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我是 android 新手,我创建了一个简单的数据获取应用程序。我从我的 php 文件中获取两个变量,但我只获取一个变量的值。当我在浏览器中测试时,我同时获取两个变量值在 json 中。
代码:
public class MainActivity extends Activity{
ArrayList<Person> arrayofWebData = new ArrayList<Person>();
class Person {
boolean messageReceived;
public String message;
public String message_recd;
public String message_sent;
}
FancyAdapter aa = null;
static ArrayList<String> resultRow;
public void onCreate(Bundle savedInstanceState){
try{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
if (android.os.Build.VERSION.SDK_INT > 9) {
StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(policy);
}
String result = "";
try{
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost("http://10.0.2.2/progress_card/messages/get_messages.php");
HttpResponse response = httpclient.execute(httppost);
HttpEntity entity = response.getEntity();
InputStream webs = entity.getContent();
try{
BufferedReader reader = new BufferedReader(new InputStreamReader(webs, "UTF-8"), 8);
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null){
sb.append(line+"\n");
}
webs.close();
result = sb.toString();
}catch(Exception e){
Log.e("log_tag", "Error Converting Result "+e.toString());
}
}catch(Exception e){
Log.e("log_tag", "Error Converting Result "+e.toString());
}
try{
JSONArray jArray = new JSONArray(result);
for(int i=0;i<jArray.length();i++){
JSONObject json_data = jArray.getJSONObject(i);
Person resultRow = new Person();
if (json_data.has("message_recd")){
resultRow.messageReceived = true;
resultRow.message = json_data.getString("message_recd");
}
if (json_data.has("message_sent")){
resultRow.messageReceived = false;
resultRow.message = json_data.getString("message_sent");
}
arrayofWebData.add(resultRow);
//...
//aa = new FancyAdapter();
//...
}
}
catch(JSONException e){
Log.e("log_tag", "Error Converting Result "+e.toString());
}
ListView myListView = (ListView)findViewById(R.id.myListView);
aa = new FancyAdapter(this,arrayofWebData);
myListView.setAdapter(aa);
}
catch(Exception e){
Log.e("log_tag", "Error Converting Result "+e.toString());
e.printStackTrace();
}
}
class FancyAdapter extends ArrayAdapter<Person>{
FancyAdapter(Activity activity, ArrayList<Person> list){
super(activity,android.R.layout.simple_expandable_list_item_1,list);
}
public View getView(int position,View convertView,ViewGroup parent){
Person selectedPerson = getItem(position);
ViewHolder holder;
if(convertView == null){
LayoutInflater inflater = getLayoutInflater();
convertView = inflater.inflate(R.layout.row, null);
holder = new ViewHolder(convertView,selectedPerson.messageReceived);
convertView.setTag(holder);
}
else{
holder = (ViewHolder)convertView.getTag();
}
holder.populateFrom(selectedPerson);
return(convertView);
}
}
class ViewHolder{
public TextView message = null;
ViewHolder(View row,boolean messageReceived){
if(messageReceived)
message = (TextView)row.findViewById(R.id.name);
else
message = (TextView)row.findViewById(R.id.colors);
}
void populateFrom(Person p){
message.setText(p.message);
}
}
}
日志:
10-02 08:27:05.611: E/AndroidRuntime(2045): FATAL EXCEPTION: main
10-02 08:27:05.611: E/AndroidRuntime(2045): Process: com.shirish.hello, PID: 2045
10-02 08:27:05.611: E/AndroidRuntime(2045): java.lang.NullPointerException
10-02 08:27:05.611: E/AndroidRuntime(2045): at com.shirish.hello.MainActivity$ViewHolder.populateFrom(MainActivity.java:153)
10-02 08:27:05.611: E/AndroidRuntime(2045): at com.shirish.hello.MainActivity$FancyAdapter.getView(MainActivity.java:136)
10-02 08:27:05.611: E/AndroidRuntime(2045): at android.widget.AbsListView.obtainView(AbsListView.java:2255)
10-02 08:27:05.611: E/AndroidRuntime(2045): at android.widget.ListView.makeAndAddView(ListView.java:1790)
10-02 08:27:05.611: E/AndroidRuntime(2045): at android.widget.ListView.fillDown(ListView.java:691)
10-02 08:27:05.611: E/AndroidRuntime(2045): at android.widget.ListView.fillFromTop(ListView.java:752)
10-02 08:27:05.611: E/AndroidRuntime(2045): at android.widget.ListView.layoutChildren(ListView.java:1630)
10-02 08:27:05.611: E/AndroidRuntime(2045): at android.widget.AbsListView.onLayout(AbsListView.java:2087)
10-02 08:27:05.611: E/AndroidRuntime(2045): at android.view.View.layout(View.java:14817)
10-02 08:27:05.611: E/AndroidRuntime(2045): at android.view.ViewGroup.layout(ViewGroup.java:4631)
