这是我的列表视图的活动
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.layout_listview);
Bundle b = getIntent().getExtras();
categ = b.getString("category_name");
new ProgressTask(ListDataActivity.this).execute();
}
class ProgressTask extends AsyncTask<String, Void, Boolean> {
ArrayList<HashMap<String, String>> jsonlist = new ArrayList<HashMap<String, String>>();
ConnectivityManager conMgr = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
{
if (conMgr.getActiveNetworkInfo() != null
&& conMgr.getActiveNetworkInfo().isAvailable()
&& conMgr.getActiveNetworkInfo().isConnected()) {
} else {
Toast.makeText(getApplicationContext(),
"INTERNET CONNECTION NOT PRESENT", Toast.LENGTH_SHORT)
.show();
startActivity(new Intent(ListDataActivity.this,
MainActivity.class));
}
}
// private List<Message> messages;
public ProgressTask(ListActivity activity) {
context = activity;
}
private Context context;
protected void onPreExecute() {
}
@Override
protected void onPostExecute(final Boolean success) {
ListAdapter adapter = new SimpleAdapter(context, jsonlist,
R.layout.row_listitem, new String[] { name, Category },
new int[] { R.id.vehicleType, R.id.vehicleColor }) {
@Override
public View getView(int position, View convertView,
ViewGroup parent) {
if (convertView == null) {
// This a new view we inflate the new layout
LayoutInflater inflater = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = inflater.inflate(R.layout.row_listitem,
null);
}
// TODO Auto-generated method stub
if (position % 2 == 1) {
convertView.setBackgroundColor(Color.rgb(120, 151, 66));
} else {
convertView.setBackgroundColor(Color.rgb(86, 107, 129));
}
return super.getView(position, convertView, parent);
}
};
setListAdapter(adapter);
lv = getListView();
lv.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
@SuppressWarnings("unchecked")
HashMap<String, String> map = (HashMap<String, String>) lv
.getItemAtPosition(position);
String name = map.get("name");
Intent intent = new Intent(ListDataActivity.this,
DataViewActivity.class);
intent.putExtra("itemName", name);
startActivity(intent);
}
});
}
protected Boolean doInBackground(final String... args) {
baseAdapter jParser = new baseAdapter();
ArrayList<NameValuePair> postParameters = new ArrayList<NameValuePair>();
// define the parameter
postParameters.add(new BasicNameValuePair("787", categ));
try {
CustomHttpClient.executeHttpGet("787");
} catch (Exception e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
} // get JSON data from URL
url = url + postParameters;
JSONArray json = jParser.getJSONFromUrl(url);
if (json != null) {
for (int i = 0; i < json.length(); i++) {
try {
JSONObject c = json.getJSONObject(i);
String vtype = c.getString(name);
String vfuel = c.getString(Category);
HashMap<String, String> map = new HashMap<String, String>();
// Add child node to HashMap key & value
map.put(name, vtype);
map.put(Category, vfuel);
jsonlist.add(map);
} catch (JSONException e) {
e.printStackTrace();
}
}
}
return null;
}
}
baseAdapter类
public class baseAdapter {
static InputStream iStream = null;
static JSONArray jarray = null;
static String json = "";
public baseAdapter() {
}
public JSONArray getJSONFromUrl(String url) {
StringBuilder builder = new StringBuilder();
HttpClient client = new DefaultHttpClient();
HttpGet httpGet = new HttpGet(url);
try {
HttpResponse response = client.execute(httpGet);
StatusLine statusLine = response.getStatusLine();
int statusCode = statusLine.getStatusCode();
if (statusCode == 200) {
HttpEntity entity = response.getEntity();
InputStream content = entity.getContent();
BufferedReader reader = new BufferedReader(
new InputStreamReader(content));
String line;
while ((line = reader.readLine()) != null) {
builder.append(line);
}
} else {
Log.e("==>", "Failed to download file");
}
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
// Parse String to JSON object
try {
jarray = new JSONArray(builder.toString());
} catch (JSONException e) {
Log.e("JSON Parser", "Error parsing data " + e.toString());
