Hi在我的应用程序中，我设计了一个表单，如果我点击提交按钮，我想在android中以表格格式显示数据。
现在，如果我点击提交按钮，它只显示字段名数据，而没有显示。我是通过使用logcat it打印数据来打印输出的。但logcat给出了一个错误。
参加课堂
public class Attend extends Activity {
String data = "";
TableLayout tl;
TableRow tr;
TextView label;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
tl = (TableLayout) findViewById(R.id.maintable);
final DataseData getdb = new DataseData();
new Thread(new Runnable() {
public void run() {
data = getdb.getDataFromDB();
System.out.println(data);
runOnUiThread(new Runnable() {
@Override
public void run() {
ArrayList<Users> users = parseJSON(data);
addData(users);
}
});
}
}).start();
}
public ArrayList<Users> parseJSON(String result) {
ArrayList<Users> users = new ArrayList<Users>();
try {
JSONObject jsnobject = new JSONObject(result);
JSONArray jsonArray = jsnobject.getJSONArray(result);
for (int i = 0; i < jsnobject.length(); i++) {
JSONObject explrObject = jsonArray.getJSONObject(i);
Users user = new Users();
user.setClass_id(explrObject.getInt("class_id"));
user.setClass_name(explrObject.getString("class_name"));
user.setSection_name(explrObject.getString("section_name"));
users.add(user);
}
} catch (JSONException e) {
Log.e("log_tag", "Error parsing data " + e.toString());
}
return users;
}
void addHeader(){
tr = new TableRow(this);
label = new TextView(this);
label.setText("class_id");
label.setTextColor(Color.BLUE);
label.setTextSize(15);
label.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT,
LayoutParams.WRAP_CONTENT));
label.setPadding(5, 5, 5, 5);
label.setBackgroundColor(Color.RED);
LinearLayout Ll = new LinearLayout(this);
LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(LayoutParams.FILL_PARENT,
LayoutParams.WRAP_CONTENT);
params.setMargins(5, 5, 5, 5);
Ll.addView(label,params);
tr.addView((View)Ll);
TextView class_name = new TextView(this);
class_name.setText("class_name");
class_name.setTextSize(15);
class_name.setTextColor(Color.BLUE);
class_name.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT,
LayoutParams.WRAP_CONTENT));
class_name.setPadding(5, 5, 5, 5);
class_name.setBackgroundColor(Color.RED);
Ll = new LinearLayout(this);
params = new LinearLayout.LayoutParams(LayoutParams.FILL_PARENT,
LayoutParams.WRAP_CONTENT);
params.setMargins(0, 5, 5, 5);
Ll.addView(class_name,params);
tr.addView((View)Ll);
tl.addView(tr, new TableLayout.LayoutParams(
LayoutParams.FILL_PARENT,
LayoutParams.WRAP_CONTENT));
tl.removeAllViewsInLayout();
TextView section_name = new TextView(this);
section_name.setText("section_name");
section_name.setTextSize(15);
section_name.setTextColor(Color.BLUE);
section_name.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT,
LayoutParams.WRAP_CONTENT));
section_name.setPadding(5, 5, 5, 5);
section_name.setBackgroundColor(Color.RED);
Ll = new LinearLayout(this);
params = new LinearLayout.LayoutParams(LayoutParams.FILL_PARENT,
LayoutParams.WRAP_CONTENT);
params.setMargins(0, 5, 5, 5);
Ll.addView(section_name,params);
tr.addView((View)Ll);
tl.addView(tr, new TableLayout.LayoutParams(
LayoutParams.FILL_PARENT,
LayoutParams.WRAP_CONTENT));
}
@SuppressWarnings({ "rawtypes" })
public void addData(ArrayList<Users> users) {
addHeader();
for (Iterator i = users.iterator(); i.hasNext();) {
Users p = (Users) i.next();
/** Create a TableRow dynamically **/
tr = new TableRow(this);
/** Creating a TextView to add to the row **/
label = new TextView(this);
label.setText(p.getClass_id());
label.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT,