10-02 08:27:05.611: E/AndroidRuntime(2045): at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1671)
10-02 08:27:05.611: E/AndroidRuntime(2045): at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1525)
10-02 08:27:05.611: E/AndroidRuntime(2045): at android.widget.LinearLayout.onLayout(LinearLayout.java:1434)
10-02 08:27:05.611: E/AndroidRuntime(2045): at android.view.View.layout(View.java:14817)
10-02 08:27:05.611: E/AndroidRuntime(2045): at android.view.ViewGroup.layout(ViewGroup.java:4631)
10-02 08:27:05.611: E/AndroidRuntime(2045): at android.widget.FrameLayout.layoutChildren(FrameLayout.java:453)
10-02 08:27:05.611: E/AndroidRuntime(2045): at android.widget.FrameLayout.onLayout(FrameLayout.java:388)
10-02 08:27:05.611: E/AndroidRuntime(2045): at android.view.View.layout(View.java:14817)
10-02 08:27:05.611: E/AndroidRuntime(2045): at android.view.ViewGroup.layout(ViewGroup.java:4631)
10-02 08:27:05.611: E/AndroidRuntime(2045): at com.android.internal.widget.ActionBarOverlayLayout.onLayout(ActionBarOverlayLayout.java:374)
10-02 08:27:05.611: E/AndroidRuntime(2045): at android.view.View.layout(View.java:14817)
10-02 08:27:05.611: E/AndroidRuntime(2045): at android.view.ViewGroup.layout(ViewGroup.java:4631)
10-02 08:27:05.611: E/AndroidRuntime(2045): at android.widget.FrameLayout.layoutChildren(FrameLayout.java:453)
10-02 08:27:05.611: E/AndroidRuntime(2045): at android.widget.FrameLayout.onLayout(FrameLayout.java:388)
10-02 08:27:05.611: E/AndroidRuntime(2045): at android.view.View.layout(View.java:14817)
10-02 08:27:05.611: E/AndroidRuntime(2045): at android.view.ViewGroup.layout(ViewGroup.java:4631)
10-02 08:27:05.611: E/AndroidRuntime(2045): at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:1983)
10-02 08:27:05.611: E/AndroidRuntime(2045): at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1740)
10-02 08:27:05.611: E/AndroidRuntime(2045): at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:996)
10-02 08:27:05.611: E/AndroidRuntime(2045): at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5600)
10-02 08:27:05.611: E/AndroidRuntime(2045): at android.view.Choreographer$CallbackRecord.run(Choreographer.java:761)
10-02 08:27:05.611: E/AndroidRuntime(2045): at android.view.Choreographer.doCallbacks(Choreographer.java:574)
10-02 08:27:05.611: E/AndroidRuntime(2045): at android.view.Choreographer.doFrame(Choreographer.java:544)
10-02 08:27:05.611: E/AndroidRuntime(2045): at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:747)
10-02 08:27:05.611: E/AndroidRuntime(2045): at android.os.Handler.handleCallback(Handler.java:733)
10-02 08:27:05.611: E/AndroidRuntime(2045): at android.os.Handler.dispatchMessage(Handler.java:95)
10-02 08:27:05.611: E/AndroidRuntime(2045): at android.os.Looper.loop(Looper.java:136)
10-02 08:27:05.611: E/AndroidRuntime(2045): at android.app.ActivityThread.main(ActivityThread.java:5001)
10-02 08:27:05.611: E/AndroidRuntime(2045): at java.lang.reflect.Method.invokeNative(Native Method)
10-02 08:27:05.611: E/AndroidRuntime(2045): at java.lang.reflect.Method.invoke(Method.java:515)
10-02 08:27:05.611: E/AndroidRuntime(2045): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)
10-02 08:27:05.611: E/AndroidRuntime(2045): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
10-02 08:27:05.611: E/AndroidRuntime(2045): at dalvik.system.NativeStart.main(Native Method)
浏览器中的 Json 响应:
[{"message_recd":"checking"},{"message_recd":"qwerty"},{"message_recd":"checking"},{"message_recd":"qw,nsbdf"},{"message_recd":"rtr"},{"message_recd":"QSDWFDWDF"},{"message_recd":"as"},{"message_recd":"sdad"},{"message_recd":"checking12345"},{"message_sent":"hey whtas up"},{"message_sent":"hey whtas up hey whtas "},{"message_sent":"hey whtas up test"},{"message_sent":"hey whtas up11"}]
我的 php 代码:
<?php
error_reporting(0);
define('HOST','localhost');
define('USER','root');
define('PASS','');
define('DB','progress_card');
$con = mysqli_connect(HOST,USER,PASS,DB);
$req_dump = print_r($_POST, TRUE);
$fp = fopen('request.txt', 'a');
fwrite($fp, $req_dump);
fclose($fp);
//$username = $_POST['username'];
$sql1 = "select * from student_detail where parentusername='suyash1'";//username = suyash1
$res1 = mysqli_query($con,$sql1);
$row1=mysqli_fetch_array($res1);
$cl=$row1['class']."-".$row1['section'];