}
// return JSON Object
return jarray;
}
这是我的PHP代码 PHP：
if(isset($_POST['787'])){
$id = $_POST['787'];
$sql = "SELECT * FROM hospitals_data where Category='$id'";
$result = mysql_query($sql);
while($row=mysql_fetch_assoc($result))
$output[]=$row;
print(json_encode($output));
mysql_close();
}
logcat的：
08-25 13:06:57.085: W/System.err(13843): java.lang.IllegalStateException: Target host must not be null, or set in parameters. scheme=null, host=null, path=787
08-25 13:06:57.085: W/System.err(13843): at org.apache.http.impl.client.DefaultRequestDirector.determineRoute(DefaultRequestDirector.java:591)
08-25 13:06:57.085: W/System.err(13843): at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:293)
08-25 13:06:57.085: W/System.err(13843): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:591)
08-25 13:06:57.085: W/System.err(13843): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:510)
08-25 13:06:57.085: W/System.err(13843): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:488)
08-25 13:06:57.085: W/System.err(13843): at com.example.careandcure.CustomHttpClient.executeHttpGet(CustomHttpClient.java:158)
08-25 13:06:57.085: W/System.err(13843): at com.example.careandcure.ListDataActivity$ProgressTask.doInBackground(ListDataActivity.java:143)
08-25 13:06:57.085: W/System.err(13843): at com.example.careandcure.ListDataActivity$ProgressTask.doInBackground(ListDataActivity.java:1)
08-25 13:06:57.085: W/System.err(13843): at android.os.AsyncTask$2.call(AsyncTask.java:264)
08-25 13:06:57.085: W/System.err(13843): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
08-25 13:06:57.085: W/System.err(13843): at java.util.concurrent.FutureTask.run(FutureTask.java:137)
08-25 13:06:57.085: W/System.err(13843): at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:208)
08-25 13:06:57.085: W/System.err(13843): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
08-25 13:06:57.095: W/System.err(13843): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
08-25 13:06:57.095: W/System.err(13843): at java.lang.Thread.run(Thread.java:864)
08-25 13:06:57.095: W/dalvikvm(13843): threadid=11: thread exiting with uncaught exception (group=0x40aa8228)
08-25 13:06:57.105: E/AndroidRuntime(13843): FATAL EXCEPTION: AsyncTask #1
08-25 13:06:57.105: E/AndroidRuntime(13843): java.lang.RuntimeException: An error occured while executing doInBackground()
08-25 13:06:57.105: E/AndroidRuntime(13843): at android.os.AsyncTask$3.done(AsyncTask.java:278)
08-25 13:06:57.105: E/AndroidRuntime(13843): Caused by: java.lang.IllegalArgumentException: Illegal character in path at index 34: http://172.16.0.118/jsonscript.php[787=general]
08-25 13:06:57.105: E/AndroidRuntime(13843): at java.net.URI.create(URI.java:727)
08-25 13:06:57.105: E/AndroidRuntime(13843): at org.apache.http.client.methods.HttpGet.<init>(HttpGet.java:75)
08-25 13:06:57.105: E/AndroidRuntime(13843): at com.example.careandcure.baseAdapter.getJSONFromUrl(baseAdapter.java:33)
08-25 13:06:57.105: E/AndroidRuntime(13843): at com.example.careandcure.ListDataActivity$ProgressTask.doInBackground(ListDataActivity.java:149)
08-25 13:06:57.105: E/AndroidRuntime(13843): at com.example.careandcure.ListDataActivity$ProgressTask.doInBackground(ListDataActivity.java:1)
08-25 13:06:57.105: E/AndroidRuntime(13843): at android.os.AsyncTask$2.call(AsyncTask.java:264)
08-25 13:06:57.105: E/AndroidRuntime(13843): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
我从之前的活动中获得字符串category_name。
我需要解析这个字符串到PHP，以便我可以查询字符串基础上的项目..
尝试通过添加parm传递这种方式，但提前得到错误.. thanx ..
答案 0 :(得分：0)
此解决方案基于您的旧代码，没有postParameters
好的，这就是你需要做的事情
1-将类别声明为活动中的全局变量
String categ = "";
@Override
protected void onCreate(Bundle savedInstanceState) {
:
:
2-保持代码以分配类别categ = b.getString("category_name");
3- at doInBackground()，将新的param category_name连接到URL：
protected Boolean doInBackground(final String... args) {
url = url + "?cat_name=" + categ;
:
:
:
cat_name并使用它来获取数据
:
:
$catName = $_GET['cat_name'];
:
:
如果我找对你，这就是你要找的。