR+":"+NP_FeedTime_MIN+":00");
hashMap.put(Config.KEY_FEED_AMT,feedamt);
RequestHandler rh = new RequestHandler();
String s = rh.sendPostRequest(Config.URL_UPDATE_SCHED,hashMap);
return s;
}
}
UpdateSchedule ue = new UpdateSchedule();
ue.execute();
}
private void deleteSchedule(){
class DeleteSchedule extends AsyncTask<Void,Void,String> {
ProgressDialog loading;
@Override
protected void onPreExecute() {
super.onPreExecute();
loading = ProgressDialog.show(ViewFeedingSched.this, "Updating...", "Wait...", false, false);
}
@Override
protected void onPostExecute(String s) {
super.onPostExecute(s);
loading.dismiss();
Toast.makeText(ViewFeedingSched.this, s, Toast.LENGTH_LONG).show();
}
@Override
protected String doInBackground(Void... params) {
RequestHandler rh = new RequestHandler();
String s = rh.sendGetRequestParam(Config.URL_DELETE_SCHED, id);
return s;
}
}
DeleteSchedule de = new DeleteSchedule();
de.execute();
}
private void confirmDeleteSchedule(){
AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(this);
alertDialogBuilder.setMessage("Are you sure you want to delete this schedule?");
alertDialogBuilder.setPositiveButton("Yes",
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface arg0, int arg1) {
deleteSchedule();
startActivity(new Intent(ViewFeedingSched.this,FeedingScheduleList.class));
}
});
alertDialogBuilder.setNegativeButton("No",
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface arg0, int arg1) {
}
});
AlertDialog alertDialog = alertDialogBuilder.create();
alertDialog.show();
}
@Override
public void onClick(View v) {
if(v == buttonUpdate){
updateSchedule();
}
if(v == buttonDelete){
confirmDeleteSchedule();
}
}
}
在参加观看活动时的LOGCAT消息
04-26 16:57:00.490 31406-31406/com.aps.thesisit.aps E/dalvikvm: Could not find class 'android.graphics.drawable.RippleDrawable', referenced from method android.support.v7.widget.AppCompatImageHelper.hasOverlappingRendering
04-26 16:57:00.490 31406-31406/com.aps.thesisit.aps W/dalvikvm: VFY: unable to resolve instanceof 153 (Landroid/graphics/drawable/RippleDrawable;) in Landroid/support/v7/widget/AppCompatImageHelper;
04-26 16:57:00.600 31406-31961/com.aps.thesisit.aps I/System.out: [socket][0] connection /192.168.254.103:8080;LocalPort=50670(0)
04-26 16:57:00.600 31406-31961/com.aps.thesisit.aps I/System.out: [CDS]connect[/192.168.254.103:8080]
04-26 16:57:00.620 31406-31961/com.aps.thesisit.aps I/System.out: [CDS]port[50670]
04-26 16:57:00.620 31406-31961/com.aps.thesisit.aps I/System.out: [socket][/192.168.254.101:50670] connected
04-26 16:57:00.620 31406-31961/com.aps.thesisit.aps I/System.out: [CDS]rx timeout:0
04-26 16:57:00.670 31406-31961/com.aps.thesisit.aps I/System.out: [CDS]rx timeout:100
04-26 16:57:00.670 31406-31961/com.aps.thesisit.aps I/System.out: [CDS]rx timeout:0
04-26 16:57:03.630 31406-31406/com.aps.thesisit.aps I/dalvikvm-heap: Grow heap (frag case) to 9.523MB for 2362992-byte allocation
04-26 16:57:03.740 31406-32092/com.aps.thesisit.aps I/System.out: [CDS]rx timeout:0
04-26 16:57:04.190 31406-32092/com.aps.thesisit.aps I/System.out: [CDS]rx timeout:100
04-26 16:57:04.190 31406-32092/com.aps.thesisit.aps I/System.out: [CDS]rx timeout:0
04-26 16:57:04.210 31406-31406/com.aps.thesisit.aps W/System.err: org.json.JSONException: Value <br of type java.lang.String cannot be converted to JSONObject
04-26 16:57:04.210 31406-31406/com.aps.thesisit.aps W/System.err: at org.json.JSON.typeMismatch(JSON.java:111)
04-26 16:57:04.210 31406-31406/com.aps.thesisit.aps W/System.err: at org.json.JSONObject.<init>(JSONObject.java:159)
04-26 16:57:04.210 31406-31406/com.aps.thesisit.aps W/System.err: at org.json.JSONObject.<init>(JSONObject.java:172)
04-26 16:57:04.210 31406-31406/com.aps.thesisit.aps W/System.err: at com.aps.thesisit.aps.ViewFeedingSched.showSchedule(ViewFeedingSched.java:117)
04-26 16:57:04.210 31406-31406/com.aps.thesisit.aps W/System.err: at com.aps.thesisit.aps.ViewFeedingSched.access$000(ViewFeedingSched.java:28)
04-26 16:57:04.210 31406-31406/com.aps.thesisit.aps W/System.err: at com.aps.thesisit.aps.ViewFeedingSched$1GetSchedule.onPostExecute(ViewFeedingSched.java:101)
04-26 16:57:04.210 31406-31406/com.aps.thesisit.aps W/System.err: at com.aps.thesisit.aps.ViewFeedingSched$1GetSchedule.onPostExecute(ViewFeedingSched.java:89)
04-26 16:57:04.210 31406-31406/com.aps.thesisit.aps W/System.err: at android.os.AsyncTask.finish(AsyncTask.java:632)
04-26 16:57:04.210 31406-31406/com.aps.thesisit.aps W/System.err: at android.os.AsyncTask.access$600(AsyncTask.java:177)
04-26 16:57:04.210 31406-31406/com.aps.thesisit.aps W/System.err: at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:645)
04-26 16:57:04.210 31406-31406/com.aps.thesisit.aps W/System.err: at android.os.Handler.dispatchMessage(Handler.java:102)
04-26 16:57:04.210 31406-31406/com.aps.thesisit.aps W/System.err: at android.os.Looper.loop(Looper.java:136)
04-26 16:57:04.210 31406-31406/com.aps.thesisit.aps W/System.err: at android.app.ActivityThread.main(ActivityThread.java:5291)
04-26 16:57:04.210 31406-31406/com.aps.thesisit.aps W/System.err: at java.lang.reflect.Method.invokeNative(Native Method)
04-26 16:57:04.210 31406-31406/com.aps.thesisit.aps W/System.err: at java.lang.reflect.Method.invoke(Method.java:515)
04-26 16:57:04.210 31406-31406/com.aps.thesisit.aps W/System.err: at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:849)
04-26 16:57:04.210 31406-31406/com.aps.thesisit.aps W/System.err: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:665)
04-26 16:57:04.210 31406-31406/com.aps.thesisit.aps W/System.err: at dalvik.system.NativeStart.main(Native Method)
按下更新按钮后的LOGCAT消息
04-26 16:58:14.790 31406-31406/com.aps.thesisit.aps W/dalvikvm: threadid=1: thread exiting with uncaught exception (group=0x41640c80)