[英]How to return or reuse response value of Volley library in android studio?
public class MainActivity extends AppCompatActivity {
private static final String url = "https://www.googleapis.com/books/v1/volumes?q=android&maxResults=1";
private static String data ="";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final StringRequest request = new StringRequest(url, new Response.Listener<String>() {
@Override
public void onResponse(String response) {
data=data + response.substring(0);
Log.d("CODE1",response);
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
Toast.makeText(MainActivity.this,"Something went wrong",Toast.LENGTH_SHORT).show();
}
});
RequestQueue queue = Volley.newRequestQueue(this);
queue.add(request);
TextView text = (TextView) findViewById(R.id.text_view);
text.setText(data);
}
}
我正在嘗試在 onCreate function 末尾使用 onResponse function 的“響應”值。 如您所見,數據已分配給 TEXTVIEW 但未顯示。 我們如何將響應中的數據傳遞給其他數據結構,然后用於其他工作?
像這樣使用:
data=data + response.substring(0);
Log.d("CODE1",response);
text.setText(data);
因為,這條線(setText)在您發送請求之前運行。 您顯示了空數據。
將setText
方法移入onResponse
您的代碼將如下所示:
TextView text = (TextView) findViewById(R.id.text_view);
final StringRequest request = new StringRequest(url, new Response.Listener<String>() {
@Override
public void onResponse(String response) {
Log.d("CODE1",response);
text.setText(response);
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
Toast.makeText(MainActivity.this,"Something went wrong",Toast.LENGTH_SHORT).show();
}
});
RequestQueue queue = Volley.newRequestQueue(this);
queue.add(request);
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