$sql2="select * from teachers where classassign='$cl'";
$res2 = mysqli_query($con,$sql2);
$row2=mysqli_fetch_array($res2);
$to=$row2['email'];
$from=$row1['parentemail'];
$result = array();
$sql = "select * from messages where (to_email='".$to."' and from_email='".$from."') OR (from_email='".$to."' and to_email='".$from."') ORDER BY post_date asc";
$res = mysqli_query($con,$sql);
while($row = mysqli_fetch_array($res))
{
if($row['to_email']==$to)
array_push($result,array('message_recd'=>$row['message']));
else if($row['to_email']==$from)
array_push($result,array('message_sent'=>$row['message']));
}
/*$sql = "select * from messages where to_email='".$to."' and from_email='".$from."' ORDER BY post_date asc";
$res = mysqli_query($con,$sql);
while($row = mysqli_fetch_array($res))
{
array_push($result,array('message_recd'=>$row['message']));
}
$sqlw = "select * from messages where from_email='".$to."' and to_email='".$from."' ORDER BY post_date asc";
$resw = mysqli_query($con,$sqlw);
while($row5 = mysqli_fetch_array($resw))
{
array_push($result,array('message_sent'=>$row5['message']));
}*/
if(mysqli_query($con,$sql))
{
// echo 'success';
}
else
{
//echo 'failure';
}
//array_push($result,array('message_sent'=>"dfdsghdfgddfgdsd"));
//array_push($result,array('message_sent'=>"sfdsflkufhskfhdskjfsfssadfadsffsafasfsfsadfafsaf"));
//array_push($result,array('message_recd'=>$row1['parentemail'],'message_sent'=>$row2['email']));
//print_r($ress);
echo json_encode($result);
mysqli_close($con);
?>
最佳答案
我对你的代码做了一些修改,但你还必须在异步任务中获取数据
class Person {
boolean messageReceived;
public String message;
}
public void onCreate(Bundle savedInstanceState){
///...
for(int i=0;i<jArray.length();i++){
JSONObject json_data = jArray.getJSONObject(i);
Person resultRow = new Person();
if (json_data.has("message_recd")){
resultRow.messageReceived = true;
resultRow.message = json_data.getString("message_recd");
}
else if (json_data.has("message_sent")){
resultRow.messageReceived = false;
resultRow.message = json_data.getString("message_sent");
}
arrayofWebData.add(resultRow);
//...
//aa = new FancyAdapter();
aa = new FancyAdapter(this,arrayofWebData);
//...
}
class FancyAdapter extends ArrayAdapter<Person>{
FancyAdapter(Activity activity, ArrayList<Person> list){
super(activity,R.layout.row,list);
}
public View getView(int position,View convertView,ViewGroup parent){
Person selectedPerson = getItem(position);
ViewHolder holder;
if(convertView == null){
LayoutInflater inflater = getLayoutInflater();
convertView = inflater.inflate(R.layout.row, null);
holder = new ViewHolder(convertView);
convertView.setTag(holder);
}
else{
holder = (ViewHolder)convertView.getTag();
}
holder.populateFrom(selectedPerson);
return(convertView);
}
}
class ViewHolder{
public TextView messageReceived = null;
public TextView messageSend = null;
ViewHolder(View row){
messageReceived = (TextView)row.findViewById(R.id.name);
messageSend = (TextView)row.findViewById(R.id.colors);
}
void populateFrom(Person p){
if(p!=null && message !=null){
if(p.messageReceived){
messageReceived.setText(p.message);
messageSend.setVisibility(View.INVISIBLE);
}else{
messageSend.setText(p.message);
messageReceived.setVisibility(View.INVISIBLE);
}
message.setText(p.message);
}
}
}
PHP 部分
我相信你有你的时间戳列命名为时间戳
改变那个
$sql = "select * from messages where to_email='".$to."' and from_email='".$from."'";
$res = mysqli_query($con,$sql);
while($row = mysqli_fetch_array($res))
{
array_push($result,array('message_recd'=>$row['message']));
}
$sqlw = "select * from messages where from_email='".$to."' and to_email='".$from."'";
$resw = mysqli_query($con,$sqlw);
while($row5 = mysqli_fetch_array($resw))
{
array_push($result,array('message_sent'=>$row5['message']));
}
那个
$sql = "select * from messages where (to_email='".$to."' and from_email='".$from."') OR (from_email='".$to."' and to_email='".$from."') ORDER BY timestamp";
$res = mysqli_query($con,$sql);
while($row = mysqli_fetch_array($res))
{
if($row['to_email']==$to)
array_push($result,array('message_recd'=>$row['message']));
else if($row['to_email']==$from)
array_push($result,array('message_sent'=>$row['message']));
}
关于php - 如何从php文件中获取android中的Json数据?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/32905297/
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