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Question

嗨，朋友们，请帮我，我正在用文本和图像的转换制作聊天应用程序，只要用户更改个人资料中的图像，转换时也需要更新它，但是它不会更新，但是每当我发送新消息时，新图像正在更新，我也没有设置主键

这是我没有尝试过的以下链接：

如何使用Realm Android更新Table中的值？

在Android中使用Realm更新表中的多个行

public class Chat_history extends AppCompatActivity {
    @BindView(R.id.chat_history_toolbar)
    CustomToolbar chat_history_toolbar;
    @BindView(R.id.sendmessgae)
    CustomEditText sendmessgae;
    @BindView(R.id.chat_history_list)
    ListView chat_history_list;
    Chat_history_Adapter chathisadapter;
    RealmResults<Chat_history_pojo> chathistorylist;
    Realm chatrealm;
    BroadcastReceiver chatreceiver;
    public static final String BroadCastAction = "com.parallelspace.parallelspace.Chat_history";
    RealmChangeListener chatupdatelisterner = new RealmChangeListener() {
        @Override
        public void onChange(Object element) {
            chathisadapter.addmessage(chathistorylist);
        }
    };


    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.chat_history);
        ButterKnife.bind(this);
        Realm.init(getApplicationContext());
        setSupportActionBar(chat_history_toolbar);
        assert getSupportActionBar() != null;
        **chatrealm = Realm.getDefaultInstance();
        chatrealm.beginTransaction();
        RealmQuery<Chat_history_pojo> getLoginData= chatrealm.where(Chat_history_pojo.class).beginGroup().equalTo("receiverid", getIntent().getStringExtra("rid")).endGroup();
        RealmResults<Chat_history_pojo> registrationRealm = getLoginData.findAll();
        for (Chat_history_pojo chtapojo:registrationRealm) {
            chtapojo.setReciever_profile(getIntent().getStringExtra("rimage"));
            chatrealm.copyToRealm(registrationRealm);
        }
        chatrealm.commitTransaction();**
        chathistorylist = chatrealm.where(Chat_history_pojo.class).beginGroup()
                .equalTo("senderid", Session.getUserID(getApplicationContext()))
                .equalTo("receiverid", getIntent().getStringExtra("rid"))
                .endGroup()
                .or()
                .beginGroup()
                .equalTo("receiverid", Session.getUserID(getApplicationContext()))
                .equalTo("senderid", getIntent().getStringExtra("rid"))
                .endGroup()
                .findAll();
        chathisadapter = new Chat_history_Adapter(Chat_history.this, chathistorylist);
        chat_history_list.setStackFromBottom(true);
        chat_history_list.setTranscriptMode(chat_history_list.TRANSCRIPT_MODE_NORMAL);
        chat_history_list.setAdapter(chathisadapter);
        /*chatrealm.executeTransaction(new Realm.Transaction() {
            @Override
            public void execute(Realm realm) {
                Constant.l("Realm Update Called");
                RealmResults<Chat_history_pojo> updatehispojo = chatrealm.where(Chat_history_pojo.class).equalTo("receiverid", getIntent().getStringExtra("rid")).findAll();
                for(Chat_history_pojo updatepojo:updatehispojo){
                    updatepojo.setReciever_profile(getIntent().getStringExtra("rimage"));
                    chatrealm.insertOrUpdate(updatepojo);
                    chathisadapter.notifyDataSetChanged();
                }
            }
        });*/

