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錯誤和聊天活動對話框如下所示。無法實例化活動：class com.pz.mediatonmessanger.ChatDialogActivity沒有零參數構造函數
04-09 09:03:23.509 2722-2722/com.pz.mediatonmessanger E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.pz.mediatonmessanger, PID: 2722
java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.pz.mediatonmessanger/com.pz.mediatonmessanger.ChatDialogActivity}: java.lang.InstantiationException: class com.pz.mediatonmessanger.ChatDialogActivity has no zero argument constructor
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2209)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2360)
at android.app.ActivityThread.access$800(ActivityThread.java:144)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1278)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5221)
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:899)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
Caused by: java.lang.InstantiationException: class com.pz.mediatonmessanger.ChatDialogActivity has no zero argument constructor
at java.lang.Class.newInstance(Class.java:1563)
at android.app.Instrumentation.newActivity(Instrumentation.java:1065)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2199)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2360)
at android.app.ActivityThread.access$800(ActivityThread.java:144)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1278)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5221)
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:899)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
Caused by: java.lang.NoSuchMethodException: <init> []
at java.lang.Class.getConstructor(Class.java:531)
at java.lang.Class.getDeclaredConstructor(Class.java:510)
at java.lang.Class.newInstance(Class.java:1561)
at android.app.Instrumentation.newActivity(Instrumentation.java:1065)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2199)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2360)
at android.app.ActivityThread.access$800(ActivityThread.java:144)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1278)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5221)
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:899)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
代碼
package com.pz.mediatonmessanger;
import android.app.ProgressDialog;
import android.content.Intent;
import android.support.design.widget.FloatingActionButton;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.ListView;
import com.pz.mediatonmessanger.Adapter.ChatDialogsAdapter;
import com.quickblox.auth.QBAuth;
import com.quickblox.auth.session.BaseService;
import com.quickblox.auth.session.QBSession;
import com.quickblox.chat.QBChatService;
import com.quickblox.chat.QBRestChatService;
import com.quickblox.chat.model.QBChatDialog;
import com.quickblox.core.QBEntityCallback;
import com.quickblox.core.exception.BaseServiceException;
import com.quickblox.core.exception.QBResponseException;
import com.quickblox.core.request.QBRequestBuilder;
import com.quickblox.core.request.QBRequestGetBuilder;
import com.quickblox.users.model.QBUser;
import java.util.ArrayList;
public class ChatDialogActivity extends AppCompatActivity {
FloatingActionButton floatingActionButton;
ListView lstChatDialogs;
public ChatDialogActivity(FloatingActionButton floatingActionButton) {
this.floatingActionButton = floatingActionButton;
}
public ChatDialogActivity(ListView lstChatDialogs) {
this.lstChatDialogs = lstChatDialogs;
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_chat_dialog);
createSessionForChat();
lstChatDialogs = (ListView)findViewById(R.id.lstChatDialogs);
loadChatDialogs();
floatingActionButton = (FloatingActionButton) findViewById(R.id.chatdialog_adduser);
floatingActionButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(ChatDialogActivity.this, ListUsersActivity.class);
startActivity(intent);
}
});
}
private void loadChatDialogs() {
QBRequestGetBuilder requestBuilder = new QBRequestGetBuilder();
requestBuilder.setLimit(100);
QBRestChatService.getChatDialogs(null,requestBuilder).performAsync(new QBEntityCallback<ArrayList<QBChatDialog>>() {
@Override
public void onSuccess(ArrayList<QBChatDialog> qbChatDialogs, Bundle bundle) {
//Kod
ChatDialogsAdapter adapter = new ChatDialogsAdapter(getBaseContext(),qbChatDialogs);
lstChatDialogs.setAdapter(adapter);
adapter.notifyDataSetChanged();
}
@Override
public void onError(QBResponseException e) {
Log.e("Błąd",e.getMessage());
}
});
}
private void createSessionForChat() {
final ProgressDialog mDialog = new ProgressDialog(ChatDialogActivity.this);
mDialog.setMessage("Ładowanie...");
mDialog.setCanceledOnTouchOutside(false);
mDialog.show();
String user,password;
user = getIntent().getStringExtra("user");
password = getIntent().getStringExtra("password");
final QBUser qbUser = new QBUser(user,password);
QBAuth.createSession(qbUser).performAsync(new QBEntityCallback<QBSession>() {
@Override
public void onSuccess(QBSession qbSession, Bundle bundle) {
qbUser.setId(qbSession.getUserId());
try {
qbUser.setPassword(BaseService.getBaseService().getToken());
} catch (BaseServiceException e) {
e.printStackTrace();
}
QBChatService.getInstance().login(qbUser, new QBEntityCallback() {
@Override
public void onSuccess(Object o, Bundle bundle) {
mDialog.dismiss();
}
@Override
public void onError(QBResponseException e) {
Log.e("Błąd",""+e.getMessage());
}
});
}
@Override
public void onError(QBResponseException e) {
}
});
}
}
你'Activity'類不應該有任何顯式的構造的。刪除你有的。 –