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我有一個問題，我不知道如何通過我的setter和getter將我的json解析放在textView上。 我知道如何把我的json放在listView上，我顯示他但不是在TextView上顯示我的代碼。Android Studio解析TextView
該類代表我的佈局，列表視圖，但我把文本視圖測試
public class AfficheurListView extends AppCompatActivity {
String json_string;
JSONObject jObj = null;
ValeursAdapter valeursAdapter;
TextView textView;
Valeurs valeurss;
ListView listView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.display_listview_layout);
json_string=getIntent().getExtras().getString("json_data");
listView =(ListView)findViewById(R.id.listview);
textView=(TextView)findViewById(R.id.textView4);
valeursAdapter=new ValeursAdapter(this,R.layout.new_layout);
listView.setAdapter(valeursAdapter);
textView.setText(valeurss.getMpx());
try {
/*
Tab json []
jsonObject=new JSONObject(json_string);
jsonArray=jsonObject.getJSONArray("server_reponse");
int count=0 ;*/
// Json Object {}
String mpx,rds,al,ar,frequence,pilots,id,id_SIGFOX,timestamps,rf;
jObj = new JSONObject(json_string);
mpx= jObj.getString("MPX");
rds =jObj.getString("RDS");
rf=jObj.getString("RF");
frequence =jObj.getString("Frequence");
timestamps=jObj.getString("timestamp");
id= jObj.getString("id");
id_SIGFOX= jObj.getString("id_SIGFOX");
pilots= jObj.getString("PILOT");
al= jObj.getString("a_l");
ar= jObj.getString("a_r");
Valeurs valeurs=new Valeurs(mpx,rds,al,ar,frequence,pilots,id,timestamps,id_SIGFOX,rf);
valeursAdapter.add(valeurs);
//textView.setText(valeurss.getMpx());
} catch (JSONException e) {
e.printStackTrace();}
}
}
這個類是我的變量的getter和setter：
public class Valeurs{
private String mpx,rds,al,ar,pilots,frequence,id,timestamps,id_SIGFOX,rf;
public Valeurs(String mpx, String rds, String al, String ar, String pilots, String frequence, String id, String timestamps, String id_SIGFOX, String rf)
{
this.setMpx(mpx);
this.setRds(rds);
this.setAl(al);
this.setAr(ar);
this.setPilots(pilots);
this.setFrequence(frequence);
this.setId(id);
this.setTimestamps(timestamps);
this.setId_SIGFOX(id_SIGFOX);
this.setRf(rf);
}
public String getMpx() {
return mpx;
}
public void setMpx(String mpx) {
this.mpx = mpx;
}
public String getRds() {
return rds;
}
public void setRds(String rds) {
this.rds = rds;
}
public String getAl() {
return al;
}
public void setAl(String al) {
this.al = al;
}
public String getAr() {
return ar;
}
public void setAr(String ar) {
this.ar = ar;
}
public String getPilots() {
return pilots;
}
public void setPilots(String pilots) {
this.pilots = pilots;
}
public String getFrequence() {
return frequence;
}
public void setFrequence(String frequence) {
this.frequence = frequence;
}
public String getTimestamps() {
return timestamps;
}
public void setTimestamps(String timestamps) {
this.timestamps = timestamps;
}
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getId_SIGFOX() {
return id_SIGFOX;
}
public void setId_SIGFOX(String id_SIGFOX) {
this.id_SIGFOX = id_SIGFOX;
}
public String getRf() {
return rf;
}
public void setRf(String rf) {
this.rf = rf;
}
}
該類把我的變量上我的lisView的新佈局：
public class ValeursAdapter extends ArrayAdapter{
List list=new ArrayList<>();
public ValeursAdapter(Context context, int resource) {
super(context, resource);
}
public void add(Valeurs object) {
super.add(object);
list.add(object);
}
@Override
public int getCount() {
return list.size();
}
@Nullable
@Override
public Object getItem(int position) {
return list.get(position);
}
@NonNull
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View row;
row=convertView;
ValeursDefini valeursDefini;
if(row==null)
{
LayoutInflater layoutInflater=(LayoutInflater)this.getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
row=layoutInflater.inflate(R.layout.new_layout,parent,false);
valeursDefini=new ValeursDefini();
valeursDefini.tx_mpx=(TextView)row.findViewById(R.id.tx_mpx);
valeursDefini.tx_al=(TextView)row.findViewById(R.id.tx_al);
valeursDefini.tx_ar=(TextView)row.findViewById(R.id.tx_ar);
valeursDefini.tx_rds=(TextView)row.findViewById(R.id.tx_rds);
valeursDefini.tx_frequence=(TextView)row.findViewById(R.id.tx_frequence);
valeursDefini.tx_pilots=(TextView)row.findViewById(R.id.tx_pilots);
row.setTag(valeursDefini);
}
else {
valeursDefini=(ValeursDefini)row.getTag();
}
Valeurs valeurs= (Valeurs) this.getItem(position);
valeursDefini.tx_mpx.setText(valeurs.getMpx()+"--");
valeursDefini.tx_rds.setText(valeurs.getRds()+"--");
valeursDefini.tx_al.setText(valeurs.getAl()+"--");
valeursDefini.tx_ar.setText(valeurs.getAr()+"--");
valeursDefini.tx_pilots.setText(valeurs.getPilots()+"--");
valeursDefini.tx_frequence.setText(valeurs.getFrequence()+"--");
return row;
}
static class ValeursDefini
{
TextView tx_mpx,tx_rds,tx_al,tx_ar,tx_frequence,tx_pilots;
}
}
日誌：
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.suprem.myapplication, PID: 2288
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.suprem.myapplication/com.suprem.myapplication.AfficheurListView}: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String com.suprem.myapplication.Valeurs.getMpx()' on a null object reference
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2325)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2387)
at android.app.ActivityThread.access$800(ActivityThread.java:151)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1303)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5254)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String com.suprem.myapplication.Valeurs.getMpx()' on a null object reference
at com.suprem.myapplication.AfficheurListView$override.onCreate(AfficheurListView.java:36)
at com.suprem.myapplication.AfficheurListView$override.access$dispatch(AfficheurListView.java)
at com.suprem.myapplication.AfficheurListView.onCreate(AfficheurListView.java:0)
at android.app.Activity.performCreate(Activity.java:5990)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1106)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2278)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2387)
at android.app.ActivityThread.access$800(ActivityThread.java:151)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1303)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5254)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
我想在textView4上顯示我的變量mpx，通過使用我的類Valeur獲得mpx在getter 上的值。