        sendmessgae.setDrawableClickListener(new DrawableClickListener() {
            @Override
            public void onClick(DrawablePosition target) {
                switch (target) {
                    case RIGHT:
                        if (sendmessgae.getText().toString().isEmpty()) {
                            Constant.t(getApplicationContext(), "Please Enter Message");
                        } else {
                            sendmessage();
                        }
                        break;
                    default:
                        break;
                }
            }
        });
        if (getIntent().hasExtra("mtype")) {
            chat_history_toolbar.toolbaricon(getApplicationContext(), getIntent().getStringExtra("rimage"));
            chat_history_toolbar.toolbartext(getIntent().getStringExtra("rname"));
        } else {
            chat_history_toolbar.toolbaricon(getApplicationContext(), getIntent().getStringExtra("rimage"));
            chat_history_toolbar.toolbartext(getIntent().getStringExtra("rname"));
        }
        chat_history_toolbar.Whichonclicked("back", new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Session.removepushnotification(getApplicationContext());
                Intent chathistoryintent = new Intent(getApplicationContext(), Chadim_Home.class);
                chathistoryintent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
                startActivity(chathistoryintent);
            }
        });
        chat_history_toolbar.Whichonclicked("toolbar", new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent chathisintent = new Intent(getApplicationContext(), Detailed_friend.class);
                chathisintent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
                chathisintent.putExtra("rname", getIntent().getStringExtra("rname"));
                chathisintent.putExtra("rimage", getIntent().getStringExtra("rimage"));
                chathisintent.putExtra("rid", getIntent().getStringExtra("rid"));
                startActivity(chathisintent);
            }
        });
        chat_history_toolbar.Whichonclicked("delete", new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                chatrealm.executeTransaction(new Realm.Transaction() {
                    @Override
                    public void execute(Realm realm) {
                        RealmResults<Chat_history_pojo> deleteresults = realm.where(Chat_history_pojo.class).beginGroup()
                                .equalTo("senderid", Session.getUserID(getApplicationContext()))
                                .equalTo("receiverid", getIntent().getStringExtra("rid"))
                                .endGroup()
                                .or()
                                .beginGroup()
                                .equalTo("receiverid", Session.getUserID(getApplicationContext()))
                                .equalTo("senderid", getIntent().getStringExtra("rid"))
                                .endGroup()
                                .findAll();
                        deleteresults.deleteAllFromRealm();
                    }
                });
            }
        });
        chatreceiver = new BroadcastReceiver() {
            @Override
            public void onReceive(Context context, Intent intent) {
                chatrealm = Realm.getDefaultInstance();
                chatrealm.beginTransaction();
                Chat_history_pojo chatupdatepojo = chatrealm.createObject(Chat_history_pojo.class);
                chatupdatepojo.setSenderid(getIntent().getStringExtra("rid"));
                chatupdatepojo.setReceiverid(Session.getUserID(getApplicationContext()));
                chatupdatepojo.setSender_profile(Session.getUserimage(getApplicationContext()));
                chatupdatepojo.setReciever_profile(getIntent().getStringExtra("rimage"));
                chatupdatepojo.setMessage(intent.getStringExtra("msg").replace("$", " "));
                chatupdatepojo.setType("text");
                if (intent.getStringExtra("type").equals("image")) {
                    chatupdatepojo.setType("image");
                } else if (intent.getStringExtra("type").equals("text")) {
                    chatupdatepojo.setType("text");
                }
                chatrealm.commitTransaction();
                chatrealm.close();
            }
        };
        IntentFilter intfil = new IntentFilter(BroadCastAction);
        registerReceiver(chatreceiver, intfil);

    }

    @Override
    protected void onDestroy() {
        unregisterReceiver(chatreceiver);
        super.onDestroy();

    }

    @Override
    protected void onStart() {
        super.onStart();
        chatrealm.addChangeListener(chatupdatelisterner);
        Session.pushnotification(getApplicationContext());
    }

    @Override
    protected void onStop() {
        super.onStop();
        chatrealm.removeChangeListener(chatupdatelisterner);
        Session.removepushnotification(getApplicationContext());
    }

    @OnClick(R.id.camera)
    public void camera() {
        TedBottomPicker bottomSheetDialogFragment = new TedBottomPicker.Builder(Chat_history.this)
                .setOnImageSelectedListener(new TedBottomPicker.OnImageSelectedListener() {
                    @Override
                    public void onImageSelected(Uri uri) {
                        try {
                            Bitmap sendimage = MediaStore.Images.Media.getBitmap(Chat_history.this.getContentResolver(), uri);
                            sendimages(Session.getUserID(getApplicationContext()), getIntent().getStringExtra("rid"), sendimage);
                        } catch (IOException e) {
                            Constant.l(e.toString());
                        }
                    }
                })
                .setPeekHeight(getResources().getDisplayMetrics().heightPixels / 2)
                .create();

