我已经创建了一个android应用程序，并尝试从数据库中选择数据到表行和textview。
但是当我试图处理json响应时，得到错误，这里是代码
public void selectfromDb(){
try{
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost("http://xxxxxxxx/selectall.php");
HttpResponse response = httpclient.execute(httppost);
HttpEntity entity = response.getEntity();
is = entity.getContent();
Log.e("log_tag", "connection success ");
// Toast.makeText(getApplicationContext(), "pass", Toast.LENGTH_SHORT).show();
}
catch(Exception e)
{
Log.e("log_tag", "Error in http connection "+e.toString());
Toast.makeText(getActivity(), "Connection fail", Toast.LENGTH_SHORT).show();
}
//convert response to string
try
{
BufferedReader reader = new BufferedReader(new InputStreamReader(is,"iso-8859-1"),8);
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null)
{
sb.append(line + "\n");
// Toast.makeText(getApplicationContext(), "Input Reading pass", Toast.LENGTH_SHORT).show();
}
is.close();
result=sb.toString();
}
catch(Exception e)
{
Log.e("log_tag", "Error converting result "+e.toString());
Toast.makeText(getActivity(), " Input reading fail", Toast.LENGTH_SHORT).show();
}
//parse json data
try
{
JSONArray jArray = new JSONArray(result);
String re=jArray.getString(jArray.length()-1);
TableLayout tv=(TableLayout)getView().findViewById(R.id.table);
tv.removeAllViewsInLayout();
int flag=1;
for(int i=-1;i<jArray.length()-1;i++)
{
TableRow tr=new TableRow(getActivity());
tr.setLayoutParams(new LayoutParams(
LayoutParams.FILL_PARENT,
LayoutParams.WRAP_CONTENT));
if(flag==1)
{
TextView b6=new TextView(getActivity());
b6.setText("ID");
b6.setTextColor(Color.BLUE);
b6.setTextSize(15);
tr.addView(b6);
TextView b19=new TextView(getActivity());
b19.setPadding(10, 0, 0, 0);
b19.setTextSize(15);
b19.setText("Matier");
b19.setTextColor(Color.BLUE);
tr.addView(b19);
tv.addView(tr);
final View vline = new View(getActivity());
vline.setLayoutParams(new TableRow.LayoutParams(TableRow.LayoutParams.FILL_PARENT, 2));
vline.setBackgroundColor(Color.BLUE);
tv.addView(vline);
flag=0;
}else
{
JSONObject json_data = jArray.getJSONObject(i);
Log.i("log_tag","id: "+json_data.getInt("f1")+
", matier: "+json_data.getString("f2")
);
TextView b=new TextView(getActivity());
// String stime=String.valueOf(json_data.getInt("f1"));
b.setText(json_data.optString("f1"));
b.setTextColor(Color.RED);
b.setTextSize(15);
tr.addView(b);
TextView b1=new TextView(getActivity());
b1.setPadding(10, 0, 0, 0);
b1.setTextSize(15);
String stime1=json_data.optString("f2");
b1.setText(stime1);
b1.setTextColor(Color.WHITE);
tr.addView(b1);
tv.addView(tr);
final View vline1 = new View(getActivity());
vline1.setLayoutParams(new TableRow.LayoutParams(TableRow.LayoutParams.FILL_PARENT, 1));
vline1.setBackgroundColor(Color.WHITE);
tv.addView(vline1);
}
}
}
catch(JSONException e)
{
Log.e("log_tag", "Error parsing data "+e.toString());
Toast.makeText(getActivity(), e.toString(), Toast.LENGTH_SHORT).show();
}
}
}
这是代码php
<?php
$con = mysql_connect("","","");
if (!$con)
{
die('Could not connect: ' . mysql_error());
}
mysql_select_db("databas", $con);
$i=mysql_query("select * from test",$con);
$num_rows = mysql_num_rows($i);
$check='';
while($row = mysql_fetch_array($i))
{
$r[]=$row;
$check=$row['f1'];
}
if($check==NULL)
{
$r[$num_rows]="Record is not available";
echo json_encode($r);
}
else
{
$r[$num_rows]="success";
echo json_encode($r);
}
mysql_close($con);
?>
JSON exception no value for 'f1'
答案 0 :(得分：0)
这是php文件的输出
[{"0":"66","id":"66","1":"","matier":""},{"0":"65","id":"65","1":"","matier":""},{"0":"64","id":"64","1":"","matier":""},{"0":"63","id":"63","1":"","matier":""},{"0":"62","id":"62","1":"","matier":""},{"0":"61","id":"61","1":"","matier":""},{"0":"60","id":"60","1":"","matier":""},{"0":"59","id":"59","1":"","matier":""},{"0":"58","id":"58","1":"","matier":""},{"0":"57","id":"57","1":"","matier":""},{"0":"56","id":"56","1":"","matier":""},{"0":"55","id":"55","1":"","matier":""},{"0":"54","id":"54","1":"test","matier":"test"},{"0":"53","id":"53","1":"jfhhf","matier":"jfhhf"},{"0":"52","id":"52","1":"jfhhf","matier":"jfhhf"},{"0":"42","id":"42","1":"ykk","matier":"ykk"},{"0":"51","id":"51","1":"jfhhf","matier":"jfhhf"},{"0":"50","id":"50","1":"jfhhf","matier":"jfhhf"},{"0":"49","id":"49","1":"opp","matier":"opp"},{"0":"48","id":"48","1":"opp","matier":"opp"},{"0":"47","id":"47","1":"opp","matier":"opp"},{"0":"46","id":"46","1":"opp","matier":"opp"},{"0":"45","id":"45","1":"opp","matier":"opp"},{"0":"44","id":"44","1":"ykfvjf","matier":"ykfvjf"},{"0":"43","id":"43","1":"ykfvjf","matier":"ykfvjf"},"Record is not available"]