我正在尝试构建一个应用程序，该应用程序可以将来自先前活动的输入粘贴并显示来自数据库的一些内容（当按下ButtonGet时有效）。问题是，在我尝试运行项目时，我收到Java.lang.IllegalStateException: Already attached。我的代码有什么问题？
package br.exemplozxingintegration;
import android.annotation.SuppressLint;
import android.app.ProgressDialog;
import android.content.ClipData;
import android.content.ClipboardManager;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
import com.android.volley.RequestQueue;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.StringRequest;
import com.android.volley.toolbox.Volley;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
public class SecondActivity extends AppCompatActivity implements View.OnClickListener {
private EditText pastetext;
private ClipboardManager myClipboard;
private ClipData myClip;
private Button btn;
private EditText textView1;
private Button buttonGet;
private TextView textViewResult;
private ProgressDialog loading;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_second);
myClipboard = (ClipboardManager) getSystemService(CLIPBOARD_SERVICE);
pastetext = (EditText) findViewById(R.id.textView1);
btn = (Button)findViewById(R.id.buttonPaste);
btn.performClick();
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
textView1 = (EditText) findViewById(R.id.textView1);
buttonGet = (Button) findViewById(R.id.buttonGet);
textViewResult = (TextView) findViewById(R.id.textViewResult);
buttonGet.setOnClickListener(this);
}
@SuppressLint("NewApi")
public void paste(View view) {
ClipData cp = myClipboard.getPrimaryClip();
ClipData.Item item = cp.getItemAt(0);
String text = item.getText().toString();
pastetext.setText(text);
Toast.makeText(getApplicationContext(), "Text Pasted",
Toast.LENGTH_SHORT).show();
}
private void getData() {
String id = textView1.getText().toString().trim();
if (id.equals("")) {
Toast.makeText(this, "", Toast.LENGTH_LONG).show();
return;
}
loading = ProgressDialog.show(this,"Please wait...","Fetching...",false,false);
String url = Config.DATA_URL+textView1.getText().toString().trim();
StringRequest stringRequest = new StringRequest(url, new Response.Listener<String>() {
@Override
public void onResponse(String response) {
loading.dismiss();
showJSON(response);
}
},
new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
Toast.makeText(SecondActivity.this,error.getMessage().toString(),Toast.LENGTH_LONG).show();
}
});
RequestQueue requestQueue = Volley.newRequestQueue(this);
requestQueue.add(stringRequest);
}
private void showJSON(String response){
String name="";
String image = "";
try {
JSONObject jsonObject = new JSONObject(response);
JSONArray result = jsonObject.getJSONArray(Config.JSON_ARRAY);
JSONObject collegeData = result.getJSONObject(0);
name = collegeData.getString(Config.KEY_NAME);
image = collegeData.getString(Config.KEY_IMAGE);
} catch (JSONException e) {
e.printStackTrace();
}
textViewResult.setText("Name:\t"+name+"\nImagine :\t"+ image);
}
@Override
public void onClick(View v) {
getData();
}
}