        bottomSheetDialogFragment.show(getSupportFragmentManager());
    }

    private void sendimages(String sid, String rid, Bitmap sendbitmap) {
        Constant.showloader(Chat_history.this);
        String sendumageurl = Constant.psurl + "chatdocument&task=send&sender_id=" + sid + "&reciever_id=" + rid;
        Constant.l(sendumageurl);
        AndroidNetworking.post(sendumageurl).addBodyParameter("image", Constant.getStringImage(sendbitmap)).build().getAsJSONObject(new JSONObjectRequestListener() {
            @Override
            public void onResponse(JSONObject response) {
                try {
                    if (response.getString("status").equals("Success")) {
                        Constant.l(String.valueOf(response));
                        chatrealm = Realm.getDefaultInstance();
                        chatrealm.beginTransaction();
                        Chat_history_pojo chatupdatepojo = chatrealm.createObject(Chat_history_pojo.class);
                        chatupdatepojo.setSenderid(Session.getUserID(getApplicationContext()));
                        chatupdatepojo.setReceiverid(getIntent().getStringExtra("rid"));
                        chatupdatepojo.setSender_profile(Session.getUserimage(getApplicationContext()));
                        chatupdatepojo.setReciever_profile(getIntent().getStringExtra("rimage"));
                        chatupdatepojo.setMessage(response.getString("url"));
                        chatupdatepojo.setType("image");
                        chatrealm.commitTransaction();
                        chatrealm.close();
                    }
                } catch (JSONException e) {
                    Constant.l(e.toString());
                    Constant.dismissloader();
                }
                Constant.dismissloader();
            }

            @Override
            public void onError(ANError anError) {
                Constant.l(anError.toString());
                Constant.dismissloader();
            }
        });
    }

    @Override
    public void onBackPressed() {
        Session.removepushnotification(getApplicationContext());
        Intent chathistoryintent = new Intent(getApplicationContext(), Chadim_Home.class);
        chathistoryintent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
        startActivity(chathistoryintent);
    }

    private void sendmessage() {
        String schatsendmesg = Constant.psurl + "chat&task=send&sender_id=" + Session.getUserID(getApplicationContext()) + "&reciever_id=" + getIntent().getStringExtra("rid") + "&message=" + sendmessgae.getText().toString().replace(" ", "$");
        Constant.l(schatsendmesg);
        AndroidNetworking.get(schatsendmesg).setOkHttpClient(Constant.okClient()).build().getAsJSONObject(new JSONObjectRequestListener() {
            @Override
            public void onResponse(JSONObject response) {
                try {
                    if (response.getString("status").equals("Success")) {
                        chatrealm = Realm.getDefaultInstance();
                        chatrealm.beginTransaction();
                        Chat_history_pojo chatupdatepojo = chatrealm.createObject(Chat_history_pojo.class);
                        chatupdatepojo.setSenderid(Session.getUserID(getApplicationContext()));
                        chatupdatepojo.setReceiverid(getIntent().getStringExtra("rid"));
                        chatupdatepojo.setMessage(sendmessgae.getText().toString());
                        chatupdatepojo.setSender_profile(Session.getUserimage(getApplicationContext()));
                        chatupdatepojo.setReciever_profile(getIntent().getStringExtra("rimage"));
                        chatupdatepojo.setType("text");
                        chatrealm.commitTransaction();
                        chatrealm.close();
                        sendmessgae.setText("");
                    }
                } catch (JSONException e) {
                    Constant.l(e.toString());
                }
            }

            @Override
            public void onError(ANError anError) {
                Constant.l(anError.toString());
            }
        });
    }

    @Override
    protected void onResume() {
        super.onResume();
        Session.pushnotification(getApplicationContext());
    }

    @Override
    protected void onPause() {
        super.onPause();
        Session.removepushnotification(getApplicationContext());
    }
}

Answer 1

尝试这种更新方式。

Realm realm = Realm.getDefaultInstance();
realm.beginTransaction();

//Here i am checking the condition 
RealmQuery<RegistrationRealm> getLoginData= realm.where(RegistrationRealm.class).equalTo("id",1);

//finding the first set if matches the criteria
RegistrationRealm registrationRealm = getLoginData.findFirst();

//setting the values
registrationRealm.setFirstname(firstname);
registrationRealm.setLastname(lastname);

//Updating the same object with new values
realm.copyToRealm(registrationRealm);
//commiting the current transaction
realm.commitTransaction();

如果需要更新所有内容，请获取RealmResults对象并进行迭代

RealmResults<RegistrationRealm> registrationRealm = getLoginData.findAll();

注意：使用realm.copyToRealm() ，请务必记住，只有返回的对象由Realm管理，因此对原始对象的任何进一步更改都不会保留。

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