我有下一個問題，我嘗試將Arraylist<string>值從 AsyncTask 類發送到其他類調用圖形，但我不知道我做錯了什么以及如何Arraylist<string>在另一個類中獲取值，因為我的代碼有很多 sintaxis 錯誤異步任務類public class fetch extends AsyncTask<Void,Void,ArrayList<String>> { //v funcional @RequiresApi(api = Build.VERSION_CODES.KITKAT) @Override protected ArrayList<String> doInBackground(Void... voids) { String Id =""; String Time =""; String Pressure=""; ArrayList<String> IdArray = new ArrayList<String>(); ArrayList<String> TimeArray = new ArrayList<String>(); ArrayList<String> PressureArray = new ArrayList<String>(); String IdS=""+IdArray; String TimeS=""+TimeArray; String PresureS=""+PressureArray; data.set(1,TimeS); data.set(2,TimeS); data.set(3,TimeS); return data; } @Override protected void onPostExecute(ArrayList<String> result){ super.onPostExecute(result); Graphics.data.setText(data); }}圖形類 public class Graphics extends AppCompatActivity { public static TextView data; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.graphics); Button firstButton = (Button) findViewById(R.id.json); data = (TextView) findViewById(R.id.msgTxt); firstButton.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { fetch process = new fetch(); ArrayList<String> data= process.execute(); data.get(1); } }); }
2 回答
慕的地10843
TA貢獻1785條經驗 獲得超8個贊
您可以創建一個由您的“圖形”實現的接口，并將其傳遞給您的AsyncTask班級。像這樣
public interface BlaBlaBla {
void doBla(ArrayList<String> myBla);
}
并在您的“圖形”中：
class Graphics extends AppCompatActivity implements BlaBlaBla {
fetch process = new fetch(this);
}
對于 asyncClass ：
public class fetch extends AsyncTask<Void,Void,ArrayList<String>> {
//constructor
BlaBlaBla bla;
public fetch(BlaBlaBla bla){
this.bla=bla;
}
//when your task is complete use bla.doBla(pass your array here);
}
蠱毒傳說
TA貢獻1895條經驗 獲得超3個贊
我的解決方案 Fetch 類
public class Fetch extends AsyncTask<Void,Void,String[][]> {
public static int KEY = 0;
@RequiresApi(api = Build.VERSION_CODES.KITKAT)
@Override
protected String[][] doInBackground(Void... voids) {
HttpHandler sh = new HttpHandler();
String url = "http:xxxxxxx/xxx.json";
String jsonStr = sh.makeServiceCall(url);
JSONObject jsonObj = null;
try {
jsonObj = new JSONObject(jsonStr);
int nTiempos=jsonObj.length();
String[] IdKeyArray = new String[nTie];
for (int i = 0; i < jsonObj.length(); i++) {
JSONObject c = jsonObj.getJSONObject(String.valueOf(i));
IdKeyArray[i] = c.getString("Key");
String[][] valores={IdKeyArray};
return valores;
} catch (JSONException e) {
e.printStackTrace();
}
return null;
}
}
這是我獲取值的另一個類的“調用”
private String[][] valores;
Fetch process = new Fetch();
process.execute();
try {
valores=process.get();
} catch (ExecutionException e) {
e.printStackTrace();
} catch (InterruptedException e) {
e.printStackTrace();
}
pm.setText(String.valueOf(valores[Fetch.Key][0]));
}
}
}
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