我有一个应用程序从PHP文件中提取数据，然后解析JSON返回并将数据放入列表中。在通过USB插入的手机上从Android工作室运行应用程序时，该应用程序100％正常工作。但是，当我构建应用程序的签名版本时，该活动不再有效。因此应用程序打开，我可以在搜索字段中输入一个数字，但是当我点击运行该活动的提交时，应用程序崩溃。
活动代码：
package com.*.*;
import android.app.ProgressDialog;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import android.widget.Toast;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.util.ArrayList;
import java.util.HashMap;
public class ViewBalances extends AppCompatActivity {
private String TAG = ViewBalances.class.getSimpleName();
private ProgressDialog pDialog;
private ListView lv;
ArrayList<HashMap<String, String>> contactList;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_view_balances);
contactList = new ArrayList<>();
lv = (ListView) findViewById(R.id.list);
new GetContacts().execute();
}
/**
* Async task class to get json by making HTTP call
*/
private class GetContacts extends AsyncTask<Void, Void, Void> {
@Override
protected void onPreExecute() {
super.onPreExecute();
// Showing progress dialog
pDialog = new ProgressDialog(ViewBalances.this);
pDialog.setMessage("Please wait...");
pDialog.setCancelable(false);
pDialog.show();
}
@Override
protected Void doInBackground(Void... arg0) {
HttpHandler sh = new HttpHandler();
Intent inte = getIntent();
String memnum = inte.getExtras().getString("membernumber_input");
// Making a request to url and getting response
String url = "****";
String jsonStr = sh.makeServiceCall(url +memnum);
Log.e(TAG, "Response from url: " + jsonStr);
if (jsonStr != null) {
try {
JSONObject jsonObj = new JSONObject(jsonStr);
// Getting JSON Array node
JSONArray contacts = jsonObj.getJSONArray("contacts");
// looping through All Contacts
for (int i = 0; i < contacts.length(); i++) {
JSONObject c = contacts.getJSONObject(i);
String Savings_Amount = c.getString("Savings_Amount");
String name = c.getString("name");
String member_number = c.getString("member_number");
String phone_office = c.getString("phone_office");
// tmp hash map for single contact
HashMap<String, String> contact = new HashMap<>();
// adding each child node to HashMap key => value
contact.put("Savings_Amount", Savings_Amount);
contact.put("name", name);
contact.put("CellNo", phone_office);
contact.put("member_number", member_number);
// adding contact to contact list
contactList.add(contact);
}
} catch (final JSONException e) {
Log.e(TAG, "Json parsing error: " + e.getMessage());
runOnUiThread(new Runnable() {
@Override
public void run() {
Toast.makeText(getApplicationContext(),
"Json parsing error: " + e.getMessage(),
Toast.LENGTH_LONG)
.show();
}
});
}
} else {
Log.e(TAG, "Couldn't get json from server.");
runOnUiThread(new Runnable() {
@Override
public void run() {
Toast.makeText(getApplicationContext(),
"Couldn't get json from server. Check LogCat for possible errors!",
Toast.LENGTH_LONG)
.show();
}
});
}
return null;
}
@Override
protected void onPostExecute(Void result) {
super.onPostExecute(result);
// Dismiss the progress dialog
if (pDialog.isShowing())
pDialog.dismiss();
/**
* Updating parsed JSON data into ListView
* */
ListAdapter adapter = new SimpleAdapter(
ViewBalances.this, contactList,
R.layout.list_item, new String[]{"name", "Savings_Amount", "member_number", "CellNo"}, new int[]{R.id.name, R.id.Savings_Amount, R.id.member_number, R.id.CellNo});
lv.setAdapter(adapter);
}
}
}
希望有人可以帮助我......？请？
错误：
09-21 13:20:41.814 13880-13880/? E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.caliber.caliberclinicalconsultants, PID: 13880
java.lang.IllegalStateException: Could not find method ViewBalResult(View) in a parent or ancestor Context for android:onClick attribute defined on view class android.support.v7.widget.AppCompatButton with id 'submit'
at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.resolveMethod(AppCompatViewInflater.java:321)
at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:280)
at android.view.View.performClick(View.java:5697)
at android.widget.TextView.performClick(TextView.java:10826)
at android.view.View$PerformClick.run(View.java:22526)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:158)
at android.app.ActivityThread.main(ActivityThread.java:7224)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)
09-21 13:20:41.824 776-1626/? W/ActivityManager: Force finishing activity com.caliber.caliberclinicalconsultants/.MainActivity
答案 0 :(得分：1)
在大多数情况下，原因是Proguard。
你必须检查你使用的proguard文件和类。
答案 1 :(得分：1)
使用以下代码更新您的Proguard文件。
public Bitmap savebit(){
Bitmap saveBitmap = Bitmap.createBitmap(this.getWidth(), this.getHeight(), Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(saveBitmap);
canvas.setBitmap(saveBitmap);
this.draw(canvas);
File file = new File(Environment.getExternalStorageDirectory() + "/sign.jpg");
try {
saveBitmap.compress(Bitmap.CompressFormat.JPEG, 100, new FileOutputStream(file));
} catch (Exception e) {
e.printStackTrace();
}
return saveBitmap;
}