LayoutParams.WRAP_CONTENT));
label.setPadding(5, 5, 5, 5);
LinearLayout Ll = new LinearLayout(this);
LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(LayoutParams.FILL_PARENT,
LayoutParams.WRAP_CONTENT);
params.setMargins(5, 2, 2, 2);
Ll.addView(label,params);
tr.addView((View)Ll);
TextView class_name = new TextView(this);
class_name.setText(p.getClass_name());
class_name.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT,
LayoutParams.WRAP_CONTENT));
class_name.setPadding(5, 5, 5, 5);
Ll = new LinearLayout(this);
params = new LinearLayout.LayoutParams(LayoutParams.FILL_PARENT,
LayoutParams.WRAP_CONTENT);
params.setMargins(0, 3, 3, 3);
Ll.addView(class_name,params);
tr.addView((View)Ll);
tl.addView(tr, new TableLayout.LayoutParams(
LayoutParams.FILL_PARENT,
LayoutParams.WRAP_CONTENT));
TextView section_name = new TextView(this);
section_name.setText("section_name");
section_name.setTextSize(15);
section_name.setTextColor(Color.BLUE);
section_name.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT,
LayoutParams.WRAP_CONTENT));
section_name.setPadding(10, 0, 0, 0);
section_name.setBackgroundColor(Color.RED);
Ll = new LinearLayout(this);
params = new LinearLayout.LayoutParams(LayoutParams.FILL_PARENT,
LayoutParams.WRAP_CONTENT);
params.setMargins(0, 5, 5, 5);
Ll.addView(section_name,params);
tr.addView((View)Ll);
tl.addView(tr, new TableLayout.LayoutParams(
LayoutParams.FILL_PARENT,
LayoutParams.WRAP_CONTENT));
}
}
submit.php
<?php
$username ='root';
$password ='';
$hostname ='localhost';
$database ='login';
$localhost = mysql_connect($hostname,$username,$password) or trigger_error(mysql_error(),E_USER_ERROR);
mysql_select_db($database,$localhost);
$i=mysql_query("select class_id,class_name,section_name from class");
$num_rows = mysql_num_rows($i);
while($row = mysql_fetch_array($i))
{
$r[]=$row;
$check=$row['id']; }
if($check==NULL)
{
$r[$num_rows]="Record is not available";
print(json_encode($r));
}
else
{
$r[$num_rows]="success";
print(json_encode($r));
}
mysql_close($localhost);
?>
Logcat
Error parsing data org.json.JSONException: Value [{"2":"Batch A","1":"Play Group","class_id":"101","0":"101","class_name":"Play Group","section_name":"Batch A"},{"2":"Batch B","1":"Nursery","class_id":"102","0":"102","class_name":"Nursery","section_name":"Batch B"},{"2":"","1":"LKG","class_id":"103","0":"103","class_name":"LKG","section_name":""},{"2":"","1":"Ukg","class_id":"104","0":"104","class_name":"Ukg","section_name":""},{"2":"","1":"I st","class_id":"105","0":"105","class_name":"I st","section_name":""},{"2":"","1":"II","class_id":"106","0":"106","class_name":"II","section_name":""},{"2":"","1":"III","class_id":"107","0":"107","class_name":"III","section_name":""},{"2":"","1":"IV","class_id":"108","0":"108","class_name":"IV","section_name":""},{"2":"","1":"V","class_id":"109","0":"109","class_name":"V","section_name":""},{"2":"","1":"VI","class_id":"110","0":"110","class_name":"VI","section_name":""},{"2":"","1":"VII","class_id":"121","0":"121","class_name":"VII","section_name":""},{"2":"","1":"VIII","class_id":"122","0":"122","class_name":"VIII","section_name":""},{"2":"","1":"IX","class_id":"123","0":"123","class_name":"IX","section_name":""},{"2":"","1":"X","class_id":"124","0":"124","class_name":"X","section_name":""},"success"] of type org.json.JSONArray cannot be converted to JSONObject
首先，您应该将字符串转换为JSONObject，然后您可以使用关键字从JSONObject中获得JSONArray。下面的链接是关于这个的。
希望这能有所帮助。