import android.content.Context;
import android.util.Log;

import com.tencent.imsdk.v2.V2TIMCallback;
import com.tencent.imsdk.v2.V2TIMManager;
import com.tencent.imsdk.v2.V2TIMSDKConfig;
import com.tencent.qcloud.tim.push.TIMPushCallback;
import com.tencent.qcloud.tim.push.TIMPushManager;

public void loginIMAndRegisterPush(Context context) {
    int sdkAppId = 0; // TODO: Replace with your SDKAppID.
    String userID = "<YOUR_USER_ID>";
    String userSig = "<YOUR_USER_SIG>";

    boolean initSuccess = V2TIMManager.getInstance().initSDK(context, sdkAppId, new V2TIMSDKConfig());
    if (!initSuccess) {
        Log.e("TIMPush", ">>>>> IM SDK init failed");
        return;
    }

    V2TIMManager.getInstance().login(userID, userSig, new V2TIMCallback() {
        @Override
        public void onSuccess() {
            TIMPushManager.getInstance().registerPush(context, sdkAppId, null, new TIMPushCallback<Object>() {
                @Override
                public void onSuccess(Object data) {
                    Log.d("TIMPush", ">>>>> registerPush success, data = " + data);
                    TIMPushManager.getInstance().getRegistrationID(new TIMPushCallback<Object>() {
                        @Override
                        public void onSuccess(Object data) {
                            String registrationID = (String) data;
                            Log.d(TAG, ">>>>> getRegistrationID success, registrationID = " + registrationID);
                        }
                        @Override
                        public void onError(int errCode, String errMsg, Object data) {
                            Log.e(TAG, ">>>>> getRegistrationID failed, errCode = " + errCode
                                    + ", errMsg = " + errMsg);
                        }
                    });
                }

                @Override
                public void onError(int errCode, String errMsg, Object data) {
                    Log.e("TIMPush", ">>>>> registerPush failed, errCode = " + errCode
                            + ", errMsg = " + errMsg);
                }
            });
        }

        @Override
        public void onError(int code, String desc) {
            Log.e("TIMPush", ">>>>> IM login failed, code = " + code + ", desc = " + desc);
        }
    });
}

import android.util.Log;

import com.tencent.imsdk.v2.V2TIMManager;
import com.tencent.imsdk.v2.V2TIMMessage;
import com.tencent.imsdk.v2.V2TIMOfflinePushInfo;
import com.tencent.imsdk.v2.V2TIMSendCallback;

V2TIMOfflinePushInfo pushInfo = new V2TIMOfflinePushInfo();
pushInfo.setTitle("Push title");
pushInfo.setDesc("Push content");
// TODO: ext is business-defined. Replace with your target page, conversation ID, and other parameters as needed.
String ext = "{\\"conversationID\\":\\"user_A\\",\\"conversationType\\":1}";
pushInfo.setExt(ext.getBytes());

V2TIMMessage message = V2TIMManager.getMessageManager().createTextMessage("Hello TIMPush");
V2TIMManager.getMessageManager().sendMessage(
        message,
        "<TARGET_USER_ID>", // For one-to-one chat, pass the peer userID; for group chat, pass null
        null,               // For group chat, pass groupID; for one-to-one chat, pass null
        V2TIMMessage.V2TIM_PRIORITY_DEFAULT,
        false,
        pushInfo,
        new V2TIMSendCallback<V2TIMMessage>() {
            @Override
            public void onProgress(int progress) {}

            @Override
            public void onSuccess(V2TIMMessage msg) {
                Log.d("TIMPush", ">>>>> sendMessage success, msgID = " + msg.getMsgID());
            }

            @Override
            public void onError(int code, String desc) {
                Log.e("TIMPush", ">>>>> sendMessage failed, code = " + code + ", desc = " + desc);
            }
        });